FAULT STUDY
PROPOSED COMMERCIAL/INDUSTRIAL
BUILDING
Pepper Avenue, South of Foothill Freeway
Rialto, California
for
Howard Industrial Partners
22885 Savi Ranch Parkway Suite E Yorba Linda California 92887 voice: (714) 685-1115 fax: (714) 685-1118 www.socalgeo.com
March 22, 2021
Howard Industrial Partners
1944 North Tustin Street, Suite 122
Orange, California 92865
Attention: Mr. Mike Tunney
Vice President
Project No.: 20G234-2
Subject: Fault Study
Proposed Commercial/Industrial Building
Pepper Avenue, South of Foothill Freeway
Rialto, California
Mr. Tunney:
In accordance with your request, we have conducted a fault study at the subject site. We are pleased to present this report summarizing the conclusions and recommendations developed from our investigation.
We sincerely a ppreciate the opportunity to be of service on this project. We look forward to providing additional consulting services during the course of the project. If we may be of further assistance in any manner, please contact our office.
Respectfully Submitted,
SOUTHERN CALIFORNIA GEOTECHNICAL, INC.
Daryl Kas, CEG 2467
Senior Geologist
Robert G. Trazo, GE 2655
Principal Engineer
Distribution: (1) Addressee
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
TABLE OF CONTENTS
1.0 INTRODUCTION 1
1.2 Site Description 1
1.3 Proposed Development 2
2.0 SUBSURFACE INVESTIGATION 4
3.0 HISTORICAL AERIAL PHOTOGRAPH REVIEW 6
4.0 SUMMARY OF GEOLOGIC CONDITIONS 7
4.1 Regional Geology 7
4.2 Regional Faulting 7
4.4 Sediment Age 9
4.5 On-Site Faulting 9
5.0 CONCLUSIONS AND RECOMMENDATIONS 11
6.0 GENERAL COMMENTS 12
7.0 REFERENCES 13
APPENDICES
A Plate 1: Site Location Map
Plate 2: Trench Location Plan
Plate 3: Geologic Map (Miller, 2001)
Plate 4: Geologic Map (Dibblee, 2004)
Plate 5: Alquist-Priolo Earthquake Fault Zone Map
Plate 6: San Bernardino County Geologic Hazards Map
B Trench Logs
C Historical Aerial Photographs
D Plate 7: Density Test Location Plan
Table 2: Summary of Field Density Tests
Table 3: Summary of Moisture Density Relationships
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
1.0 INTRODUCTION
1.1 Purpose and Scope
The subject site is located within an Alquist-Priolo earthquake fault zone and a San Bernardino County fault zone. Therefore, a fault study was required to be performed within the area of the proposed development. This report presents the results of our fault study for the proposed commercial/industrial building in Rialto, California. The purpose of our study was to evaluate the possible presence of on -site faulting and to provide conclusions and appropriate recommendations. Our scope of services included:
• Review of pertinent available geologic and geotechnical literature, maps, and aerial photographs.
• Excavation and logging of two (2) fault trenches across the proposed development area to a maximum depth of approximately 18 to 20 ± feet below existing site grade. The trenches extended from 65± feet south west of the proposed building to 35± feet northeast of the proposed building, in a direction perpendicular to the mapped trace of the San Bernardino segment of the San Jacinto fault zone (SJFZ).
• Geologic review and analysis of the collected data.
• Preparation of this report presenting our findings and conclusions with regard to our fault investigation.
1.2 Site Description
The subject site is located on the east side of Pepper Avenue, approximately 500 feet south of the intersection of Pepper Avenue and the Foothill Freeway (CA-210) in Rialto, California. The site is bounded to the north and east by vacant lots, to the west by Pepper Avenue, and to the south by a vacant lot and a detention basin with an above -ground storage tank (AST). The general location of the site is illustrated on the Site Location Map, enclosed as Plate 1 of this report.
The site consists of an “L”-shaped parcel, 24.23± acres in size. The site is currently vacant and undeveloped. The ground surface cover consists of exposed soil with sparse to moderate native grass and weed growth. Tree trunks and debris are scattered around the northern region of the site.
Topographic information by Inland Aerial Surveys, Inc. was provided by the client. The site topography ranges from 1267± feet mean sea level (msl) located in the southeast corner of the site to 1290± msl in the northwest corner of the site. The site generally slopes downward to the southeast at a gradient of 1½± percent.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
1.3 Proposed Development
Based on a conceptual site plan, prepared by Architects Orange (AO), provided to our office by the client, the subject site will be developed with one (1) new commercial/industrial building, 493,000± ft² in size, located in the north -central area of the site. Dock -high doors will be constructed along portions of the north and south building walls. The building will be surrounded by asphaltic concrete pavements in the parking and drive lanes, Portland cement concrete pavements in the loading dock areas, concrete flatwork, and limited areas of landscape planters throughout.
Detailed structural information has not been provided. It is assumed that the new building will be a single-story structure of tilt -up concrete construction, supporte d on a conventional shallow foundation system with a concrete slab -on-grade floor. Based on the assumed construction, maximum column and wall loads are expected to be on the order of 80 to 100 kips and 4 to 7 kips per linear foot, respectively.
Grading plans for the proposed development were not available at the time of this report. No significant amounts of below-grade construction such as basements or crawl spaces are expected to be included in the proposed development. Based on the assumed topography, cuts and fills of 7 to 10± feet are expected to be necessary to achieve the proposed site grades.
1.4 Previous Studies
A geotechnical feasibility study was previously conducted for this site by Southern California Geotechnical. This report is identified as follows:
Geotechnical Feasibility Investigation, Proposed Commercial/Industrial Building, Pepper Avenue, South of Foothill Freeway, Rialto, Californi a, prepared by Southern California Geotechnical, Inc. (SCG), prepared for Howard Industrial Partners, SCG Project No.20G234-1 dated December 15, 2020.
As part of this investigation, a total of four (4) borings were drilled to a depth of 50± feet below the existing site grades. SCG reported that native alluvium was encountered at the ground surface at all of the boring locations, extending to at least the maximum depth explored of 50± feet below the existing site grades. The near -surface alluvium g enerally consisted of very loose to medium dense silty sands, sandy silts, gravelly sands , and well-graded sands, with varying silt and gravel content, extending to depths of 7 to 10± feet. The underlying alluvium generally consisted of medium dense to dense silty sands, sandy silts, and well graded sands with varying fine gravel and silt content, extending to depths of 15 to 20± feet. At greater depths, the alluvial soils generally consisted of dense to very dense silty sands, gravely sands, sandy gravels, and well graded sands, with varying silt, gravel and cobble content.
Free water was not encountered during the drilling of any of the borings. Based on the lack of any water within the borings and the moisture contents of the recovered soil samples, the static groundwater was considered to have existed at a depth in excess of 50± feet at the time of the subsurface exploration.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
The SCG geotechnical feasibility study presented preliminary grading, foundation, and floor slab design recommendations based on the conditions encountered at the boring locations. It should be noted that no groundwater discrepancies, fault scarps, fault line scarps, or any other indicators of faulting were observed during the feasibility stud y. Accordingly, the preliminary geotechnical recommendations were made under the assumption that no active faulting occurred on the site.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
2.0 SUBSURFACE INVESTIGATION
The major purpose of the subsurface investigation was to determine if any faults are present at the site and; if so, what is their relative activity (time of last offset). Accordingly, two (2) trenches were excavated at the site to depths of 18 to 20± feet. The t wo exploratory trenches were excavated and logged in detail by staff geologists and a certified engineering geologist from our firm to evaluate the possible presence of on -site faulting. Charcoal discovered within the soils near the bottom of the exploratory trenches allowed for radiocarbon dating.
2.2 Fault Trenching and Logging
The two trenches were excavated across the proposed development as follows:
Trench No. Length (feet) Depth (feet) Orientation
T-1 430 18 to 20 N 56° E
T-2 948 18 to 20 N 57° E
The trenches were excavated in an orientation that is roughly perpendicular to the projection of the San Bernardino section of the San Jacinto fault zone. This section of the San Jacinto fault zone is inferred to extend into or near the site (https://usgs.maps.arcgis.com). The approximate locations of the fault trenches are presented on the Trench Location Plan (Plate 2). This allowed for a thorough assessment of the proposed development with regard to possible faults that may cross the proposed development. Cross-sections of the trenches are presented in the enclosed Fault Investigation Trenches (Plate B-1, B-2a, and B-2b).
The trenches were excavated using a track -mounted excavator equipped with a 48 -inch-wide bucket. The trenches wer e excavated with approximately 4 -foot-wide benches on each side of the trench every 4± vertical feet to allow for SCG personnel to safely log the trench. The trenches were labeled with stations at 5-foot horizontal intervals.
The trench walls were scraped using picks and shovels to remove smears and gouge marks left by the excavator. To prepare a graphic log of the trench, we used the horizontal stations as a reference to scale the trench walls and the geologic features exposed at a 1 inch to 5-foot scale log. The trench location was surveyed using a GPS device.
2.3 Backfilling of Fault Trench
After the trenches were logged, both of the trenches were backfilled and compacted. Backfilling operations occurred between January 21, 2021 and January 27, 2021 for Trench T-1 and between February 14, 2021 and February 18, 2021 for Trench T-2. The trenches were backfilled with the previously excavated on-site soils. The soil was moisture conditioned as necessary and compacted using a loader and a vibratory roller in 12 inch lifts. Moisture-density tests indicate that the fill soils were compacted to at least 90 percent of the ASTM D-1557 maximum dry density. In place density testing of the structural fill was performed using the Nuclear test method (ASTM D-2922- 81), referenced to the maximum dry density values obtained by the Modified Proctor method Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
(ASTM D-1557-91). The density test locations are shown on the enclosed Density Test Location Plan, Plate 7 in Appendix D of this report. Moisture density test results are presented on Table 1, enclosed in Appendix D . In addition, data regarding the soil t ypes used as structural fill are presented on Table 2 in Appendix D.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
3.0 HISTORICAL AERIAL PHOTOGRAPH REVIEW
Historical aerial photographs provided by San Bernardino County Flood Control District. The stereographic aerial photographs were review ed to characterize site geomorphology and topography and surrounding vicinity prior to urbanization. Relative topographic expression can be interpreted using stereo aerial photographs.
Photographs from the San Bernardino County Flood Control District Aerial from the following years were available for review: 1938, 19 69, 1970, and 1978. Copies of the 1938, 19 69, and 1978 aerial photographs are provided in Appendix C of this report. A brief summary of these aerial photographs reviewed is presented below.
The site appears to have been utilized for agricultural purposes, presumably citrus orchards, prior to the earliest photograph in 1938. The site appears to have been vacant and undeveloped in the 1969 photograph until the most recent photograph in 1978. A topographic linear feature was visible in all of the photographs reviewed. The topographic linear feature trends northwe st- southeast and is located approximately 725± feet southwest of the subject site. This topographic linear feature is located in a similar location, parallel to and coinciding with the mapped trace of the San Bernardino segment of the San Jacinto fault zone (SJFZ) on the geologic map (Dibblee, 2004). This topographic linear feature could be fault scarp or fault line scarp of the SJFZ. It should be noted that no topographic feature was observed on the subject site during the historical aerial photographic analysis.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
4.0 SUMMARY OF GEOLOGIC CONDITIONS
4.1 Regional Geology
The subject site is located within the Peninsular Ranges physiographic provinces of California.
The Peninsular Ranges province consists of several northwesterly -trending ranges in the southwestern California. The province is truncated to the north by the east -west trending Transverse Ranges. Prior to the mid-Mesozoic, the region was covered by seas and thick marine sedimentary and volcanic sequences were deposited. The bedrock geology tha t dominates the elevated areas of the Peninsular Ranges consists of high -grade metamorphic rocks intruded by Mesozoic plutons. During the Cretaceous, extensive mountain building occurred during the emplacement of the southern California batholith. The Peninsular Ranges have been significantly disrupted by Tertiary and Quaternary strike-slip faulting along the Elsinore and San Jacinto faults.
This tectonic activity has resulted in the present terrain.
The regional geologic conditions were obtained from two primary sources. A portion of the Geologic Map of the San Bernardino North 7.5’ Quadrangle, San Bernardino County, California, by Fred K. Miller, Jonathan C. Matti, and Scott E. Carson in 2001 and the Geologic Map of the San Bernardino North/North ½ of the San Bernardino South Quadrangles, San Bernardino County, California, by Thomas W. Dibblee Jr. in 2004 are presented as Plate 3 and Plate 4 of this report, respectively. The Miller map indicates that the site is underlain by Holocene and late Pleistocene age, young alluvial-valley deposits Map Symbol Qya4). These deposits are described as slightly to moderately dissected, consolidated to cemented deposits of angular to sub-angular silt, sand, and pebbles. The Dibblee map indicates that the site is located within the Lytle Creek wash and is underlain by Holocene-age surficial sediments (Map Symbol Qg). These deposits are described as alluvial gravel and sand of stream channels. A buried segment of the SJFZ is mapped 775± feet northeast of the subject site on the Miller map. A segment of the San Jacinto fault is mapped 650± feet southwest of the subject site and another segment of the San Jacinto fault is mapped 7500± feet northeast of the site on the Dibblee map.
4.2 Regional Faulting
There are two main structural geologic features on or near the subject site, the SJFZ and the San Andreas Fault Zone (SAFZ). The site is located within the SJFZ. The SJFZ extends from El Centro, California to San Bernardino, California. The SJFZ is a northwest-southeast trending, right-lateral, strike-slip fault system. Information presented on the Southern California Earthquake Data Center (SCEDC) website operated by CalTech has assigned the following parameters to the San Jacinto Fault:
▪ Length: 210 kilometers
▪ Slip Rate: 7 to 17 millimeters per year
▪ Probable Magnitudes (MW): 6.5 to 7.5
▪ Recurrence Interval: Between 100 and 300 years, per segment
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
Several of the large segments of the SJFZ have individual identities. One of the northern segments of the SJFZ is identified as the San Bernardino segment. This segment of the SJFZ is nearest the subject site. This section of the fault is a right -lateral fault that trends N58ºW with an average dip of 65 degrees to the southwest. The average slip rate is 5 millimeters per year. In addition, the recurrence interval is 107 years (https://earthquake.usgs.gov).
The SAFZ is the other major structural fe ature near the subject site. The SAFZ is a northwest - southeast trending, right-lateral, strike-slip fault system (SCEDC). The SAFZ is located 4.5± miles northeast of the subject site. The SCEDC has assigned the following parameters to the San Andreas Fault:
▪ Length: 1200 kilometers
▪ Slip Rate: 20 to 35 millimeters per year
▪ Probable Magnitudes (MW): 6.8 to 8.0
▪ Recurrence Interval: 140 years
4.3 Site Specific Geology
The subject site is located within the Lytle Creek wash. Lytle Creek extends from the eastern San Gabriel mountains, trending northwest-southeast to the Santa Ana river. Based on our subsurface exploration, and review of pertinent geologic and geotechnical literature, the site is underlain by a surficial layer artificial fill and alluvial soils characteristic of wash deposits. A description of the units is presented below.
Artificial Fill
Artificial fill was encountered at Trench No. T-2 extending from the ground surface to depths of 3 to 5± feet. The artificial fill consists of loose, fine sands to silty fine sands with trace amounts of medium to coarse sands and varying amounts debris including roots, concrete, and brick fragments.
Alluvium
Native alluvium was encountered at the ground surface at Trench No. T -1 and b eneath the artificial fill at Trench No. T-2. The alluvium consists of interbedded loose to medium dense fine sands to silty fine sands in the upper 10 to 15± feet. The deeper alluvial soils consist of loose to medium dense fine to coarse sands and gravelly fine to coarse sands with occasional to extensive cobble content. The near surface alluvium generally consists of unbroken sediments which the deeper alluvium generally consists of sand and gravel layers that pinch out horizontally which is characteristic of channel deposits. The sand and gravel layers are predominating in the deeper alluvium in the northeastern area of the site, closer to Lytle Creek. It should be noted that three (3) charcoal samples were collected within the deeper alluvial soils at Trench No. T-2.
Groundwater
Free water was not encountered during the excavation of the two trenches. In addition, as previously stated, no groundwater was encountered during the drilling of the borings during the previous geotechnical feasibility study. The static groundwater was considered to have existed at a depth in excess of 50± feet at the time of the previous subsurface exploration.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
As part of our research for the feasibility study, we reviewed readily available groundwater data in order to determine regional groundwater depths. The primary reference used to determine the groundwater depths in the subject site area is the California Department of Water Resources website, http://www.water.ca.gov/waterdatalibrary/. The nearest monitoring well is located approximately 800 feet southeast from the site. Water level readings within this monitoring well indicates a high groundwater level of 418 feet below the ground surface in September 2020.
4.4 Sediment Age
A total of three (3) charcoal samples were collected from Trench T -2. These samples were submitted to DirectAMS a radiocarbon dating service. The results of the testing is below:
Sample Radiocarbon Age (before present)
T-2 @17.5 feet 1967
T-2 @ 16.5 feet 2171
T-2 @ 17 feet 2160
Based on the results of the radiocarbon dating, the deeper alluvial soils have an average radiocarbon age of 2,099 years before present.
4.5 On-Site Faulting
Our discussion of on-site faulting on the site is prefaced with a discussion of California legislation and state policies concerning the classification and land -use criteria associated with faults. By definition of the California Geological Survey (CGS), an active fault is a fault which has had surface displacement with Holocene time (about the last 11,700 years). The State Geologist has defined a potentially active fault as any fault considered to have been active during Quaternary time (the last 1,600,000 years) but that has not been proven to be active or inactive. This definition is used in deli neating Fault-Rupture Hazard Zones as mandated by the Alquist -Priolo Earthquake Fault Zoning Act of 1972 and is most recently subsequently revised in 1997 (Hart, 1997). The intent of this act is to assure that unwise urban development does not occur across the traces of active faults.
Based on our review of the Special Study Zones Map of the San Bernardino North Quadrangle , published by the CGS, the subject site is located within a designated earthquake fault zone as defined by the Alquist-Priolo Earthquake Fault Zoning Act. In accordance with the provisions of the Act, all new construction of habitable structures within the Fault Rupture Hazard Zone will be preceded by a fault trenching investigation to determine the presence of on -site strands of any active or potentially active fault and to determine the need for a structural setback. The general location of the site relative to the SJFZ is illustrated on the Alquist-Priolo Fault Zone Map, included as Plate 5 of this report.
Based on our review of the San Bernardino County Geologic Hazards Overlay Map of the San Bernardino North Quadrangle FH22, published by San Bernardino County, the site is also located Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
within a County of San Bernardino fault zone. The general location of the site relative to the SJFZ is illustrated on the San Bernardino County Fault Zone Map, included as Plate 6 of this report.
Approximately 18 to 20± feet of alluvial sediments were exposed at Trench Nos. T -1 and T-2.
The upper 10 to 12± feet generally con sisted of unbroken sediments. The deeper alluvial soils were characteristic of channel deposits with interbedded sand and gravel layers that pinch out horizontally. The cobbles were generally rounded and sub -rounded and were generally concentrated in the l ower section of each deposition al channel. None of the deeper alluvial channel deposits were offset. As previously stated, the sediments exposed near the bottom of Trench Nos. T -1 and T -2 were deposited approximately 2,100 years before present and the recurrence interval for the San Bernardino segment of the San Jacinto fault is 107 years. Based on the recurrence interval with respect to the approximate date of the deeper exposed sediments, we would expect that an offset in the deeper exposed sediments woul d be evident if the fault transected the subject site. Therefore, the San Bernardino segment of the SJFZ is not considered to transect the subject site.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
5.0 CONCLUSIONS AND RECOMMENDATIONS
5.1 Conclusions
We have reviewed readily available reports, maps, and performed a subsurface fault study of the subject site to evaluate the potential for surface faulting at the site. There is positive evidence that no active or potentially active faults transect the subject site. This conclusion is based on the following factors:
• Historical a erial stereographic photograph analysis indicates that a linear topographic feature is located 750± feet southwest of the subject site. This linear topographic feature is parallel to and coincides with the mapped trace of the San Jacinto fault on the Dibblee map. No linear topographic depressions or features were visible on the subject site.
• No evidence of on-site faulting was encountered within the fault trenches, which extended from 65± feet south west of the prop osed building to 35± northeast of the proposed building, in a direction perpendicular to the mapped trace of the San Bernardino segment of the SJFZ.
• Based on the recurrence interval for the San Bernardino segment of the SJFZ (107 years) with respect to t he approximate date of the deeper exposed sediments (2,100 years before present), we would expect that an offset in the deeper exposed sediments would be evident if an active fault transected the subject site.
5.2 Recommendations
Based on the results of this fault study, positive evidence indicates that neither active nor potentially active faults occur at the proposed development. Therefore, we recommend that development proceed without structural setbacks related to active or potentially active faults. The conclusions and recommendations presented in the previously submitted geotechnical investigation are thus considered valid for the proposed development.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
6.0 GENERAL COMMENTS
This report has been prepared for use by the client, in order to aid in the evaluation of this property and to assist the architects and engineers in the design and preparation of the project plans and spe cifications. This report may be provided to the contractor(s) and other design consultants to disclose information relative to the project. However, this report is not intended to be utilized as a specification in and of itself, without appropriate inter pretation by the project architect, civil engineer, and/or structural engineer. The reproduction and distribution of this report must be authorized by the client and Southern California Geotechnical, Inc. Furthermore, any reliance on this report by an un authorized third party is at such party’s sole risk, and we accept no responsibility for damage or loss which may occur.
The analysis of this site was based on a subsurface profile interpolated from limited discrete soil samples. While the materials encountered in the project area are considered to be representative of the total area, some variations should be expected between boring and trench locations and sample depths. If the conditions encountered during construction vary significantly from those detailed herein, we should be contacted immediately to determine if the conditions alter the recommendations contained herein.
This report has been based on assumed or provided characteristics of the proposed development.
It is recommended that the owner, client, architect, structural engineer, and civil engineer carefully review these assumptions to ensure that they are consistent with the characteristics of the proposed development. If discrepancies exist, they should be brought to our attention to verify that they do not affect the conclusions and recommendations contained herein. We also recommend that the project plans and specifications be submitted to our office for review to verify that our recommendations have been correctly interpreted.
The analysis, conclusions, and recommendations contained within this report have been promulgated in accordance with generally accepted professional geological and geotechnical engineering practice. No other warranty is implied or expressed.
Proposed Commercial/Industrial Building – Rialto, CA
Project No. 20G234-2
7.0 REFERENCES
California Division of Mines and Geology (CDMG), 197 4, Earthquake Fault Zones (Alquist -Priolo Earthquake Fault Zoning Act: San Bernardino North Quadrangle, CDMG, Scale 1:24,000.
Dibblee, T.W., 2004, Geologic Map of the San Bernardino North/North ½ San Bernardino South Quadrangles, San Bernardino County, California, published by the Dibblee Geologic Foundation, Scale 1:24,000.
Geotechnical Feasibility Study, Proposed Commercial/Industrial Building, Pepper Avenue, South of Foothill Freeway, Rialto, California, prepared by SCG, prepared for Howard Industrial Partners, SCG Project No. 20G234-1, dated December 15, 2020.
Miller, F.K., Matti, J.C., and Carson, S.E., 2001, Geologic Map of the San Bernardino North 7.5’ Quadrangle, published by CDGM, OFR 01-131, Scale 1:24,000.
Southern California Earthquake Data Center, www.data.scec.org, San Jacinto Fault.
U.S. Quaternary Faults, https://usgs.maps.arcgis.com, maintained by United States Geologic Survey (USGS).
Quaternary Fault and Fold Database, https://earthquake.usgs.gov/, maintained by USGS.
SITE
PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGSCALE: 1" = 2000'DRAWN: DRKCHKD: RGTSCG PROJECT20G234-2PLATE 1 SITE LOCATION MAPRIALTO, CALIFORNIASOURCE: USGS TOPOGRAPHIC MAPS OF THE SANBERNARDINO NORTH QUADRANGLES, SAN BERNARDINOCOUNTY, CALIFORNIA, 2018.
B-1B-2B-3
B-4
TRENCH T-2TRENCH T-1
SCALE: 1" = 100'DRAWN: DRKCHKD: RGTPLATE 2SCG PROJECT20G234-2
RIALTO, CALIFORNIAPROPOSED COMMERCIAL/INDUSTRIAL BUILDINGTRENCH LOCATION PLAN NORTHSoCalGeo
GEOTECHNICAL LEGENDPREVIOUS BORING LOCATION
NOTE: SITE PLAN PREPARED BY ARCHITECTS ORANGE
(SCG PROJECT NO. 20G234-1)APPROXIMATE TRENCH LOCATION
SITE
SCALE: 1" = 2000'DRAWN: DRKCHKD: RGTPLATE 3SCG PROJECT20G234-2
RIALTO, CALIFORNIAPROPOSED COMMERCIAL/INDUSTRIAL BUILDINGGEOLOGIC MAP GEOLOGIC MAP OF THE SAN BERNARDINO NORTH7.5' QUADRANGLE, SAN BERNARDINO COUNTY,CALIFORNIA, FRED K. MILLER, JONATHAN C. MATTI,AND SCOTT E. CARSON (2001) SITE
SCALE: 1" = 2000'DRAWN: DRKCHKD: RGTPLATE 4SCG PROJECT20G234-2
RIALTO, CALIFORNIAPROPOSED COMMERCIAL/INDUSTRIAL BUILDINGGEOLOGIC MAP GEOLOGIC MAP OF THE SAN BERNARDINO NORTH /NORTH 1/2 OF SAN BERNARDINO SOUTHQUADRANGLES BY THOMAS W. DIBBLEE, JR. (2004) SITE
PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGSCALE: 1" = 2,000'DRAWN: DRKCHKD: RGTSCG PROJECT20G243-2PLATE 5
ALQUIST-PRIOLO EARTHQUAKE FAULT ZONE MAPRIALTO, CALIFORNIA SOURCE: "STATE OF CALIFORNIA SPECIAL STUDIESZONES, SAN BERNARDINO NORTH QUADRANGLE"DATED JULY 1, 1974 AND JUNE 1, 1995.
SITE
PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGSCALE: 1" = 2,000'DRAWN: DRKCHKD: RGTSCG PROJECT20G243-2PLATE 6
SAN BERNARDINO COUNTY GEOLOGIC HAZARD MAPRIALTO, CALIFORNIA SOURCE: "SAN BERNARDINO COUNTY LAND USE PLAN,GENERAL PLAN, GEOLOGIC HAZARDS OVERLAY, SANBERNARDINO NORTH QUADRANGLE, FH22"
TRENCH LOG LEGEND
SAMPLE TYPE GRAPHICAL
SYMBOL SAMPLE DESCRIPTION
AUGER
SAMPLE COLLECTED FROM AUGER CUTTINGS, NO FIELD
MEASUREMENT OF SOIL STRENGTH. (DISTURBED)
CORE
ROCK CORE SAMPLE: TYPICALLY TAKEN WITH A
DIAMOND-TIPPED CORE BARREL. TYPICALLY USED
ONLY IN HIGHLY CONSOLIDATED BEDROCK.
GRAB
SOIL SAMPLE TAKEN WITH NO SPECIALIZED
EQUIPMENT, SUCH AS FROM A STOCKPILE OR THE
GROUND SURFACE. (DISTURBED)
CS
CALIFORNIA SAMPLER: 2-1/2 INCH I.D. SPLIT BARREL
SAMPLER, LINED WITH 1-INCH HIGH BRASS RINGS.
DRIVEN WITH SPT HAMMER. (RELATIVELY
UNDISTURBED)
NSR
NO RECOVERY: THE SAMPLING ATTEMPT DID NOT
RESULT IN RECOVERY OF ANY SIGNIFICANT SOIL OR
ROCK MATERIAL.
SPT
STANDARD PENETRATION TEST: SAMPLER IS A 1.4
INCH INSIDE DIAMETER SPLIT BARREL, DRIVEN 18
INCHES WITH THE SPT HAMMER. (DISTURBED)
SH
SHELBY TUBE: TAKEN WITH A THIN WALL SAMPLE
TUBE, PUSHED INTO THE SOIL AND THEN EXTRACTED.
(UNDISTURBED)
VANE
VANE SHEAR TEST: SOIL STRENGTH OBTAINED USING
A 4 BLADED SHEAR DEVICE. TYPICALLY USED IN SOFT
CLAYS-NO SAMPLE RECOVERED.
COLUMN DESCRIPTIONS
DEPTH: Distance in feet below the ground surface.
SAMPLE: Sample Type as depicted above.
BLOW COUNT: Number of blows required to advance the sampler 12 inches using a 140 lb hammer with a 30-inch drop. 50/3” indicates penetration refusal (>50 blows) at 3 inches. WH indicates that the weight of the hammer was sufficient to push the sampler 6 inches or more.
POCKET PEN.: Approximate shear strength of a cohesive soil sample as measured by pocket penetrometer.
GRAPHIC LOG: Graphic Soil Symbol as depicted on the following page.
DRY DENSITY: Dry density of an undisturbed or relatively undisturbed sample in lbs/ft3.
MOISTURE CONTENT: Moisture content of a soil sample, expressed as a percentage of the dry weight.
LIQUID LIMIT: The moisture content above which a soil behaves as a liquid.
PLASTIC LIMIT: The moisture content above which a soil behaves as a plastic.
PASSING #200 SIEVE: The percentage of the sample finer than the #200 standard sieve.
UNCONFINED SHEAR: The shear strength of a cohesive soil sample, as measured in the unconfined state.
SM
SP
COARSE
GRAINED
SOILS
SW
TYPICAL
DESCRIPTIONS
WELL-GRADED GRAVELS, GRAVEL -
SAND MIXTURES, LITTLE OR NO
FINES
SILTY GRAVELS, GRAVEL - SAND -
SILT MIXTURES
LETTERGRAPH
POORLY-GRADED GRAVELS,
GRAVEL - SAND MIXTURES, LITTLE
OR NO FINES
GC
GM
GP
GW
POORLY-GRADED SANDS,
GRAVELLY SAND, LITTLE OR NO
FINES
SILTS
AND
CLAYS
MORE THAN 50%
OF MATERIAL IS
LARGER THAN
NO. 200 SIEVE
SIZE
MORE THAN 50%
OF MATERIAL IS
SMALLER THAN
NO. 200 SIEVE
SIZE
MORE THAN 50%
OF COARSE
FRACTION
PASSING ON NO.
4 SIEVE
MORE THAN 50%
OF COARSE
FRACTION
RETAINED ON NO.
4 SIEVE CLAYEY GRAVELS, GRAVEL - SAND -
CLAY MIXTURES
FINE
GRAINED
SOILS
SYMBOLSMAJOR DIVISIONS
SOIL CLASSIFICATION CHART
PT
OH
CH
MH
OL
CL
ML
CLEAN SANDS
SC
SILTY SANDS, SAND - SILT
MIXTURES
CLAYEY SANDS, SAND - CLAY
MIXTURES
INORGANIC SILTS AND VERY FINE
SANDS, ROCK FLOUR, SILTY OR
CLAYEY FINE SANDS OR CLAYEY
SILTS WITH SLIGHT PLASTICITY
INORGANIC CLAYS OF LOW TO
MEDIUM PLASTICITY, GRAVELLY
CLAYS, SANDY CLAYS, SILTY CLAYS,
LEAN CLAYS
ORGANIC SILTS AND ORGANIC
SILTY CLAYS OF LOW PLASTICITY
INORGANIC SILTS, MICACEOUS OR
DIATOMACEOUS FINE SAND OR
SILTY SOILS
INORGANIC CLAYS OF HIGH
PLASTICITY
ORGANIC CLAYS OF MEDIUM TO
HIGH PLASTICITY, ORGANIC SILTS
PEAT, HUMUS, SWAMP SOILS WITH
HIGH ORGANIC CONTENTS
SILTS
AND
CLAYS
GRAVELS WITH
FINES
SAND
AND
SANDY
SOILS (LITTLE OR NO FINES)
SANDS WITH
FINES
LIQUID LIMIT
LESS THAN 50
LIQUID LIMIT
GREATER THAN 50
HIGHLY ORGANIC SOILS
NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS GRAVEL
AND
GRAVELLY
SOILS
(APPRECIABLE
AMOUNT OF FINES)
(APPRECIABLE
AMOUNT OF FINES)
(LITTLE OR NO FINES)
WELL-GRADED SANDS, GRAVELLY
SANDS, LITTLE OR NO FINES
CLEAN
GRAVELS
0+0
0+05
0+10
0+15
0+20
0+25
0+30
0+35
0+40
0+45
0+50
0+55
0+60
0+65
0+70
0+75
0+80
0+85
0+90
0+95
1+00
1+05
1+10
1+15
1+20
1+25
1+30
1+35
1+40
1+45
1+50
1+55
1+60
0(FT)
15 20
Qal1
Qal1
Qal1
Qal2Qal2
Qal2
Qal2
Qal3
Qal5
Qal3Qal3
Qal3
Qal9
Qal9
Qal6
Qal14Qal15
Qal22
Qal20Qal21
Qal22Qal25Qal29Qal28
Qal5
Qal34
Qal32Qal28
Qal27Qal25Qal21
Qal21
Qal22
Qal29
Qal26Qal20
Qal6
Qal7
Qal13
Qal14
Qal15
Qal18
Qal19
Qal22
Qal22Qal21Qal21
Qal21
Qal20Qal29
Qal29
Qal28
Qal25Qal27
Qal21Qal21Qal22Qal24
Qal27Qal26
Qal26Qal27
Qal27
Qal27
Qal30
Qal30
Qal25
Qal21
Qal5Qal6Qal9
Qal12
Qal10
Qal14
Qal13
Qal15
Qal18Qal21Qal21
Qal24
Qal22Qal24
Qal21Qal21
Qal21
Qal25
Qal25
Qal27
Qal30
Qal32Qal34
Qal34
Qal33Qal31
Qal27Qal34 Qal21Qal21
Qal23
Qal5Qal6
Qal9
Qal10
Qal14
Qal14
Qal17
Qal21Qal21Qal25
Qal22Qal30
Qal34
Qal35
Qal20
Qal20 Qal21
Qal23
Qal33
Qal23
Qal34
Qal1
Qal2Qal9
Qal14
Qal22
Qal28
Qal25
Qal29Qal28
Qal22 Qal15
Qal2Qal3 Qal1
Qal5Qal6
Qal39Qal19
Qal1
Qal2Qal9
Qal24
Qal18
Qal25
BENCH
BENCHBENCHBENCH5
10 Obstruction ObstructionObstructionObstruction Obstruction 1+60
1+65
1+70
1+75
1+80
1+85
1+90
1+95
2+00
2+05
2+10
2+15
2+20
2+25
2+30
2+35
2+40
2+45
2+50
2+55
2+60
2+65
2+70
2+75
2+80
2+85
2+90
2+95
3+00
3+05
3+10
3+15
3+20
Qal1
Qal1
Qal1
Qal1
Qal2
Qal2
Qal3
Qal6
Qal3
Qal13Qal20
33 Qal24Qal30
Qal25
Qal28Qal27
Qal23
Qal21
Qal21
Qal21 Qal22Qal12
Qal18
Qal33 Qal34
Qal6Qal9
Qal10
Qal12
Qal18
Qal10
Qal7
Qal8
Qal5
Qal21Qal20
Qal23
Qal21
Qal25
Qal20Qal20Qal20
Qal30
Qal30Qal29Qal35
Qal35Qal30Qal30
Qal34
Qal34
Qal34
Qal34Qal29
Qal22
Qal21
Qal21
Qal22
Qal21
Qal2
Qal3Qal5
Qal8
Qal9Qal18Qal22
Qal20
Qal20
Qal20Qal20
Qal21
Qal20Qal20Qal25 Qal30
Qal29
Qal33
Qal33
Qal34
Qal36
Qal30
Qal22Qal21
Qal26
Qal26
Qal26
Qal27
Qal24
Qal30
Qal30Qal34
Qal5Qal6
Qal9
Qal14
Qal13Qal8
Qal9
Qal11
Qal18Qal18
Qal18Qal22
Qal22
Qal20
Qal21Qal20Qal21
Qal21
Qal22
Qal28Qal29
Qal26
Qal31
Qal33Qal26
Qal21
Qal21
Qal21
Qal23
Qal22
Qal24Qal20Qal20Qal28
Qal34
Qal16
Qal22Qal33
Qal1
Qal9
Qal22Qal33
Qal1Qal2
Qal23
Qal30
Qal25Obstruction ObstructionObstruction Obstruction
3+25
3+30
3+35
3+40
3+45
3+50
3+55
3+60
3+65
3+70
3+75
3+80
3+85
3+90
Qal1
Qal2
Qal3
Qal4
Qal5
Qal6
Qal8Qal9
Qal12
Qal11
Qal12Qal16
Qal18
Qal22
Qal21
Qal21
Qal22 22Qal23Qal26Qal34
Qal23Qal21
Qal10
Qal21
Qal1
Qal2
Qal3
Qal4Qal5Qal3Qal6Qal8
3+95
4+00
4+05
4+10
4+15
4+20
4+25
4+30
Qal3
Qal3
Qal3
Qal3
Qal5
Qal5 Qal4
Qal4
Qal8
Qal8
Qal6
Qal6
Qal9
Qal12
Qal9
Qal9
Qal16
Qal18
Qal18
Qal22
Qal22
Qal22
Qal22
Qal34
Qal34
Qal26
Qal26
Qal34
Qal23
Qal23
Qal23
Qal33Qal36Qal37
Qal36Qal37 Qal33
0 5
10 15
20 (FT)
22885 Savi Ranch ParkwaySuite EYorba Linda, CA 92887Phone: (714) 685-1115Fax: (714) 685-1118www.socalgeo.comPLATEB-1 TRENCH T-1PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGRIALTO, CALIFORNIASCALE: 1" = 5'SCG PROJECT20G234-2DRAWN: DRKCHKD: RGT
MATCH LINE
MATCH LINE
MATCH LINE
MATCH LINE
Qal1 - Gray Brown Silty fine to medium Sand, little coarse Sand, little fine Gravel, some trace fine root fibers, loose - dampQal2 - Light Gray fine Sand, trace to little medium to coarse Sand, little Iron oxide staining, loose - dry to dampQal3 - Light Gray Silty fine Sand, trace fine root fibers, porous, loose to dampQal4 - Light Gray fine Sandy Silt, porous, loose - dampQal5 - Light Gray Brown fine Sand, trace medium to coarse Sand, trace fine Gravel, loose - dryQal6 - Brown Silty fine Sand, pourous, loose - dampQal7 - Gray Brown fine to coarse Sand, trace to little Iron oxide staining, loose - dryQal8 - Gray to Gray Brown fine Sandy Silt, trace to little calcarous veins, porous, loose - dampQal9 - Light Gray Brown Silty fine to coarse Sand, trace fine to coarse Gravel, occasional Cobbles, loose - dry to dampQal10 - Brown Silty fine Sand, loose - dampQal11 - Gray fine Sandy Silt, little calcarous veins, porous, loose - dry to dampQal12 - Gray fine to coarse Sand, some fine to coarse Gravel, occasional Cobbles, loose - dryQal13 - Gray Brown fine to coarse Sand, trace fine Gravel, loose - dryQal14 - Gray Brown fine Sand, little Iron oxide staining, loose - dryQal15 - Light Gray Gravelly fine to coarse Sand, occasional Cobbles, loose to medium dense - dry to dampQal16 - Light Gray fine Sandy Silt, porous, medium dense - dryQal17 - Gray fine to coarse Sand, little fine to coarse Gravel, loose - dryQal18 - Brown to Gray Brown Silty fine Sand, loose to medium dense - dampQal19 - Brown Silty fine to coarse Sand, trace fine to coarse Gravel, loose - dampQal20 - Brown Silty fine Sand, loose - damp Qal21 - Light Gray fine to coarse Sand, little fine to coarse Gravel, loose to medium dense - dryQal22 - Light Gray fine Sand, trace to medium to coarse Sand, trace fine Gravel, little Iron oxide staining, loose to medium dense - dampQal23 - Brown Silty fine Sand, loose - dampQal24 - Light Gray Brown fine to coarse Sand, little fine to coarse gravel, medium dense - dampQal25 - Brown Silty fine Sand, medium dense - dampQal26 - Gray Gravely fine to coarse Sand, occasional to extensive Cobbles, medium dense - dampQal27 - Gray fine to medium Sand, trace coarse Sand, trace fine Gravel, medium dense - dryQal28 - Gray Gravelly fine to coarse Sand, occasional Cobbles, medium dense - dryQal29 - Light Gray fine to coarse Sand, trace fine to coarse Gravel, medium dense - dryQal30 - Brown Silty fine Sand, medium dense - dampQal31 - Gray fine to coarse Sand, medium dense - dryQal32 - Light Gray Gravelly fine to coarse Sand, extensive Cobbles, medium dense - dryQal33 - Gray fine Sand, medium dense - dryQal34 - Gray Gravelly fine to coarse Sand, extensive Cobbles, medium dense - dryQal35 - Gray fine Sand, trace medium to coarse Sand, trace fine Gravel, medium dense - dryQal36 - Light Gray fine Sand, trace medium Sand, little Silt, little Iron oxide Staining, loose - dampQal37 - Light Gray fine Sand, trace Silt, little Iron oxide staining, loose - dry 0+0
0+05
0+10
0+15
0+20
0+25
0+30
0+35
0+40
0+45
0+50
0+55
0+60
0+65
0+70
0+75
0+80
0+85
0+90
0+95
1+00
1+05
1+10
1+15
1+20
1+25
1+30
1+35
1+40
1+45
1+50
1+55 AfAfAfAfAf QaI1QaI1QaI1QaI1
(FT)0
5 10
15 20
QaI3
QaI5QaI5QaI5 QaI6QaI9
QaI24
QaI15
QaI33 QaI38QaI39
QaI10QaI1Obstruction
QaI10QaI7
QaI24QaI33QaI37QaI34QaI40QaI38QaI39ObstructionQaI39
QaI19QaI15QaI6QaI7
Obstruction
QaI15QaI19
QaI5QaI10
QaI24
QaI34QaI38QaI37 QaI33
QaI7QaI6
QaI20
ObstructionObstruction
QaI34QaI33
Af
QaI23QaI33QaI20QaI24QaI37QaI38
QaI15QaI10
QaI34QaI39 QaI37QaI23
QaI7QaI6 QaI7QaI7 QaI6Obstruction
Obstruction
QaI23QaI20
QaI20QaI15QaI10 Obstruction Obstruction
QaI34
BENCH
BENCH
BENCH
QaI37 QaI40
1+65
1+70
1+75
1+80
1+85
1+90
1+95
2+00
2+05
2+10
2+15
2+20
2+25
2+30
2+35
2+40
2+45
2+50
2+55
0+0
2+60
2+70
2+75
2+80
2+90
2+95
3+00
3+05
3+10
3+15
3+20
2+85
AfAfAfAf QaI1QaI2QaI2QaI2QaI4 QaI4 QaI4 QaI4 QaI4 QaI4QaI5QaI5QaI5QaI5 QaI5QaI5QaI5 QaI5
QaI38
ObstructionObstructionObstruction
Obstruction
Tree Bark
QaI6 QaI10QaI15 QaI16
QaI24 QaI8
Tree RootThick Tree Root
QaI5 QaI5
QaI23
QaI20QaI23QaI24QaI21
QaI10
Obstruction
QaI10QaI10QaI10 QaI15QaI20
QaI37QaI38 QaI33 QaI37QaI33QaI24
Obstruction
Obstruction QaI21QaI22QaI24QaI24QaI34QaI34
QaI22 QaI21QaI21
QaI21QaI20QaI15
Obstruction
Tree Bark
QaI34QaI34 QaI34QaI33QaI38
QaI24QaI24 Obstruction
Tree Root
QaI24QaI24
Obstruction ObstructionObstruction
Obstruction
Tree Root
Obstruction
QaI10QaI15QaI19ObstructionObstruction QaI24QaI32 QaI32QaI17 Obstruction Obstruction
QaI37 QaI33QaI37QaI42 QaI42QaI41
QaI8
QaIQaIObstruction QaI19
3+20
3+25
3+30
0+0
3+40
3+45
3+50
3+55
3+60
3+65
3+70
3+75
3+80
3+85
3+90
3+95
4+00
4+05
4+10
4+15
4+20
4+25
4+30
4+35
4+40
4+50
4+55
4+60
4+65
4+70
4+75
4+80
4+45 AfAfAfAf QaI3QaI3QaI3QaI3 QaI5QaI5QaI5
QaI19QaI33 QaI41QaI37
QaI5QaI17
QaI10 QaI5
ObstructionObstruction
ObstructionQaI24
Obstruction
QaI41QaI37
QaI32QaI27QaI19QaI17QaI15QaI10
Obstruction QaI41QaI42
Obstruction ObstructionObstructionObstruction
QaI10
QaI19 QaI24QaI24
QaI32QaI37QaI41
QaI17 QaI27
QaI15QaI10 ObstructionObstruction
QaI30QaI27QaI27QaI17QaI15
ObstructionObstruction
ObstructionObstruction
Obstruction
QaI10QaI10
QaI32QaI41
QaI23 QaI23
ObstructionPCC PIPIE
QaI29
QaI QaI29
Tree Roots
QaI14
QaI30QaI26QaI26QaI23QaI18
QaI8QaI8
QaI17 QaI17QaI15QaI14QaI8
QaI29QaIQaI42
QaI41
Obstruction
22885 Savi Ranch ParkwaySuite EYorba Linda, CA 92887Phone: (714) 685-1115Fax: (714) 685-1118www.socalgeo.comPLATEB-2a TRENCH T-2PROPOSED COMMERCAIL/INDUSTRIAL BUILDINGRIALTO, CALIFORNIASCALE: 1" = 5'SCG PROJECT20G234-2DRAWN: DRKCHKD: RGT
MATCH LINE
MATCH LINE
MATCH LINE
MATCH LINE
Af - Gray Brown to Brown fine Sand to Silty fine Sand, trace medium to coarse Sand, mottled, roots,debris loose - dampQal1 - Brown Silty fine Sand, trace medium to coarse Sand, loose - dry to dampQal2 - Light Gray Gravelly fine to coarse Sand, occasional to extensive Cobbles, loose - dryQal3 - Gray Silty fine to coarse Sand, trace to little fine to coarse Gravel, loose - dryQal4 - Light Gray fine Sand, trace medium to coarse Sand, trace fine to coarse Gravel, loose - dryQal5 - Dark Gray Brown Silty fine Sand, loose - dry to dampQal6 - Gray Brown fine Sand, trace to little medium to coarse Sand, little Iron oxide staining, loose - dryQal7 - Light Gray fine to coarse Sand, loose - dryQal8 - Light Gray fine to medium Sand, little coarse Sand, trace fine to coarse Gravel, occasional Cobbles, loose - dryQal9 - Gray fine to coarse Sand, little fine to coarse Gravel, occasional Cobbles, loose - dryQal10 - Gray Brown fine to medium Sand, trace coarse Sand, little Silt, loose - dry to dampQal11 - Light Gray fine Sand, little medium to coarse Sand, trace fine to coarse Gravel, loose - dryQal12 - Gray fine Sandy Silt, trace calcareous veining, loose to medium dense - dampQal13 - Gray Brown Silty fine Sand, loose to medium dense - dampQal14 - Light Gray fine Sand, little Iron oxide staining, loose - dryQal15 - Gray Brown Silty fine Sand, little Iron oxide staining, trace Calcareous nodules, loose - dryQal16 - Light Gray Gravelly fine to coarse Sand, loose - dryQal17 - Light Gray Brown fine Sand, trace medium to coarse Sand, little Iron oxide staining, loose - dryQal18 - Light Gray Brown Silty fine Sand, trace medium to coarse Sand, trace fine Gravel, medium dense - dampQal19 - Light Gray Brown fine to medium Sand, trace coarse Sand, little Iron oxide staining, loose - dampQal20 - Light Gray fine Sand, extensive Iron oxide staining, loose - dry to damp Qal21 - Gray fine to coarse Sand, little fine to coarse Gravel, medium dense - dryQal22 - Gray fine Sand, little Iron oxide staining, medium dense - dryQal23 - Brown Silty fine Sand, loose to medium dense - dampQal24 - Gray fine to coarse Sand, little fine to coarse Gravel, medium dense - dampQal25 - Light Gray fine Sand, laminated, Iron oxide staining, loose - dryQal26 - Gray Brown Silty fine to coarse Sand, little fine to coarse Gravel,occasional Cobbles, loose - dry to dampQal27 - Light Gray fine Sand, little Iron oxide staining, loose - dry to dampQal28 - Gray Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal29 - Light Gray Brown Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal30 - Light Gray Brown fine Sandy Silt, slightly porous, trace organics, medium dense - dryQal31 - Light Gray fine to medium Sand, little coarse Sand, little fine to coarse Gravel, loose - dryQal32 - Gray Brown Silty fine to coarse Sand, little Iron oxide staining, loose - dryQal33 - Light Brown fine Sand, trace to little medium to coarse Sand, little Silt,little Iron oxide Staining, loose - dampQal34 - Light Gray Brown Silty fine Sand, little Iron oxide Staining. loose - dampQal35 - Light Gray fine to medium Sand, trace coarse Sand, loose - dryQal36 - Light Gray Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal37 - Light Gray fine to coarse Sand, little Iron oxide staining, loose - dryQal38 - Light Gray Brown Silty fine Sand, little Iron oxide staining, loose - dampQal39 - Light Gray fine to medium Sand, trace coarse Sand, little Iron oxide staining, loose - dampQal40 - Light Gray Brown Silty fine Sand, little Iron oxide staining, loose - damp to moist Qal41 - Gray Brown Silty fine to coarse Sand, trace fine to coarse Gravel, loose - dryQal42 - Gray Brown Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal43 - Light Gray fine to coarse Sand, trace fine Gravel, loose - dryQal44 - Light Gray Brown fine Sand, trace medium Sand, little Silt, little Iron oxidestaining, loose- dampQal45 - Light Gray Brown Silty fine Sand, trace medium Sand, little Iron oxide stainingmedium dense - dryQal46 - Light Gray Gravelly fine to coarse Sand, occasional Cobbles, trace Iron oxidestaining, loose - dryQal47 - Light Gray fine Sand, little Iron oxide staining, loose - dryQal48 - Light Gray Brown fine Sand, trace Silt, little Iron oxide staining, loose - damp MATCH LINE PLATE B-2b
4+85
4+90
4+95
5+00
5+05
5+10
5+15
5+20
5+25
5+30
5+35
5+40
5+45
5+50
5+55
5+60
5+65
5+70
5+75
5+80
5+85
5+90
5+95
6+00
6+05
6+10
6+15
6+20
6+25
6+30
6+35
6+40 AfAfAfAf QaI3QaI3QaI3QaI3QaI5QaI5 QaI5 QaI510
QaI24QaI29QaI29QaI29QaI29
QaI32
QaI15
QaI8
QaI23QaI30
QaI18
QaI45
QaI23QaI24
Obstruction
Obstruction
Obstruction
QaI23 QaI23
QaI24QaI18
QaI8QaI8QaI5
QaI15
ObstructionObstructionObstructionQaI8QaI8QaI11
QaI45 QaI46
ObstructionQaI11 QaI14
QaI24
QaI18QaI15 QaI11QaI8 QaI8QaI5ObstructionQaI5
QaI24QaI45QaI37
QaI37
QaI8QaI8QaI8QaI8 QaI11 Obstruction
Obstruction
QaI24QaI31
QaI15QaI18
QaI45 Obstruction
QaI24QaIQaI18
Metal
6+40
6+45
6+50
6+55
6+60
6+65
6+70
6+75
6+80
6+85
6+90
6+95
7+00
7+05
7+10
7+15
7+20
7+25
7+30
7+35
7+40
7+45
7+50
7+55
7+60
7+65
7+70
7+80
7+85
7+90
7+95
8+00
7+75 AfAfAfAf QaI3QaI3QaI3QaI3QaI3
QaI5
QaI5QaI5QaI5
QaI45QaI24
QaI25
QaI46
ObstructionQaI15ObstructionQaI5QaI8QaI11QaI13
QaI13QaI8
QaI22QaI23
QaI8QaI8 QaI11
QaI25QaI45
QaI15 QaI22
QaI22
Obstruction
QaI13QaI12
QaI23QaI28Obstruction
Obstruction
QaI28QaI23 QaI29
QaI29 QaI36QaI28QaI22QaI15
ObstructionQaI13
QaI13QaI12ObstructionQaI8QaI8QaI8 Obstruction
ObstructionQaI25QaI25
QaI15
QaI12QaI13Obstruction
QaI23QaI23
ObstructionQaI35QaI36QaI29 QaI25QaI25QaI35QaI25 QaI22QaI22 QaI13Obstruction
Obstruction
QaI13
QaI44QaI47Obstruction
Obstruction
Obstruction QaI44QaI47 QaI43
QaI25
QaI11
QaI11QaI12QaI13
QaI44
QaI23QaI29QaI29 QaI29
QaI45
Metal
Obstruction
8+00
8+05
8+10
8+15
8+20
8+25
8+30
8+35
8+40
8+45
8+50
8+55
8+60
8+65
8+70
8+75
8+80
8+85
8+90
8+95 AfAfAf QaI3QaI3QaI3
Obstruction
13QaI15
QaI4344QaI44
QaI8QaI8
QaI8 ObstructionObstructionObstructionQaI12QaI13
ObstructionObstruction
QaI15
QaI11QaI12 QaI13
QaI23QaI25QaI22
QaI22QaI23QaI25 ObstructionQaI43
9+00
9+05
9+10
9+15
9+20
9+25
9+30
9+35
9+40
9+45
9+500
5 10
15 20
QaI3QaI3QaI3QaI3
QaI22
QaI15QaI15 QaI13
ObstructionObstructionObstruction
QaI25 Obstruction
ObstructionObstruction QaI25
QaI25QaI25 QaI43
QaI43ObstructionObstruction
QaI43QaI43 QaI44 QaI44QaI44QaI44QaI44 QaI47QaI47QaI47QaI47 22885 Savi Ranch ParkwaySuite EYorba Linda, CA 92887Phone: (714) 685-1115Fax: (714) 685-1118www.socalgeo.comPLATEB-2b TRENCH T-2PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGRIALTO, CALIFORNIASCALE: 1" = 5'SCG PROJECT20G234-2DRAWN: DRKCHKD: RGT
MATCH LINE
MATCH LINE
MATCH LINE
MATCH LINEMATCH LINE PLATE 2a
Af - Gray Brown to Brown fine Sand to Silty fine Sand, trace medium to coarse Sand, mottled, roots,debris loose - dampQal1 - Brown Silty fine Sand, trace medium to coarse Sand, loose - dry to dampQal2 - Light Gray Gravelly fine to coarse Sand, occasional to extensive Cobbles, loose - dryQal3 - Gray Silty fine to coarse Sand, trace to little fine to coarse Gravel, loose - dryQal4 - Light Gray fine Sand, trace medium to coarse Sand, trace fine to coarse Gravel, loose - dryQal5 - Dark Gray Brown Silty fine Sand, loose - dry to dampQal6 - Gray Brown fine Sand, trace to little medium to coarse Sand, little Iron oxide staining, loose - dryQal7 - Light Gray fine to coarse Sand, loose - dryQal8 - Light Gray fine to medium Sand, little coarse Sand, trace fine to coarse Gravel, occasional Cobbles, loose - dryQal9 - Gray fine to coarse Sand, little fine to coarse Gravel, occasional Cobbles, loose - dryQal10 - Gray Brown fine to medium Sand, trace coarse Sand, little Silt, loose - dry to dampQal11 - Light Gray fine Sand, little medium to coarse Sand, trace fine to coarse Gravel, loose - dryQal12 - Gray fine Sandy Silt, trace calcareous veining, loose to medium dense - dampQal13 - Gray Brown Silty fine Sand, loose to medium dense - dampQal14 - Light Gray fine Sand, little Iron oxide staining, loose - dryQal15 - Gray Brown Silty fine Sand, little Iron oxide staining, trace Calcareous nodules, loose - dryQal16 - Light Gray Gravelly fine to coarse Sand, loose - dryQal17 - Light Gray Brown fine Sand, trace medium to coarse Sand, little Iron oxide staining, loose - dryQal18 - Light Gray Brown Silty fine Sand, trace medium to coarse Sand, trace fine Gravel, medium dense - dampQal19 - Light Gray Brown fine to medium Sand, trace coarse Sand, little Iron oxide staining, loose - dampQal20 - Light Gray fine Sand, extensive Iron oxide staining, loose - dry to damp Qal21 - Gray fine to coarse Sand, little fine to coarse Gravel, medium dense - dryQal22 - Gray fine Sand, little Iron oxide staining, medium dense - dryQal23 - Brown Silty fine Sand, loose to medium dense - dampQal24 - Gray fine to coarse Sand, little fine to coarse Gravel, medium dense - dampQal25 - Light Gray fine Sand, laminated, Iron oxide staining, loose - dryQal26 - Gray Brown Silty fine to coarse Sand, little fine to coarse Gravel,occasional Cobbles, loose - dry to dampQal27 - Light Gray fine Sand, little Iron oxide staining, loose - dry to dampQal28 - Gray Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal29 - Light Gray Brown Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal30 - Light Gray Brown fine Sandy Silt, slightly porous, trace organics, medium dense - dryQal31 - Light Gray fine to medium Sand, little coarse Sand, little fine to coarse Gravel, loose - dryQal32 - Gray Brown Silty fine to coarse Sand, little Iron oxide staining, loose - dryQal33 - Light Brown fine Sand, trace to little medium to coarse Sand, little Silt,little Iron oxide Staining, loose - dampQal34 - Light Gray Brown Silty fine Sand, little Iron oxide Staining. loose - dampQal35 - Light Gray fine to medium Sand, trace coarse Sand, loose - dryQal36 - Light Gray Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal37 - Light Gray fine to coarse Sand, little Iron oxide staining, loose - dryQal38 - Light Gray Brown Silty fine Sand, little Iron oxide staining, loose - dampQal39 - Light Gray fine to medium Sand, trace coarse Sand, little Iron oxide staining, loose - dampQal40 - Light Gray Brown Silty fine Sand, little Iron oxide staining, loose - damp to moist Qal41 - Gray Brown Silty fine to coarse Sand, trace fine to coarse Gravel, loose - dryQal42 - Gray Brown Gravelly fine to coarse Sand, extensive Cobbles, loose - dryQal43 - Light Gray fine to coarse Sand, trace fine Gravel, loose - dryQal44 - Light Gray Brown fine Sand, trace medium Sand, little Silt, little Iron oxidestaining, loose- dampQal45 - Light Gray Brown Silty fine Sand, trace medium Sand, little Iron oxide stainingmedium dense - dryQal46 - Light Gray Gravelly fine to coarse Sand, occasional Cobbles, trace Iron oxidestaining, loose - dryQal47 - Light Gray fine Sand, little Iron oxide staining, loose - dryQal48 - Light Gray Brown fine Sand, trace Silt, little Iron oxide staining, loose - damp
SITE
LINEAR FEATURE (POSSIBLE FAULT SCARP)
RIALTO, CALIFORNIAHISTORICAL PHOTOGRAPH - 1938PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGDRAWN: DRKCHKD: RGT1" = 1500' PLATE C-1SCG PROJECT20G234-2
SITE
LINEAR FEATURE (POSSIBLE FAULT SCARP)
RIALTO, CALIFORNIAHISTORICAL PHOTOGRAPH - 1969PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGDRAWN: DRKCHKD: RGT1" = 1500' PLATE C-2SCG PROJECT20G234-2
SITE
LINEAR FEATURE (POSSIBLE FAULT SCARP)
RIALTO, CALIFORNIAHISTORICAL PHOTOGRAPH - 1978PROPOSED COMMERCIAL/INDUSTRIAL BUILDINGDRAWN: DRKCHKD: RGT1" = 1500' PLATE C-3SCG PROJECT20G234-2
TRENCH T-2TRENCH T-1
5 2
310
8 123
7 19
11219
61613 26
2217
121815
14 244
2025
29 35
33/34
32 31
37 48/493630
42 38
40/41
39 27
28 47
46 45
4443
5051
52 53
54/56
55/57
58 59
61/62
6364
60 69/70
68 67
66 65
71 72
73 74
7579
8081
828378
7677
SCALE: 1" = 100'DRAWN: DRKCHKD: RGTPLATE 7SCG PROJECT20G234-2
RIALTO, CALIFORNIAPROPOSED COMMERCIAL/INDUSTRIAL BUILDINGDENSITY TEST LOCATION PLAN NORTHSoCalGeo
GEOTECHNICAL LEGENDAPPROXIMATE LOCATION OF
NOTE: SITE PLAN PREPARED BY ARCHITECTS ORANGE
IN-PLACE DENSITY TESTAPPROXIMATE TRENCH LOCATION
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No. Date Depth Test Soil Moisture Dry Density Relative Comments (ft) Location Type Content (pcf) Compaction
(%) (%)
1 21-Jan-21 -18.0 Trench No. T-1 A 10.1 111.2 90
2 21-Jan-21 -18.0 Trench No. T-1 A 10.6 111.7 90
3 21-Jan-21 -18.0 Trench No. T-1 A 10.7 111.8 91
4 21-Jan-21 -16.0 Trench No. T-1 A 10.5 111.5 90
5 21-Jan-21 -16.0 Trench No. T-1 A 10.2 111.4 90
6 21-Jan-21 -16.0 Trench No. T-1 A 10.9 111.9 91
7 22-Jan-21 -14.0 Trench No. T-1 A 10.2 111.4 90
8 22-Jan-21 -14.0 Trench No. T-1 A 10.1 111.2 90
9 22-Jan-21 -14.0 Trench No. T-1 A 10.3 111.3 90
10 22-Jan-21 -12.0 Trench No. T-1 A 10.1 111.2 90
11 22-Jan-21 -12.0 Trench No. T-1 A 10.4 111.4 90
12 22-Jan-21 -12.0 Trench No. T-1 A 10.2 111.3 90
13 22-Jan-21 -10.0 Trench No. T-1 A 10.5 111.5 90
14 22-Jan-21 -10.0 Trench No. T-1 A 10.4 111.5 90
15 26-Jan-21 -8.0 Trench No. T-1 A 11.4 112.1 91
16 26-Jan-21 -8.0 Trench No. T-1 A 11.6 112.0 91
17 26-Jan-21 -8.0 Trench No. T-1 A 12.1 112.4 91
18 26-Jan-21 -8.0 Trench No. T-1 A 11.9 111.9 91
19 26-Jan-21 -6.0 Trench No. T-1 A 12.4 111.5 90
20 26-Jan-21 -6.0 Trench No. T-1 A 12.1 111.0 90
21 26-Jan-21 -4.0 Trench No. T-1 A 11.8 111.3 90
22 26-Jan-21 -4.0 Trench No. T-1 A 12.0 112.0 91
23 26-Jan-21 -2.0 Trench No. T-1 A 11.8 111.1 90
24 26-Jan-21 -2.0 Trench No. T-1 A 12.1 111.4 90
25 26-Jan-21 -2.0 Trench No. T-1 A 12.0 111.4 90
26 27-Jan-21 -1.0 Trench No. T-1 A 11.8 111.5 90
27 27-Jan-21 -1.0 Trench No. T-1 A 11.5 111.3 90
28 27-Jan-21 -1.0 Trench No. T-1 A 11.7 111.0 90
29 15-Feb-21 -18.0 Trench No. T-2 B 12.5 111.5 91
30 15-Feb-21 -18.0 Trench No. T-2 B 12.0 112.0 91
31 15-Feb-21 -18.0 Trench No. T-2 B 12.4 112.3 91
32 15-Feb-21 -18.0 Trench No. T-2 B 12.1 111.9 91
33 15-Feb-21 -18.0 Trench No. T-2 B 10.0 110.0 89 Fail
34 15-Feb-21 -18.0 Trench No. T-2 B 10.7 111.5 91 Retest No. 33 35 15-Feb-21 -18.0 Trench No. T-2 B 10.9 111.8 91
36 15-Feb-21 -16.0 Trench No. T-2 B 10.9 111.9 91
37 15-Feb-21 -16.0 Trench No. T-2 B 11.2 112.1 91
38 15-Feb-21 -16.0 Trench No. T-2 B 11.5 112.0 91
20G234-2 Proposed Commercial/Industrial Building - Rialto, California Page 1 TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No. Date Depth Test Soil Moisture Dry Density Relative Comments (ft) Location Type Content (pcf) Compaction
(%) (%)
39 15-Feb-21 -16.0 Trench No. T-2 B 11.3 112.1 91
40 15-Feb-21 -16.0 Trench No. T-2 B 9.5 109.4 89 Fail
41 15-Feb-21 -16.0 Trench No. T-2 B 10.6 111.6 91 Retest No. 40 42 15-Feb-21 -16.0 Trench No. T-2 B 11.0 111.8 91
43 15-Feb-21 -14.0 Trench No. T-2 B 11.8 111.9 91
44 15-Feb-21 -14.0 Trench No. T-2 B 11.4 112.1 91
45 15-Feb-21 -14.0 Trench No. T-2 B 11.9 112.3 91
46 15-Feb-21 -14.0 Trench No. T-2 B 10.9 112.0 91
47 15-Feb-21 -14.0 Trench No. T-2 B 11.3 112.1 91
48 15-Feb-21 -14.0 Trench No. T-2 B 9.6 109.6 89 Fail
49 15-Feb-21 -14.0 Trench No. T-2 B 10.8 112.0 91 Retest No. 48 50 15-Feb-21 -14.0 Trench No. T-2 B 11.0 111.8 91
51 16-Feb-21 -12.0 Trench No. T-2 B 12.0 112.2 91
52 16-Feb-21 -12.0 Trench No. T-2 B 12.2 112.1 91
53 16-Feb-21 -12.0 Trench No. T-2 B 11.9 111.8 91
54 16-Feb-21 -12.0 Trench No. T-2 B 10.0 109.4 89 Fail
55 16-Feb-21 -12.0 Trench No. T-2 B 10.2 109.9 89 Fail
56 16-Feb-21 -12.0 Trench No. T-2 B 12.3 110.9 90 Retest No. 54 57 16-Feb-21 -12.0 Trench No. T-2 B 12.1 111.0 90 Retest No. 55 58 16-Feb-21 -10.0 Trench No. T-2 B 11.8 111.2 90
59 16-Feb-21 -10.0 Trench No. T-2 B 11.7 111.5 91
60 16-Feb-21 -10.0 Trench No. T-2 B 12.2 111.4 91
61 16-Feb-21 -10.0 Trench No. T-2 B 10.4 109.4 89 Fail
62 16-Feb-21 -10.0 Trench No. T-2 B 11.5 111.9 91 Restest No. 61 63 16-Feb-21 -10.0 Trench No. T-2 B 11.8 111.7 91
64 16-Feb-21 -10.0 Trench No. T-2 B 11.0 111.5 91
65 17-Feb-21 -8.0 Trench No. T-2 B 10.6 110.9 90
66 17-Feb-21 -8.0 Trench No. T-2 B 10.8 111.0 90
67 17-Feb-21 -8.0 Trench No. T-2 B 10.9 111.2 90
68 17-Feb-21 -8.0 Trench No. T-2 B 11.2 110.8 90
69 17-Feb-21 -8.0 Trench No. T-2 B 10.4 108.3 88 Fail
70 17-Feb-21 -8.0 Trench No. T-2 B 10.9 111.3 90 Retest No. 69 71 17-Feb-21 -6.0 Trench No. T-2 B 11.0 111.3 90
72 17-Feb-21 -6.0 Trench No. T-2 B 11.2 111.0 90
73 17-Feb-21 -6.0 Trench No. T-2 B 10.8 111.2 90
74 17-Feb-21 -6.0 Trench No. T-2 B 10.6 111.1 90
75 17-Feb-21 -6.0 Trench No. T-2 B 11.2 110.9 90
76 17-Feb-21 -4.0 Trench No. T-2 B 10.9 110.9 90
20G234-2 Proposed Commercial/Industrial Building - Rialto, California Page 2 TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No. Date Depth Test Soil Moisture Dry Density Relative Comments (ft) Location Type Content (pcf) Compaction
(%) (%)
77 17-Feb-21 -4.0 Trench No. T-2 B 11.0 111.2 90
78 18-Feb-21 -2.0 Trench No. T-2 B 11.8 110.9 90
79 18-Feb-21 -2.0 Trench No. T-2 B 11.9 111.1 90
80 18-Feb-21 -4.0 Trench No. T-2 B 11.5 111.0 90
81 18-Feb-21 -4.0 Trench No. T-2 B 11.8 111.3 90
82 18-Feb-21 -4.0 Trench No. T-2 B 11.0 108.2 88
83 18-Feb-21 -4.0 Trench No. T-2 B 12.0 111.2 90
NOTES: Elevations Referenced To Grade Stakes Set In Field By Others Retests Performed After Recompaction
All Tests Performed By Nuclear Test Method (ASTM D-6938) 20G234-2 Proposed Commercial/Industrial Building - Rialto, California Page 3 TABLE 2
SUMMARY OF MOISTURE-DENSITY RELATIONSHIPS
Soil Type Soil Description Maximum Dry
Density (pcf)
Optimum
Moisture (%)
A Gray Brown Silty fine Sand, trace medium Sand 123.5 9.5 B Gray Brown Silty fine to coarse Sand, little fine to coarse Gravel 123.0 10.5 Note: All Moisture-Density Relationships determined per ASTM D-1557 (Modified Proctor) 20G234-2 Proposed Commercial/Industrial Building -- Rialto, California Page 4