Riverside City Council
September 17, 2024

DELISTED CLEANUP

DELISTED COUNTY

INDIAN LUST

INDIAN UST

DELISTED INDIAN LST

DELISTED INDIAN UST

LOP RIVERSIDE

UST RIVERSIDE
231 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Facility Registry Service/Facility Index: rr-FINDS/FRS-bb The Facility Registry Service (FRS) is a centrally managed database that identifies facilities, sites, or places subject to environmental regulations or of environmental interest. FRS creates high-quality, accurate, and authoritative facility identification records through rigorous verification and management procedures that incorporate information from program national systems, state master facility records, and data collected from EPA's Central Data Exchange registrations and data management personnel. This list is made available by the Environmental Protection Agency (US EPA).

Government Publication Date: Nov 2, 2020
Toxics Release Inventory (TRI) Program: rr-TRIS-bb
The EPA's Toxics Release Inventory (TRI) is a database containing data on disposal or other releases of over 650 toxic chemicals from thousands of U.

S. facilities and information about how facilities manage those chemicals through recycling, energy recovery, and treatment. One of TRI's primary purposes is to inform communities about toxic chemical releases to the environment.

Government Publication Date: Aug 24, 2021
Perfluorinated Alkyl Substances (PFAS) Releases: rr-PFAS TRI-bb List of Toxics Release Inventory (TRI) facilities at which the reported chemical is a Per- or polyfluorinated alkyl substance (PFAS) included in the Environmental Protection Agency (EPA)'s consolidated PFAS Master List of PFAS Substances. The EPA's Toxics Release Inventory (TRI) is a database containing data on disposal or other releases of over 650 toxic chemicals from thousands of U.S. facilities and information about how facilities manage those chemicals through recycling, energy recovery, and treatment.

Government Publication Date: Aug 24, 2021
PFOA/PFOS Contaminated Sites: rr-PFAS NPL-bb
List of National Priorities List (NPL) and related Superfund Alternative Agreement (SAA) sites where PFOA or PFOS contaminants have been found in water and/or soil. The site listing is provided by the Federal Environmental Protection Agency (EPA).

Government Publication Date: Oct 4, 2022
Perfluorinated Alkyl Substances (PFAS) Water Quality: rr-PFAS WATER-bb The Water Quality Portal (WQP) is a cooperative service sponsored by the United States Geological Survey (USGS), the Environmental Protection Agency (EPA), and the National Water Quality Monitoring Council (NWQMC). This listing includes records from the Water Quality Portal where the characteristic (environmental measurement) is in the Environmental Protection Agency (EPA)'s consolidated PFAS Master List of PFAS Substances.

Government Publication Date: Jul 20, 2020
SSEHRI PFAS Contamination Sites: rr-PFAS SSEHRI-bb
This PFAS Contamination Site Tracker database is compiled by the Social Science Environmental Health Research Institute (SSEHRI) at Northeastern University. According to the SSEHRI, the database records qualitative and quantitative data from each known site of PFAS contamination, including timeline of discovery, sources, levels, health impacts, community response, and government response. The goal of this database is to compile information and support public understanding of the rapidly unfolding issue of PFAS contamination. All data presented was extracted from government websites, news articles, or publicly available documents, and this is cited in the tracker. Disclaimer: The source conveys this database undergoes regular updates as new information becomes available, some sites may be missing and/or contain information that is incorrect or outdated, as well as their information represents all contamination sites SSEHRI is aware of, not all possible contamination sites. This data is not intended to be used for legal purposes. Limited location details are available with this data. Access the following for the most current informations https://pfasproject.com/pfascontamination-site-tr acker/ Government Publication Date: Dec 12, 2019
National Response Center PFAS Spills: rr-ERNS PFAS-bb
National Response Center (NRC) calls from 1990 to the most recent complete calendar year where there is indication of Aqueous Film Forming Foam (AFFF) usage. NRC calls may reference AFFF usage in the "Material Involved" or "Incident Description" fields. Data made available by the US Environmental Protection Agency (EPA). Disclaimer: dataset may include initial or misidentified incident data not yet validated or investigated by a federal/state response agency.

Government Publication Date: Feb 23, 2022
Hazardous Materials Information Reporting System: rr-HMIRS-bb US DOT - Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA) Incidents Reports Database taken from Hazmat Intelligence Portal, U.S. Department of Transportation.

Government Publication Date: Sep 1, 2020
National Clandestine Drug Labs: rr-NCDL-bb

FINDS/FRS
TRIS

PFAS TRI

PFAS NPL

PFAS WATER

PFAS SSEHRI

ERNS PFAS
HMIRS
NCDL
232 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 The U.S. Department of Justice ("the Department"), Drug Enforcement Administration (DEA), provides this data as a public service. It contains addresses of some locations where law enforcement agencies reported they found chemicals or other items that indicated the presence of either clandestine drug laboratories or dumpsites. In most cases, the source of the entries is not the Department, and the Department has not verified the entry and does not guarantee its accuracy.

Government Publication Date: Aug 30, 2022
Toxic Substances Control Act: rr-TSCA-bb
The Environmental Protection Agency (EPA) is amending the Toxic Substances Control Act (TSCA) section 8(a) Inventory Update Reporting (IUR) rule and changing its name to the Chemical Data Reporting (CDR) rule.

The CDR enables EPA to collect and publish information on the manufacturing, processing, and use of commercial chemical substances and mixtures (referred to hereafter as chemical substances) on the TSCA Chemical Substance Inventory (TSCA Inventory). This includes current information on chemical substance production volumes, manufacturing sites, and how the chemical substances are used. This information helps the Agency determine whether people or the environment are potentially exposed to reported chemical substances. EPA publishes submitted CDR data that is not Confidential Business Information (CBI).

Government Publication Date: Apr 11, 2019
Hist TSCA: rr-HIST TSCA-bb
The Environmental Protection Agency (EPA) is amending the Toxic Substances Control Act (TSCA) section 8(a) Inventory Update Reporting (IUR) rule and changing its name to the Chemical Data Reporting (CDR) rule.

The 2006 IUR data summary report includes information about chemicals manufactured or imported in quantities of 25,000 pounds or more at a single site during calendar year 2005. In addition to the basic manufacturing information collected in previous reporting cycles, the 2006 cycle is the first time EPA collected information to characterize exposure during manufacturing, processing and use of organic chemicals. The 2006 cycle also is the first time manufacturers of inorganic chemicals were required to report basic manufacturing information.

Government Publication Date: Dec 31, 2006
FTTS Administrative Case Listing: rr-FTTS ADMIN-bb
An administrative case listing from the Federal Insecticide, Fungicide, & Rodenticide Act (FIFRA) and Toxic Substances Control Act (TSCA), together known as FTTS. This database was obtained from the Environmental Protection Agency's (EPA) National Compliance Database (NCDB). The FTTS and NCDB was shut down in 2006.

Government Publication Date: Jan 19, 2007
FTTS Inspection Case Listing: rr-FTTS INSP-bb
An inspection case listing from the Federal Insecticide, Fungicide, & Rodenticide Act (FIFRA) and Toxic Substances Control Act (TSCA), together known as FTTS. This database was obtained from the Environmental Protection Agency's (EPA) National Compliance Database (NCDB). The FTTS and NCDB was shut down in 2006.

Government Publication Date: Jan 19, 2007
Potentially Responsible Parties List: rr-PRP-bb
Early in the site cleanup process, the U.S. Environmental Protection Agency (EPA) conducts a search to find the Potentially Responsible Parties (PRPs). The EPA looks for evidence to determine liability by matching wastes found at the site with parties that may have contributed wastes to the site.

This listing contains PRPs, Noticed Parties, at sites in the EPA's Superfund Enterprise Management System (SEMS).

Government Publication Date: Nov 23, 2022
State Coalition for Remediation of Drycleaners Listing: rr-SCRD DRYCLEANER-bb The State Coalition for Remediation of Drycleaners (SCRD) was established in 1998, with support from the U.S. Environmental Protection Agency (EPA) Office of Superfund Remediation and Technology Innovation. Coalition members are states with mandated programs and funding for drycleaner site remediation. Current members are Alabama, Connecticut, Florida, Illinois, Kansas, Minnesota, Missouri, North Carolina, Oregon, South Carolina, Tennessee, Texas, and Wisconsin. Since 2017, the SCRD no longer maintains this data, refer to applicable state source data where available.

Government Publication Date: Nov 08, 2017
Integrated Compliance Information System (ICIS): rr-ICIS-bb The U.S. Environmental Protection Agency's Enforcement and Compliance History Online system incorporates data from the Integrated Compliance Information System - National Pollutant Discharge Elimination System (ICIS-NPDES). ICIS-NPDES is an information management system maintained by the Office of Compliance to track permit compliance and enforcement status of facilities regulated by the NPDES under the Clean Water Act. This data includes permit, inspection, violation and enforcement action information for applicable ICIS records.

Government Publication Date: Oct 15, 2022
Drycleaner Facilities: rr-FED DRYCLEANERS-bb
TSCA

HIST TSCA

FTTS ADMIN

FTTS INSP
PRP

SCRD DRYCLEANER
ICIS

FED DRYCLEANERS
233 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 A list of drycleaner facilities from Enforcement and Compliance History Online (ECHO) online search. The Environmental Protection Agency (EPA) tracks facilities that possess NAIC and SIC codes that classify businesses as drycleaner establishments.

Government Publication Date: Jun 25, 2022
Delisted Drycleaner Facilities: rr-DELISTED FED DRY-bb
List of sites removed from the list of Drycleaner Facilities (sites in the EPA's Integrated Compliance Information System (ICIS) with NAIC or SIC codes identifying the business as a drycleaner establishment).

Government Publication Date: Jun 25, 2022
Formerly Used Defense Sites: rr-FUDS-bb
Formerly Used Defense Sites (FUDS) are properties that were formerly owned by, leased to, or otherwise possessed by and under the jurisdiction of the Secretary of Defense prior to October 1986, where the Department of Defense (DOD) is responsible for an environmental restoration. The FUDS Annual Report to Congress (ARC) is published by the U.S. Army Corps of Engineers (USACE). This data is compiled from the USACE's Geospatial FUDS data layers and Homeland Infrastructure Foundation-Level Data (HIFLD) FUDS dataset.

Government Publication Date: Jul 12, 2022
Former Military Nike Missile Sites: rr-FORMER NIKE-bb
This information was taken from report DRXTH-AS-IA-83A016 (Historical Overview of the Nike Missile System, 12/1984) which was performed by Environmental Science and Engineering, Inc. for the U.S. Army Toxic and Hazardous Materials Agency Assessment Division. The Nike system was deployed between 1954 and the mid-1970's. Among the substances used or stored on Nike sites were liquid missile fuel (JP-4); starter fluids (UDKH, aniline, and furfuryl alcohol); oxidizer (IRFNA); hydrocarbons (motor oil, hydraulic fluid, diesel fuel, gasoline, heating oil); solvents (carbon tetrachloride, trichloroethylene, trichloroethane, stoddard solvent); and battery electrolyte. The quantities of material a disposed of and procedures for disposal are not documented in published reports. Virtually all information concerning the potential for contamination at Nike sites is confined to personnel who were assigned to Nike sites. During deactivation most hardware was shipped to depot-level supply points. There were reportedly instances where excess materials were disposed of on or near the site itself at closure. There was reportedly no routine site decontamination.

Government Publication Date: Dec 2, 1984
PHMSA Pipeline Safety Flagged Incidents: rr-PIPELINE INCIDENT-bb A list of flagged pipeline incidents made available by the U.S. Department of Transportation (US DOT) Pipeline and Hazardous Materials Safety Administration (PHMSA). PHMSA regulations require incident and accident reports for five different pipeline system types.

Government Publication Date: Mar 31, 2021
Material Licensing Tracking System (MLTS): rr-MLTS-bb
A list of sites that store radioactive material subject to the Nuclear Regulatory Commission (NRC) licensing requirements. This list is maintained by the NRC. As of September 2016, the NRC no longer releases location information for sites. Site locations were last received in July 2016.

Government Publication Date: May 11, 2021
Historic Material Licensing Tracking System (MLTS) sites: rr-HIST MLTS-bb A historic list of sites that have inactive licenses and/or removed from the Material Licensing Tracking System (MLTS). In some cases, a site is removed from the MLTS when the state becomes an "Agreement State". An Agreement State is a State that has signed an agreement with the Nuclear Regulatory Commission (NRC) authorizing the State to regulate certain uses of radioactive materials within the State.

Government Publication Date: Jan 31, 2010
Mines Master Index File: rr-MINES-bb
The Master Index File (MIF) is provided by the United State Department of Labor, Mine Safety and Health Administration (MSHA). This file, which was originally created in the 1970's, contained many Mine-IDs that were invalid. MSHA removes invalid IDs from the MIF upon discovery. MSHA applicable data includes the following: all Coal and Metal/Non-Metal mines under MSHA's jurisdiction since 1/1/1970; mine addresses for all mines in the database except for Abandoned mines prior to 1998 from MSHA's legacy system (addresses may or may not correspond with the physical location of the mine itself); violations that have been assessed penalties as a result of MSHA inspections beginning on 1/1/2000; and violations issued as a result of MSHA inspections conducted beginning on 1/1/2000.

Government Publication Date: Aug 3, 2022
Surface Mining Control and Reclamation Act Sites: rr-SMCRA-bb An inventory of land and water impacted by past mining (primarily coal mining) is maintained by the Office of Surface Mining Reclamation and Enforcement (OSMRE) to provide information needed to implement the Surface Mining Control and Reclamation Act of 1977 (SMCRA). The inventory contains information on the location, type, and extent of Abandoned Mine Land (AML) impacts, as well as information on the cost associated with the reclamation of those problems. The inventory is based upon field surveys by State, Tribal, and OSMRE program officials. It is dynamic to the extent that it is modified as new problems are identified and existing problems are reclaimed.

Government Publication Date: Aug 18, 2022

DELISTED FED DRY
FUDS

FORMER NIKE

PIPELINE INCIDENT
MLTS

HIST MLTS
MINES
SMCRA
234 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Mineral Resource Data System: rr-MRDS-bb
The Mineral Resource Data System (MRDS) is a collection of reports describing metallic and nonmetallic mineral resources throughout the world.

Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and references. This database contains the records previously provided in the Mineral Resource Data System (MRDS) of USGS and the Mineral Availability System/Mineral Industry Locator System (MAS/MILS) originated in the U.S. Bureau of Mines, which is now part of USGS. The USGS has ceased systematic updates of the MRDS database with their focus more recently on deposits of critical minerals while providing a well-documented baseline of historical mine locations from USGS topographic maps.

Government Publication Date: Mar 15, 2016
DOE Legacy Management Sites: rr-LM SITES-bb
The U.S. Department of Energy (DOE) Office of Legacy Management (LM) currently manages radioactive and chemical waste, environmental contamination, and hazardous material at over 100 sites across the U.S. The LM manages sites with diverse regulatory drivers (statutes or programs that direct cleanup and management requirements at DOE sites) or as part of internal DOE or congressionally-recognized programs, such as but not limited to: Formerly Utilized Sites Remedial Action Program (FUSRAP), Uranium Mill Tailings Radiation Control Act (UMTRCA Title I, Tile II), Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Resource Conservation and Recovery Act (RCRA), Decontamination and Decommissioning (D&D), Nuclear Waste Policy Act (NWPA). This site listing includes data exported from the DOE Office of LM' s Geospatial Environmental Mapping System (GEMS). GEMS Data disclaimer: The DOE Office of LM makes no representation or warranty, expressed or implied, regarding the use, accuracy, availability, or completeness of the data presented herein.

Government Publication Date: Dec 1, 2022
Alternative Fueling Stations: rr-ALT FUELS-bb
This list of alternative fueling stations is sourced from the Alternative Fuels Data Center (AFDC). The U.S. Department of Energy's Office of Energy Efficiency & Renewable Energy launched the AFDC in 1991 as a repository for alternative fuel vehicle performance data, which provides a wealth of information and data on alternative and renewable fuels, advanced vehicles, fuel-saving strategies, and emerging transportation technologies. The data includes Biodiesel (B20 and above), Compressed Natural Gas (CNG), Electric, Ethanol (E85), Hydrogen, Liquefied Natural Gas (LNG), Propane (LPG) fuel type locations.

Government Publication Date: Jan 3, 2023
Superfunds Consent Decrees: rr-CONSENT DECREES-bb
This list of Superfund consent decrees is provided by the Department of Justice, Environment & Natural Resources Division (ENRD) through a Freedom of Information Act (FOIA) applicable file. This listing includes Consent Decrees for CERCLA or Superfund Sites filed and/or as proposed within the ENRD's Case Management System (CMS) since 2010. CMS may not reflect the latest developments in a case nor can the agency guarantee the accuracy of the data. ENRD Disclaimer: Congress excluded three discrete categories of law enforcement and national security records from the requirements of the FOIA; response is limited to those records that are subject to the requirements of the FOIA; however, this should not be taken as an indication that excluded records do, or do not, exist.

Government Publication Date: Jan 11, 2023
Air Facility System: rr-AFS-bb
This EPA retired Air Facility System (AFS) dataset contains emissions, compliance, and enforcement data on stationary sources of air pollution.

Regulated sources cover a wide spectrum; from large industrial facilities to relatively small operations such as dry cleaners. AFS does not contain data on facilities that are solely asbestos demolition and/or renovation contractors, or landfills. ECHO Clean Air Act data from AFS are frozen and reflect data as of October 17, 2014; the EPA retired this system for Clean Air Act stationary sources and transitioned to ICIS-Air.

Government Publication Date: Oct 17, 2014
Registered Pesticide Establishments: rr-SSTS-bb
List of active EPA-registered foreign and domestic pesticide-producing and device-producing establishments based on data from the Section Seven Tracking System (SSTS). The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 7 requires that facilities producing pesticides, active ingredients, or devices be registered. The list of establishments is made available by the EPA.

Government Publication Date: Mar 30, 2022
Polychlorinated Biphenyl (PCB) Transformers: rr-PCBT-bb Locations of Transformers Containing Polychlorinated Biphenyls (PCBs) registered with the United States Environmental Protection Agency. PCB transformer owners must register their transformer(s) with EPA. Although not required, PCB transformer owners who have removed and properly disposed of a registered PCB transformer may notify EPA to have their PCB transformer de-registered. Data made available by EPA.

Government Publication Date: Oct 15, 2019
Polychlorinated Biphenyl (PCB) Notifiers: rr-PCB-bb
MRDS

LM SITES

ALT FUELS

CONSENT DECREES
AFS
SSTS
PCBT
PCB
235 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Facilities included in the national list of facilities that have notified the United States Environmental Protection Agency (EPA) of Polychlorinated Biphenyl (PCB) activities. Any company or person storing, transporting or disposing of PCBs or conducting PCB research and development must notify the EPA and receive an identification number.

Government Publication Date: Jul 28, 2022
State
Dry Cleaning Facilities: rr-DRYCLEANERS-bb
A list of drycleaner related facilities that have EPA ID numbers. These are facilities with certain SIC codes: power laundries, family and commercial, linen supply, commercial laundry, dry cleaning and pressing machines - Coin Operated Laundry and Dry Cleaning. This is provided by the Department of Toxic Substance Control.

Government Publication Date: Dec 20, 2021
Delisted Drycleaners: rr-DELISTED DRYCLEANERS-bb
Sites removed from the list of drycleaner related facilities that have EPA ID numbers, made available by the California Department of Toxic Substance Control.

Government Publication Date: Jan 31, 2022
Non-Toxic Dry Cleaning Incentive Program: rr-DRYC GRANT-bb A list of grant recipients of the Non-Toxic Dry Cleaning Incentive Program made available by the California Air Resources Board (CARB). The program provides grants to eligible dry cleaning businesses to assist them in transitioning away from PERC machines to alternative non-toxic and non-smog forming technologies.

Government Publication Date: Jan 31, 2022
Per- and Polyfluoroalkyl Substances (PFAS): rr-PFAS-bb
List of FAA Part 139 Airports, Selected Landfills, and Chrome Plating Facilities from California Water Boards PFAS Investigations, as well as sites from the State Water Resources Control Board (SWRCB)'s GeoTracker at which one or more of the potential contaminants of concern are in the PFAS Master List of PFAS Substances made available by the Environmental Protection Agency (US EPA).

Government Publication Date: Feb 15, 2022
PFOA/PFOS Groundwater: rr-PFAS GW-bb
A list of water wells from the Groundwater Ambient Monitoring and Assessment Program (GAMA) Groundwater Information System with the groundwater chemical perfluorooctanoic acid (PFOA) (NL = 0.014 UG/L) or perfluorooctanoic sulfonate (PFOS) (NL = 0.013 UG/L). The GAMA Groundwater Information System search is made available by California Water Boards.

Government Publication Date: Nov 11, 2022
Hazardous Waste and Substances Site List - Site Cleanup: rr-HWSS CLEANUP-bb The Hazardous Waste and Substances Sites (Cortese) List is a planning document used by the State, local agencies and developers to comply with the California Environmental Quality Act requirements in providing information about the location of hazardous materials release sites. This list is published by California Department of Toxic Substance Control.

Government Publication Date: May 20, 2021
Toxic Pit Cleanup Act Sites: rr-TOXIC PITS-bb
The Toxic Pits Cleanup Act (TPCA) list identifies sites suspected of containing hazardous substances where cleanup has not yet been completed. This list was maintained by the State Water Resources Control Board (SWRCB), is not longer maintained, and updates are not planned.

Government Publication Date: Jul 1, 1995
List of Hazardous Waste Facilities Subject to Corrective Action: rr-DTSC HWF-bb This is a list of hazardous waste facilities identified in Health and Safety Code (HSC) § 25187.5. These facilities are those where Department of Toxic Substances Control (DTSC) has taken or contracted for corrective action because a facility owner/operator has failed to comply with a date for taking corrective action in an order issued under HSC § 25187, or because DTSC determined that immediate corrective action was necessary to abate an imminent or substantial endangerment.

Government Publication Date: Jul 18, 2016
EnviroStor Inspection, Compliance, and Enforcement: rr-INSP COMP ENF-bb A list of permitted facilities with inspections and enforcements tracked by the California Department of Toxic Substance Control's (DTSC) EnviroStor data management system.

DRYCLEANERS

DELISTED DRYCLEANERS

DRYC GRANT
PFAS

PFAS GW

HWSS CLEANUP

TOXIC PITS

DTSC HWF

INSP COMP ENF
236 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Government Publication Date: Oct 24, 2022
School Property Evaluation Program Sites: rr-SCH-bb
A list of sites registered with The Department of Toxic Substances Control (DTSC) School Property Evaluation and Cleanup (SPEC) Division. SPEC is responsible for assessing, investigating and cleaning up proposed school sites. The Division ensures that selected properties are free of contamination or, if the properties were previously contaminated, that they have been cleaned up to a level that protects the students and staff who will occupy the new school.

Government Publication Date: Oct 17, 2022
California Hazardous Material Incident Report System (CHMIRS): rr-CHMIRS-bb A list of reported hazardous material incidents, spills, and releases from the California Hazardous Material Incident Report System (CHMIRS). This list has been made available by the California Office of Emergency Services (OES).

Government Publication Date: Aug 15, 2022
Historical California Hazardous Material Incident Report System (CHMIRS): rr-HIST CHMIRS-bb A list of reported hazardous material incidents, spills, and releases from the California Hazardous Material Incident Report System (CHMIRS) prior to 1993. This list has been made available by the California Office of Emergency Services (OES).

Government Publication Date: Jan 1, 1993
Handlers from Hazardous Waste Manifest Data: rr-HAZNET-bb A list of handlers not otherwise classified as Treatment, Storage, Disposal facilities (TSDF) or generators from the facilities and manifests data made available by the California Department of Toxic Substances Control (DTSC) in their Hazardous Waste Tracking System (HWTS).

Government Publication Date: Oct 24, 2016
Generators from Hazardous Waste Manifest Data: rr-HAZ GEN-bb List of handlers listed as having generated waste from the facilities and manifests data made available by the California Department of Toxic Substances Control (DTSC) in their Hazardous Waste Tracking System (HWTS).

Government Publication Date: Dec 31, 2017
TSDF from Hazardous Waste Manifest Data: rr-HAZ TSD-bb
List of Treatment, Storage, and Disposal Facilities (TSDFs) from the facilities and manifests data made available by the California Department of Toxic Substances Control (DTSC) in their Hazardous Waste Tracking System (HWTS).

Government Publication Date: Dec 31, 2017
Historical Hazardous Waste Manifest Data: rr-HIST MANIFEST-bb A list of historic hazardous waste manifests received by the Department of Toxic Substances Control (DTSC) from year the 1980 to 1992. The volume of manifests is typically 900,000 - 1,000,000 annually, representing approximately 450,000 - 500,000 shipments.

Government Publication Date: Dec 31, 1992
DTSC Registered Hazardous Waste Transporters: rr-HW TRANSPORT-bb The California Department of Toxic Substances Control (DTSC) maintains this list of Registered Hazardous Waste Transporters.

Government Publication Date: Dec 9, 2022
Registered Waste Tire Haulers: rr-WASTE TIRE-bb
This list of registered waste tire haulers is maintained by the California Department of Resources Recycling and Recovery.

Government Publication Date: Oct 11, 2022
California Medical Waste Management Program Facility List: rr-MEDICAL WASTE-bb This list of Medical Waste Management Program Facilities is maintained by the California Department of Public Health. The Medical Waste Management Program (MWMP) regulates the generation, handling, storage, treatment, and disposal of medical waste by providing oversight for the implementation of the Medical Waste Management Act (MWMA). The MWMP permits and inspects all medical waste off-site treatment facilities, medical waste transporters, and medical waste transfer stations. This list contains transporters, treatment, and transfer facilities.

Government Publication Date: Oct 31, 2022
Historical Cortese List: rr-HIST CORTESE-bb
List of sites which were once included on the Cortese list. The Hazardous Waste and Substances Sites (Cortese) List is a planning document used by the State, local agencies and developers to comply with the California Environmental Quality Act requirements for providing information about the location of hazardous sites.

SCH
CHMIRS

HIST CHMIRS
HAZNET

HAZ GEN

HAZ TSD

HIST MANIFEST

HW TRANSPORT

WASTE TIRE

MEDICAL WASTE

HIST CORTESE
237 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Government Publication Date: Nov 13, 2008
Cease and Desist Orders and Cleanup and Abatement Orders: rr-CDO/CAO-bb The California Environment Protection Agency "Cortese List" of active Cease and Desist Orders (CDO) and Cleanup and Abatement Orders (CAO). This list contains many CDOs and CAOs that do NOT concern the discharge of wastes that are hazardous materials. Many of the listed orders concern, as examples, discharges of domestic sewage, food processing wastes, or sediment that do not contain hazardous materials, but the Water Boards' database does not distinguish between these types of orders.

Government Publication Date: Dec 6, 2021
California Environmental Reporting System (CERS) Hazardous Waste Sites: rr-CERS HAZ-bb List of sites in the California Environmental Protection Agency (CalEPA) Regulated Site Portal which fall under the following regulatory programs:

Hazardous Chemical Management, Hazardous Waste Onsite Treatment, Household Hazardous Waste Collection, Hazardous Waste Generator, RCRA LQ HW Generator. The CalEPA oversees the statewide implementation of the Unified Program which applies regulatory standards to protect Californians from hazardous waste and materials.

Government Publication Date: Oct 7, 2022
Delisted Environmental Reporting System (CERS) Hazardous Waste Sites: rr-DELISTED HAZ-bb This database contains a list of sites that were removed from the California Environmental Protection Agency (CalEPA) in the following regulatory programs: Hazardous Chemical Management, Hazardous Waste Onsite Treatment, Household Hazardous Waste Collection, Hazardous Waste Generator, RCRA LQ HW Generator.

Government Publication Date: Nov 29, 2018
Sites in GeoTracker: rr-GEOTRACKER-bb
GeoTracker is the State Water Resource Control Boards' data management system for sites that impact, or have the potential to impact, water quality in California, with emphasis on groundwater. This is a list of sites in GeoTracker that aren't otherwise categorized as LUST, Land Disposal Sites (LDS), Cleanup Sites, or sites having Waste Discharge Requirements (WDR). This listing includes program types such as Underground Injection Control (UIC), Confined Animal Facilities (CAF), Irrigated Lands Regulatory Program, plans, and non-case information.

Government Publication Date: Nov 16, 2022
Mines Listing: rr-MINE-bb
This list includes mine site locations extracted from the Mines Online database, maintained by the California Department of Conservation. Mines Online (MOL) is an interactive web map designed with GIS features that provide information such as the mine name, mine status, commodity sold, location, and other mine specific data. Please note: Mine location information is provided to assist experts in determining the location of mine operators in accordance with California Civil Code section 1103.4 and reflects information reported by mine operators in annual reports provided under Public Resources Code section 2207. While the Division of Mine Reclamation (DMR) attempts to populate MOL with accurate location information, the DMR cannot guarantee the accuracy of operator reported location information.

Government Publication Date: Jun 23, 2022
Recorded Environmental Cleanup Liens: rr-LIEN-bb
The California Department of Toxic Substance Control (DTSC) maintains this list of liens placed upon real properties. A lien is utilized by the DTSC to obtain reimbursement from responsible parties for costs associated with the remediation of contaminated properties.

Government Publication Date: Aug 3, 2022
Waste Discharge Requirements: rr-WASTE DISCHG-bb
List of sites in California State Water Resources Control Board (SWRCB) Waste Discharge Requirements (WDRs) Program in California, made available by the SWRCB via GeoTracker. The WDR program regulates point discharges that are exempt pursuant to Subsection 20090 of Title 27 and not subject to the Federal Water Pollution Control Act. The scope of the WDRs Program also includes the discharge of wastes classified as inert, pursuant to section 20230 of Title 27.

Government Publication Date: Nov 16, 2022
Toxic Pollutant Emissions Facilities: rr-EMISSIONS-bb
A list of criteria and toxic pollutant emissions data for facilities in California made available by the California Environmental Protection Agency - Air Resources Board (ARB). Risk data may be based on previous inventory submittals. The toxics data are submitted to the ARB by the local air districts as requirement of the Air Toxics "Hot Spots" Program. This program requires emission inventory updates every four years.

Government Publication Date: Dec 31, 2020
Clandestine Drug Lab Sites: rr-CDL-bb
The Department of Toxic Substances Control (DTSC) maintains a listing of drug lab sites. DTSC is responsible for removal and disposal of hazardous substances discovered by law enforcement officials while investigating illegal/clandestine drug laboratories.

CDO/CAO

CERS HAZ

DELISTED HAZ

GEOTRACKER
MINE
LIEN

WASTE DISCHG

EMISSIONS
CDL
238 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 Government Publication Date: Jan 19, 2021
Tribal
No Tribal additional environmental record sources available for this State.

County
Riverside County - Hazardous Waste Generator Sites List: rr-HWG RIVERSIDE-bb A list of Hazardous Waste Generator Sites in the County of Riverside. This list is made available by Riverside County Department of Environmental Health which has been designated as the CUPA for the County.

Government Publication Date: Jan 31, 2023
Riverside County - Disclosure Facility List: rr-HZH RIVERSIDE-bb A list of facilities disclosed to Riverside County Department of Environmental Health (DEH). This list is made available by Riverside County DEH which has been designated as the CUPA for the County. A business is required to establish and submit a Business Plan if the facility handles hazardous material equal to or greater than 55 gallons, 500 pounds or 200 cubic feet at any time during the year.

Government Publication Date: Jan 31, 2023
Riverside County - Medical Waste Facilities: rr-MED WST RIVERSIDE-bb This list of active and inactive medical waste facilities is maintained by the County of Riverside Department of Environmental Health.

Government Publication Date: Jan 12, 2023
Riverside County - California Accidental Release Prevention Program Sites: rr-RMP RIVERSIDE-bb This list of Riverside County California Accidental Release Prevention Program sites is maintained by the County of Riverside Department of Environmental Health. AB 3777 was enacted in 1986 to minimize potential emergencies involving acutely hazardous materials by requiring facilities which handle these materials to submit Risk Management Prevention Plans. The Riverside County Department of Environmental Health Hazardous Materials Branch began implementation of this Program County-wide in January 1991. All cities within Riverside County are included in this list.

Government Publication Date: Jan 31, 2023

HWG RIVERSIDE

HZH RIVERSIDE

MED WST RIVERSIDE

RMP RIVERSIDE
239 erisinfo.com | Environmental Risk Information Services Order No: 23021100028 h-Definitions
Database Descriptions: This section provides a detailed explanation for each database including: source, information available, time coverage, and acronyms used. They are listed in alphabetic order.

Detail Report: This is the section of the report which provides the most detail for each individual record. Records are summarized by location, starting with the project property followed by records in closest proximity.

Distance: The distance value is the distance between plotted points, not necessarily the distance between the sites' boundaries. All values are an approximation.

Direction: The direction value is the compass direction of the site in respect to the project property and/or center point of the report.

Elevation: The elevation value is taken from the location at which the records for the site address have been plotted. All values are an approximation.

Source: Google Elevation API.

Executive Summary: This portion of the report is divided into 3 sections:
'Report Summary'- Displays a chart indicating how many records fall on the project property and, within the report search radii. 'Site Report Summary'-Project Property'- This section lists all the records which fall on the project property. For more details, see the 'Detail Report' section.
'Site Report Summary-Surrounding Properties'- This section summarizes all records on adjacent properties, listing them in order of proximity from the project property. For more details, see the 'Detail Report' section.

Map Key: The map key number is assigned according to closest proximity from the project property. Map Key numbers always start at #1. The project property will always have a map key of '1' if records are available. If there is a number in brackets beside the main number, this will indicate the number of records on that specific property. If there is no number in brackets, there is only one record for that property.

The symbol and colour used indicates 'elevation': the red inverted triangle will dictate 'ERIS Sites with Lower Elevation', the yellow triangle will dictate 'ERIS Sites with Higher Elevation' and the orange square will dictate 'ERIS Sites with Same Elevation.' Unplottables: These are records that could not be mapped due to various reasons, including limited geographic information. These records may or may not be in your study area, and are included as reference.

Definitions
WEIS-C
Work Plan
Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

1938 Kellogg Avenue, Suite 116, Carlsbad, CA 92008
(760) 585-7070
www.weisenviro.com
October 3, 2022
Mr. Miguel Oviedo
Santa Ana Regional Water Quality Control Board
3737 Main Street, Suite 500
Riverside, CA 92501
Subject: Work Plan For Subsurface Assessment
Former Sears Retail
5261 Arlington Avenue
Riverside, California 92504
Global ID T10000018601
Dear Mr. Oviedo:

On behalf of the Foulger-Pratt, Weis Environmental has prepared this Work Plan For Subsurface Assessment pertaining to the property identified as Former Sears Retail and located at 5261 Arlington Avenue, in the City of Riverside, California (Site). The Site is a reported 17.43 acres and is further identified by County of Riverside Assessor’s Parcel Number 226-180-015. Current Site improvements include a vacant single-story former department store structure with a basement level and a singlestory former automotive repair center with a partial basement level. Asphalt paved parking areas with minor landscaping are present surrounding both buildings and throughout the remainder of the Site.

The Site is bound to the north by commercial and residential properties, to the south by Arlington Avenue, to the east by residential properties, and to the west by Streeter Avenue. A Vicinity Map is included as Figure 1.

Background
As stated above, there are two commercial buildings located on the Site. The central building is an approximate 170,000-square foot vacant department store structure. The interior of the vacant department store building includes retail areas, warehouse and storage areas, a sub-grade basement, public and freight hydraulic elevators, and restrooms. The basement area contains a disconnected boiler, trash compactor, and emergency generator. An approximate 28,000-square foot former automotive service structure is located in the western portion of the Site. This building includes six bay doors opening to a concrete-paved former service area with secondary contaimnent structures, nine hydraulic hoists, and a sub-grade oil/water separator. The construction date of the two structures is likely the early- to mid-1960s based on review of historical documentation. The Site formerly contained a vehicle fueling island with three 10,000-gallon gasoline underground storage tanks (USTs) which were removed in 1985 and seven 1,000- to 2,000-gallon oil and waste oil USTs removed in 1987. The fueling station island and product lines were removed in 1994.

In 1985, gasoline leakage was discovered during UST removal at the former fueling island. In 1988, the petroleum release case was referred to the Santa Ana Regional Water Quality Control Board (SARWQCB). Six groundwater monitoring wells were installed in 1985. These wells were subsequently abandoned in 1992 and four new wells were installed. Five more wells were installed, and quarterly Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

groundwater monitoring began in 1993. Remedial activities reportedly included removal of free product and impacted soil. The SA-RWQCB granted regulatory closure for the UST release via a “No Further Action” letter dated June 26, 2003. The letter indicates that corrective action should be reviewed in the future if land use changes.

In 2014, Terracon performed a Phase I Environmental Site Assessment (ESA) including a site reconnaissance, interviews with knowledgeable personnel, review of historical documentation, and review of federal, state, and local regulatory databases. Based on the results of that assessment, the consultant also performed a Phase II ESA. In 2015, Terracon advanced five direct push borings to a maximum depth of 45 feet below ground surface for co-located soil and groundwater sampling. A total of five soil samples and five groundwater samples were collected. Sample locations were chosen to characterize potential impacts related to environmental concerns identified during the Phase I ESA including the former on-Site UST system, the automotive center oil/water separator, and solvent releases from the hydraulically up-gradient off-Site Crown Cleaners facility approximately 600 feet south of the Site. Collected soil and groundwater samples were analyzed for total petroleum hydrocarbons (TPH) and volatile organic compounds (VOCs).

Gasoline and diesel range organics were detected in soil adjacent to the former fueling island at concentrations of 1.9 and 26 milligrams per kilogram (mg/kg), respectively. Various fuel-related VOCs were also detected at low concentrations at this location, with the highest VOC detection being naphthalene at 1 mg/kg. Benzene was not detected nor were any chlorinated VOC compounds. TPH and VOCs were not detected in other soil samples.

Gasoline, diesel, and oil range organics were detected in groundwater at concentrations up to 5,700, 1,500, and 150 micrograms per liter (µg/L), respectively. Fuel-related VOCs including benzene, ethylbenzene, and total xylenes were detected at concentrations up to 7.8, 990, and 2,600 µg/L, respectively. The highest detected constituent concentrations typically occurred adjacent to the former fueling island. Tetrachloroethene (PCE) was detected in each of the five groundwater samples at concentrations up to 4.2 µg/L.

In May of 2022, the Site was entered in to the Site Cleanup Program of the SA-RWQCB by way of an Oversight Costs Reimbursement Agreement. A project scoping teleconference was conducted on May 31, 2022. A draft sampling and analysis plan (i.e. drafted figure and proposed analytical program was provided to the SA-RWQCB. Following SA-RWQCB review of the submittal, we were subsequently directed to generate a complete Work Plan for the proposed assessment activities.

Physical Setting
Topography
The Site is depicted on the United States Geological Survey (USGS) topographic map for the Riverside West 7.5-minute quadrangle. The Site is shown on the map as being situated at an elevation of approximately 780 feet above mean sea level. The Site and surrounding area appear relatively level with a slight gradient to the west.

Hydrology
The Site is situated within the Middle Santa Ana River Basin. There are no known substantial hydrologic features at the Site including major storm drain inlets or obvious drainages, channels, or surface waters. Due to the substantial amount of current paving at the Site, infiltration of precipitation to the Site is likely to be relatively minor. Currently, excess water appears to flow generally north and west as surface runoff to on-Site storm drains located in the parking areas and near the Site perimeter.

Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

On-Site storm drains appear to discharge to the municipal stormwater conveyance system. The Site does not appear to receive significant drainage from off-Site properties.

Geology
General geologic information pertaining to the Site is presented in the table below.

Geologic Consideration Details
California Geomorphic
Province Peninsular Ranges.

Mapped Soils or Formation The Site is underlain by holocene and pleistocene-age unconsolidated sand and pebble- to gravel-sand alluvial fan deposits.

Description of Soils or
Formation
Accoridng to lithological descriptions provided during prior subsurface investigative work, the Site is underlain by dark brown sandy clay and olive brown sandy silt to approximately 20 feet below ground surface and olive brown poorly graded sand to 35 to 45 feet below ground surface.

Distance/Direction to
Mapped Faults
Mapped unnamed faults within the western portion of the San Jacinto Fault Zone are located approximately eight miles east of the Site.

Hydrogeology
General hydrogeologic information pertaining to the Site is presented in the table below.

Hydrogeologic
Consideration Details
Groundwater Basin or Unit Upper Santa Ana Valley groundwater basin. Riverside-D Groundwater Management Zone.

Beneficial Uses Municipal and domestic supply, agricultural supply, industrial service supply, and industrial process supply.

Estimated Depth to
Groundwater
Based on previous subsurface investigative work, depth to groundwater is approximately 25 to 30 feet below ground surface.

Estimated Flow of
Groundwater Northwest.

Purpose
The purpose of this Work Plan is to document current environmental conditions at the Site in soil and soil gas in prepared for future residential Site redevelopment. The data collected during the assessment will be compared to various screening criteria pertaining to the protection of human health and the environment. More specifically, it is anticipated that the data will be used to develop soil management and vapor mitigation measures (if necessary) during anticipated future Site redevelopment activities.

Field Investigation
Technical Approach
Site assessment will comprise a combination of biased and non-biased sampling locations. A 100-foot grid overlaying the Site is used to organize and assist in sample location placement. Where a sample grid includes a previously identified potential contaminant source (i.e., the former auto center, oil and fuel USTs, fuel dispensers and piping, or potential PCE migration from the up-gradient cleaners), the sample location is biased towards the identified potential source (identified as “Tier 1” samples in Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

Table 1). Sample locations are also placed in approximately half of the remaining grid centers where potential contaminant sources have not been identified (“Tier 2” samples in Table 1).

Relative to sampling inside the two Site buildings, during initial project scoping, we intended to collect shallow soil samples and sub-slab vapor samples from select locations within the basement of the vacant department store building. This approach was at the request of a former staff member of the SA-RWQCB. However, in recent months, there was a flood event that occurred inside the building that resulted in substantial water (upwards of two to three feet) accumulating throughout the basement of the building. While the water was subsequently removed, due to significant heat at the time and minimal air flow/ventilation within the building (secured due to ongoing vandalism attempts), the water intrusion resulted in substantial microbial growth with in the basement area and subsequently impaired air quality (i.e. unsafe work environment). Regardless, the basement area will be backfilled following demolition to match existing adjacent grades. As such, sampling with in the basement area of the former department store building is not necessary for us to complete a comprehensive and appropriate assessment of the Site. However, there will be three sampling locations situated within the former automobile repair center as discussed later in this Work Plan.

As shown on Figure 2 and as detailed in Table 1, 47 sampling locations are proposed for the assessment. The locations are identified as B1 through B47 and are further described below:
• B1-B5 - Tier 1: Biased grid sampling along the southern Site boundary to address potential VOC migration from the south-adjoining commercial properties. • B14-B28 - Tier 1: Biased targeted sampling addressing the former auto center, oil and fuel USTs, and fuel dispensers.
• B29-B30 - Tier 1: Biased targeted sampling addressing the former auto center (basement area). • B6-B13 and B31-B47 - Tier 2: Non-biased grid sampling in areas with no identified potential contaminant sources.

Soil and soil gas sampling and analysis is proposed at each of the 47 locations. Soil borings will be drilled using direct-push drill rigs (truck-mounted or limited access). However, please note that at sample locations B29 and B30, if safe and reasonable access is not achievable within the basement area of the former automotive service area, these borings will be advanced manually using a stainless steel hand auger. Proposed soil sampling depths at each location are as follows:
• B1-B13 and B31-B47 – One, five and 15 feet.
• B14-B28 – One, five, 10, 15 and 20 feet.
• B29 and B30 (Automobile Service Basement Area) – One and five feet.

Soil sample depths may be adjusted in the field based on observed conditions (e.g., staining, olfactory conditions, professional judgment and/or elevated photoionization detector [PID] readings). Soil gas samples will be obtained at depths of five and 15 at all sampling locations with the exception of B29 and B30, where soil gas samples are proposed at five foot depths only. The soil borings will be completed by a licensed C-57 contractor. A detailed assessment methodology is provided below.

Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

Preliminary Field Activities
The following tasks will be performed before the commencement of field sampling activities:
• Proposed sampling locations will be marked-out and cleared for utilities. In addition, in accordance with State law, Dig-Alert will be notified.
• All equipment to be used during fieldwork activities will be inspected, pre-cleaned, and decontaminated.
• Field meters to be used during sampling (e.g., PID and other equipment) will be calibrated following manufacturer specifications.
• Sampling personnel will review the sample collection and health and safety protocols. • Notification to the SA-RWQCB of the commencement of fieldwork activities will be provided a minimum of 48 hours in advance of the work.

Soil Borings and Sampling
As stated previously, the 47 soil borings will be drilled using direct-push drill rigs and potentially using a hand auger at sample locations B29 and B30. During drilling activities, an organic vapor monitor will be used to monitor the presence and level of undifferentiated organic vapors in the borings and to screen soil samples which are collected. The instrument will also be used to screen for organic vapor in ambient air and the breathing zone of field personnel. A MiniRAE 3000 PID or equivalent will be used at the Site during the sampling activities. Upon completion of drilling and soil sampling, soil gas probes will be installed within the boreholes at the targeted depths. Precautions will be taken to limit the contamination of samples from outside sources. Hands will be washed with distilled water and soap, and nitrile gloves will be used, especially if petroleum products have been handled. Soils encountered at each boring location will be described and logged by a qualified field representative working under the supervision of a licensed California Professional Geologist. A log of each boring will be prepared in accordance with the Unified Soil Classification System.

The direct-push sampling system uses a hydraulic hammer to advance a two-inch diameter rod equipped with a soil sampling tool. Soil samples at targeted sampling depths are collected into acetate sleeves by unlocking the drive tip and pushing through the soil. The acetate sleeves containing soil are then retrieved, cut (in approximate six-inch sections), capped, sealed with ParafilmTM and the respective soil samples retained from the cores are labeled. Field preservation kits (EPA 5035) will also be utilized for the sampling. Soil sampling equipment will be decontaminated between uses by washing with a non-phosphate detergent solution followed by a triple distilled water rinse.

Hand augering (if required) at locations B29 and B30 uses a two inch diameter, stainless steel auger attached to a four to five-foot long T-bar which is turned by hand. For the collection of soil samples from the boreholes, the auger is removed and the soil is transferred into four ounce glass jars and then capped with Teflon coated lids and labeled. Field preservation kits (EPA 5035) will also be utilized during this sampling method. Soil sampling equipment will be decontaminated between uses by washing with a non-phosphate detergent solution followed by a drinking water rinse.

Soil Gas Probe Installation
Soil gas probe installation and sampling will be conducted in general accordance with the California Department of Toxic Substances Control 2015 Soil Gas Advisory. As stated previously, soil gas probes will be installed at depths of approximately five and 15 feet below ground surface, with the exception of B29 and B30, where samples are proposed at five foot depths only. After drilling to appropriate Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

depths, the soil gas probe tubing (one-eighth inch Nylaflow®), with a small filter attached to the end, will be inserted into the open boreholes. The probe tubing will be gently lifted to a height that places the filter in the approximate center of the sand pack, and six inches to one foot of sand will be poured down the borehole. Above the sand pack, six inches to one foot of dry granular bentonite will be added to prevent moisture from infiltrating the sand pack. The borehole will then be filled with hydrated bentonite to a depth approximately six inches to one foot beneath the desired depth of the shallow probe. The sand pack process will then be repeated for the five-foot vapor probe. The borehole will then be completed to the surface with hydrated bentonite. After completion, an airtight valve will be attached to the end of the probes. Each probe will be labeled with an identification tag that indicates sample identification (with probe depth), time the probe was installed, diameter and height of the sand pack, diameter and height of the dry bentonite, and total length of tubing used. QA/QC procedures to be used during probe installation will include cleaning sampling equipment in a non-phosphate detergent followed by successive rinses in potable water prior to each sampling effort, and the use of new, dedicated probe materials.

Soil Gas Probe Sampling Methodology
Purge volumes of the soil gas probes will be calculated. A total of three volumes of air will be purged from each probe. Prior to purging and sampling, a shut-in test will be conducted on the sampling train to check for leaks in the above-ground fittings. The shut-in test will be conducted by attaching the complete sample train assembly to the termination valve on the probe. With the valve attached to the probe in the “off” position, a purge syringe or vacuum pump will be used to evacuate the sample train of air to a minimum measured vacuum of approximately 100 inches of water. The vacuum will be observed on an in-line vacuum gauge, which is positioned prior to the purge syringe or vacuum pump.

The vacuum gauge will be observed for one minute and above ground connections will be considered “airtight” if the pressure on the gauge does not noticeably dissipate. If there is an observable loss in vacuum, the fittings in the sample assembly will be checked and tightened, and the test repeated.

Sampling will not commence until the above ground fittings are deemed airtight.

A leak test, using helium as a gaseous tracer, will be performed on each individual soil gas probe in order to test the integrity of the entire sampling system. Its purpose will be to evaluate whether an adequate seal is established at the probe interface with the ground surface, as well as a leak check of all above ground fittings to ensure that the samples collected are not being diluted by ambient air. The helium gas is contained in a shroud that is then placed over the probe location, or the entire sample train, evaluating any leaks in the sampling system.

After a minimum two-hour equilibration time, the probes will then be purged using either plastic calibrated syringes or vacuum pumps. Flow rates between 100 to 200 milliliters per minute (mL/min) and probe vacuum pressures of less than 100 inches of water will be maintained during purging to minimize stripping and to prevent ambient air from diluting the samples. When using a syringe for purging and sample collection, flow rates can be monitored by timing the interval at which the plunger is drawn. A 60 mL syringe will take approximately 20 seconds to fill to maintain a 200 mL/min flow rate. When using a vacuum pump, in-line calibrated flow meters will be used to accurately monitor flow rates. The flow meters have metering valves that allow the flow rates to be increased or decreased to the appropriate rate.

An in-line vacuum gauge will be used when purging with a syringe or a pump to maintain probe vacuum pressures less than 100 inches water. If, while purging, vacuum pressure exceeds 100 inches water, the client will be informed that the probe location appears to be in a low-permeable soil formation. The sample technician will then slow the purge flow to a rate of 100 mL/min in an attempt Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

to maintain flow and keep the applied vacuum below 100 inches water. If it is not possible to maintain this flow rate without applying excess vacuum, alternative sampling methods will be attempted to collect a sample in these prohibitive, low flow conditions.

Following purging, soil gas samples will be collected in to evacuated batch certified Summa™ canisters. The canisters will be attached to a sample assembly (also called a flow regulator or flow restrictor) via a quick-connect fitting. The sample assembly contains a vacuum gauge that is used to monitor the summa canister vacuum pressure and a critical orifice that restricts the flow of air through the device at the desired rate. The leading end of the sample assembly contains a barb fitting that is attached to the “T” fitting (or three-way valve) connected to the probe on/off valve, and prior to the purging device. After purging of the probe has been completed, the valve will be rotated so that the flow path of the probe is diverted towards the sample assembly and Summa™ canister. The valve on the Summa™ canister will then be opened and sampling will commence. Canister vacuum pressures will be recorded prior to sampling and again after sampling has been completed. The vacuum pressure will be allowed to reach zero during the collection of the sample. This allows the canister to be under zero pressure and, along with the shut-off male quick connect fitting and the canister valve, assures that there is no potential for unwanted air to enter the canister should a leak occur during transit.

Laboratory Analysis
As shown in Table 1, the following analytical laboratory testing is proposed during the assessment:
• One foot depth of borings B14-B28 and B29 and B30 – TPH by United States EPA test Method 8015B.
• One foot depth of borings B1-B13 and B31-B47 – Screen for Suspect Conditions and Analyze for TPH by United States EPA test Method 8015B if Warranted. • Five, 10, 15 and 20 foot depths of borings B14-B28 and five foot depths of borings B29 and B30 - TPH by United States EPA test Method 8015B.
• Five and 15 foot depths of borings B1-B13 and B31-B47, five, 10, 15 and 20 foot depths of borings B14-B28 and five foot depth of borings B29 and B30 – VOCs by United States EPA test Method 8260B.

Soil gas samples will be analyzed for VOCs by United States EPA test Method TO-15. Laboratory reporting and method detection limits will be at low enough values to ensure that data quality objectives are met in order to evaluate the Site for future residential development.

Quality Assurance/Quality Control
Field Reports
To provide complete documentation of the sampling activities, field personnel will maintain detailed records. At a minimum, these records will include the following information:
• Site name and address
• Name of field log recorder
• Team members on-Site and associated duties
• Other persons on-Site (e.g., subcontractors, regulatory personnel) • A summary of meetings held at the Site
• Levels of safety protection utilized
• Weather conditions
Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

• Calibration readings for field monitoring equipment
• Sample collection time
• Other relevant information
Field Duplicates
Field duplicates are collected to assess the precision of the sampling protocol and analytical methods and are analyzed in the same manner as their respective primary samples. One field duplicate will be collected for every 20 primary samples collected of each media. Field duplicates will be analyzed using the same analyses requested for their respective primary samples. Duplicate samples will be selected at the beginning of the sampling event using a random number generator. The precision goals for field duplicate analyses are primarily based on the calculated relative percent difference (RPD) which is derived as follows:

RPD = Y-X / (Y+X)/2 x 100
Precision goals are as follows:
• For analytes detected at concentrations greater than or equal to five times the reporting limit in both field duplicate samples, the RPD must be less than or equal to 40 percent. • For analytes detected at concentrations less than five times the reporting limit, including nondetects in either field duplicate sample, the absolute difference between the sample concentrations must be less than or equal to four times the reporting limit.

Field Equipment Blank Samples
One field equipment blank per day will be analyzed during each day of sampling. Equipment blanks are prepared in the field by pouring distilled, de-ionized water into cleaned sampling equipment and are used to evaluate equipment decontamination procedures and the potential for cross contamination during sample collection. Field equipment blanks will be analyzed using the same analyses requested for their respective primary samples (i.e., the samples collected that day).

Trip Blank Samples
Trip blanks will consist of a set of sample bottles filled at the laboratory with laboratory-demonstrated analyte-free water. The water will originate from one common source and physical location within the laboratory and will be the same water as the method blank water used by the laboratory. Trip blanks will be handled, transported, and analyzed in the same manner as the samples collected that day, except that the sample containers themselves will always remain closed in the field. The sealed containers will travel with the sample cooler. Individual sample matrices and associated blanks will be packaged in separate sample coolers before shipment back to the lab. Trip blanks will return to the laboratory with the same set of bottles they accompanied to the field. Trip blanks will be analyzed for VOCs.

The primary purpose of trip blank samples is to detect outside sources of contamination that might influence contaminant values reported in actual samples both quantitatively and qualitatively, indicated by analytical values greater than the practical quantitation limit. Trip blanks will serve as a mechanism of control on sample bottle preparation and blank water quality as well as sample handling.

Contaminated trip blanks may indicate inadequate bottle cleaning or blank water of questionable quality.

Work Plan For Subsurface Assessment October 3, 2022
Former Sears Retail - 5261 Arlington Avenue
Riverside, California

Laboratory Quality Control Samples
The analytical laboratories will prepare and analyze appropriate laboratory quality control samples in accordance with the EPA laboratory methods. Weis Environmental project managers will review the results of such samples to ensure data generated are of acceptable quality. Quality Control Summary Form (sample included as Attachment 1) will be completed and submitted in applicable reports.

Waste Disposal
Soil cuttings and decontamination water generated during the field activities will be placed into Department of Transportation approved steel 55-gallon drums and stored on-Site pending analytical results. The drums will be profiled, transported, and disposed of by an appropriate vendor licensed to manage such waste.

Reporting
A written report of the results of the assessment will be prepared and submitted to the SA-RWQCB.

The report will include a detailed description of the field activities performed, results of laboratory analyses, our findings, conclusions and recommendations. The data evaluation will also include a human health risk evaluation relative to the potential vapor intrusion exposure pathway. In the event that impacts are identified at the total depths of one or more of the borings, additional assessment may be warranted depending on the concentrations and trends of any contaminants within given boreholes.

Closure
If you have any questions or require additional information regarding this Work Plan, please contact us at 760.585.7070.

Sincerely,
Daniel Weis, R.E.H.S. Eric M. Cathcart, MS, PG
Environmental Manager Senior Geologist
California Professional Geologist #7548
James Wright, MS
Project Manager
Attachments
Figure 1 – Vicinity Map
Figure 2 – Site Plan
Table 1 – Sample Locations and Rationale
Attachment – QA/QC Checklist for Laboratory Data Review

FIGURES
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
SITE
Figure 1 - Vicinity Map
5261 Arlington Avenue
Riverside, California
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 2
Site Plan
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
B47
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
B5
B4
B3
B2
B1
B6
B7
B8
B9
B10
B11
B31
B32
B33
B35
B42
B43
B47
B44 B36
B41
B12
B13
B14
B17
B19
B30
B29
B28
B27
B26
B38
B39
B40
B37 B45
B46
B34
B15
B16
B18
100-foot Grid
B20
B21
B22 B23
B24
B25
Sears Building
(Basement Throughout to be Backfilled)
Basement
to be
Backfilled
TABLE
Table 1 - Sample Locations and Rationale
5261 Arlington Avenue, Riverside, CA
Location
IDs
Depth
(feet)1,2 Sample Location and Rationale3,4,5 Soil Analytes6 Soil Gas Analytes7 1 Screen for Suspect Conditions and Analyze for TPH if Warranted -- 5 VOCs VOCs
15 VOCs VOCs
1 TPH --
5 TPH, VOCs VOCs
10 TPH, VOCs --
15 TPH, VOCs VOCs
20 TPH, VOCs --
1 TPH --
5 TPH, VOCs VOCs
1 Screen for Suspect Conditions and Analyze for TPH if Warranted -- 5 VOCs VOCs
15 VOCs VOCs
Tier 1: Biased Grid sampling along the southern Site
boundary to address potential VOC migration from
the south-adjoining commercial properties.

B1-B5

3. Tier 1 sample locations are those addressing an identified potential contaminant source (i.e. biased sample location).

4. Tier 2 sample locations are those without an identified potential contaminant source (non-biased sample location).

B14-B28
Tier 1: Biased targeted sampling addressing the
former auto center, oil and fuel USTs, and fuel
dispensers.

B6-B13,
B31-B47
Tier 2: Grid sampling in areas with no identified
potential contaminant sources.

Notes:

2. Grid refers to a 100-foot sampling grid. See Figure 2.

1. While sample collection is proposed at 1, 5, and 15 feet, deeper sampling will be conducted at locations where observations suggest soil impacts at greater depths.

B29-B30 Tier 1: Biased targeted sampling addressing the former auto center (basement area).

VOCs - Volatile organic compounds. United States EPA TO-15.

VOCs - Volatile organic compounds. United States EPA 8206B/5035. Field preservation methods to be utilized during sampling.

TPH - Total petroleum hydrocarbons. United States EPA 8015B (gasoline, diesel and oil range organics).

5. Soil Analytical

6. Soil Gas Analytical

QA/QC CHECKLIST FOR LABORATORY DATA REVIEW

QA/QC CHECKLIST FOR LABORATORY DATA REVIEW
Project: Method(s):

Laboratory:

Sampling Dates: Samples:

Analysis Dates:

Lab Report Date:

Lab Report Number:

Item Y/N Initials Comment

1. Chain-of-Custody Complete
and Correct?

2. Samples ID’s on Lab Report
Match those on COC?

3. Required Analyses Reported?

4. Holding Times Met?

5. Lab Report Complete, signed
Dated, on Time?

6. Travel and Equip Blanks
Okay?

7. Field Duplicates Okay?

8. Lab Method Blanks Okay?

9. Surrogate Recovery Okay?

10. Matrix Spike Recovery Okay?

11. BS Recovery Okay?

12. BSD & or MSD Dupes Okay?

13. Reporting Limits Met?

14. Units match Matrix?

15. Data Make Sense?

16. Any Unusual Data?

17. Corrective Action Needed?

18. Correction Action Reported?
Follow-up with Lab Required?
Signature of Reviewer Date:

WEIS-D
Comprehensive Subsurface
Assessment
Subsurface Assessment Report
Former Sears Retail
5261 Arlington Avenue
Riverside, California 92504
GeoTracker Global ID# T10000018601
November 3, 2023
Presented to:

Santa Ana Regional Water Quality Control Board
3737 Main Street, Suite 500
Riverside, California 92501
On behalf of:

Foulger-Pratt
136 Calle de los Molinos
San Clemente, California 92677
Project Number 22-05-041
Prepared by:

Weis Environmental, LLC
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
www.weisenviro.com
1938 Kellogg Avenue, Suite 116, Carlsbad, CA 92008
(760) 585-7070
www.weisenviro.com
November 3, 2023
Mr. Miguel Oviedo
Santa Ana Regional Water Quality Control Board
3737 Main Street, Suite 500
Riverside, CA 92501
Subject: Subsurface Assessment Report
Former Sears Retail
5261 Arlington Avenue
Riverside, California 92504
Global ID T10000018601
Dear Mr. Oviedo:

On behalf of Foulger-Pratt, Weis Environmental, LLC has prepared this Subsurface Assessment Report for the property identified as Former Sears Retail and located at 5261 Arlington Avenue, in the City of Riverside, Riverside County, California. This report was completed in accordance with the standards of care exercised by environmental professionals in the industry and under the technical direction of the undersigned. If you have questions regarding this report, please contact us at (760) 585-7070.

Sincerely,
Weis Environmental, LLC
Daniel Weis, R.E.H.S. Eric M. Cathcart, MS, PG
Environmental Manager Senior Geologist
California Professional Geologist #7548
James Wright, MS
Project Manager

TABLE OF CONTENTS

1.0 INTRODUCTION .........................................................................................................................1

1.1 Introduction............................................................................................................................1

1.2 Background ............................................................................................................................1

1.3 Physical Setting......................................................................................................................2

2.0 FIELD ACTIVITIES AND METHODOLOGY............................................................................4

2.1 Technical Approach ...............................................................................................................4

2.2 Preliminary Field Activities...................................................................................................5

2.3 Sample Collection Methodology............................................................................................5

2.4 Laboratory Analysis...............................................................................................................7

2.5 Investigation-Derived Waste..................................................................................................7

3.0 RESULTS ......................................................................................................................................8

3.1 Subsurface Conditions............................................................................................................8

3.2 Soil Analytical Results...........................................................................................................8

3.3 Groundwater Analytical Results ............................................................................................9

3.4 Soil Gas Analytical Results..................................................................................................10

3.5 Data Assessment ..................................................................................................................11

4.0 DISCUSSION..............................................................................................................................12

4.1 Soil .......................................................................................................................................12

4.2 Groundwater.........................................................................................................................12

4.3 Soil Gas................................................................................................................................13

5.0 CONCLUSIONS AND RECOMMEDNATIONS ......................................................................15

6.0 REQUEST FOR NO FURTHER ASSESSMENT ......................................................................17

7.0 REFERENCES ............................................................................................................................18

FIGURES
Figure 1 Vicinity Map
Figure 2 Aerial Photograph
Figure 3 Site Plan
Figure 4 Soil TPH Results (mg/kg)
Figure 5 Soil Benzene and Ethylbenzene Results (µg/kg)
Figure 6 Groundwater TPH Results (mg/L)
Figure 7 Groundwater VOC Results (µg/L)
Figure 8 Soil Gas Benzene and Ethylbenzene Results with 5-Foot Contours (µg/m3) Figure 9 Soil Gas Benzene and Ethylbenzene Results with 15-Foot Contours (µg/m3) Figure 10 Soil Gas PCE and TCE Results (µg/m3) with PCE (5 Foot) Contours Figure 11 Soil Gas PCE and TCE Results (µg/m3) with PCE (15 Foot) Contours TABLES
Table 1 Sample Location Rationales
Table 2 Soil TPH Analytical Results
Table 3 Soil VOC Analytical Results
Table 4 Groundwater TPH Analytical Results
Table 5 Groundwater TPH Analytical Results
Table 6 Soil Gas Analytical Results

ATTACHMENTS
Attachment A 2015 Phase II Environmental Site Assessment Analytical Results Attachment B Boring Logs
Attachment C Soil and Groundwater Analytical Laboratory Reports Attachment D Soil Gas Analytical Laboratory Report
Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

1.0 INTRODUCTION

1.1 Introduction
On behalf of Foulger-Pratt, Weis Environmental, LLC has prepared this Subsurface Assessment Report for the Former Sears Retail property located at 5261 Arlington Avenue in the City of Riverside, California (Site). The Site is a reported 17.43 acres and is assigned County of Riverside Assessor’s Parcel Number (APN) 226-180-015. Current Site improvements include a vacant single-story former department store structure with a basement level and a single-story former automotive repair center with a basement level. Asphalt-paved parking areas with minor landscaping are present surrounding both buildings and throughout the remainder of the Site. The Site is bound to the north by commercial and residential properties, to the south by Arlington Avenue, to the east by residential properties, and to the west by Streeter Avenue. A Vicinity Map and Aerial Photograph are included as Figures 1 and 2, respectively.

Site Identification
Current Legal Site Address – 5261 Arlington Avenue, Riverside, California 92504 Historical Addresses – None identified.

GeoTracker Global ID# T10000018601
County of Riverside APN – 226-180-015

1.2 Background
Two vacant commercial buildings are located on the Site. The central building is an approximately 170,000-square-foot department store structure. The interior of the vacant department store building includes retail areas, warehouse and storage areas, a sub-grade basement, public and freight hydraulic elevators, and restrooms. The basement area contains a disconnected boiler, trash compactor, and emergency generator. An approximately 28,000-square-foot former automotive service structure is located in the western portion of the Site. This building is also underlain by a basement and includes multiple bay doors opening to a concrete-paved former service area with secondary containment structures, nine hydraulic hoists, and a sub-grade oil/water separator. The construction date of the two structures is likely the early- to mid-1960s based on review of historical documentation. The Site formerly contained a vehicle fueling island with three 10,000-gallon gasoline underground storage tanks (USTs), which were removed in 1985, and seven 1,000- to 2,000-gallon oil and waste oil USTs removed in 1987. The fueling station island and product lines were removed in 1994.

In 1985, gasoline leakage was discovered during UST removal at the former fueling island. In 1988, the petroleum release case was referred to the Santa Ana Regional Water Quality Control Board (SA-RWQCB). Six groundwater monitoring wells were installed in 1985 and abandoned in 1992.

Between 1992 and 1993, nine new wells were installed, and quarterly groundwater monitoring began in 1993. Reportedly, remedial activities included removal of free product and impacted soil. The SA-RWQCB granted regulatory closure for the UST release via a “No Further Action” letter dated June 26, 2003. The letter indicates that corrective action should be reviewed in the future if land use changes.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

In 2014, Terracon Consultants, Inc. performed a Phase I Environmental Site Assessment (ESA) of the Site that included a physical reconnaissance, interviews with knowledgeable personnel, review of historical documentation, and review of federal, state, and local regulatory databases. Based on the results of that assessment, the consultant recommended and performed a Phase II ESA. In 2015, Terracon advanced five direct-push borings to a maximum depth of 45 feet below ground surface for collocated soil and groundwater sampling. A total of five soil samples and five groundwater samples were analyzed. Sample locations were chosen to characterize potential impacts related to environmental concerns identified during the Phase I ESA, including the former on-Site UST system, the automotive center oil/water separator, and solvent releases from an off-Site, hydraulically upgradient dry cleaning business (Crown Cleaners) located approximately 600 feet south of the Site at 5190 Arlington Avenue. Soil and groundwater samples were analyzed for total petroleum hydrocarbons (TPH) and volatile organic compounds (VOCs).

Gasoline- and diesel-range petroleum hydrocarbons (TPHg and TPHd, respectively) were detected in soil adjacent to the former fueling island at concentrations of 1.9 and 26 milligrams per kilogram (mg/kg), respectively. Various fuel-related VOCs were also detected at low concentrations at this location, with the highest VOC detection being naphthalene at 1 mg/kg. Benzene was not detected nor were any chlorinated VOC compounds. TPH and VOCs were not detected in other soil samples.

TPHg, TPHd, and oil-range petroleum hydrocarbons (TPHo) were detected in groundwater at concentrations up to 5.7, 1.5, and 0.15 milligrams per liter (mg/L), respectively. Fuel-related VOCs including benzene, ethylbenzene, and total xylenes were detected at concentrations up to 7.8, 990, and 2,600 micrograms per liter (µg/L), respectively. The highest detected constituent concentrations typically occurred adjacent to the former fueling island. Tetrachloroethene (PCE) was detected in each of the five groundwater samples at concentrations up to 4.2 µg/L. Tabulated analytical results and a Site map prepared as part of the 2015 Phase II ESA are included in Attachment A to this report.

In May 2022, the Site was entered into the Site Cleanup Program of the SA-RWQCB by way of an Oversight Costs Reimbursement Agreement. A project scoping teleconference was conducted on May 31, 2022. Weis Environmental subsequently submitted a draft sampling and analysis plan (i.e., drafted figure and proposed analytical program) to SA-RWQCB. Following SA-RWQCB review of the draft sampling and analysis plan, a Work Plan for Subsurface Assessment (Work Plan), dated October 3, 2022, was submitted. In a letter dated May 18, 2023, SA-RWQCB conditionally approved the Work Plan contingent upon modifications to address certain comments. This report describes activities associated with the implementation of the SA-RWQCB approved Work Plan.

1.3 Physical Setting
Topography
The Site is depicted on the United States Geological Survey (USGS) topographic map for the Riverside West 7.5-minute quadrangle. The Site is shown on the map as being situated at an elevation of approximately 780 feet above mean sea level. The Site and surrounding area appear relatively level with a slight gradient to the west.

Hydrology
The Site is situated within the Middle Santa Ana River Basin. There are no known substantial hydrologic features at the Site such as obvious drainages, channels, or surface waters. Since pavement Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

covers the majority of the Site, infiltration of precipitation to the Site is likely to be relatively minor.

Currently, excess water appears to flow generally north and west as surface runoff to on-Site storm drains located in the parking areas and near the Site perimeter. On-Site storm drains discharge to the municipal stormwater conveyance system. The Site does not receive significant drainage from off-Site properties.

Geology
General geologic information pertaining to the Site is presented in the table below.

Geologic Consideration Details
California Geomorphic
Province Peninsular Ranges.

Mapped Soils or Formation The Site is underlain by Holocene- and Pleistocene-age unconsolidated sand and pebble- to gravel-sand alluvial fan deposits.

Description of Soils or
Formation
Primarily light and dark brown silty sands and poorly graded sands with interspersed silty clays and clayey silts. Shallow silts and silts with sand were encountered in the eastern and northeastern portions of the Site.

Distance/Direction to
Mapped Faults
Mapped unnamed faults within the western portion of the San Jacinto Fault Zone are located approximately 8 miles east of the Site.

Hydrogeology
General hydrogeologic information pertaining to the Site is presented in the table below.

Hydrogeologic
Consideration Details
Groundwater Basin or Unit Upper Santa Ana Valley groundwater basin. Riverside-D Groundwater Management Zone.

Beneficial Uses Municipal and domestic supply, agricultural supply, industrial service supply, and industrial process supply.

Estimated Depth to
Groundwater Approximately 35 to 45 feet below ground surface.

Estimated Flow of
Groundwater Northwest.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

2.0 FIELD ACTIVITIES AND METHODOLOGY

2.1 Technical Approach
As described in the Work Plan and SA-RWQCB comments/modifications, the Site assessment comprised a combination of biased and non-biased sampling locations. A 100-foot grid overlaying the Site was used to organize and assist in sample location placement (Figure 3). Where a sample grid included a previously identified potential contaminant source (i.e., the former auto center, oil and fuel USTs, former fueling island and piping, or potential chlorinated VOC migration from the up-gradient drycleaners), the sample location was biased towards the identified potential source (identified as “Tier 1” samples in Table 1). Sample locations were also placed in approximately half of the remaining grid centers where potential contaminant sources had not been identified (“Tier 2” samples in Table 1).

During initial project scoping, the intention was to collect shallow soil samples and sub-slab vapor samples from select locations within the basement of the vacant department store building. This approach was at the request of a former staff member of the SA-RWQCB. However, a flood event that occurred inside the building resulted in substantial water (upwards of 2 to 3 feet) accumulating throughout the basement of the building. While the water was subsequently removed, due to heat at the time and minimal air flow/ventilation within the building (secured due to ongoing vandalism attempts), the water intrusion resulted in substantial microbial growth within the basement area and impaired air quality, creating an unsafe work environment. Regardless, the basement area will be backfilled following demolition to match existing adjacent grades. As such, sampling within the basement area of the former department store building was deemed unnecessary for completing a comprehensive and appropriate Site assessment. However, three sampling locations within the former automobile repair center basement were collected as described in the Work Plan and this report.

As shown on Figure 3 and as detailed in Table 1, borings were advanced at 49 sampling locations during this assessment. The locations are identified as B01 through B49 and are further described below:
• B01-B05 - Tier 1: Biased grid sampling along the southern Site boundary to address potential VOC migration from the south-adjoining commercial properties (including Crown Cleaners). • B14-B27 and B49 - Tier 1: Biased targeted sampling addressing the former auto center, oil and fuel USTs, former fueling island, and surrounding areas. • B28-B30 - Tier 1: Biased targeted sampling addressing the former auto center (basement area). • B6-B13 and B31-B48 - Tier 2: Non-biased grid sampling in areas with no identified potential contaminant sources.

Soil and soil gas sampling and analysis was conducted at 48 of the 49 locations (B01 through B48); location B49 was selected as a groundwater-only location representative of conditions at both B16 and B17. Except for locations B28-B30, soil borings were drilled using direct-push drill rigs (truck-mounted) by Astech Environmental and ABC Liovin of Santa Ana and Signal Hill, California, respectively. The concrete flooring at sample locations B28, B29, and B30 was cored, and these borings were advanced manually using a stainless-steel hand auger. Soil borings were advanced to depths ranging from approximately 5 to 40 feet below ground surface.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

2.2 Preliminary Field Activities
The following tasks were performed before the commencement of field sampling activities:
• Proposed boring locations were marked-out and cleared for utilities. In accordance with state law, Dig-Alert was notified at least two working days prior to drilling. • All fieldwork equipment was inspected, pre-cleaned, and decontaminated. • Field meters used during sampling (e.g., photoionization detector [PID] and other equipment) were calibrated following manufacturer specifications.
• Sampling personnel reviewed the sample collection and health and safety protocols. • Notification to SA-RWQCB of the commencement of fieldwork activities was provided a minimum of 48 hours in advance of the work.

2.3 Sample Collection Methodology
Soil
Forty-eight (48) soil borings were advanced at the Site between June 15 and June 21, 2023. Due to spatial limitations, the three indoor basement locations (B28-B30) were hand augured to a depth of 5 feet. The remaining outdoor locations were advanced to boring termination using truck-mounted Geoprobe direct-push sampling rigs. Soil samples were typically obtained from depths of 1, 5, and 15 feet at locations B01-B13 and B31-B48, and every 5 feet until boring termination at locations B14- B30. During drilling activities, a MiniRAE 3000 PID calibrated to hexane was used to monitor the presence and level of undifferentiated VOCs in the borings and to screen collected soil samples. The instrument was also used to screen for organic vapor in ambient air and the breathing zone of field personnel. Precautions were taken to limit the potential contamination of samples from outside sources.

Hands were washed with distilled water and soap, and nitrile gloves were used. Soils encountered at each boring location were described and logged by a qualified field representative working under the supervision of a licensed California Professional Geologist. Boring logs prepared in accordance with the Unified Soil Classification System are included as Attachment B.

The direct-push sampling system uses a hydraulic hammer to advance a 2-inch-diameter rod equipped with a soil sampling tool. Soil samples at targeted sampling depths were collected into acetate sleeves by unlocking the drive tip and pushing through the soil. The acetate sleeves containing soil were retrieved, cut into 6-inch sections, sealed with ParafilmTM, capped, and labeled. At hand auger locations and where acetate sleeves became jammed, soil samples were collected using laboratory-provided, certified clean 4-ounce glass jars. Field preservation kits (Environmental Protection Agency [EPA] 5035) were also utilized during the sampling activities (for soil VOC analysis). Samples were placed into an iced cooler for transport to the analytical laboratory under standard chain-of-custody documentation. Soil sampling equipment was decontaminated between uses by washing with a nonphosphate detergent solution followed by a triple distilled water rinse.

Groundwater
Boring locations B01-B05, B13, B15, B19, B20, B24, B26, and B49 (representative location for borings B16 and B17) were converted to temporary groundwater wells. Well construction consisted of 2-inch PVC pipe with 10 feet of screen at the bottom of each boring. One groundwater grab sample Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

was collected from each well with a disposable polyethylene groundwater bailer. A new, unopened bailer was used at each temporary well. Water samples were collected in new, laboratory-provided 1-liter (L) amber glass bottles and 40-milliliter (mL) sample vials. The 40-mL sample vials were filled completely to eliminate headspace, capped, inverted, and tapped to check for air bubbles. If bubbles were present, the vial would be uncapped, filled, and rechecked. This procedure was repeated until an acceptable sample was obtained. Collected groundwater samples were placed into an iced cooler for transport to the analytical laboratory under standard chain-of-custody documentation.

Soil Gas
Soil gas probe installation and sampling was conducted in general accordance with the California Department of Toxic Substances Control (DTSC) 2015 Soil Gas Advisory. Soil gas probes were installed at depths of 5 and 15 feet at the 48 soil boring locations. After drilling termination, borings were backfilled with bentonite to approximately 16 feet below ground surface and the soil gas probe tubing (1/8-inch Nylaflow®), with a small filter attached to the end, was inserted into the open boreholes. The probe tubing was gently lifted to a height that places the filter in the approximate center of the sand pack (approximately 15 feet), and 6 inches to 1 foot of sand were poured down the borehole.

Above the sand pack, 6 inches to 1 foot of dry granular bentonite was added to prevent moisture from infiltrating the sand pack. The borehole was then filled with hydrated bentonite to a depth approximately 6 inches to 1 foot beneath the desired depth of the shallow probe (5 feet). The sand pack process was repeated for the 5-foot vapor probe. The borehole was completed to the surface with hydrated bentonite. After completion, an airtight valve was attached to the end of the probes. Each probe was labeled with an identification tag that indicated sample identification (with probe depth), time the probe was installed, diameter and height of the sand pack, diameter and height of the dry bentonite, and total length of tubing used. Quality assurance/quality control (QA/QC) procedures used during probe installation included cleansing sampling equipment in a non-phosphate detergent followed by successive rinses in potable water prior to each sampling effort, and the use of new, dedicated probe materials.

Purge volumes of the soil gas probes and sub-slab vapor probes were calculated. A total of three volumes of air were purged from each probe. Prior to purging and sampling, a shut-in test was conducted on the sampling train to check for leaks in the above-ground fittings. The shut-in test was conducted by attaching the complete sample train assembly to the termination valve on the probe. With the valve attached to the probe in the “off” position, a purge syringe or vacuum pump was used to evacuate the sample train of air to a minimum measured vacuum of approximately 100 inches of water.

The vacuum was observed on an in-line vacuum gauge, which was positioned prior to the purge syringe or vacuum pump. The vacuum gauge was observed for one minute and above ground connections were considered “airtight” if the pressure on the gauge did not noticeably dissipate. If there was an observable loss in vacuum, the fittings in the sample assembly were checked and tightened, and the test repeated. Sampling did not commence until the above ground fittings were deemed airtight.

A leak test, using helium as a gaseous tracer, was performed on each individual soil gas probe and subslab vapor probe to test the integrity of the sampling system. Its purpose was to evaluate whether an adequate seal was established at the probe interface with the ground surface, as well as a leak check of above ground fittings to ensure that the samples collected were not being diluted by ambient air. The helium gas was contained in a shroud that was then placed over the probe location, or the entire sample train, evaluating any leaks in the sampling system.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

After a minimum two-hour equilibration time, the probes were purged using either plastic calibrated syringes or vacuum pumps. Due to being installed in a hand auger boring, soil gas probes SG28-5, SB29-5, and SG30-5 (basement borings B28-B30) were sampled approximately one week after installation to ensure adequate equilibration time. Flow rates between 100 to 200 milliliters per minute (mL/min) and probe vacuum pressures of less than 100 inches of water were maintained during purging to minimize stripping and to prevent ambient air from diluting the samples. In-line calibrated flow meters were used to accurately monitor flow rates. The flow meters have metering valves that allow the flow rates to be increased or decreased as appropriate. While purging, vacuum pressure did not exceed 100 inches of water, low permeability soil formations were not an issue, and alternative sampling methods were not deemed necessary.

Following purging, soil gas samples were collected in evacuated 400 mL or 1-liter capacity Summa™ canisters. The canisters were attached to a sample assembly (also called a flow regulator or flow restrictor) via a quick-connect fitting. The sample assembly contained a vacuum gauge to monitor the Summa™ canister vacuum pressure and a critical orifice that restricts the flow of air through the device at the desired rate. The leading end of the sample assembly contained a barb fitting that is attached to the “T” fitting (or three-way valve) connected to the probe on/off valve, and prior to the purging device.

After purging of the probe was completed, the valve was rotated so that the flow path of the probe is diverted towards the sample assembly and Summa™ canister. The valve on the Summa™ canister was opened and sampling commenced. Canister vacuum pressures were recorded prior to sampling and again after sampling was completed. The vacuum pressure was allowed to reach zero during the collection of the sample. This allowed the canister to be under zero pressure and, along with the shut-off male quick-connect fitting and the canister valve, assured that there was no potential for unwanted air to enter the canister should a leak occur during transit.

2.4 Laboratory Analysis
Groundwater and soil samples targeting former UST, fueling island, and auto repair areas (B14-B30) collected during this assessment were analyzed for VOCs including fuel oxygenates and TPH by EPA test Methods 8260B/5035 and 8015B, respectively, by American Environmental Testing Laboratory, LLC (AETL) of Burbank, California. The remaining soil samples (B01-B13 and B31-B48) were analyzed for VOCs including fuel oxygenates by EPA test Method 8260B/5035 by AETL. One soil sample was analyzed for Title 22 Metals by EPA test Method 6010B for waste characterization purposes. Soil gas samples were analyzed for VOCs by EPA test Method TO-15 by Baseline Analytical Services of Huntington Beach, California; select soil gas samples were analyzed for oxygen by ASTM International test method D1946.

2.5 Investigation-Derived Waste
A minor amount of soil cuttings were generated during the field activities and placed into a Department of Transportation-approved steel 55-gallon drum and stored on-Site pending analytical results. The drum contents were profiled as non-hazardous waste by Costera Waste & Environmental, Inc.

However, after profiling but prior to being retrieved from the Site, the drum was no longer present onSite (assumed to have been stolen by a third-party). Being that the soil cuttings were very minor in volume and non-hazardous in nature, this is not considered to be a significant upset condition.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

3.0 RESULTS

3.1 Subsurface Conditions
Soils encountered in the borings advanced at the Site during this subsurface assessment consisted of alluvium comprised primarily of light and dark brown silty sands and poorly graded sands with interspersed silty clays and clayey silts. Shallow silts and silts with sand were encountered in the eastern and northeastern portions of the Site. Groundwater was encountered at boring locations B01-B05, B13, B15, B19, B20, B24, B26, and B49 at depths ranging from approximately 35 to 45 feet below the ground surface. Bedrock was not encountered in the soil borings. Light to moderate hydrocarbon staining and odors were observed/noted in the former UST and fueling island areas at locations B16 (25 to 30 feet), B17 (20 to 30 feet), B18 (15 to 20 feet), B19 (30 to 35 feet), and B20 (12 to 36 feet), and at the former waste oil UST area (B21; 5 to 10 feet). During the screening of majority of Site soils using the PID instrument, no undifferentiated VOCs were detected. In the former UST areas where hydrocarbon staining and odors were observed/noted, relatively low concentrations of undifferentiated VOCs were generally detected (less than 20 parts per million (ppm)) with a few anomalous detections above 50 ppm and at a high of 380 parts per million). The 50 ppm threshold represents an action level set by the South Coast Air Quality Management District under their Rule 1166 for the handling and management of VOC impacted soil. Descriptions of the subsurface materials encountered during this assessment are provided in the boring logs included in Attachment B.

3.2 Soil Analytical Results
A total of 186 soil samples were obtained during the field activities. Between two and nine soil samples from each boring were analyzed for one or more chemical constituents. Typically, soil samples collected in the former UST, fueling island, and auto repair areas were analyzed for TPH and VOCs while the remaining samples were analyzed for VOCs only. One sample collected in the eastern portion of the Site (B32-1) was analyzed for TPH to establish the presence or absence of a bioattenuation zone at that location. TPH and VOC soil analytical results are presented in Tables 2 and 3 and Figures 4 and 5, respectively. Soil analytical laboratory reports are included in Attachment C. The results of soil analyses are as follows:
• TPHg was detected in 15 of the 94 samples analyzed for this constituent at concentrations ranging from 0.731 to 7,280 mg/kg. The highest concentrations were detected at depths of 15 to 20 feet in the former UST and fueling island areas (B17, B18, B20) with the highest concentration detected at location B20 at 20 feet. Except for one location at the former waste oil UST (B21) where TPHg was detected up to 2,420 mg/kg at 5 feet, TPHg was not detected in soils shallower than 15 feet.
• TPHd was detected in seven samples at concentrations ranging from 49.1 to 863 mg/kg with the highest concentrations collocated with the highest TPHg detections. • TPHo was detected in one sample in the southwest corner of the Site, south of the former fueling island area, at a depth of 1 foot (B15-1) at a concentration of 988 mg/kg. • Benzene was detected above the reporting limit in 29 of 138 samples at relatively low concentrations, ranging from 1.02 to 4.15 micrograms per kilogram (µg/kg). Benzene was Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

primarily detected in select former parking areas and sporadically detected in the former UST, fueling island, and automotive repair areas.
• Ethylbenzene was detected in 19 samples at concentrations ranging from 1.23 to 115,000 µg/kg with the highest concentrations in the former UST and fueling island areas (B17, B18, B20) at depths of 15 to 20 feet, collocated with the highest TPHg detections. • Naphthalene was detected in 17 samples at concentrations ranging from 6.93 to 59,200 µg/kg.

The highest detected concentrations were encountered in the former UST and fueling island areas collocated with the highest TPHg and ethylbenzene detections. • Other petroleum-related VOCs including toluene, xylenes, isopropylbenzene, n-butylbenzene, n-propylbenzene, sec-butylbenzene, p-isopropyltoluene, and 1,2,4- and 1,3,5-trimethylbenzene were detected in samples in the former auto repair, fuel UST, and fueling island areas typically collocated with detected TPHg. • Acetone was detected in one sample east of the former waste oil UST (B25) at a concentration of 65.2 µg/kg.
• Methyl-tert-butyl ether (MTBE) was not detected in any of the soil samples. • The chlorinated solvent trichloroethene (TCE) was detected in two samples along the west side of the Site (B18 and B26) each at a depth of 20 feet. Detected concentrations at B18 and B26 were 3.13 and 1.51 µg/kg, respectively.
• PCE and other chlorinated VOCs were not detected.

3.3 Groundwater Analytical Results
Groundwater samples were collected along the southern Site boundary (GW1-GW5) and at and around the former UST, fueling island, and auto repair areas (GW13, GW15, GW19, GW20, GW24, GW26, GW49) and analyzed for TPH and VOCs. A total of 12 groundwater samples were obtained. TPH and VOC groundwater analytical results are presented in Tables 4 and 5 and Figures 6 and 7, respectively.

Groundwater analytical laboratory reports are included in Attachment C. The results of groundwater analyses are as follows:
• TPHg was detected in six of the 12 samples analyzed at concentrations ranging from 0.00632 to 1.140 mg/L. The highest concentration was detected in the northwestern portion of the former UST and fueling island area (GW19). Concentrations of 0.621 and 0.183 mg/L were detected at the former fuel UST (GW20) and other fueling island areas (GW49). • TPHd was detected in three of the 12 samples at concentrations ranging from 0.0859 to 0.346 mg/L with the highest concentrations collocated with the highest TPHg detections. • TPHo was not detected in any of the groundwater samples. • Benzene was not detected in any of the groundwater samples. • Ethylbenzene was detected in three samples at concentrations ranging from 2.78 to 28.8 µg/L with the highest concentrations at the former fuel UST and fueling island areas(GW19, GW20, and GW49) and collocated with the TPHd and highest TPHg detections.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

• Naphthalene was detected in three samples at concentrations ranging from 1.80 to 13.8 µg/L.

Similar to ethylbenzene, naphthalene detections were collocated with the TPHd and highest TPHg detections.
• Other petroleum-related VOCs including toluene, xylenes, isopropylbenzene, n-propylbenzene, sec-butylbenzene, and 1,2,4- and 1,3,5-trimethylbenzene were detected in samples in the former fuel UST and fueling island areas typically collocated with detected TPHg and TPHd.
• Acetone was detected in one sample at the former fueling island area (GW49) at a concentration of 17.6 µg/L.
• MTBE was not detected in any of the groundwater samples. • TCE was detected in five samples at concentrations ranging from 1.32 to 15.8 µg/L with the highest concentration at the southwest corner of the Site (GW15). • PCE was detected in three samples at concentrations ranging from 0.590 to 1.45 µg/L with the highest concentrations along the southern Site boundary (GW1 and GW2). • Trichlorofluoromethane (Freon-11) and 1,1,2-trichloro-1,2,2-trifluoroethane (Freon-113) were detected in five and seven samples, respectively, at concentrations ranging from 0.610 to

1.63 µg/L. The highest concentrations of these compounds were detected along the southern Site boundary (GW1-GW5).

3.4 Soil Gas Analytical Results
Soil gas probes were installed in 48 of the 49 advanced boreholes across the entirety of the Site. A total of 93 soil gas samples were obtained. Soil gas analytical results are presented in Table 6 and Figures 8, 9, 10, and 11. Figures 8 and 9 also present 5- and 15-foot contours, respectively, for benzene and ethylbenzene. Benzene was contoured at a concentration of 100 micrograms per cubic meter (µg/m3), and ethylbenzene was contoured at concentrations of 1,000, 10,000, and 100,000 µg/m3. Figures 10 and 11 also present 5- and 15-foot contours, respectively, for PCE which was contoured at concentrations of 50, 100, 500, and 1,000 µg/m3. Soil gas analytical laboratory reports are included in Attachment D. The results of soil gas analyses are as follows:
• Benzene was detected in 83 of the 93 samples at concentrations ranging from 2.4 to 170 µg/m3.

Benzene was detected across the Site with slightly higher concentrations detected in the former UST and fueling island areas (up to 170 µg/m3; SG16, SG18, SG20, SG21) and lower concentrations across the remainer of the Site (up to 95 µg/m3). • Ethylbenzene was detected in 35 samples at concentrations ranging from 4.7 to 260,000 µg/m3 with the highest concentrations in the former fuel UST and fueling island areas and typically occurring in the deeper, 15-foot samples (up to 260,000 µg/m3) and lower concentrations across the remainer of the Site (up to 45 µg/m3).
• Toluene and total xylenes were detected in numerous samples at concentrations ranging up to 81,000 and 450,000 µg/m3, respectively, and following similar concentration distribution patterns to benzene and ethylbenzene.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

• Naphthalene was detected in one sample in the former UST area (SG20) at a concentration of 2,500 µg/m3at a depth of 15 feet.
• Other petroleum-related VOCs including n-butylbenzene, n-propylbenzene, sec-butylbenzene, acetone, tert-butylbenzene, 4-methyl-2-pentanone, and 1,2,4- and 1,3,5-trimethylbenzene were detected in soil gas samples with the highest concentrations in the former UST and fueling island areas.
• MTBE was not detected in any of the soil gas samples. • TCE was detected in five samples collected at concentrations ranging from 6.9 to 32 µg/m3 with the highest concentration in the southwest portion of the Site (SG24). • PCE was detected in 77 samples collected at concentrations ranging from 4.4 to 1,400 µg/m3 with the highest concentrations along the southern Site boundary (SG2, SG3, SG7). • Chloroform was detected at two locations in the northwest portion of the Site (SG37 and SG38) at concentrations of 13 and 35 µg/m3.
• Freon-11 and Freon-113 were detected in 43 and 59 samples, respectively, at concentrations ranging from 7.5 to 600 µg/m3. The highest concentrations of these compounds were detected along the southern Site boundary and in the parking areas. • 1,1,1-Trichloroethane was detected at one location along the southern Site boundary (SG3) at a concentration of 18 µg/m3.

3.5 Data Assessment
Data management and QA/QC procedures were implemented during the investigation without significant upset conditions. Such procedures were implemented as part of the field sampling and analytical laboratory testing as described in the SA-RWQCB-approved Work Plan to ensure that data of known quality were produced, and that the quality of the results was improved to the maximum extent during the investigation. Analytical laboratories performing the analytical testing did so following the Work Plan and under laboratory internal QA/QC guidelines.

As part of this multi-media environmental assessment at the Site, the following field quality control samples were collected: 14 field duplicates (six soil, seven soil gas, and one groundwater), five equipment blank samples, and nine trip blanks. Laboratory quality control samples included reagent blanks, laboratory control samples, and surrogate spikes for groundwater analysis, and method blanks, laboratory duplicate samples, and laboratory control samples.

Primary sample results were compared to duplicate sample results for the target analytes PCE, TCE, benzene, ethylbenzene, and TPHg. Precision is assessed through relative percent differences (RPDs).

Calculated RPDs ranged from zero to 21.2 percent, below the precision goals of less than or equal to 40 percent or 30 percent for non-aqueous and aqueous media samples, respectively.

Based on review and analysis of QA/QC procedures and samples, no data obtained during the work described herein warranted rejection. The data relied upon is considered technically defensible and useable for decision making purposes.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

4.0 DISCUSSION

4.1 Soil
• A total of 156 soil samples were collected and analyzed for VOCs and/or TPH from across the Site.
• TPHg was detected in 15 of the analyzed samples. Concentrations detected at four locations (B17, B18, B20, and B21) exceeded one or more of the Region 2 Regional Water Quality Control Board Environmental Soil Direct Exposure Environmental Screening Levels for residential (ESL-R; 430 mg/kg), commercial/industrial (ESL-C/I; 2,000 mg/kg), or construction worker (ESL-CW; 1,800 mg/kg) receptors. Of these exceedances, only one occurred at a depth of less than 10 feet (B21-5 at 2,420 mg/kg). • TPHd was detected in seven of the analyzed samples. Concentrations at three locations (B17, B18, and B20) exceeded the ESL-R of 260 mg/kg. However, none of these exceedances occurred shallower than 15 feet and based on the lack of a complete pathway are not considered an exposure risk during Site development or future Site occupation. TPHd concentrations did not exceed the ESL-C/I or ESL-CW (1,200 and 1,100 mg/kg, respectively). • TPHo was detected in a single sample (B15-1) at a concentration (988 mg/kg) below the ESL-R, ESL-C/I, and ESL-CW (12,000, 180,000, and 54,000, respectively). • Detected benzene concentrations did not exceed ESLs.
• Ethylbenzene was detected in 19 of the analyzed samples at concentrations up to 115,000 µg/kg. Similar to TPHg, concentrations exceeding the ESL-R (5,900 µg/kg) and ESL-C/I (26,000 µg/kg) typically occurred at depths of 15 to 20 feet in the former UST and fueling island areas, and only one of these exceedances occurred at a depth of less than 10 feet (B21-5 at 10,400 µg/kg). Detected ethylbenzene concentrations did not exceed the ESL-CW (540,000 µg/kg).
• Naphthalene was detected in 17 samples at concentrations up to 59,200 µg/kg. Concentrations exceeding the ESL-R (3,800 µg/kg) and ESL-C/I (17,000 µg/kg) were typically collocated with ethylbenzene exceedances and, except for B21-5, occurred at depths greater than 10 feet.

Detected naphthalene concentrations did not exceed the ESL-CW (400,000 µg/kg). • Except for xylenes in two deeper samples (B17-20 and B20-20), other VOCs did not exceed their respective ESLs.

4.2 Groundwater
• A total of 12 groundwater samples were collected and analyzed for TPH and VOCs targeting the southern Site boundary (GW1-GW5), the former UST, fueling island, and auto repair areas (GW19, GW20, GW24, GW26, GW49), and nearby locations (GW13, GW15). • No indications of free phase hydrocarbons were observed. • TPHg and TPHd were detected at concentrations up to 1.14 and 0.346 mg/L, respectively.

These detections are considered trace concentrations and are insignificant.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

• Neither benzene nor MTBE were detected in any of the groundwater samples. • Naphthalene and xylenes were detected at concentrations up to 12.7 and up to 128 µg/L, respectively, in GW20 located in the center of the former UST area. While these concentrations exceed their respective Maximum Contaminant Levels (MCLs) in drinking water of 0.17 and 20 µg/L, naphthalene concentrations decreased an order of magnitude or to non-detect at the down-gradient locations GW19 and GW26 and xylenes were not detected in the down-gradient samples.
• TCE was detected at concentrations up to 15.8 µg/L. The highest detection was at the southwest corner of the Site (GW15) which is in a parking area cross-gradient from the former UST and fueling area and only downgradient from off-Site properties. Two detections, 15.8 µg/L at GW15 and 6.71 µg/L at GW49 exceeded the MCL of 5.0 µg/L. Based on the lack of historical operations at this area, lack of historical TCE use at the Site, and groundwater flow direction, this exceedance is believed to be related to a groundwater plume associated with the off-Site Crown Cleaners property at 5190 Arlington Avenue.
• No other VOCs were detected in groundwater exceeding their respective MCLs, including PCE

4.3 Soil Gas
• A total of 93 soil gas samples were collected and analyzed for VOCs from across the Site. • Benzene was detected in 83 samples collected at concentrations up to 170 µg/m3. Ethylbenzene was detected in 35 samples at concentrations up to 260,000 µg/m3. Naphthalene was detected in one sample at a concentration of 2,500 µg/m3. Where concentrations exceeded the soil gas screening levels for benzene, ethylbenzene, and naphthalene without a bioattenuation zone as defined in Appendix 4 of the California State Water Resources Control Board (SWRCB) LowThreat Underground Storage Tank Case Closure Policy (LTCP) (85, 1,100, and 93 µg/m3 ,
respectively), shallow soil samples were analyzed for TPH and soil gas samples were analyzed for oxygen to determine the presence or absence of a bioattenuation zone. Except for location SG21, soil TPH and soil gas oxygen concentrations demonstrated that a bioattenuation zone was present at the target locations. Benzene, ethylbenzene, and naphthalene concentrations did not exceed the soil gas screening levels published in the LTCP with a bioattenuation zone present (85,000, 1,100,000, and 93,000 µg/m3, respectively). At location SG21, benzene and ethylbenzene exceed the LTCP published screening levels assuming a bioattenuation zone is not present.
• Xylenes were detected in 58 samples collected at concentrations up to 450,000 µg/m3. Toluene was detected in 72 samples collected at concentrations up to 81,000 µg/m3. Concentrations of these chemicals exceeding ESL-Rs (3,500 and 10,000 µg/m3, respectively) and ESL-C/Is (15,000 and 44,000 µg/m3, respectively) occurred within the former UST and fueling island area (SG16, SG17, SG18, SG20) and typically at a depth of 15 feet. Xylenes concentrations exceeded the ESLs at 5 feet at locations SG16, SG17, and SG18, however, at generally lower concentrations than what was detected at 15 feet.
• TCE was detected in five samples collected at concentrations up to 32 µg/m3. TCE concentrations slightly exceeded the ESL-R (16 µg/m3) at two locations (SG24 and SG26).

Detected TCE concentrations did not exceed the ESL-C/I (100 µg/m3).

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

• PCE was detected in 77 samples collected at concentrations up to 1,400 µg/m3. Concentrations exceeded the ESL-R (15 µg/m3; 65 of the 77 detections) across the Site. Concentrations exceeding the ESL-C/I (67 µg/m3; 30 of the 77 detections) were typically observed in the southern and northwestern portions of the Site with the highest concentrations occurring along the southern Site boundary.
• Chloroform was detected in two samples collected at concentrations up to 35 µg/m3.

Chloroform concentrations slightly exceeded the ESL-R (4.1 µg/m3) and, at one location in the northwest parking area (SG38), exceeded the ESL-C/I (18 µg/m3). The two chloroform detections were collocated with elevated PCE detections.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

5.0 CONCLUSIONS AND RECOMMEDNATIONS
Conclusions of this assessment are as follows:
• With the exception of some staining and odors indicative of petroleum hydrocarbons in a limited area of the Site (former UST area), no suspect soil conditions were noted during the assessment work. The residual petroleum impacts were noted at depths of 15 to 30 feet in just a few of the 49 borings drilled at the Site. Soil at these depths will not be encountered during future grading activities. At one of the boring locations (B21/SG21; near the former UST and fueling island area), stained and odorous soil was observed at depths of 5 and 10 feet. • No indications of chemical releases were noted in any other areas of the Site (outside of the former UST and fueling island areas).
• Low concentrations of TPHg and TPHd were detected in six of the groundwater samples collected proximate to the former UST and fueling island areas. No benzene or MTBE (primary VOCs of concern at UST release locations as referenced in the LTCP) were detected in the groundwater samples.
• There are no indications that free product is present at the Site, and free product was not observed during subsurface investigation activities.
• PCE was detected in three of the groundwater samples at concentrations below the MCL (drinking water standard). These locations are situated hydraulically downgradient (northwest) of a known chlorinated solvent release location (Crown Cleaners - 5190 Arlington Avenue).

The release location is situated at distances ranging from approximately 650 to 950 feet from various locations along the southern Site boundary. Other groundwater samples further downgradient from the drycleaners in the southwest portion of the Site contain TCE, a PCE breakdown product. Other chlorinated VOCs detected in groundwater at the Site that are consistent with the solvent release at 5190 Arlington Avenue include Freon-11 and Freon-113.

Based on the absence of PCE in on-Site soil samples, lack of substantial TCE detected in vadose zone soil, and lack of historical chlorinated solvent use at the Site, it is inferred that the presence of chlorinated solvents in groundwater at the Site resulted from the off-Site release at the drycleaners facility to the south and southeast of the Site. The drycleaning property is currently under the environmental oversight of the California DTSC (Site Code 401875 – Crown Cleaners/Heritage Plaza). Recent assessment was completed at this property in early 2023 and at this time, remedial actions pertaining to vapor intrusion considerations are being evaluated.
• Several VOCs were detected in soil gas samples obtained throughout the Site. As anticipated, the highest concentrations of petroleum-related VOCs were detected in and around the former UST system area. Benzene, ethylbenzene, and naphthalene are the primary VOCs of concern at UST release locations as referenced in the LTCP. Detected concentrations of benzene, ethylbenzene, and naphthalene are below both residential and commercial human health riskbased screening levels as published in the LTCP, except for location SG21 where the presence of a bio attenuation zone could not be demonstrated.
• PCE is prevalent in soil gas throughout the Site. The highest PCE concentrations are along its southern boundary and typically in the deeper, 15-foot samples, further supporting the Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

conclusion that Site impacts are associated with historical chlorinated solvent releases at 5190 Arlington Avenue. A few TCE detections were also noted in soil gas. Other prevalent chlorinated VOCs detected in soil gas at the Site that are consistent with the solvent release at 5190 Arlington Avenue include Freon-11, Freon-113 and chloroform. Similar to groundwater impacts, it is inferred that the presence of chlorinated solvents in soil gas throughout the Site resulted from the off-Site release at the drycleaners facility to the south and southeast of the Site.
• A total of 14 field duplicate samples, five equipment blanks, and nine trip blank samples were collected during this assessment. Data quality standards as described in the Work Plan and Section 3.5 were met.

Our recommendations are as follows:
• Removal of petroleum impacted soil at location B21/SG21 is recommended to a depth of 10 feet. The amount of soil in this area is anticipated to be limited in quantity relative to the overall volume of soil to be displaced during future Site grading activities. The petroleum impacted soil can be handled and mitigated in accordance with a South Coast Air Quality Management District (SCAQMD) Rule 1166 (VOC Emissions from Decontamination of Soil) Mitigation Plan. Segregation of the petroleum-impacted soil can be completed using conventional soil management practices and concurrent with Site development. • Other residual petroleum soil impacts at greater depths in the former UST and fueling island areas are recommended to remain undisturbed as they will not be encountered during construction and represent a negligible exposure risk to future Site occupants. • Vapor mitigation measures are recommended to be incorporated into the future foundation design of new structures to be constructed at the Site. This is primarily due to the presence of PCE in soil gas at the Site which has resulted from an off-Site source. Vapor mitigation systems are anticipated to include conventional vapor barriers with passive sub-slab venting.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

6.0 REQUEST FOR NO FURTHER ASSESSMENT
By way of this report, we are requesting SA-RWQCB concurrence with our opinion that no further assessment for the Former Sears Retail Site (Global ID T10000018601) is required to prepare the Site for future development. At the request of the SA-RWQCB, future soil management related documents (i.e., SCAQMD Rule 1166 Mitigation Plan) and vapor intrusion mitigation system plans and specifications can be uploaded to the GeoTracker database, so that they are made available to the SARWQCB and the public.

Subsurface Assessment Report November 3, 2023
5261 Arlington Avenue, Riverside, CA

7.0 REFERENCES
California State Water Resources Control Board (SWRCB). 2012. Low-Threat UST Case Closure Policy. August 17.

San Francisco Bay (Region 2) Regional Water Quality Control Board. 2016. Environmental Screening Levels. Updated January 2019.

Santa Ana Regional Water Quality Control Board. 2023. Response to Work Plan for Subsurface Assessment for Former Sears Retail, 5261 Arlington Avenue, Riverside, California (Global ID # T10000018601). May 18.

Terracon Consultants, Inc. (Terracon). 2014. 1298 – Final Phase I ESA (12-18-14), Sears Store #1298 and Sears Auto Center #6711, 5261 Arlington Avenue, Riverside, Riverside County, California.

Terracon Project No. 81149324.1298. December 18.

Terracon. 2015. 1298 – Phase II ESA Report, Sears Store #1298 and Sears Auto Center #6711, 5261 Arlington Avenue, Riverside, Riverside County, California. Terracon Project No. 60159016.1298.

April 7.

USGS. 2018. Riverside West Quadrangle, California – Riverside County, 7.5-Minute Series. Version Date: January 1.

Weis Environmental, LLC. 2021. Work Plan for Subsurface Assessment, Former Sears Retail, 5261 Arlington Avenue, Riverside, California 92504. Global ID T10000018601. October 3.

FIGURES
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
SITE
Figure 1 - Vicinity Map
5261 Arlington Avenue
Riverside, California
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 2
Aerial Photograph
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Approximate Scale in Feet
0 100 200
Arlington Avenue
Auto Center
Bank of America
Sears Building
(Basement Throughout to be Backfilled)
Basement
to be
Backfilled
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 3
Site Plan
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
B47
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
B05
B04
B03
B02
B01
B06
B07
B08
B09
B10
B11
B31
B32
B33
B35
B42
B43
B47
B44 B36
B41
B12
B13
B14
B17
B19
B30
B29
B28
B27
B26
B38
B39
B40
B37 B45
B46
B34
B49
B16 B18
100-foot Grid
B20
B21
B22 B23
B24
B25
Sears Building
(Basement Throughout to be Backfilled)
Basement
to be
Backfilled
B15 B48
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 4
Soil TPH Results (mg/kg)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
B14 TPHg TPHd TPHo
B14-1 ND ND ND
B14-5 ND ND ND
B14-10 ND ND ND
B14-15 ND ND ND
B14-20 ND ND ND
B15 TPHg TPHd TPHo
B15-1 ND 49.1 988
B15-5 ND ND ND
B15-10 ND ND ND
B15-15 ND ND ND
B15-20 ND ND ND B16 TPHg TPHd TPHo
B16-1 ND ND ND
B16-5 ND ND ND
B16-10 ND ND ND
B16-15 ND ND ND
B16-20 ND ND ND
B16-25 2.14 ND ND
B16-30 0.776 ND ND
B16-35 ND ND ND
B16-40 ND ND ND
B17 TPHg TPHd TPHo
B17-1 ND ND ND
B17-5 ND ND ND
B17-10 ND ND ND
B17-15 2280 293 ND
B17-20 3420 63.9 ND
B17-25 2.10 ND ND
B17-30 377 ND ND
B17-35 ND ND ND
B17-40 ND ND ND
B18 TPHg TPHd TPHo
B18-1 ND ND ND
B18-5 ND ND ND
B18-10 ND ND ND
B18-15 3160 863 ND
B18-20 5.02 ND ND
B18-25 ND ND ND
B19 TPHg TPHd TPHo
B19-1 ND ND ND
B19-5 ND ND ND
B19-10 ND ND ND
B19-15 ND ND ND
B19-20 ND ND ND
B19-30 ND ND ND
B19-35 0.731 ND ND
B19-40 ND ND ND
B20 TPHg TPHd TPHo
B20-1 ND ND ND
B20-5 ND ND ND
B20-10 ND ND ND
B20-15 1830 412 ND
B20-20 7280 346 ND
B20-25 275 98.2 ND
B20-30 31.3 ND ND
B20-35 ND ND ND
B20-40 ND ND ND
B21 TPHg TPHd TPHo
B21-1 ND ND ND
B21-5 2420 ND ND
B21-10 553 ND ND
B21-15 ND ND ND
B21-20 ND ND ND
B21-25 ND ND ND
B22 TPHg TPHd TPHo
B22-1 ND ND ND
B22-5 ND ND ND
B22-10 ND ND ND
B22-15 ND ND ND
B22-20 ND ND ND
B23 TPHg TPHd TPHo
B23-1 ND ND ND
B23-5 ND ND ND
B23-10 ND ND ND
B23-15 ND ND ND
B23-20 ND ND ND
B24 TPHg TPHd TPHo
B24-1 ND ND ND
B24-5 ND ND ND
B24-10 ND ND ND
B24-15 ND ND ND
B24-20 ND ND ND
B25 TPHg TPHd TPHo
B25-1 ND ND ND
B25-5 ND ND ND
B25-10 ND ND ND
B25-15 ND ND ND
B25-20 ND ND ND
B26 TPHg TPHd TPHo
B26-1 ND ND ND
B26-5 ND ND ND
B26-10 ND ND ND
B26-15 ND ND ND
B26-20 ND ND ND
B27 TPHg TPHd TPHo
B27-1 ND ND ND
B27-5 ND ND ND
B27-10 ND ND ND
B27-15 ND ND ND
B27-20 ND ND ND
B28 TPHg TPHd TPHo
B28-1 ND ND ND
B28-5 ND ND ND
B29 TPHg TPHd TPHo
B29-1 ND ND ND
B29-5 ND ND ND
B30 TPHg TPHd TPHo
B30-1 ND ND ND
B30-5 ND ND ND
B32 TPHg TPHd TPHo
B32-1 ND ND ND
Sample Location not analyzed
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 5
Soil Benzene and
Ethylbenzene Results (µg/kg)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
B01 Benzene EthlyB
B01-5 1.77 J ND
B01-15 ND ND
B02 Benzene EthlyB
B02-5 1.44 J ND
B02-15 ND ND
B03 Benzene EthlyB
B03-5 2.59 J ND
B03-13 ND ND
B04 Benzene EthlyB
B04-5 ND ND
B04-15 ND ND
B05 Benzene EthlyB
B05-5 1.42 J ND
B05-15 ND ND
B06 Benzene EthlyB
B06-5 3.01 J ND
B06-15 ND ND
B07 Benzene EthlyB
B07-5 4.15 J ND
B07-15 ND ND
B08 Benzene EthlyB
B08-5 1.48 J ND
B08-15 ND ND
B09 Benzene EthlyB
B09-5 2.25 J ND
B09-15 ND ND
B10 Benzene EthlyB
B10-5 1.37 J ND
B10-15 ND ND
B11 Benzene EthlyB
B11-5 1.20 J ND
B11-15 ND ND
B12 Benzene EthlyB
B12-5 1.40 J ND
B12-15 ND ND
B13 Benzene EthlyB
B13-5 ND ND
B13-15 3.12 J ND
B14 Benzene EthlyB
B14-5 ND ND
B14-10 ND ND
B14-15 ND ND
B14-20 ND 14.3
B15 Benzene EthlyB
B15-5 1.97 J ND
B15-10 ND ND
B15-15 ND ND
B15-20 ND ND
B16 Benzene EthlyB
B16-5 ND ND
B16-10 ND ND
B16-15 ND ND
B16-20 ND 11.1
B16-25 ND 128
B16-30 ND 28.9
B16-35 ND ND
B16-40 ND ND
B17 Benzene EthlyB
B17-5 ND ND
B17-10 ND ND
B17-15 ND 3300 J
B17-20 ND 108000
B17-25 ND ND
B17-30 ND 5370
B17-35 ND ND
B17-40 ND 2.92 J
B18 Benzene EthlyB
B18-5 ND ND
B18-10 ND ND
B18-15 ND 26700
B18-20 ND 20.4
B18-25 ND 3.09 J
B19 Benzene EthlyB
B19-5 ND ND
B19-10 ND ND
B19-15 ND ND
B19-20 ND ND
B19-30 ND 1.23 J
B19-35 ND ND
B19-40 ND ND
B20 Benzene EthlyB
B20-5 1.70 J ND
B20-10 1.61 J ND
B20-15 ND 5210 J
B20-20 ND 115000
B20-25 ND 2450
B20-30 ND 911
B20-35 ND ND
B20-40 ND ND
B21 Benzene EthlyB
B21-5 ND 10400
B21-10 ND 751
B21-15 ND ND
B21-20 ND ND
B21-25 ND 6.44 J
B22 Benzene EthlyB
B22-5 ND ND
B22-10 ND ND
B22-15 ND ND
B22-20 ND ND
B23 Benzene EthlyB
B23-5 1.13 J ND
B23-10 1.99 J ND
B23-15 2.80 J ND
B23-20 ND ND
B24 Benzene EthlyB
B24-5 ND ND
B24-10 ND ND
B24-15 1.37 J ND
B24-20 ND ND
B25 Benzene EthlyB
B25-5 1.30 J ND
B25-10 ND ND
B25-15 ND ND
B25-20 ND ND
B26 Benzene EthlyB
B26-5 1.25 J ND
B26-10 ND ND
B26-15 ND ND
B26-20 1.50 J ND
B27 Benzene EthlyB
B27-5 ND ND
B27-10 ND ND
B27-15 ND ND
B27-20 ND ND
B28 Benzene EthlyB
B28-5 1.02 J ND
B29 Benzene EthlyB
B29-5 ND ND
B30 Benzene EthlyB
B30-5 2.01 J ND
B31 Benzene EthlyB
B31-5 ND ND
B31-15 ND ND
B32 Benzene EthlyB
B32-5 ND ND
B32-15 ND ND
B33 Benzene EthlyB
B33-5 ND ND
B33-15 ND ND
B34 Benzene EthlyB
B34-5 ND ND
B34-15 ND ND
B35 Benzene EthlyB
B35-5 ND ND
B35-15 ND ND
B36 Benzene EthlyB
B36-5 ND ND
B36-15 ND ND
B37 Benzene EthlyB
B37-5 1.38 J ND
B37-15 1.77 J ND
B38 Benzene EthlyB
B38-5 ND ND
B38-15 ND ND
B39 Benzene EthlyB
B39-5 ND ND
B39-15 ND ND
B40 Benzene EthlyB
B40-5 ND ND
B40-15 ND ND
B41 Benzene EthlyB
B41-5 ND ND
B41-15 ND ND
B42 Benzene EthlyB
B42-5 ND ND
B42-15 ND ND
B43 Benzene EthlyB
B43-5 ND ND
B43-15 ND ND
B47 Benzene EthlyB
B47-5 ND ND
B47-15 ND ND
B44 Benzene EthlyB
B44-5 ND ND
B44-15 2.23 J ND
B45 Benzene EthlyB
B45-5 ND ND
B45-15 ND ND
B46 Benzene EthlyB
B46-5 ND ND
B46-15 1.95 J ND
B48 Benzene EthlyB
B48-5 ND ND
B48-15 2.58 J ND
Sample Location not analyzed
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 6
Groundwater TPH Results
(mg/L)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
GW1 TPHg TPHd TPHo

ND ND ND
GW2 TPHg TPHd TPHo Sample Location not analyzed

ND ND ND
GW4 TPHg TPHd TPHo

ND ND ND
GW3 TPHg TPHd TPHo

ND ND ND
GW5 TPHg TPHd TPHo

ND ND ND
GW13 TPHg TPHd TPHo

0.00705 ND ND
GW15 TPHg TPHd TPHo

0.00632 ND ND
GW19 TPHg TPHd TPHo

1.14 0.346 ND
GW20 TPHg TPHd TPHo

0.621 0.0859 ND
GW24 TPHg TPHd TPHo

0.00904 ND ND
GW26 TPHg TPHd TPHo

ND ND ND
GW49 TPHg TPHd TPHo

0.183 0.116 ND
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 7
Groundwater VOC Results
(µg/L)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
GW1 PCE TCE Benzene EthlyB Nap

1.45 ND ND ND ND
GW2 PCE TCE Benzene EthlyB Nap Sample Location not analyzed

0.810 J ND ND ND ND
GW4 PCE TCE Benzene EthlyB Nap

ND ND ND ND ND
GW3 PCE TCE Benzene EthlyB Nap

ND ND ND ND ND
GW5 PCE TCE Benzene EthlyB Nap

ND ND ND ND ND
GW13 PCE TCE Benzene EthlyB Nap

0.590 J ND ND ND ND
GW15 PCE TCE Benzene EthlyB Nap
ND 15.8 ND ND ND
GW19 PCE TCE Benzene EthlyB Nap
ND 1.32 ND 2.78 1.80
GW20 PCE TCE Benzene EthlyB Nap
ND 3.03 ND 28.8 12.7
GW24 PCE TCE Benzene EthlyB Nap

ND ND ND ND ND
GW26 PCE TCE Benzene EthlyB Nap
ND 2.67 ND ND ND
GW49 PCE TCE Benzene EthlyB Nap
ND 6.71 ND 17.5 13.8
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 8
Soil Gas Benzene and
Ethylbenzene Results with
5-Foot Contours (µg/m3)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
SG1 Benzene EthlyB
SG1-5 12 9.6
SG1-15 15 ND
SG2 Benzene EthlyB
SG2-5 48 ND
SG2-15 33 ND
SG3 Benzene EthlyB
SG3-5 18 ND
SG3-15 17 ND
SG4 Benzene EthlyB
SG4-5 10 5.8
SG4-15 26 8.8
SG5 Benzene EthlyB
SG5-5 13 6.5
SG5-15 37 16
SG6 Benzene EthlyB
SG6-5 23 17
SG6-15 16 4.7
SG7 Benzene EthlyB
SG7-5 19 ND
SG7-15 13 ND
SG8 Benzene EthlyB
SG8-5 23 12
SG8-15 14 6.1
SG9 Benzene EthlyB
SG9-5 56 ND
SG9-15 19 ND
SG10 Benzene EthlyB
SG10-5 33 38
SG10-15 24 21
SG11 Benzene EthlyB
SG11-5 47 37
SG11-15 31 45
SG12 Benzene EthlyB
SG12-5 37 ND
SG12-15 8.1 ND
SG13 Benzene EthlyB
SG13-5 38 8.2
SG13-15 ND ND
SG14 Benzene EthlyB
SG14-5 ND ND
SG14-15 ND 9800
SG15 Benzene EthlyB
SG15-5 50 ND
SG15-15 43 25
SG16 Benzene EthlyB
SG16-5 130 16000
SG16-15 37 7400
SG17 Benzene EthlyB
SG17-5 69 2100
SG17-15 ND 53000
SG18 Benzene EthlyB
SG18-5 80 12000
SG18-15 170 260000
SG19 Benzene EthlyB
SG19-5 97 1300
SG19-15 2.4 190
SG20 Benzene EthlyB
SG20-5 120 2200
SG20-15 ND 130000
SG21 Benzene EthlyB
SG21-5 150 3800
SG21-15 ND 960
SG22 Benzene EthlyB
SG22-5 13 9.4
SG22-15 39 8.4
SG23 Benzene EthlyB
SG23-5 27 ND
SG23-15 33 ND
SG24 Benzene EthlyB
SG24-5 5.5 ND
SG24-15 9.1 ND
SG25 Benzene EthlyB
SG25-5 ND ND
SG25-15 95 ND
SG26 Benzene EthlyB
SG26-5 19 ND
SG26-15 13 ND
SG27 Benzene EthlyB
SG27-5 91 ND
SG27-15 60 ND
SG28 Benzene EthlyB
SG28-5 ND ND
SG29 Benzene EthlyB
SG29-5 ND ND
SG30 Benzene EthlyB
SG30-5 ND ND
SG31 Benzene EthlyB
SG31-5 74 ND
SG31-15 23 9.1
SG32 Benzene EthlyB
SG32-5 95 ND
SG32-15 19 ND
SG33 Benzene EthlyB
SG33-5 54 ND
SG33-15 22 ND
SG34 Benzene EthlyB
SG34-5 55 ND
SG34-15 31 ND
SG35 Benzene EthlyB
SG35-5 42 ND
SG35-15 43 ND
SG36 Benzene EthlyB
SG36-5 27 ND
SG36-15 15 ND
SG37 Benzene EthlyB
SG37-5 18 ND
SG37-15 29 ND
SG38 Benzene EthlyB
SG38-5 54 ND
SG38-15 28 ND
SG39 Benzene EthlyB
SG39-5 15 6.8
SG39-15 18 ND
SG40 Benzene EthlyB
SG40-5 36 ND
SG40-15 14 ND
SG41 Benzene EthlyB
SG41-5 24 ND
SG41-15 28 ND
SG42 Benzene EthlyB
SG42-5 45 ND
SG42-15 21 ND
SG43 Benzene EthlyB
SG43-5 52 ND
SG43-15 11 ND
SG47 Benzene EthlyB
SG47-5 28 22
SG47-15 24 9.7
SG44 Benzene EthlyB
SG44-5 42 20
SG44-15 13 ND
SG45 Benzene EthlyB
SG45-5 39 ND
SG45-15 44 ND
SG46 Benzene EthlyB
SG46-5 21 ND
SG46-15 25 ND
SG48 Benzene EthlyB
SG48-5 16 ND
SG48-15 18 ND
Sample Location not analyzed
Benzene Contour in µg/m3
100
Ethylbenzene Contour in µg/m3
100
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 9
Soil Gas Benzene and
Ethylbenzene Results with
15-Foot Contours (µg/m3)
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
Sears Building
SG1 Benzene EthlyB
SG1-5 12 9.6
SG1-15 15 ND
SG2 Benzene EthlyB
SG2-5 48 ND
SG2-15 33 ND
SG3 Benzene EthlyB
SG3-5 18 ND
SG3-15 17 ND
SG4 Benzene EthlyB
SG4-5 10 5.8
SG4-15 26 8.8
SG5 Benzene EthlyB
SG5-5 13 6.5
SG5-15 37 16
SG6 Benzene EthlyB
SG6-5 23 17
SG6-15 16 4.7
SG7 Benzene EthlyB
SG7-5 19 ND
SG7-15 13 ND
SG8 Benzene EthlyB
SG8-5 23 12
SG8-15 14 6.1
SG9 Benzene EthlyB
SG9-5 56 ND
SG9-15 19 ND
SG10 Benzene EthlyB
SG10-5 33 38
SG10-15 24 21
SG11 Benzene EthlyB
SG11-5 47 37
SG11-15 31 45
SG12 Benzene EthlyB
SG12-5 37 ND
SG12-15 8.1 ND
SG13 Benzene EthlyB
SG13-5 38 8.2
SG13-15 ND ND
SG14 Benzene EthlyB
SG14-5 ND ND
SG14-15 ND 9800
SG15 Benzene EthlyB
SG15-5 50 ND
SG15-15 43 25
SG16 Benzene EthlyB
SG16-5 130 16000
SG16-15 37 7400
SG17 Benzene EthlyB
SG17-5 69 2100
SG17-15 ND 53000
SG18 Benzene EthlyB
SG18-5 80 12000
SG18-15 170 260000
SG19 Benzene EthlyB
SG19-5 97 1300
SG19-15 2.4 190
SG20 Benzene EthlyB
SG20-5 120 2200
SG20-15 ND 130000
SG21 Benzene EthlyB
SG21-5 150 3800
SG21-15 ND 960
SG22 Benzene EthlyB
SG22-5 13 9.4
SG22-15 39 8.4
SG23 Benzene EthlyB
SG23-5 27 ND
SG23-15 33 ND
SG24 Benzene EthlyB
SG24-5 5.5 ND
SG24-15 9.1 ND
SG25 Benzene EthlyB
SG25-5 ND ND
SG25-15 95 ND
SG26 Benzene EthlyB
SG26-5 19 ND
SG26-15 13 ND
SG27 Benzene EthlyB
SG27-5 91 ND
SG27-15 60 ND
SG28 Benzene EthlyB
SG28-5 ND ND
SG29 Benzene EthlyB
SG29-5 ND ND
SG30 Benzene EthlyB
SG30-5 ND ND
SG31 Benzene EthlyB
SG31-5 74 ND
SG31-15 23 9.1
SG32 Benzene EthlyB
SG32-5 95 ND
SG32-15 19 ND
SG33 Benzene EthlyB
SG33-5 54 ND
SG33-15 22 ND
SG34 Benzene EthlyB
SG34-5 55 ND
SG34-15 31 ND
SG35 Benzene EthlyB
SG35-5 42 ND
SG35-15 43 ND
SG36 Benzene EthlyB
SG36-5 27 ND
SG36-15 15 ND
SG37 Benzene EthlyB
SG37-5 18 ND
SG37-15 29 ND
SG38 Benzene EthlyB
SG38-5 54 ND
SG38-15 28 ND
SG39 Benzene EthlyB
SG39-5 15 6.8
SG39-15 18 ND
SG40 Benzene EthlyB
SG40-5 36 ND
SG40-15 14 ND
SG41 Benzene EthlyB
SG41-5 24 ND
SG41-15 28 ND
SG42 Benzene EthlyB
SG42-5 45 ND
SG42-15 21 ND
SG43 Benzene EthlyB
SG43-5 52 ND
SG43-15 11 ND
SG47 Benzene EthlyB
SG47-5 28 22
SG47-15 24 9.7
SG44 Benzene EthlyB
SG44-5 42 20
SG44-15 13 ND
SG45 Benzene EthlyB
SG45-5 39 ND
SG45-15 44 ND
SG46 Benzene EthlyB
SG46-5 21 ND
SG46-15 25 ND
SG48 Benzene EthlyB
SG48-5 16 ND
SG48-15 18 ND
Sample Location not analyzed
Benzene Contour in µg/m3
100
Ethylbenzene Contour in µg/m3
100
Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 10
Soil Gas PCE and TCE
Results (µg/m3) with PCE (5
Foot) Contours
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Site Boundary
Current Structures
Approximate Scale in Feet
0 100 200
Former UST and Fuel
Dispenser Locations
Sample Location
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
5-foot PCE Contours in µg/m3
B20
Sears Building
SG1 PCE TCE
SG1-5 22 ND
SG1-15 390 ND
SG2 PCE TCE
SG2-5 150 ND
SG2-15 1300 ND
SG3 PCE TCE
SG3-5 810 ND
SG3-15 1100 ND
SG4 PCE TCE
SG4-5 250 ND
SG4-15 270 ND
SG5 PCE TCE
SG5-5 63 ND
SG5-15 28 ND SG6 PCE TCE
SG6-5 94 ND
SG6-15 150 ND
SG7 PCE TCE
SG7-5 710 ND
SG7-15 1400 ND
SG8 PCE TCE
SG8-5 100 ND
SG8-15 530 ND
SG9 PCE TCE
SG9-5 36 ND
SG9-15 710 ND
SG10 PCE TCE
SG10-5 130 ND
SG10-15 100 ND
SG11 PCE TCE
SG11-5 8.9 ND
SG11-15 19 ND
SG12 PCE TCE
SG12-5 170 ND
SG12-15 250 ND
SG13 PCE TCE
SG13-5 27 ND
SG13-15 80 ND
SG14 PCE TCE
SG14-5 ND ND
SG14-15 ND ND
SG15 PCE TCE
SG15-5 ND ND
SG15-15 4.6 ND
SG16 PCE TCE
SG16-5 ND ND
SG16-15 ND ND
SG17 PCE TCE
SG17-5 ND ND
SG17-15 ND ND
SG18 PCE TCE
SG18-5 ND ND
SG18-15 ND ND
SG19 PCE TCE
SG19-5 ND ND
SG19-15 ND ND
SG20 PCE TCE
SG20-5 27 ND
SG20-15 ND ND
SG21 PCE TCE
SG21-5 ND ND
SG21-15 ND ND
SG22 PCE TCE
SG22-5 ND ND
SG22-15 10 ND
SG23 PCE TCE
SG23-5 8.4 ND
SG23-15 12 ND
SG24 PCE TCE
SG24-5 14 29
SG24-15 180 32
SG25 PCE TCE
SG25-5 26 ND
SG25-15 16 ND
SG26 PCE TCE
SG26-5 39 17
SG26-15 49 29
SG27 PCE TCE
SG27-5 4.4 ND
SG27-15 19 ND
SG28 PCE TCE
SG28-5 54 ND
SG29 PCE TCE
SG29-5 52 ND
SG30 PCE TCE
SG30-5 57 ND
SG31 PCE TCE
SG31-5 ND ND
SG31-15 22 ND
SG32 PCE TCE
SG32-5 64 ND
SG32-15 21 ND
SG33 PCE TCE
SG33-5 46 ND
SG33-15 36 ND
SG34 PCE TCE
SG34-5 85 ND
SG34-15 67 ND
SG35 PCE TCE
SG35-5 65 ND
SG35-15 53 ND
SG36 PCE TCE
SG36-5 20 ND
SG36-15 18 ND
SG37 PCE TCE
SG37-5 75 ND
SG37-15 11 ND
SG38 PCE TCE
SG38-5 180 ND
SG38-15 290 ND
SG39 PCE TCE
SG39-5 230 ND
SG39-15 260 ND
SG40 PCE TCE
SG40-5 57 ND
SG40-15 140 6.9
SG41 PCE TCE
SG41-5 28 ND
SG41-15 16 ND
SG42 PCE TCE
SG42-5 82 ND
SG42-15 26 ND
SG43 PCE TCE
SG43-5 40 ND
SG43-15 11 ND
SG47 PCE TCE
SG47-5 11 ND
SG47-15 49 ND
SG44 PCE TCE
SG44-5 15 ND
SG44-15 13 ND
SG45 PCE TCE
SG45-5 39 ND
SG45-15 56 ND
SG46 PCE TCE
SG46-5 16 ND
SG46-15 11 ND
SG48 PCE TCE
SG48-5 64 ND
SG48-15 73 ND
Sample Location not analyzed
100
100
100
500
500
50 50
50 50
50 50
100
100
Note: Samples SG28-5, SG29-5, and
SG30-5 were collected at 5 feet beneath
a basement level. As such, sample results
are considered in the 15-foot contours
rather than the 5-foot.

Prepared by:

Weis Environmental
1938 Kellogg Avenue, Suite 116
Carlsbad, CA 92008
(760) 585-7070
Figure 11
Soil Gas PCE and TCE
Results (µg/m3) with PCE (15
Foot) Contours
5261 Arlington Avenue
Riverside, CA 92504
Streeter Avenue
Approximate Scale in Feet
0 100 200
Arlington Avenue
Commercial
Residential
Residential
Residential
Auto Center
Bank of America
B20
Sears Building
SG1 PCE TCE
SG1-5 22 ND
SG1-15 390 ND
SG2 PCE TCE
SG2-5 150 ND
SG2-15 1300 ND
SG3 PCE TCE
SG3-5 810 ND
SG3-15 1100 ND
SG4 PCE TCE
SG4-5 250 ND
SG4-15 270 ND
SG5 PCE TCE
SG5-5 63 ND
SG5-15 28 ND SG6 PCE TCE
SG6-5 94 ND
SG6-15 150 ND
SG7 PCE TCE
SG7-5 710 ND
SG7-15 1400 ND
SG8 PCE TCE
SG8-5 100 ND
SG8-15 530 ND
SG9 PCE TCE
SG9-5 36 ND
SG9-15 710 ND
SG10 PCE TCE
SG10-5 130 ND
SG10-15 100 ND
SG11 PCE TCE
SG11-5 8.9 ND
SG11-15 19 ND
SG12 PCE TCE
SG12-5 170 ND
SG12-15 250 ND
SG13 PCE TCE
SG13-5 27 ND
SG13-15 80 ND
SG14 PCE TCE
SG14-5 ND ND
SG14-15 ND ND
SG15 PCE TCE
SG15-5 ND ND
SG15-15 4.6 ND
SG16 PCE TCE
SG16-5 ND ND
SG16-15 ND ND
SG17 PCE TCE
SG17-5 ND ND
SG17-15 ND ND
SG18 PCE TCE
SG18-5 ND ND
SG18-15 ND ND
SG19 PCE TCE
SG19-5 ND ND
SG19-15 ND ND
SG20 PCE TCE
SG20-5 27 ND
SG20-15 ND ND
SG21 PCE TCE
SG21-5 ND ND
SG21-15 ND ND
SG22 PCE TCE
SG22-5 ND ND
SG22-15 10 ND
SG23 PCE TCE
SG23-5 8.4 ND
SG23-15 12 ND
SG24 PCE TCE
SG24-5 14 29
SG24-15 180 32
SG25 PCE TCE
SG25-5 26 ND
SG25-15 16 ND
SG26 PCE TCE
SG26-5 39 17
SG26-15 49 29
SG27 PCE TCE
SG27-5 4.4 ND
SG27-15 19 ND
SG28 PCE TCE
SG28-5 54 ND
SG29 PCE TCE
SG29-5 52 ND
SG30 PCE TCE
SG30-5 57 ND
SG31 PCE TCE
SG31-5 ND ND
SG31-15 22 ND
SG32 PCE TCE
SG32-5 64 ND
SG32-15 21 ND
SG33 PCE TCE
SG33-5 46 ND
SG33-15 36 ND
SG34 PCE TCE
SG34-5 85 ND
SG34-15 67 ND
SG35 PCE TCE
SG35-5 65 ND
SG35-15 53 ND
SG36 PCE TCE
SG36-5 20 ND
SG36-15 18 ND
SG37 PCE TCE
SG37-5 75 ND
SG37-15 11 ND
SG38 PCE TCE
SG38-5 180 ND
SG38-15 290 ND
SG39 PCE TCE
SG39-5 230 ND
SG39-15 260 ND
SG40 PCE TCE
SG40-5 57 ND
SG40-15 140 6.9
SG41 PCE TCE
SG41-5 28 ND
SG41-15 16 ND
SG42 PCE TCE
SG42-5 82 ND
SG42-15 26 ND
SG43 PCE TCE
SG43-5 40 ND
SG43-15 11 ND
SG47 PCE TCE
SG47-5 11 ND
SG47-15 49 ND
SG44 PCE TCE
SG44-5 15 ND
SG44-15 13 ND
SG45 PCE TCE
SG45-5 39 ND
SG45-15 56 ND
SG46 PCE TCE
SG46-5 16 ND
SG46-15 11 ND
SG48 PCE TCE
SG48-5 64 ND
SG48-15 73 ND
1000
100
500
500
50 50
50 50
100
100
1000
100
Approximate Site Boundary
Current Structures
Former UST and Fuel
Dispenser Locations
Sample Location
5-foot PCE Contours in µg/m3
Sample Location not analyzed
100
Note: Samples SG28-5, SG29-5, and
SG30-5 were collected at 5 feet beneath
a basement level. As such, sample results
are considered in the 15-foot contours
rather than the 5-foot.

TABLES
TABLE 1

SAMPLE LOCATION RATIONALES
5261 Arlington Avenue
Riverside, California
Location
IDs
Depth
(feet) Sample Location and Rationale 1,2,3 Soil Analytes 4 Soil Gas Analytes 5 Groundwater6 1 Screened and Analyzed for TPH if Warranted --
5 VOCs VOCs
15 VOCs VOCs
1 TPH --
5 TPH, VOCs VOCs
10 TPH, VOCs --
15 TPH, VOCs VOCs
20 TPH, VOCs --
25 TPH, VOCs --
30 TPH, VOCs --
35 TPH, VOCs --
40 TPH, VOCs --
1 TPH --
5 TPH, VOCs VOCs
1 Screened and Analyzed for TPH if Warranted --
5 VOCs VOCs
15 VOCs VOCs
Groundwater sampled at each boring
location for VOC and TPH analysis.

Groundwater sampled at boring
locations B15, B19, B20, B24, B26, and
B49 for VOC and TPH analysis.

Groundwater sampled at boring location
B13 for VOC and TPH analysis.

Tier 1: Biased targeted sampling addressing the
former auto center, oil and fuel USTs, and fuel
dispensers.

Tier 1: Biased targeted sampling addressing the
former auto center (basement area).

Tier 2: Grid sampling in areas with no identified
potential contaminant sources.

B01-B05
B14-B27,
B49
B28-B30
B06-B13,
B31-B48
Tier 1: Biased Grid sampling along the southern
Site boundary to address potential VOC migration
from the south-adjoining commercial properties.

2. Tier 1 sample locations are those addressing an identified potential contaminant source (i.e. biased sample location).

3. Tier 2 sample locations are those without an identified potential contaminant source (non-biased sample location).

Notes:

1. Grid refers to a 100-foot sampling grid. See Figure 3.

1. While sample collection is proposed at 1, 5, and 15 feet, deeper sampling will be conducted at locations where observations suggest soil impacts at greater depths.

5. Soil Gas Analytical
VOCs - Volatile organic compounds. United States EPA TO-15.

VOCs - Volatile organic compounds. United States EPA 8206B.

TPH - Total petroleum hydrocarbons. United States EPA 8015B (gasoline, diesel and oil range organics).

VOCs - Volatile organic compounds. United States EPA 8206B/5035. Field preservation methods to be utilized during sampling.

TPH - Total petroleum hydrocarbons. United States EPA 8015B (gasoline, diesel and oil range organics).

4. Soil Analytical

6. Groundwater Analytical

TABLE 2

SOIL TPH ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California
SampleID Sample Date TPH as Diesel (C13-C22) TPH as Heavy Hydrocarbons (C23-40) TPH Total as Diesel and Heavy HC (C13-C40) TPH as Gasoline and Light HC. (C4-C12) EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH GRO mg/kg mg/kg mg/kg mg/kg
B14-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B14-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B14-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B14-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B14-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B15-1 6/21/2023 49.1 988 1040 ND<0.116
B15-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B15-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B15-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B15-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-25 6/21/2023 ND<1.62 ND<1.62 ND<1.62 2.14
B16-30 6/21/2023 ND<1.62 ND<1.62 ND<1.62 0.776
B16-35 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B16-40 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B17-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B17-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B17-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B17-15 6/21/2023 293 ND<1.62 293 2280
B17-20 6/21/2023 63.9 ND<1.62 63.9 3420
B17-25 6/21/2023 ND<1.62 ND<1.62 ND<1.62 2.10
B17-30 6/21/2023 ND<1.62 ND<1.62 ND<1.62 377
B17-35 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B17-40 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B18-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B18-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B18-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B18-15 6/21/2023 863 ND<1.62 863 3160
B18-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 5.02
B18-25 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-30 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B19-35 6/21/2023 ND<1.62 ND<1.62 ND<1.62 0.731
B19-40 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
Analytical Methods
Units

TABLE 2

SOIL TPH ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California
SampleID Sample Date TPH as Diesel (C13-C22) TPH as Heavy Hydrocarbons (C23-40) TPH Total as Diesel and Heavy HC (C13-C40) TPH as Gasoline and Light HC. (C4-C12) EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH GRO mg/kg mg/kg mg/kg mg/kg
Analytical Methods
Units
B20-1 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B20-5 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B20-10 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B20-15 6/20/2023 412 ND<1.62 412 1830
B20-20 6/20/2023 346 ND<1.62 346 7280
B20-25 6/20/2023 98.2 ND<1.62 98.2 275
B20-30 6/20/2023 ND<1.62 ND<1.62 ND<1.62 31.3
B20-35 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B20-40 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B21-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B21-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 2420
B21-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 553
B21-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B21-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B21-25 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B22-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B22-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B22-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B22-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B22-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B23-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B23-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B23-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B23-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B23-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B24-1 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B24-5 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B24-10 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B24-15 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B24-20 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B25-1 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B25-5 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B25-10 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B25-15 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B25-20 6/21/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B26-1 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B26-5 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B26-10 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B26-15 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B26-20 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B27-1 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B27-5 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116

TABLE 2

SOIL TPH ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California
SampleID Sample Date TPH as Diesel (C13-C22) TPH as Heavy Hydrocarbons (C23-40) TPH Total as Diesel and Heavy HC (C13-C40) TPH as Gasoline and Light HC. (C4-C12) EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH GRO mg/kg mg/kg mg/kg mg/kg
Analytical Methods
Units
B27-10 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B27-15 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B27-20 6/20/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B28-1 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B28-5 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B29-1 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B29-5 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B30-1 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B30-5 6/15/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
B32-1 6/19/2023 ND<1.62 ND<1.62 ND<1.62 ND<0.116
ESL - R 260 12000 -- 430
ESL - C/I 1200 180000 -- 2000
ESL - CW 1100 54000 -- 1800
Notes:

C/I = commercial/industrial
CW = construction worker
ESL = Environmental Screening Level = Region 2 Regional Water Quality Control Board Environmental Soil Direct Exposure Screening Level mg/kg = milligrams per kilogram
ND = not detected
R = residential
TPH = Total petroleum hydrocarbons
<X = Constituents not detected above method detection limit or method reporting limit.

Detections are noted in bold font

TABLE 3

SOIL VOC ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Sample Date Acetone Benzene n-Butylbenzene sec-Butylbenzene Ethylbenzene Isopropylbenzene Naphthalene n-Propylbenzene Tetrachloroethene Toluene Trichloroethene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene o-Xylene m,p-Xylenes Other VOCs EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg B01-5 06/15/2023 ND<25.0 1.77 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B01-15 06/15/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B02-5 06/15/2023 ND<25.0 1.44 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B02-15 06/15/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B03-5 06/14/2023 ND<25.0 2.59 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.16 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B03-13 06/14/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B04-5 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B04-15 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B05-5 06/16/2023 ND<25.0 1.42 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B05-15 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B06-5 06/16/2023 ND<25.0 3.01 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.47 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B06-15 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B07-5 06/14/2023 ND<25.0 4.15 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 2.07 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B07-15 06/14/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B08-5 06/14/2023 ND<25.0 1.48 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B08-15 06/14/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B09-5 06/14/2023 ND<25.0 2.25 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B09-15 06/14/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B10-5 06/16/2023 ND<25.0 1.37 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B10-15 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B11-5 06/16/2023 ND<25.0 1.20 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B11-15 06/16/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B12-5 06/20/2023 ND<25.0 1.40 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B12-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B13-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B13-15 06/20/2023 ND<25.0 3.12 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.87 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B14-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B14-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B14-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B14-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 14.3 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 7.33 J ND<5.00 ND<1.00 6.59 J ND B15-5 06/21/2023 ND<25.0 1.97 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B15-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B15-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B15-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B16-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B16-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B16-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B16-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 11.1 ND<5.00 22.7 5.04 J ND<2.00 ND<1.00 ND<1.50 15.5 ND<5.00 2.51 J 5.97 J ND B16-25 06/21/2023 ND<25.0 ND<1.00 ND<5.00 6.31 J 128 20.7 41.3 77.6 ND<2.00 ND<1.00 ND<1.50 136 44.1 36.6 166 ND B16-30 06/21/2023 ND<25.0 ND<1.00 36.1 9.18 J 28.9 7.42 J 132 30.3 ND<2.00 ND<1.00 ND<1.50 32.0 8.82 J 2.72 J 4.54 J ND B16-35 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B16-40 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B17-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B17-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B17-15 06/21/2023 ND<12500 ND<500 ND<2500 3160 J 3300 J ND<2500 59200 10700 ND<1000 ND<500 ND<750 172000 50600 23100 33800 ND B17-20 06/21/2023 ND<125000 ND<5000 ND<25000 ND<25000 108000 ND<25000 30700 J 44100 J ND<10000 8900 J ND<7500 269000 88400 244000 621000 ND B17-25 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 8.38 J ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 1.78 J ND B17-30 06/21/2023 ND<1250 ND<50.0 ND<250 704 5370 1010 4800 4080 ND<100 ND<50.0 ND<75.0 2860 1490 ND<50.0 68.0 J ND B17-35 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B17-40 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 2.92 J ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 8.57 J ND<5.00 2.15 J 4.88 J ND B18-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B18-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND Analytical Methods
Units

TABLE 3

SOIL VOC ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Sample Date Acetone Benzene n-Butylbenzene sec-Butylbenzene Ethylbenzene Isopropylbenzene Naphthalene n-Propylbenzene Tetrachloroethene Toluene Trichloroethene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene o-Xylene m,p-Xylenes Other VOCs EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg Analytical Methods
Units
B18-15 06/21/2023 ND<50000 ND<2000 ND<10000 ND<10000 26700 ND<10000 39000 39900 ND<4000 ND<2000 ND<3000 327000 112000 106000 210000 ND B18-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 11.9 20.4 7.64 J 102 43.5 ND<2.00 ND<1.00 3.13 J 340 106 41.3 92.0 ND B18-25 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 3.09 J ND<5.00 55.3 ND<5.00 ND<2.00 ND<1.00 ND<1.50 14.3 ND<5.00 2.45 J 8.03 J ND B19-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-30 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 1.23 J ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-35 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B19-40 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B20-5 06/20/2023 ND<25.0 1.70 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B20-10 06/20/2023 ND<25.0 1.61 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B20-15 06/20/2023 ND<25000 ND<1000 ND<5000 ND<5000 5210 J ND<5000 26200 7060 J ND<2000 ND<1000 ND<1500 73700 14300 5100 J 19600 J ND B20-20 06/20/2023 ND<125000 ND<5000 ND<25000 ND<25000 115000 ND<25000 43400 J 44200 J ND<10000 26200 J ND<7500 342000 101000 221000 536000 ND B20-25 06/20/2023 ND<5000 ND<200 ND<1000 ND<1000 2450 ND<1000 1330 J 2040 ND<400 ND<200 ND<300 15300 5120 3640 9810 ND B20-30 06/20/2023 ND<500 ND<20.0 ND<100 ND<100 911 ND<100 374 174 J ND<40.0 39.6 J ND<30.0 1530 448 1310 3200 ND B20-35 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B20-40 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B21-5 06/21/2023 ND<12500 ND<500 ND<2500 2620 J 10400 3410 J 15800 13400 ND<1000 ND<500 ND<750 104000 37000 10100 39700 ND B21-10 06/21/2023 ND<1250 ND<50.0 ND<250 655 751 405 J 6370 2080 ND<100 ND<50.0 ND<75.0 ND<250 ND<250 ND<50.0 ND<50.0 ND B21-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B21-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B21-25 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 6.44 J ND<5.00 6.93 J ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 1.16 J ND B22-5 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B22-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B22-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B22-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B23-5 06/21/2023 ND<25.0 1.13 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B23-10 06/21/2023 ND<25.0 1.99 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.02 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B23-15 06/21/2023 ND<25.0 2.80 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.59 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B23-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B24-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B24-10 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B24-15 06/20/2023 ND<25.0 1.37 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B24-20 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B25-5 06/21/2023 65.2 1.30 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B25-10 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B25-15 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B25-20 06/21/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B26-5 06/20/2023 ND<25.0 1.25 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B26-10 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B26-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B26-20 06/20/2023 ND<25.0 1.50 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.07 J 1.51 J ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B27-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B27-10 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B27-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B27-20 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B28-5 06/15/2023 ND<25.0 1.02 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B29-5 06/15/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND

TABLE 3

SOIL VOC ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Sample Date Acetone Benzene n-Butylbenzene sec-Butylbenzene Ethylbenzene Isopropylbenzene Naphthalene n-Propylbenzene Tetrachloroethene Toluene Trichloroethene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene o-Xylene m,p-Xylenes Other VOCs EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg Analytical Methods
Units
B30-5 06/15/2023 ND<25.0 2.01 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.14 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B31-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B31-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B32-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B32-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B33-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B33-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B34-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B34-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B35-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B35-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B36-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B36-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B37-5 06/20/2023 ND<25.0 1.38 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B37-15 06/20/2023 ND<25.0 1.77 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B38-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B38-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B39-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B39-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B40-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B40-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B41-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B41-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B42-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B42-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B43-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B43-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B44-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B44-15 06/19/2023 ND<25.0 2.23 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.31 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B45-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B45-15 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B46-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B46-15 06/19/2023 ND<25.0 1.95 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B47-5 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B47-15 06/19/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B48-5 06/20/2023 ND<25.0 ND<1.00 ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 ND<1.00 ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND B48-15 06/20/2023 ND<25.0 2.58 J ND<5.00 ND<5.00 ND<1.00 ND<5.00 ND<5.00 ND<5.00 ND<2.00 1.70 J ND<1.50 ND<5.00 ND<5.00 ND<1.00 ND<1.00 ND ESL - R 61000000 330 -- -- 5900 -- 3800 -- 590 1100000 950 -- -- 580000 580000 -- ESL - C/I 670000000 1400 -- -- 26000 -- 17000 -- 2700 5300000 6100 -- -- 2500000 2500000 -- ESL - CW 270000000 33000 -- -- 540000 -- 400000 -- 33000 4700000 18000 -- -- 2400000 2400000 -- Notes:

C/I = commercial/industrial
CW = construction worker
ESL = Environmental Screening Level = Region 2 Regional Water Quality Control Board Environmental Soil Direct Exposure Screening Level J = Result is less than the reporting limit but greater than or equal to the method detection limit and the concentration is an approximate value. mg/kg = milligrams per kilogram
ND = not detected
R = residential
VOC = volatile organic compound
<X = Constituents not detected above method detection limit or method reporting limit.

Detections are noted in bold font

TABLE 4

GROUNDWATER TPH ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California
SampleID Sample Date TPH as Diesel (C13-C22) TPH as Heavy Hydrocarbons (C23-40) TPH Total as Diesel and Heavy HC (C13-C40) TPH as Gasoline and Light HC. (C4-C12) EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH DRO/ORO EPA 8015B TPH GRO mg/L mg/L mg/L mg/L
GW1 06/16/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW2 06/16/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW3 06/14/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW4 06/16/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW5 06/16/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW13 06/21/2023 ND<0.0123 ND<0.0123 ND<0.0123 0.00705
GW15 06/21/2023 ND<0.0123 ND<0.0123 ND<0.0123 0.00632
GW19 06/21/2023 0.346 ND<0.0123 0.346 1.14
GW20 06/20/2023 0.0859 J ND<0.0123 0.0859 J 0.621
GW24 06/20/2023 ND<0.0123 ND<0.0123 ND<0.0123 0.00904
GW26 06/20/2023 ND<0.0123 ND<0.0123 ND<0.0123 ND<0.00500 GW49 06/21/2023 0.116 ND<0.0123 0.116 0.183
Notes:

J = Result is less than the reporting limit but greater than or equal to the method detection limit and the concentration is an approximate value.

ND = not detected
TPH = Total petroleum hydrocarbons
mg/L = milligrams per liter
<X = Constituents not detected above method detection limit or method reporting limit.

Detections are noted in bold font
Analytical Methods
Units

TABLE 5

GROUNDWATER VOC ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California SampleID Sample Date Acetone Benzene sec-Butylbenzene Ethylbenzene Isopropylbenzene Naphthalene n-Propylbenzene Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Freon-113 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene o-Xylene m,p-Xylenes Other VOCs EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B EPA 8260B µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L GW1 06/16/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 1.45 ND<0.500 ND<0.500 0.630 J 0.740 J ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW2 06/16/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 0.810 J ND<0.500 ND<0.500 1.19 1.44 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW3 06/14/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 1.08 1.20 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW4 06/16/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 1.29 1.63 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW5 06/16/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 1.15 1.16 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW13 06/21/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 0.590 J ND<0.500 ND<0.500 ND<0.500 0.690 J ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW15 06/21/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 15.8 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW19 06/21/2023 ND<5.00 ND<0.50 6.23 2.78 ND<0.500 1.80 1.11 ND<0.500 ND<0.500 1.32 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW20 06/20/2023 ND<5.00 ND<0.50 1.20 28.8 3.08 12.7 11.0 ND<0.500 9.52 3.03 ND<0.500 ND<0.500 61.9 18.9 57.9 128 ND GW24 06/20/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW26 06/20/2023 ND<5.00 ND<0.50 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 2.67 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<1.00 ND GW49 06/21/2023 17.6 ND<0.500 0.850 J 17.5 1.56 13.8 6.32 ND<0.500 ND<0.500 6.71 ND<0.500 0.610 J 19.6 ND<0.500 8.90 18.4 ND 14000 1.0 -- 30 -- 0.17 -- 5.0 40 5.0 -- -- -- -- 20 20 -- Notes:

J = Result is less than the reporting limit but greater than or equal to the method detection limit and the concentration is an approximate value.

MCL = Maximum Contaminant Level
ND = not detected
VOC = volatile organic compound
µg/L = micrograms per liter
<X = Constituents not detected above method detection limit or method reporting limit.

Detections are noted in bold font
Analytical Methods
Units
MCL

TABLE 6

SOIL GAS ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Date Units Benzene Toluene Ethylbenzene Total Xylenes Naphthalene Acetone sec-Butylbenzene tert-Butylbenzene 4-Methyl-2-Pentanone Isopropylbenzene n-Butylbenzene n-Propylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Freon 113 Tetrachloroethene 1,1,1-Trichloroethane Trichloroethene Chloroform Trichlorofluoromethane Other VOCs SG1-5 6/15/2023 µg/m
3 12 30 9.6 38 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 22 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG1-15 6/15/2023 µg/m
3 15 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 390 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG2-5 6/15/2023 µg/m
3 48 61 ND<1.0 32 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 8.1 150 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG2-15 6/15/2023 µg/m
3 33 34 ND<1.0 15 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 95 1300 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG3-5 6/15/2023 µg/m
3 18 14 ND<1.0 31 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 220 810 18 ND<1.0 ND<1.0 67 ND SG3-15 6/15/2023 µg/m
3 17 11 ND<1.0 19 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 360 1100 ND<1.0 ND<1.0 ND<1.0 33 ND SG4-5 6/16/2023 µg/m
3 10 18 5.8 13 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 170 250 ND<1.0 ND<1.0 ND<1.0 95 ND SG4-15 6/16/2023 µg/m
3 26 49 8.8 45 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 240 270 ND<1.0 ND<1.0 ND<1.0 75 ND SG5-5 6/16/2023 µg/m
3 13 23 6.5 29 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 35 63 ND<1.0 ND<1.0 ND<1.0 14 ND SG5-15 6/16/2023 µg/m
3 37 78 16 66 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 61 28 ND<1.0 ND<1.0 ND<1.0 23 ND SG6-5 6/16/2023 µg/m
3 23 50 17 99 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 290 94 ND<1.0 ND<1.0 ND<1.0 140 ND SG6-15 6/16/2023 µg/m
3 16 49 4.7 44 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 410 150 ND<1.0 ND<1.0 ND<1.0 130 ND SG7-5 6/15/2023 µg/m
3 19 22 ND<1.0 30 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 28 710 ND<1.0 ND<1.0 ND<1.0 65 ND SG7-15 6/15/2023 µg/m
3 13 7.2 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 320 1400 ND<1.0 ND<1.0 ND<1.0 21 ND SG8-5 6/15/2023 µg/m
3 23 42 12 51 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 100 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG8-15 6/15/2023 µg/m
3 14 16 6.1 18 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 12 530 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG9-5 6/15/2023 µg/m
3 56 34 ND<1.0 13 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 36 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG9-15 6/15/2023 µg/m
3 19 17 ND<1.0 9.4 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 49 710 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG10-5 6/16/2023 µg/m
3 33 140 38 210 ND<1.0 ND<50 15 87 ND<50 ND<1.0 ND<1.0 16 84 21 420 130 ND<1.0 ND<1.0 ND<1.0 14 ND SG10-15 6/16/2023 µg/m
3 24 100 21 100 ND<1.0 ND<50 7.5 22 ND<50 ND<1.0 ND<1.0 8.1 43 3.5 340 100 ND<1.0 ND<1.0 ND<1.0 110 ND SG11-5 6/16/2023 µg/m
3 47 140 37 180 ND<1.0 59 8.4 75 56 ND<1.0 ND<1.0 20 78 18 8.5 8.9 ND<1.0 ND<1.0 ND<1.0 12 ND SG11-15 6/16/2023 µg/m
3 31 150 45 240 ND<1.0 ND<50 ND<1.0 98 ND<50 ND<1.0 ND<1.0 22 130 59 170 19 ND<1.0 ND<1.0 ND<1.0 140 ND SG12-5 6/22/2023 µg/m
3 37 34 ND<1.0 15 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 15 170 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG12-15 6/22/2023 µg/m
3 8.1 8.8 ND<1.0 11 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 41 250 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG13-5 6/22/2023 µg/m
3 38 31 8.2 35 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 27 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG13-15 6/22/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 11 80 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG14-5 6/23/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG14-15 6/23/2023 µg/m
3 ND<10 ND<10 9800 2200 ND<10 ND<500 ND<10 ND<10 ND<500 ND<10 ND<10 ND<10 1800 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND SG15-5 6/23/2023 µg/m
3 50 610 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG15-15 6/23/2023 µg/m
3 43 830 25 38 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 4.6 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG16-5 6/23/2023 µg/m
3 130 960 16000 27000 ND<10 ND<500 220 270 ND<500 ND<10 440 4800 8400 3600 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND SG16-15 6/23/2023 µg/m
3 37 440 7400 6900 ND<10 ND<500 56 110 ND<500 ND<10 63 830 680 440 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND SG17-5 6/23/2023 µg/m
3 69 540 2100 7900 ND<10 ND<500 130 180 ND<500 ND<10 38 430 810 630 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND SG17-15 6/23/2023 µg/m
3 ND<100 14000 53000 320000 ND<100 ND<5000 2600 4100 ND<5000 ND<100 22000 22000 39000 34000 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND SG18-5 6/23/2023 µg/m
3 80 880 12000 57000 ND<10 ND<500 1600 2700 ND<500 ND<10 1500 6800 19000 9800 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND SG18-15 6/23/2023 µg/m
3 170 24000 260000 450000 ND<100 ND<5000 22000 32000 ND<5000 ND<100 15000 98000 170000 56000 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND SG19-5 6/23/2023 µg/m
3 97 1700 1300 81 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 160 200 130 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG19-15 6/23/2023 µg/m
3 2.4 150 190 17 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 75 160 83 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG20-5 6/22/2023 µg/m
3 120 4500 2200 11000 ND<10 ND<500 660 6900 ND<500 ND<10 ND<10 ND<10 6400 1300 ND<10 27 ND<10 ND<10 ND<10 ND<10 ND SG20-15 6/22/2023 µg/m
3 ND<100 81000 130000 290000 2500 ND<5000 31000 36000 ND<5000 ND<100 11000 95000 160000 96000 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND SG21-5 6/23/2023 µg/m
3 150 87 3800 830 ND<1.0 ND<50 170 160 ND<50 ND<1.0 150 1200 1100 320 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG21-15 6/23/2023 µg/m
3 ND<10 ND<10 960 270 ND<10 ND<500 ND<10 ND<10 ND<500 ND<10 ND<10 700 160 49 ND<1.0 ND<100 ND<10 ND<10 ND<10 ND<10 ND SG22-5 6/23/2023 µg/m
3 13 130 9.4 9.3 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG22-15 6/23/2023 µg/m
3 39 150 8.4 44 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 23 21 ND<1.0 10 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG23-5 6/22/2023 µg/m
3 27 9.8 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 8.4 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG23-15 6/22/2023 µg/m
3 33 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 12 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG24-5 6/22/2023 µg/m
3 5.5 110 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 14 ND<1.0 29 ND<1.0 ND<1.0 ND SG24-15 6/22/2023 µg/m
3 9.1 240 ND<1.0 6.6 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 11 180 ND<1.0 32 ND<1.0 ND<1.0 ND SG25-5 6/22/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 18 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 26 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND

TABLE 6

SOIL GAS ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Date Units Benzene Toluene Ethylbenzene Total Xylenes Naphthalene Acetone sec-Butylbenzene tert-Butylbenzene 4-Methyl-2-Pentanone Isopropylbenzene n-Butylbenzene n-Propylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Freon 113 Tetrachloroethene 1,1,1-Trichloroethane Trichloroethene Chloroform Trichlorofluoromethane Other VOCs SG25-15 6/22/2023 µg/m
3 95 31 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 16 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG26-5 6/21/2023 µg/m
3 19 29 ND<1.0 13 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 39 ND<1.0 17 ND<1.0 ND<1.0 ND SG26-15 6/21/2023 µg/m
3 13 35 ND<1.0 8.8 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 49 ND<1.0 29 ND<1.0 ND<1.0 ND SG27-5 6/21/2023 µg/m
3 91 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 4.4 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG27-15 6/21/2023 µg/m
3 60 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 19 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG28-5 6/22/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 7.5 54 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG29-5 6/22/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 52 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG30-5 6/22/2023 µg/m
3 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 57 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG31-5 6/20/2023 µg/m
3 74 91 ND<1.0 56 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 110 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG31-15 6/20/2023 µg/m
3 23 51 9.1 54 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 290 22 ND<1.0 ND<1.0 ND<1.0 130 ND SG32-5 6/20/2023 µg/m
3 95 290 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 180 64 ND<1.0 ND<1.0 ND<1.0 70 ND SG32-15 6/20/2023 µg/m
3 19 51 ND<1.0 8.6 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 280 21 ND<1.0 ND<1.0 ND<1.0 120 ND SG33-5 6/20/2023 µg/m
3 54 120 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 110 46 ND<1.0 ND<1.0 ND<1.0 16 ND SG33-15 6/20/2023 µg/m
3 22 67 ND<1.0 28 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 600 36 ND<1.0 ND<1.0 ND<1.0 190 ND SG34-5 6/21/2023 µg/m
3 55 88 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 240 85 ND<1.0 ND<1.0 ND<1.0 70 ND SG34-15 6/21/2023 µg/m
3 31 45 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 250 67 ND<1.0 ND<1.0 ND<1.0 81 ND SG35-5 6/20/2023 µg/m
3 42 86 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 250 65 ND<1.0 ND<1.0 ND<1.0 75 ND SG35-15 6/20/2023 µg/m
3 43 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 240 53 ND<1.0 ND<1.0 ND<1.0 120 ND SG36-5 6/22/2023 µg/m
3 27 30 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 34 20 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG36-15 6/22/2023 µg/m
3 15 19 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 290 18 ND<1.0 ND<1.0 ND<1.0 99 ND SG37-5 6/21/2023 µg/m
3 18 31 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 130 75 ND<1.0 ND<1.0 13 38 ND SG37-15 6/21/2023 µg/m
3 29 19 ND<1.0 6.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 84 11 ND<1.0 ND<1.0 ND<1.0 34 ND SG38-5 6/21/2023 µg/m
3 54 53 ND<1.0 8.9 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 210 180 ND<1.0 ND<1.0 35 93 ND SG38-15 6/21/2023 µg/m
3 28 27 ND<1.0 5.8 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 270 290 ND<1.0 ND<1.0 ND<1.0 75 ND SG39-5 6/21/2023 µg/m
3 15 11 6.8 71 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 97 230 ND<1.0 ND<1.0 ND<1.0 52 ND SG39-15 6/21/2023 µg/m
3 18 23 ND<1.0 97 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 160 260 ND<1.0 ND<1.0 ND<1.0 51 ND SG40-5 6/21/2023 µg/m
3 36 71 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 270 57 ND<1.0 ND<1.0 ND<1.0 85 ND SG40-15 6/21/2023 µg/m
3 14 7.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 330 140 ND<1.0 6.9 ND<1.0 120 ND SG41-5 6/21/2023 µg/m
3 24 17 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 210 28 ND<1.0 ND<1.0 ND<1.0 80 ND SG41-15 6/21/2023 µg/m
3 28 19 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 150 16 ND<1.0 ND<1.0 ND<1.0 120 ND SG42-5 6/20/2023 µg/m
3 45 85 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 390 82 ND<1.0 ND<1.0 ND<1.0 150 ND SG42-15 6/20/2023 µg/m
3 21 6.3 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 440 26 ND<1.0 ND<1.0 ND<1.0 140 ND SG43-5 6/20/2023 µg/m
3 52 97 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 80 40 ND<1.0 ND<1.0 ND<1.0 25 ND SG43-15 6/20/2023 µg/m
3 11 4.8 ND<1.0 ND<1.0 ND<1.0 90 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 92 11 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG44-5 6/20/2023 µg/m
3 42 69 20 95 ND<1.0 110 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 110 15 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG44-15 6/20/2023 µg/m
3 13 7.9 ND<1.0 5.3 ND<1.0 170 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 140 13 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG45-5 6/21/2023 µg/m
3 39 63 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 130 39 ND<1.0 ND<1.0 ND<1.0 73 ND SG45-15 6/21/2023 µg/m
3 44 74 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 72 56 ND<1.0 ND<1.0 ND<1.0 60 ND SG46-5 6/20/2023 µg/m
3 21 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 120 16 ND<1.0 ND<1.0 ND<1.0 56 ND SG46-15 6/20/2023 µg/m
3 25 30 ND<1.0 5.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 130 11 ND<1.0 ND<1.0 ND<1.0 45 ND SG47-5 6/20/2023 µg/m
3 28 98 22 91 ND<1.0 60 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 75 11 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG47-15 6/20/2023 µg/m
3 24 38 9.7 15 ND<1.0 110 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 77 49 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND SG48-5 6/21/2023 µg/m
3 16 22 ND<1.0 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 15 64 ND<1.0 ND<1.0 ND<1.0 42 ND SG48-15 6/21/2023 µg/m
3 18 15 ND<1.0 12 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 24 73 ND<1.0 ND<1.0 ND<1.0 36 ND SL-R Low Threat w bio µg/m
3 85000 -- 1100000 -- 93000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SL-C/I Low Threat w bio µg/m
3 280000 -- 3600000 -- 310000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SL-R Low Threat w/o bio µg/m
3 85 -- 1100 -- 93 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SL-C/I Low Threat w/o bio µg/m
3 280 -- 3600 -- 310 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ESL-R µg/m
3 3.2 10000 37 3500 2.8 1100000 -- -- 100000 -- -- -- -- -- -- 15 35000 16 4.1 -- -- ESL-C/I µg/m
3 14 44000 160 15000 12 4500000 --
-- 440000 -- -- -- -- -- -- 67 150000 100 18 ----

TABLE 6

SOIL GAS ANALYTICAL RESULTS
5261 Arlington Avenue
Riverside, California Sample ID Date Units Benzene Toluene Ethylbenzene Total Xylenes Naphthalene Acetone sec-Butylbenzene tert-Butylbenzene 4-Methyl-2-Pentanone Isopropylbenzene n-Butylbenzene n-Propylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Freon 113 Tetrachloroethene 1,1,1-Trichloroethane Trichloroethene Chloroform Trichlorofluoromethane Other VOCs Notes:

C/I = commercial/industrial
ESL = 2019 Region 2 Regional Water Quality Control Board Soil Gas Vapor Intrusion Environmental Screening Levels.

ND = not detected
R = residential
µg/m3 = micrograms per cubic meter
<X = Constituents not detected above method detection limit or method reporting limit. -- = no available LTCP screening criteria or 2019 Region 2 ESL.

Detections are noted in bold font
SL-Low Threat = Screening Levels for benzene and ethylbenzene with (w) and without (w/o) bioattenuation zone (bio) as defined in Appendix 4 of the LTCP policy.

ATTACHMENT A
2015 Phase II Environmental Site Assessment Analytical Results Sears Retail
Store #1298
(5261 Arlington
Avenue)
Sears Auto Center
Bank of
America (5295
Arlington Ave)
Parking
Parking
Parking
Gentle
Chiropractic
Care (6828
Streeter Ave)
Vacant
Shell Gas
Station (5305
Arlington Ave)
Arlington Ave
Sierra Street
Stre
eter A
v
e
Granada Ave
Sierra Street
Granada Ave
C
a
pistra
n
o
W
a
y
Residences
(6915-6945
Streeter Ave)
Residences
(6915-6945
Streeter
Ave)
Residences
(5178-5266
Sierra St)
Residences
(6825-6975
Capistrano
Way)
Residences
(6825-6975
Capistrano
Way)
Former
Fueling
Island
Starbucks
Del Taco
Heritage Plaza
(5200 Arlington Avenue)
Parking
Janet Goeske
Foundation & Senior
Center (5257 Sierra
Street)
N
Project Mngr:

Approved By:

Checked By:

Drawn By:

Project No.

Scale:

Date:

File No.

FIG. No.

Consulting Engineers and Scientists
21905 64th Avenue W., Ste 100 Mountlake Terrace, WA 98043

SITE DIAGRAM
Sears Store #1298
5261 Arlington Avenue
Riverside, Riverside County, Washington 2
December 2014
*.dwg
Not to Scale
MYW 81149324.1298
CJP
~
MYW
LEGEND:

APPROXIMATE SITE

BOUNDARY
Basemap PDF file provided by Client and modified by Terracon.

INFERRED GROUNDWATER
FLOW DIRECTION Crown
Cleaner
TSW-1
Approximate boring location
C5 - C12 C10 - C28

1. VOCs = Volatile organic compounds analyzed by EPA Method 8260B

2. TPH = Total petroleum hydrocarbons analyzed by EPA Method 8015

3. Only those constituents detected above the laboratory detection limit are reported ND = non detected NA - not applicable
(J) = Estimated value, value is above the laboratory detection limit, but below the laboratory quantitiation limit NE = Not Established
RSLs = Regional Screening Levels for EPA Region 9, California MSLs = Maximum Screening Levels (MSLs) for soils <20 feet for distance above groundwater, Region 4, Regional Water Quality Control Board-Los Angeles Region, Interim Site Assessment & Cleanup Guidebook, January 2005 ND
n-butylbenzene-0.12
sec-butylbenzene-0.021
tert-butylbenzene-0.001J
ethylbenzene-0.0022J
isopropylbenzene-0.0045J
p-isopropyltoluene-0.03J
naphthalene-1
n-propylbenzene-0.037
1,2,4-trimethylbenzene-0.72
1,2,3-trimethylbenzene-0.37
1,3,5-trimethylbenzene-0.14
total xylenes-0.016
ND
RSLs
(Residential)
n-butylbenzene-3900
sec-butylbenzene-7800
tert-butylbenzene-7800
ethylbenzene-5.8
isopropylbenzene-NE
p-isopropyltoluene-NE
naphthalene-3.8
n-propylbenzene-NE
1,2,4-trimethylbenzene-58
1,2,3-trimethylbenzene-49
1,3,5-trimethylbenzene-780
total xylenes-580

NE NE NE
MSLs
TABLE 1
SOIL SAMPLE ANALYTICAL RESULTS - VOCs1 and TPH2
Sears Automotive Center - Store #1298
5261 Arlington Avenue
25 - 26 03/06/15
TSW-1 03/06/15 ND
Sample Date
Bold denotes concentrations that exceed [State Action/Screening Level] TSW-2 1.9 26
Riverside, California
Terracon Project No. 60159016.1298
TPH
(mg/kg) VOCs3
(mg/kg)
100
21 - 22
Sample Depth
(feet bgs) Sample I.D.

ND
C-28 - C40
TSW-3
ND
TSW-4
TSW-5
14 -15
ND
14 - 15
38 - 39
03/06/15
NE 100
ND
ND
ND
ND
1,000
ND
ND
03/06/15 ND
03/06/15 ND
ND ND
ND

C5 - C12 C10 - C28 C-28 - C40
TSW-2 03/06/15 5.7 0.41 0.058J
TSW-3 03/06/15 ND 0.17 0.12
TSW-4 03/06/15 ND 0.11 0.037J
TSW-5 03/06/15 ND 1.5 0.15

1. VOCs = Volatile organic compounds analyzed by [8260B]

2. TPH = Total petroleum hydrocarbons analyzed by [8015] ND = non detected NE = not established
(J) = Estimated value, value is above the laboratory detection limit, but below the laboratory quantitiation limit ND - non detected NA=not applicable
Bold denotes concentrations that exceed applicable screening level ESLs - Environmental Screening Levels, established by the Regional Water Quality Control Board, San Francisco Region for Groundwater, December 2013
Cal-MCLs = California's Environmental Protection Agency's Maximum Contamination Levels, July 2014

0.15 ESLs
NE
TSW-1
benzene-0.0078
n-butylbenzene-0.021
sec-butylbenzene-0.009
ter-butylbenzene-0.0014
carbon disulfide-0.00032J
1,2-dichloroethane-0.0052
Di-isopropyl ether-0.00048J
ethylbenzene-0.99
Isopropylbenzene-0.051
p-isopropyltoluene-0.0032
naphthalene-0.18
n-propylbenzene-0.14
styrene-0.00081J
tetrachloroethene-0.000046J
toluene-0.036
1,2,4-trimethylbenzene-1.5
1,2,3-trimethylbenzene-0.36
1,3,5-trimethylbenzene-0.2
total xylenes-2.6
chloroform-0.0045J
ethylbenzene-0.00051J
tetrachloroethene-0.0012
1,2,4-trimethylbenzene-0.00083J
total xylenes-0.0011J
Sample I.D. Sample Date
NE
TPH
(mg/L)
NE

4. Description of State Action/Screening Level
cis-1,2-dichloroethene-0.00033J
tetrachloroethene-0.0042
1,2,4-trimethylzenzene-0.00045J

0.1 0.1
Cal-MCLs
Sears Automotive Center - Store #1298
5261 Arlington Avenue
Riverside, California
Terracon Project No. 60159016.1298
NA
TABLE 2
GROUNDWATER SAMPLE ANALYTICAL RESULTS - VOCs1 and TPH2

0.1 03/06/15
benzene-0.0006J
n-butylbenzene-0.0056
sec-butylbenzene-0.004
carbon disulfide-0.00053J
ethylbenzene-0.18
isopropylbenzene-0.016
naphthalene-0.022
n-propylbenzene-0.049
tetrachloroethene-0.00043J
toluene-0.0019J
1,2,4-trimethylbenzene-0.053
123-trimethylbenzene-0.055
1,3,5-trimethylbenzene-0.016
total xylenes-0.13
NA 0.49
VOCs3
(mg/L)
acetone-0.019J
tetrachloroethene-0.0026
acetone-NE
benzene-0.001
n-butylbenzene-NE
sec-butylbenzene-NE
ter-butylbenzene-NE
carbon disulfide-NE
chloroform-NE
1,2-dichloroethane-0.0005
cis-1,2-dichloroethene-0.006
Di-isopropyl ether-NE
ethylbenzene-0.3
Isopropylbenzene-NE
p-isopropyltoluene-NE
naphthalene-NE
n-propylbenzene-NE
styrene-0.1
tetrachloroethene-0.005
toluene-NE
1,2,4-trimethylbenzene-NE
1,2,3-trimethylbenzene-NE
1,3,5-trimethylbenzene-NE
total xylenes-1.75

ATTACHMENT B
Boring Logs
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B01
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41730
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Silty SAND with gravel (SM); mostly fine-coarse grained sand, little fine gravel, some silt, poorly graded, loose, dry, brown
(4.50') Silty SAND (SM); mostly fine grained sand, trace fine gravel, some silt, trace clay, poorly graded, medium dense, moist, dark brown
(14.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (15.00') No Recovery
B01-1
B01-5
B01-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B01
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41730
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (15.00') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50. Water sample GW1 collected at 43.0-43.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B01
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41730
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (15.00') No Recovery
(50.00') Boring terminated; no soil samples collected below 15'. Temporary soil gas probes set at 5' and 15'.
40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50'.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B02
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41702
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Silty SAND with gravel (SM); mostly fine-coarse grained sand, little fine gravel, some silt, poorly graded, loose, dry, brown
(4.50') Silty SAND (SM); mostly fine grained sand, trace fine gravel, some silt, trace clay, poorly graded, medium dense, moist, dark brown
(10') As Above
(14.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (15.00') No Recovery
B02-1
B02-5
B02-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50'.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B02
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41702
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (15.00') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Boring terminated at 50'. Water sample GW2 collected at 44.0-44.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B02
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41702
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (15.00') No Recovery
(50.00') Boring terminated. No soil samples collected beyond 15'. Temporary soil gas probes set at 5' and 15'.
40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared on 6/14/2023 by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B03
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41669
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
GR
DP
09:24

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Poorly graded SAND (SP); fine grained, medium dense, dry, dark brown (3.50') Poorly graded SAND (SP); mostly fine grained sand, medium dense, dry, dark brown
(7.50') Poorly graded SAND (SP); fine grained, medium dense, moist, dark brown (15.00') Poorly graded SAND (SP); fine grained, dense, moist, dark brown B3-1
B3-5
B3-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared on 6/14/2023 by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B03
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41669
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 (20.00') Sandy lean CLAY (CL); some fine sand, mostly clay, medium plasticity, moist, light brown
(25.00') SILT with sand (ML); little fine-coarse gravel, some fine sand, mostly silt, some clay, low plasticity, moist, light brown
(30.00') Poorly graded SAND (SP); fine grained, some silt, medium dense, moist, light brown
(34.50') Poorly graded SAND (SP); fine grained, some silt, medium dense, moist, light brown
(35.00') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared on 6/14/2023 by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B03
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
43 N/A
N/A

33.94635, -117.41669
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (35.00') No Recovery
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B04
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
GR

0.50 0.50
(0.00') Asphalt
(0.50') Poorly graded SAND with silt (SP-SM); medium grained, some silt, loose, dry, brown
(4.50') Poorly graded SAND with silt (SP-SM); mostly fine-coarse grained sand, little silt, loose, dry, brown
(14.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (15.00') No Recovery
B04-1
B04-5
B04-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B04
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (15.00') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Water sample GW04 collected at 44.0-44.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B04
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/15/2023
06/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (15.00') No Recovery
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

GW04
40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B05
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 11:45
6/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Well-graded SAND (SW); fine-medium grained, some silt, loose, dry, brown (4.50') Well-graded SAND (SW); fine-medium grained, some silt, loose, dry, brown (12.00') Well-graded SAND (SW); fine-medium grained, some silt, very dense, brown (14.50') Well-graded SAND (SW); fine-medium grained, some silt, very dense, brown (15.00') No Recovery
B05-1
B05-5
B05-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B05
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 11:45
6/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (15.00') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B05
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 11:45
6/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
44 N/A
N/A

33.94635, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (15.00') No Recovery
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. GW05 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B06
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023
6/15/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94664, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 (0.00') Asphalt
(0.50') Silty SAND (SM); fine grained, some silt, medium dense, moist, brown (4.50') Silty SAND (SM); fine grained, some silt, medium dense, moist, brown (10') As Above
(14.50') Poorly graded SAND (SP); fine grained, some silt, dense, moist, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B6-1
B6-5
B6-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B07
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023 13:43
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):

15.0 2.0
Direct Push
N/A
N/A
N/A

33.94662, -117.41670
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
DP

0.50 (0.00') Asphalt
(0.50') Silty SAND (SM); fine grained, some silt, loose, moist, dark brown (5.00') Silty SAND (SM); fine grained, trace fine-coarse gravel, some silt, loose, moist, dark brown
(10') As Above
(14.50') Poorly graded SAND (SP); fine grained, medium dense, dry, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B07-1
B07-5
B07-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B08
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023 14:25
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push
N/A
N/A
N/A

33.94663, -117.41730
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
DP

0.50 (0.00') Asphalt
(0.50') Silty SAND (SM); fine grained, some silt, loose, dry, dark brown (4.50') Silty SAND (SM); fine grained, some silt, loose, moist, dark brown (14.50') Poorly graded SAND (SP); fine grained, medium dense, dry, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B08-1
B08-5
B08-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B09
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/14/2023 15:00
6/14/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push
N/A
N/A
N/A

33.94687, -117.41703
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
DP

0.50 0.50
(0.00') Asphalt
(0.50') Silty SAND (SM); fine grained, some silt, loose, moist, dark brown (4.50') Silty SAND (SM); fine grained, some silt, loose, moist, dark brown (10') As Above
(14.50') Poorly graded SAND (SP); fine grained, some silt, medium dense, moist, light brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B09-1
B09-5
B09-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B10
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/16/2023
06/16/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94691, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50
(0.00') Asphalt
(0.50') Sandy SILT (ML); few fine-medium sand, mostly silt, trace clay, medium plasticity, moist, dark brown
(5') As Above
(10') As Above
(14.50') SILT (ML); mostly silt, some clay, low plasticity, moist, light greenish-gray (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B10-1
B1-5
B10-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B11
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/16/2023 14:05
6/16/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94720, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50
(0.00') Asphalt
(0.50') Sandy SILT (ML); little fine-medium sand, mostly silt, moist, dark brown (4.50') Sandy SILT (ML); little fine-medium sand, mostly silt, moist, dark brown (10') As Above
(14.50') SILT (ML); mostly silt, some clay, low plasticity, moist, dark greenish (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B11-1
B11-5
B11-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B12
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/20/2023
06/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94720, -117.41769
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); dry, dark brown
(4.5') As Above
(14.50') SILT (ML); dry, dark brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B12-01
B12-05
B12-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B13
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/20/2023
06/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
40 N/A
N/A
N/A
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); dry, dark brown
(5') As Above
(15') As Above
(15.50') No Recovery
B13-1
B13-5
B13-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B13
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/20/2023
06/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
40 N/A
N/A
N/A
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (15.50') No Recovery
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger. Water sample GW13 collected at 40.0-40.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B13
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/20/2023
06/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
40 N/A
N/A
N/A
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (15.50') No Recovery
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B14
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/21/2023
06/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94733, -117.41827
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50
(0.00') Asphalt
(0.50') SILT (ML); some clay, low plasticity, stiff, dry, dark brown (4.5') As Above
(11.50') Poorly graded SAND (SP); fine grained, moist, light brown (15') As Above
(19.5') As Above
B14-1
B14-5
B14-10
B14-15
B14-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B14
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
06/21/2023
06/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94733, -117.41827
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (20.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B15
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
33 N/A
N/A

33.94720, -117.41833
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); some clay, low plasticity, stiff, dry, dark brown (4.5') As Above
(11.50') Poorly graded SAND (SP); fine grained, moist, light brown (19.50') SILT (ML); few fine-coarse gravel, stiff, moist, brown B15-1
B15-5
B15-10
B15-15
B15-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger. Water sample GW15 collected at 33.0-33.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B15
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
33 N/A
N/A

33.94720, -117.41833
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
GR

0.50 0.50

0.50 (19.50') SILT (ML); few fine-coarse gravel, stiff, moist, brown (29.50') Poorly graded SAND with gravel (SP); some fine-coarse gravel, few silt, medium dense, moist, light brown
(36.00') Well-graded SAND with gravel (SW); fine grained, some fine-coarse gravel, little silt, dense, saturated, light brown
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B15
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
33 N/A
N/A

33.94720, -117.41833
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (36.00') Well-graded SAND with gravel (SW); fine grained, some fine-coarse gravel, little silt, dense, saturated, light brown
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B16
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94734, -117.41838
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); some clay, low plasticity, stiff, dry, dark brown (4.5') As Above
(11.50') Poorly graded SAND (SP); fine grained, moist, light brown (14.5') As Above
(19.5') As Above
B16-1
B16-5
B16-10
B16-15
B16-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B16
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94734, -117.41838
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 0.50
(19.5') As Above
(25') As Above: hydrocarbon staining observed
(29.5') As Above: hydrocarbon staining observed
(34.5') As Above: no staining
(39.5') As Above
B16-25
B16-30
B16-35
B16-40
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B16
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94734, -117.41838
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (40.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B17
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94735, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); some clay, low plasticity, stiff, dry, dark brown (4.5') As Above
(9.5') As Above
(11.50') Poorly graded SAND (SP); fine grained, dry, light brown (14.5') As Above
(19.5') As Above: hydrocarbon staining observed
B17-1
B17-5
B17-10
B17-15
B17-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B17
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94735, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 0.50
(19.5') As Above: hydrocarbon staining observed
(24.5') As Above: hydrocarbon staining observed
(29.5') As Above: hydrocarbon staining observed
(34.5') As Above: no staining observed
(39.5') As Above
B17-25
B17-30
B17-35
B17-40
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B17
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
40 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94735, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (40.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B18
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
25 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94743, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 0.50
(0.00') Asphalt
(0.50') Silty SAND (SM); fine-coarse grained, few fine-coarse gravel, trace clay, medium dense, moist, dark brown, artificial fill
(4.5') As Above
(9.5') As Above
(13.50') Poorly graded SAND (SP)
(14.5') As Above: hydrocarbon staining observed
(19.5') As Above: hydrocarbon staining observed
B18-1
B18-5
B18-10
B18-15
B18-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B18
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
25 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94743, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP 0.50
(19.5') As Above: hydrocarbon staining observed
(24.5') As Above: no staining
(25.00') Boring terminated; practical refusal due to heaving sands. Temporary soil gas probes set at 5' and 15'.

B18-25
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B19
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
36 N/A
N/A

33.94752, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 DP
DP
GR
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Lean CLAY (CL); some fine-coarse sand, some clay, low plasticity, stiff, wet, dark brown
(4.50') Sandy SILT (ML); some fine sand, nonplastic, stiff, moist, dark brown (9.5') As Above
(14.50') SILT (ML); very stiff, moist, gray
(19.5') As Above
B19-1
B19-5
B19-10
B19-15
B19-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B19
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
36 N/A
N/A

33.94752, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 0.50
(19.5') As Above
(24.5') As Above
(29.5') As Above: hydrocarbon staining observed
(33.50') SILT (ML); few clay, stiff, dry, brown, hydrocarbon staining observed to 35' (39.5') As Above: no staining
B19-30
B19-35
B19-40
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B19
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
50 2.0
Direct Push, Grab
36 N/A
N/A

33.94752, -117.41843
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 DP 0.50
(39.5') As Above: no staining
(49.50') Poorly graded SAND with gravel (SP); some fine-coarse gravel, little silt, dense, saturated, light brown, no odor/stain
(50.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B20
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
36 N/A
N/A

33.94740, -117.41831
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Silty SAND with gravel (SM); some fine-coarse gravel, loose, dry, dark brown (2.50') Lean CLAY (CL); some silt, low plasticity, stiff, dry, dark brown (4.5') As Above
(9.5') As Above
(12') As Above: hydrocarbon staining observed from 12 to 36' (14.50') SILT (ML); few clay, stiff, dry, brown, stained B20-1
B20-5
B20-10
B20-15
B20-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger. Water sample GW20 collected at 36.0-36.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B20
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
36 N/A
N/A

33.94740, -117.41831
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 0.50
(20') As Above: stained
(24.5') As Above: hydrocarbon staining observed
(27.50') Well-graded SAND (SW); fine-coarse grained, few fine-coarse gravel, loose, moist, brown, hydrocarbon staining observed
(29.5') As Above: hydrocarbon staining observed
(34.5') As Above: hydrocarbon staining observed
(35.50') Well-graded SAND (SW); hydrocarbon staining observed (37') As Above: no staining
B20-25
B20-30
B20-35
GW20
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B20
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
36 N/A
N/A

33.94740, -117.41831
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (37') As Above: no staining
(45.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B21
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Hollow Stem Auger
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
25 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94745, -117.41825
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Lean CLAY (CL); some fine-coarse sand, low plasticity, stiff, wet, dark brown (4.50') SILT (ML); some fine sand, stiff, moist, dark brown, hydrocarbon staining observed
(9.5') As Above: hydrocarbon staining observed
(14.50') SILT (ML); very stiff, moist, gray, no staining (19.5') As Above
B21-1
B21-5
B21-10
B21-15
B21-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B21
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Hollow Stem Auger
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
25 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94745, -117.41825
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (19.5') As Above
(25.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B21-25
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B22
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94740, -117.41821
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50
(0.00') Asphalt
(0.50') Silty SAND with gravel (SM); some fine-coarse gravel, loose, dry, dark brown (4.5') As Above
(10') As Above
(14.50') Poorly graded SAND (SP); moist, dark brown
(19.5') As Above
B22-1
B22-5
B22-10
B22-15
B22-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B22
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94740, -117.41821
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (20.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B23
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94754, -117.41817
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Lean CLAY (CL); some fine-coarse sand, low plasticity, medium stiff, wet, dark brown
(4.50') SILT (ML); some fine sand, stiff, moist, dark brown (9.5') As Above
(14.50') SILT (ML); very stiff, moist, gray
(19.5') As Above
B23-1
B23-5
B23-10
B23-15
B23-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B23
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94754, -117.41817
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (20.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B24
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94757, -117.41809
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50
(0.00') Asphalt
(0.50') Silty SAND with gravel (SM); some fine-coarse gravel, few clay, loose, moist, dark brown
(4.50') Lean CLAY with sand (CL); some fine-coarse gravel, medium plasticity, moist, dark brown
(9.50') Silty CLAY (CL-ML); some medium sand, medium plasticity, moist, dark brown (14.50') Silty CLAY (CL-ML); some coarse sand, medium plasticity, moist, dark brown (19.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown B24-1
B24-5
B24-10
B24-15
B24-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger. Water sample GW24 collected at 38.0-38.5 ft bgs.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B24
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94757, -117.41809
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP

0.50 0.50

0.50 (19.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (24.50') Silty CLAY (CL-ML); light brown
(29.50') Silty CLAY (CL-ML); trace fine-coarse gravel, light brown, moist (34.5') As Above
(39.5') As Above: saturated
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B24
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94757, -117.41809
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 (39.5') As Above: saturated
(45.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B25
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 660
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94757, -117.41797
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Lean CLAY (CL); some fine-coarse sand, low plasticity, medium stiff, wet, dark brown
(4.50') SILT (ML); some fine sand, stiff, moist, dark brown (9.5') As Above
(14.50') SILT (ML); very stiff, moist, gray
(19.5') As Above
B25-1
B25-5
B25-10
B25-15
B25-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B25
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/21/2023
6/21/2023
Astech
Direct Push
Geoprobe 660
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94757, -117.41797
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (20.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B26
1 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94769, -117.41837
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP
08:38
08:40
08:45
08:50

0.50 0.50

0.50 0.50
(0.00') Asphalt
(0.50') SILT (ML); medium stiff, dry, dark brown
(4.5') As Above
(8.00') SILT (ML); trace clay, medium stiff, dry, light brown (9.5') As Above
(14.50') Poorly graded SAND (SP); dry, light brown
(19.50') SILT (ML); very stiff, dry, gray
B26-5
B26-15
B26-20
B26-1
B26-10
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B26
2 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94769, -117.41837
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 DP
DP
DP
DP

0.50 0.50

0.50 0.50
(19.50') SILT (ML); very stiff, dry, gray
(25.00') Silty SAND (SM); fine-medium grained, medium dense, moist, gray (30.00') Well-graded SAND (SW); fine-coarse grained, moist (35.00') Silty CLAY (CL-ML); low plasticity, wet, gray
(37.50') Poorly graded SAND (SP); some silt, medium dense, saturated, brown (39.5') As Above
GW26
20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by ABC Liovin using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B26
3 of 3
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
ABC Liovin
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
45 2.0
Direct Push, Grab
38 N/A
N/A

33.94769, -117.41837
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
40 45
50 55
60 DP 0.50
(39.5') As Above
(44.5') As Above
(45.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 40 45
50 55
60 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B27
1 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94779, -117.41802
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
DP
DP

0.50 0.50

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); medium stiff, dry, dark brown
(4.5') As Above
(8.00') SILT (ML); trace clay, medium stiff, dry, light brown (9.5') As Above
(14.50') Poorly graded SAND (SP); dry, light brown
(19.5') As Above
B27-1
B27-5
B27-10
B27-15
B27-20
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B27
2 of 2
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
20 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94779, -117.41802
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
20 25
30 35
40 (20.00') Boring terminated. Temporary soil gas probes set at 5' and 15'. 20 25
30 35
40 Checked by: Eric Cathcart
NOTES: Hole precleared by Weis Environmental using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B28
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 10:55
6/15/2023
Weis Environmental
Hand Auger Rig
Hand Auger
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
5 4.0
Grab
N/A
N/A
N/A

33.94768, -117.41768
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
GR 11:03

0.50 0.50
(0.00') Concrete
(0.50') Silty SAND (SM); mostly fine-medium grained sand, some silt, medium dense, moist, light brown
(4.50') Silty SAND (SM); mostly fine-medium grained sand, some silt, medium dense, moist, light brown
(5.00') Boring terminated. Temporary soil gas probe set at 5'.

B28-5
B28-1
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Weis Environmental using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B29
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 11:08
6/15/2023
Weis Environmental
Hand Auger Rig
Hand Auger
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
5 4.0
Grab
N/A
N/A
N/A

33.94767, -117.41805
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
GR 11:11

0.50 0.50
(0.00') Concrete
(0.50') Well-graded SAND (SW); fine-coarse grained, trace coarse gravel, little clay, loose, moist, brown
(4.50') Well-graded SAND (SW); mostly fine-coarse grained sand, trace coarse gravel, few clay, loose, moist, brown
(5.00') Boring terminated. Temporary soil gas probe set at 5'.

B29-1
B29-5
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Weis Environmental using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B30
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/15/2023 11:15
6/15/2023
Weis Environmental
Hand Auger Rig
Hand Auger
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
5 4.0
Grab
N/A
N/A
N/A

33.94768, -117.41821
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
GR
11:15
11:19

0.50 0.50
(0.00') Concrete
(0.50') Silty SAND with gravel (SM); fine-coarse grained, little fine-coarse gravel, moist, brown
(4.50') Well-graded SAND (SW); fine-coarse grained, trace fine-coarse gravel, little clay, loose, moist, brown
(5.00') Boring terminated. Temporary soil gas probe set at 5'.

B30-1
B30-5
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B31
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94749, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
08:52
08:56
09:01

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); trace fine-coarse sand, some clay, low plasticity, medium stiff, moist, brown
(4.50') SILT (ML); some clay, low plasticity, medium stiff, moist, brown (10') As Above
(14.50') SILT (ML); some clay, low plasticity, moist, dark greenish (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B31-1
B31-5
B31-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B32
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023 9:39
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94777, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
09:34
09:37
09:42

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); trace fine-coarse sand, some clay, low plasticity, medium stiff, moist, brown
(4.50') SILT with sand (ML); some fine sand, few clay, low plasticity, moist, brown (9.5') As Above
(14.50') SILT (ML); trace fine sand, some clay, low plasticity, medium stiff, moist, brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B32-1
B32-5
B32-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B33
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023 9:59
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94804, -117.41636
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
09:59

0.50 0.50
(0.00') Asphalt
(0.50') SILT (ML); trace fine-coarse sand, mostly silt, some clay, low plasticity, medium stiff, moist, brown
(4.50') SILT (ML); trace fine-coarse sand, mostly silt, some clay, low plasticity, medium stiff, moist, brown
(9.5') As Above
(14.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B33-1
B33-5
B33-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B34
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94803, -117.41769
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50
(0.00') Asphalt
(0.50') SILT (ML); stiff, dry, brown
(4.5') As Above
(10') As Above
(14.50') Poorly graded SAND (SP); fine grained, few coarse gravel, very dense, dry, light brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B34-1
B34-5
B34-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B35
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94833, -117.41607
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
10:38
10:40
10:47

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); trace fine-coarse sand, mostly silt, some clay, low plasticity, medium stiff, moist, brown
(4.50') SILT (ML); trace fine-coarse sand, mostly silt, some clay, low plasticity, very stiff, moist, brown
(9.5') As Above
(14.50') Poorly graded SAND (SP); mostly fine grained sand, dense, moist, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B35-15
B35-5
B35-1
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B36
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94832, -117.41668
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
14:00
14:05
14:11

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); some clay, low plasticity, medium stiff, moist, dark brown (4.50') SILT (ML); trace clay, medium stiff, moist, light brown (9.5') As Above
(14.50') SILT (ML); medium stiff, moist, light brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B36-1
B36-5
B36-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B37
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94832, -117.41737
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); few clay, medium plasticity, medium stiff, moist, light brown (4.5') As Above
(14.5') As Above
(15.00') Boring terminated; temporary soil gas probes set at 5' and 15' B37-1
B37-5
B37-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B38
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94831, -117.41804
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP

0.50 0.50
(0.00') Asphalt
(0.50') SILT (ML); stiff, dry, brown
(4.5') As Above
(10') As Above
(14.50') Poorly graded SAND (SP); fine grained, few coarse gravel, very dense, dry, light brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B38-1
B38-5
B38-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B39
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94859, -117.41833
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); stiff, dry, brown
(4.5') As Above
(9.5') As Above
(14.50') Poorly graded SAND (SP); fine grained, few coarse gravel, very dense, dry, light brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B39-1
B39-5
B39-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B40
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94860, -117.41769
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); dry, brown
(4.5') As Above
(14.50') Poorly graded SAND (SP); few coarse gravel, very dense, dry, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B40-1
B40-5
B40-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B41
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94861, -117.41704
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); very stiff, dry, brown
(5') As Above
(10') As Above
(14.50') Poorly graded SAND (SP); few coarse gravel, very dense, dry, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B41-1
B41-5
B41-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B42
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94860, -117.41635
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
11:12
11:16
11:20

0.50 0.50

0.50 (0.00') Asphalt
(0.50') Sandy SILT (ML); some fine-medium sand, mostly silt, medium stiff, moist, brown
(4.50') SILT (ML); some fine-medium sand, medium stiff, moist, brown (9.5') As Above
(14.50') SILT (ML); trace fine-medium sand, mostly silt, some clay, low plasticity, medium stiff, moist, brown
(15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B42-1
B42-5
B42-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B43
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023 11:42
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94889, -117.41606
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
11:42
11:44
11:56

0.50 0.50
(0.00') Asphalt
(0.50') Sandy SILT (ML); some fine-coarse sand, mostly silt, medium stiff, moist, brown (4.50') SILT (ML); some fine-coarse sand, stiff, moist, brown (10') As Above
(14.50') Poorly graded SAND (SP); fine grained, dense, moist, light brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B43-1
B43-5
B43-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B44
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/19/2023
6/19/2023
Astech
Direct Push
Geoprobe 6600
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94888, -117.41670
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP
13:30
13:35
13:39

0.50 0.50
(0.00') Asphalt
(0.50') SILT with sand (ML); few fine-medium sand, dry, brown (4.50') SILT (ML); trace clay, medium stiff, moist, brown (9.5') As Above
(14.50') SILT (ML); trace clay, medium stiff, moist, brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B44-1
B44-5
B44-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B45
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment:

Driller:

Logged By:
6/20/2023
6/20/2023
Astech
Direct Push
Geoprobe
James Wright
Boring Depth (ft):

Boring Diameter (in):

Sampling Method(s):

DTW During Drilling (ft):

DTW After Drilling (ft):

Ground Surface Elev. (ft):

Location (Lat, Long):
15 2.0
Direct Push, Grab
N/A
N/A
N/A

33.94889, -117.41736
DEPTH (ft)

LITHOLOGY
WATER LEVEL
BORING

COMPLETION

COLLECT
Sample Type
Time
Blow Counts
Recovery (ft)
SOIL/ROCK VISUAL DESCRIPTION
MEASURE PID (ppm) Lab Sample
DEPTH (ft)
0 5
10 15
20 GR
DP
DP

0.50 0.50

0.50 (0.00') Asphalt
(0.50') SILT (ML); dry, brown
(4.5') As Above
(9.5') As Above
(14.50') Poorly graded SAND (SP); few coarse gravel, very dense, dry, dark brown (15.00') Boring terminated. Temporary soil gas probes set at 5' and 15'.

B45-1
B45-5
B45-15
0 5
10 15
20 Checked by: Eric Cathcart
NOTES: Hole precleared by Astech using hand auger.

Client:

Project:

Address:

Weis Environmental
Arlington Avenue
5261 Arlington Avenue, Riverside,
CA
BORING LOG
Boring No.

Page:

B46
1 of 1
Drilling Start Date:

Drilling End Date:

Drilling Company:

Drilling Method:

Drilling Equipment: