Exhibit B-1 Hercules Skelly Residential Project Final ISMND_ISMND_Appendices COMBINED — Hercules City Council, September 27, 2022 (part 3 of 6)

Primary No. Trinomial
Resource List
Other IDs Type Age Attribute codes Recorded by Reports
21183RS
P-07-001004 Resource Name - Hercules
Village;
OHP Property Number - 010219;
OHP PRN - St. Fnd. Prg. 619.0-
84-HP-07-003;
OHP PRN - Tax. Cert. 537.9-07-
0004;
OHP PRN - NPS-8000799-9999;
OHP PRN - 4547-0001-9999
Building,
District
Historic HP02; HP03; HP05;
HP13; HP14
([none], [none])
P-07-001073 Resource Name - Bernardo
Fernandez House;
Other - 100 Tennent Ave;
OHP Property Number - 010556;
OHP PRN - NPS-73000399-0000;
OHP PRN - 4564-0001-0000;
PHI - SPHI-CCO-006;
Other - Fernandez Mansion
S-001737, S007572, S-009937,
S-052313, S-053807
Building Historic HP02 1972 (George Vincent, Pinole
Historical Commission);
1972 (E. A. Linscheid, County Board
of Supervisors);
1975 (Charles A. Farren, Contra
Costa Planning Dept.)
P-07-001075 Resource Name - Downer House;
OHP Property Number - 010558;
OHP PRN - DOE-01-88-0030-
0000;
OHP PRN - HUD87119D;
Other - 2711 San Pablo Ave;
OHP PRN - 4564-0003-0000
Building Historic HP02 1975 (Charles A. Farren, Contra S-052313 Costa Planning Dept.)
P-07-001076 Resource Name - Pinole
Waterfront;
OHP Property Number - 010559;
OHP PRN - 4564-0004-0000;
Other - Tennent Ave
Building Historic AH13 1995 (Charles A. Farren, Contra S-039185, S-052313 Costa Planning Dept.)
P-07-001840 Resource Name - Bank of Pinole;
Other - 2361 San Pablo Ave;
OHP Property Number - 102032;
OHP PRN - NPS-96001175-0000
Building Historic HP06 1996 (Robert William Petterson,
[none])
P-07-004528 Resource Name - HER14 Structure Historic AH07 2012 (Rebecca Kellawan, Kaely S-040338 Romney, Julia Costello, Far
Western; Foothill Resources)
P-07-004531 Resource Name - HER34 Structure Historic AH16 2012 (Rebecca Kellawan, Kaely S-040338 Romney, Julia Costello, Far
Western; Foothill Resources)

Page 2 of 2 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-000687 1977 An archaeological field reconnaissance of a 12 acre site in the City of Hercules (letter
report)
Holman & Chavez,
Consulting Archaeologists
David Chavez
S-000795 1977 Archaeological Reconnaissance - Pinole,
California (letter report)
Del Davis Del Davis Associates, Inc.

S-000880 1978 An Archaeological Field Reconnaissance of properties in the City of Hercules (letter report)
David Chavez
S-001128 1978 Field reconnaissance of the proposed
development of Hercules neighborhood #6, in
Hercules, California (letter report)
Miley Paul Holman Holman & Associates 07-000443
S-001128a 1978 Reconnaissance of Neighborhood #6,
Hercules, California; and results of records
search at Sonoma State College (letter report)
Miley Paul Holman Holman & Associates
S-001198 1977 An Archaeological Reconnaissance of the
Proposed Pipeline Routes Between the
Pinole and Rodeo Wastewater Treatment
Plants, Contra Costa County, California.

The Anthropology
Laboratory, Sonoma State
College
Steven E. Stoddard
S-001737 1979 A Cultural Resources Survey of Pinole Creek, Contra Costa County, California
U.S. Army Corps of
Engineers
Mark Rudo and Nadine
Mandel
07-000451, 07-001073
S-002629 1980 Archaeological field reconnaissance of the proposed D&S development area in
Hercules, California (letter report)
Miley Paul Holman Holman & Associates
S-002686 1981 Draft Environmental Impact Report for Pinole Redevelopment Area Boundary Expansion
and Annexation
Benjamin F.H. Ananian Ecumene Associates 07-000041, 07-000139, 07-000140, 07-000141, 07-000142, 07-000222
S-002753 Submitter - ARS 81- 1981 Del Davis Historical Review, Brandt-Buckley Properties. Del Davis Associates, Inc. 56;
Voided - S-2685
S-002753a 1981 Archaeological reconnaissance of a 5 acre parcel, Project N-9 80150, Pinole, Contra
Costa County, California (letter report)
Archaeological Resource
Service
Terry L. Hunt
S-007093 1984 Archaeological Reconnaissance of Proposed Hercules School Site (letter report)
Miley Paul Holman Holman & Associates
S-009937 1988 Archaeological Study of the Railroad Avenue Storm Drain Improvements Project, Pinole,
Contra Costa County, California (PN 17107 E
52)
U.S. Army Corps of
Engineers
Leigh Jordan 07-001073

Page 1 of 6 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-012895 1991 Archaeological Reconnaissance of 5.45
Acres Near the Intersection of Samuel and
John Streets, City of Pinole, Contra Costa
County, California
Archaeological/Historical
Consultants
Michael Smith and
Suzanne Baker
S-013961 1992 An Archaeological Survey of the Richmond to Concord Pipeline Project, L.S. 80
Archaeological Study
Center, Department of
Anthropology, California
State University,
Sacramento
Kenneth J. McIvers
S-015813 1993 Archival Research and Field Inspection of the Proposed Wilson Point to Lone Tree Point
Trail Route, Contra Costa County, California
(letter report)
Miley Paul Holman Holman & Associates 07-000141, 07-000142 S-019550 1997 Cultural Resources Assessment, Proposed
Change to Wickland LLC, Richmond MarineLink Pipeline Alignment Steve Conklin and LSA Associates, Inc.

Deborah McLean
S-022716 2000 Archaeological Survey and Assessment of
760 Alvarez, Pinole, CA (letter report)
William Self William Self Associates, Inc.

S-022817 2000 Cultural Resources Survey for the Level (3) Communications Long Haul Fiber Optics
Project, Segment WS01: Sacramento to
Oakland
Far Western
Anthropological Research
Group, Inc.; Foothill
Resources, Ltd.

Wendy J. Nelson,
Maureen Carpenter, and
Julia G. Costello
01-000084, 01-000120, 07-000137,
07-000138, 07-000149, 07-000184,
48-000072, 48-000081, 48-000211,
48-000441, 48-000549, 57-000198
Submitter - Project
Number 27101
S-022962 2000 Mechanical Subsurface Testing at the
Recorded Location of CCO-370, Bixby
Property, Hercules, Contra Costa County,
California
Miley Paul Holman Holman & Associates 07-000443
S-023548 1995 Archival Literature Search and On-Site
Archaeological Surface Reconnaissance of
an Approximately 5 Acre Parcel, Located
Near the Intersection of Pinon Avenue and
Primrose Lane, in Pinole, Contra Costa
County
Allen G. Pastron Archeo-Tec
S-024592 2001 Archaeological Monitoring for WS01 Long
Haul Fiber Optic Segment, Between
Sacramento and Emeryville, California
Denise Furlong and Kim Tremaine & Associates, LLC
Tremaine
01-000081, 01-000084, 01-010543,
07-000134, 07-000137, 07-000138,
07-000149, 07-002569, 07-002570,
35-000334, 43-000928, 48-000072,
48-000081, 48-000211, 48-000441,
57-000198
S-024592 a 1999 Level 3 Long Haul Fiber Optics Project, Cultural Resources Procedures
Parsons Brinckerhoff
Network Services

Page 2 of 6 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-024592aa 2000 West Side of ILA in Suisun City, MP48 WS01 (letter report)
Don Bignell Tremaine & Associates
S-024592b 1999 Level 3 Long Haul Fiber Optics Project,
Cultural Resources Management Plan for
California Routes, Research Design
Jim Railey and Howard TRC Mariah Associates, Inc.

Higgins
S-024592bb 2000 Southern Carquinez Straits Alternate Route Survey, WS01 (letter report)
Kim Tremaine Tremaine & Associates
S-024592c 2000 Results of Utility Locating & Site Boundary Delineation for CA-CCO-258, Rodeo,
California
Kim Tremaine Tremaine & Associates
S-024592cc 2000 Northern Carquinez Straits Alternate Route, WS01 (letter report)
Kim Tremaine Tremaine & Associates
S-024592d 2000 Results of Site Monitoring During Utility Locating for CA-CCO-270, San Pablo,
California
Kim Tremaine Tremaine & Associates
S-024592dd 2000 Maritime Academy Right of Way Extension, WS01 (letter report)
Don Bignell Tremaine & Associates
S-024592e 2000 Results of Site Boundary Testing at CA-ALA304, North and South of Cerrito Creek, in Albany, California
Kim Tremaine Tremaine & Associates
S-024592f 2000 Kim Tremaine Site Damage Assessment for CA-ALA-304 Tremaine & Associates S-024592g 2000 Results of Site Monitoring During Utility Locating for CA-ALA-307, in West Berkeley,
California
Kim J. Tremaine Tremaine & Associates
S-024592h 1999 Results of Minimal Testing at the Buried Shell Midden Location, MP20, in Pinole, California
Tremaine & Associates
S-024592I 1999 Results of Site Boundary Testing of the
Buried Shell Midden at MP20 in Pinole,
California
Kim J. Tremaine Tremaine & Associates
S-024592j 2000 Results of Site Monitoring During Utility Locating for Unanticipated Discovery MP20,
Pinole, California
Kim Tremaine Tremaine & Associates
S-024592k 2000 Kim Tremaine Incident Report on Frak-Outs at MP8 & MP20 Tremaine & Associates S-024592l 2000 Results of Site Boundary Testing for the School House Creek Site, in West Berkeley,
California
Kim J. Tremaine Tremaine & Associates

Page 3 of 6 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-024592m 2000 Results of Testing for the Presence of Shell Midden Between Virginia and Delaware
Streets, West Berkeley, California
Kim J. Tremaine Tremaine & Associates
S-024592n 1999 Hayward Survey, MP23.79-23.88, WS07
(letter report)
Kim Tremaine Tremaine & Associates
S-024592o 1999 Jameson Canyon Survey, MP 57, WS01
(letter report)
Kim Tremaine Tremaine & Associates
S-024592p 2000 Richmond Parkway Survey, MP15, WS01
(letter report)
Kim Tremaine Tremaine & Associates
S-024592q 2000 Holly Oak Ranch Survey, MP59, WS01 (letter report)
Kim Tremaine Tremaine & Associates
S-024592r 2000 Kim Tremaine Cordelia Survey, WS01 (letter report) Tremaine & Associates S-024592s 2000 Kim Tremaine Crockett Survey, ~MP25, WS01 (letter report) Tremaine & Associates S-024592t 2000 San Jose Survey, MP 43, WS07 Route
Extension (letter report)
Kim Tremaine Tremaine & Associates
S-024592u 2000 Kim Tremaine Fremont Survey, MP 28, WS07 (letter report) Tremaine & Associates S-024592v 2000 Jameson Canyon Survey, MP58, WS01
(letter report)
Kim Tremaine Tremaine & Associates
S-024592w 2000 Maritime Academy Survey, WS01 (letter
report)
Kim Tremaine Tremaine & Associates
S-024592x 2000 Maritime Academy TEWS, WS01 (letter
report)
Kim Tremaine Tremaine & Associates
S-024592y 2000 Results of Broadway Street and South River Road Survey (letter report)
Don Bignell Tremaine & Associates
S-024592z 2000 Carquinez Bridge South, TEWS Survey,
MP25, WS01 (letter report)
Don Bignell Tremaine & Associates
S-030154 2005 Phase I Archaeological Investigation of the San Pablo and Tennent Avenues Project
Parcel, an Approximately One-half Acre
Parcel of Land Located in Pinole, Contra
Costa County, California.

Allen G. Pastron and Archeo-Tec
Jason Claiborne
S-030580 2004 Archaeological and Paleontological
Assessments - Heritage Park, 2100 San
Pablo Avenue, City of Pinole, Contra Costa
County, APN 401-120-029 (letter report)
Basin Research
Associates, Inc.

Colin I. Busby

Page 4 of 6 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-030923 2005 Archaeological Field Survey for the T-Mobile BA11196-0 Installation Project, Pinole,
Contra Costa County, Calfiornia (LSA Project
No. PVS530) (letter report)
Submitter - LSA Kate Shantry LSA Associates, Inc.

Project No. PVS530
S-033061 2006 Cultural Resources Final Report of Monitoring and Findings for the Qwest Network
Construction Project, State of California
SWCA Environmental
Consultants
Nancy Sikes, Cindy
Arrington, Bryon Bass,
Chris Corey, Kevin Hunt,
Steve O'Neil, Catherine
Pruett, Tony Sawyer,
Michael Tuma, Leslie
Wagner, and Alex
Wesson
01-000027, 01-000040, 01-000087,
01-000088, 01-000089, 01-000090,
07-000138, 27-000802, 27-001191,
27-001207, 28-000467, 43-000106,
43-000141, 43-000449, 43-000573,
43-000575, 43-000754, 43-000928,
43-001071, 48-000208, 48-000211,
48-000214, 48-000441, 48-000549,
49-001583, 57-000194, 57-000198,
57-000297, 57-000301, 57-000307
Submitter - SWCA
Cultural Resources
Report Database No.
06-507;
Submitter - SWCA
Report No. 10715-
180
S-033061a 2006 Cultural Resources Final Report of Monitoring and Findings for the Qwest Network
Construction Project, State of California
SWCA Environmental
Consultants
S-033061b 2007 Final Report of Monitoring and Findings for the Qwest Network Construction Project
(letter report)
SWCA Environmental
Consultants
Nancy E. Sikes
S-036547 2009 Cultural Resources Investigation for Verizon 188588 "Tennent Ave.", 2000 San Pablo
Avenue, Pinole, Contra Costa County,
California 94564
Archaeological Resources
Technology
Carolyn Losee
S-036815 2009 Cultural Resources Investigation for AT&T CN4545-B "Hercules Avenue and San
Pablo", 215 Skelly Road, Hercules, Contra
Costa County, California 94547 (letter report)
Archaeological Resources
Technology
Carolyn Losee
S-038251 2011 Buried Archaeological Site Assessment and Extended Phase I Subsurface Explorations
for the I-80 Integrated Corridor Mobility
Project, Caltrans District 04, Alameda and
Contra Costa Counties, California, 04-ALACC-80, P.M. ALA 1.99/P.M. ALA 8.04, P.M.

CC 0.0/P.M. CC 13.49, EA 3A7761 / EA
3A7771
Far Western
Anthropological Research
Group, Inc.

Caltrans - EA Jack Meyer
3A7761;
Caltrans - EA 3A7771
S-039185 2012 Historic Property Survey Report for the San Francisco Bay Trail, Pinole Shores to
Bayfront Park Project, Pinole, Contra Costa
County, California, Caltrans District 4,
Federal Project Number 04-CC-0-EBRPTGR2DG-6075(019)
Agency Nbr - 04-CC- Neil Kaptain LSA Associates, Inc. 07-000141, 07-001076 0-EBRP-TGR2DG6075(019);
Submitter - LSA
Project #URS1102

Page 5 of 6 ends

Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 21183RS
S-039185a 2012 Archaeological Survey Report for the San Francisco Bay Trail: Pinole Shores to
Bayfront Park Project, Pinole, Contra Costa
County, California, Caltrans District 4,
Federal Project Number 04-CC-0-EBRPTGR2DG-6075(019)
Neal Kaptain LSA Associates, Inc.

S-040338 2012 Historic Property Survey Report, Hercules Intermodal Transit Center (ITC), San
Francisco Bay Trail portion, TGR2DGL5117(011)
Far Western
Anthropological Research
Group, Inc
Phillip Kaijankoski 07-000138, 07-000813, 07-001006,
07-002570, 07-003084, 07-004528,
07-004529, 07-004530, 07-004531

OHP PRN - FTA
110927A
S-040338a 2011 Cultural Resources Survey Report for the Hercules Intermodal Transit Center
HDR
S-040338b 2012 Addendum Cultural Resources Survey Report for the Hercules Intermodal Transit Center
Far Western
Anthropological Research
Group, Inc.; JRP Historical
Consulting, LLP; Foothill
Resources, Ltd.

Philip Kaijankoski,
Patricia Mikkelsen,
Rebecca Kellawan, Jack
Meyer, Joseph Freeman,
Stephan Wee, and Julia
Costello
S-040338c 2011 FTA110927A; Hercules Intermodal Transit
Center Project, City of Hercules, Contra
Costa County, California
Office of Historic
Preservation
Milford Wayne Donaldson
S-040338d 2012 FTA110927A, Hercules Intermodal Transit
Center Project, City of Hercules, Contra
Costa County, California
Office of Historic
Preservation
Milford Wayne Donaldson
S-040338e 2016 Supplemental Historic Property Survey
Report, Hercules Intermodal Transit Center
(ITC), San Francisco Bay Trail portion, 04-
CC0 CML-5117 (015)
Cindy Adams HDR Engineering, Inc.

S-044220 2013 A Cultural Resources Study for the Chelsea Wetlands Restoration Project, Lower Reach
of Pinole Creek, Hercules, Contra Costa
County, California
Virginia Hagensieker and Tom Origer & Associates
Janine M. Origer
S-047964 2015 A Cultural Resources Survey for the Pinon Avenue Conversion Properties Project,
Pinole, Contra Costa County, California
OHP PRN - Vicki R. Beard Tom Origer & Associates
NPS_2015_0821_001
S-047964a 2015 NPS_2015_0821_001; Section 106
Consultation LWCF Replacement Land for
Pinole Valley Park Conversion-06-00551 &
06-01136, Pinion Park Acquisition
Office of Historic
Preservation
Julianne Polanco

Page 6 of 6 ends

STATE OF CALIFORNIA Gavin Newsom, Governor

NATIVE AMERICAN HERITAGE COMMISSION

Page 1 of 2 ends

March 11, 2022
Dr. Dana DePietro
FirstCarbon Solutions
Via Email to: [email protected] & [email protected] Re: Native American Tribal Consultation, Pursuant to the Assembly Bill 52 (AB 52), Amendments to the California Environmental Quality Act (CEQA) (Chapter 532, Statutes of 2014), Public Resources Code Sections 5097.94 (m), 21073, 21074, 21080.3.1, 21080.3.2, 21082.3, 21083.09, 21084.2 and 21084.3, Skelly Residential Project, Contra Costa County Dear Dr. DePietro:

Pursuant to Public Resources Code section 21080.3.1 (c), attached is a consultation list of tribes that are traditionally and culturally affiliated with the geographic area of the above-listed project. Please note that the intent of the AB 52 amendments to CEQA is to avoid and/or mitigate impacts to tribal cultural resources, (Pub. Resources Code §21084.3 (a)) (“Public agencies shall, when feasible, avoid damaging effects to any tribal cultural resource.”) Public Resources Code sections 21080.3.1 and 21084.3(c) require CEQA lead agencies to consult with California Native American tribes that have requested notice from such agencies of proposed projects in the geographic area that are traditionally and culturally affiliated with the tribes on projects for which a Notice of Preparation or Notice of Negative Declaration or Mitigated Negative Declaration has been filed on or after July 1, 2015. Specifically, Public Resources Code section 21080.3.1 (d) provides:

Within 14 days of determining that an application for a project is complete or a decision by a public agency to undertake a project, the lead agency shall provide formal notification to the designated contact of, or a tribal representative of, traditionally and culturally affiliated California Native American tribes that have requested notice, which shall be accomplished by means of at least one written notification that includes a brief description of the proposed project and its location, the lead agency contact information, and a notification that the California Native American tribe has 30 days to request consultation pursuant to this section.

The AB 52 amendments to CEQA law does not preclude initiating consultation with the tribes that are culturally and traditionally affiliated within your jurisdiction prior to receiving requests for notification of projects in the tribe’s areas of traditional and cultural affiliation. The Native American Heritage Commission (NAHC) recommends, but does not require, early consultation as a best practice to ensure that lead agencies receive sufficient information about cultural resources in a project area to avoid damaging effects to tribal cultural resources.

The NAHC also recommends, but does not require that agencies should also include with their notification letters, information regarding any cultural resources assessment that has been completed on the area of potential effect (APE), such as:

1. The results of any record search that may have been conducted at an Information Center of the California Historical Resources Information System (CHRIS), including, but not limited to:

CHAIRPERSON
Laura Miranda
Luiseño

VICE CHAIRPERSON
Reginald Pagaling
Chumash

PARLIAMENTARIAN
Russell Attebery
Karuk

SECRETARY
Sara Dutschke
Miwok

COMMISSIONER
William Mungary
Paiute/White Mountain
Apache

COMMISSIONER
Isaac Bojorquez
Ohlone-Costanoan

COMMISSIONER
Buffy McQuillen
Yokayo Pomo, Yuki,
Nomlaki

COMMISSIONER
Wayne Nelson
Luiseño

COMMISSIONER
Stanley Rodriguez
Kumeyaay

EXECUTIVE SECRETARY
Christina Snider
Pomo

NAHC HEADQUARTERS
1550 Harbor Boulevard
Suite 100
West Sacramento,
California 95691
(916) 373-3710
[email protected]
NAHC.ca.gov

Page 2 of 2 ends

• A listing of any and all known cultural resources that have already been recorded on or adjacent to the APE, such as known archaeological sites;
• Copies of any and all cultural resource records and study reports that may have been provided by the Information Center as part of the records search response; • Whether the records search indicates a low, moderate, or high probability that unrecorded cultural resources are located in the APE; and
• If a survey is recommended by the Information Center to determine whether previously unrecorded cultural resources are present.

2. The results of any archaeological inventory survey that was conducted, including:
• Any report that may contain site forms, site significance, and suggested mitigation measures.

All information regarding site locations, Native American human remains, and associated funerary objects should be in a separate confidential addendum, and not be made available for public disclosure in accordance with Government Code section 6254.10.

3. The result of any Sacred Lands File (SLF) check conducted through the Native American Heritage Commission was negative.

4. Any ethnographic studies conducted for any area including all or part of the APE; and

5. Any geotechnical reports regarding all or part of the APE.

Lead agencies should be aware that records maintained by the NAHC and CHRIS are not exhaustive and a negative response to these searches does not preclude the existence of a tribal cultural resource. A tribe may be the only source of information regarding the existence of a tribal cultural resource.

This information will aid tribes in determining whether to request formal consultation. In the event that they do, having the information beforehand will help to facilitate the consultation process.

If you receive notification of change of addresses and phone numbers from tribes, please notify the NAHC. With your assistance, we can assure that our consultation list remains current.

If you have any questions, please contact me at my email address: [email protected].

Sincerely,
Cody Campagne
Cultural Resources Analyst
Attachment
Cody Campagne
Amah MutsunTribal Band of
Mission San Juan Bautista
Irene Zwierlein, Chairperson
3030 Soda Bay Road
Lakeport, CA, 95453
Phone: (650) 851 - 7489
Fax: (650) 332-1526
[email protected]
Costanoan
Guidiville Indian Rancheria
Donald Duncan, Chairperson
P.O. Box 339
Talmage, CA, 95481
Phone: (707) 462 - 3682
Fax: (707) 462-9183
[email protected]
Pomo
Indian Canyon Mutsun Band of
Costanoan
Kanyon Sayers-Roods, MLD
Contact
1615 Pearson Court
San Jose, CA, 95122
Phone: (408) 673 - 0626
[email protected]
Costanoan
Indian Canyon Mutsun Band of
Costanoan
Ann Marie Sayers, Chairperson
P.O. Box 28
Hollister, CA, 95024
Phone: (831) 637 - 4238
[email protected]
Costanoan
Muwekma Ohlone Indian Tribe
of the SF Bay Area
Monica Arellano, Vice
Chairwoman
20885 Redwood Road, Suite 232
Castro Valley, CA, 94546
Phone: (408) 205 - 9714
[email protected]
Costanoan
The Ohlone Indian Tribe
Andrew Galvan,
P.O. Box 3388
Fremont, CA, 94539
Phone: (510) 882 - 0527
Fax: (510) 687-9393
[email protected]
Bay Miwok
Ohlone
Patwin
Plains Miwok
The Confederated Villages of
Lisjan
Corrina Gould, Chairperson
10926 Edes Avenue
Oakland, CA, 94603
Phone: (510) 575 - 8408
[email protected]
Bay Miwok
Ohlone
Delta Yokut
1 of 1
This list is current only as of the date of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of the Health and Safety Code, Section 5097.94 of the Public Resource Section 5097.98 of the Public Resources Code.

This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed Skelly Residential Project, Contra Costa County.

PROJ-2022-
001047
03/11/2022 10:24 AM
Native American Heritage Commission
Native American Contact List
Contra Costa County
3/11/2022

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 250
Irvine, CA 92602
Bay Area
1350 Treat Boulevard
Suite 380
Walnut Creek, CA 94597
Central Valley
7726 N. First Street
#413
Fresno, CA 93720
Inland Empire
967 Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
CANADA

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
Muwekma Ohlone Indian Tribe of the SF Bay Area
Monica Arellano, Vice Chairwoman
20885 Redwood Road, Suite 232
Castro Valley, CA, 94546
Subject: Proposed Skelly Residential Project
Dear Vice Chairperson Arellano:

FirstCarbon Solutions (FCS) is preparing a Cultural Resources Analysis for the proposed Skelly Residential Project on behalf of the City of Hercules. As part of the environmental review process, we are conducting a cultural resources assessment.

The applicant is proposing the development of a residential subdivision consisting of 40 single-family residence lots on the approximately 7.3-acre project site. The residential lots would range from 3,836 square -feet to 6,887 square -feet.

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and California Historical Resource Information System (CHRIS). The results of the SLF records search was negative. The CHRIS Search found that there no recorded resources within the project site. However, there are 11 resources recorded within a 0.5 mile radius.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input. 2 Request Letter
Sincerely,
Dana Douglas DePietro, PhD
Director of Cultural Resources
FirstCarbon Solutions
1350 Treat Boulevard, Suite 380
Walnut Creek, CA 94597
Enc: Attachment A: Records Search Map
Please note that this letter is a request for information pertaining to a cultural resources assessment and is not notification of a project under Senate Bill (SB) 18, Assembly Bill (AB) 52 or Section 106 of the National Historic Preservation Act. Designated lead agencies under the California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA) are handling project notification and consultation requirements. Please feel free to contact me at 530.219.1432 or via email at [email protected] and thank you for your valuable assistance.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
Guidiville Indian Rancheria
Donald Duncan, Chairperson
P.O. Box 339
Talmage, CA, 95481
Subject: Proposed Skelly Residential Project
Dear Chairperson Duncan:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
The Ohlone Indian Tribe
Andrew Galvan
P.O. Box 3388
Fremont, CA, 94539
Subject: Proposed Skelly Residential Project
Dear Andrew Galvan:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
The Confederated Villages of Lisjan
Corrina Gould, Chairperson
10926 Edes Avenue
Oakland, CA, 94603
Subject: Proposed Skelly Residential Project
Dear Chairperson Gould:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
Indian Canyon Mutsun Band of Costanoan
Ann Marie Sayers, Chairperson
P.O. Box 28
Hollister, CA, 95024
Subject: Proposed Skelly Residential Project
Dear Chairperson Sayers:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
Indian Canyon Mutsun Band of Costanoan
Kanyon Sayers-Roods, MLD Contact
1615 Pearson Court
San Jose, CA, 95122
Subject: Proposed Skelly Residential Project
Dear Kanyon Sayers-Roods:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

UNITED KINGDOM

PORTUGAL
FRANCE
KENYA

AUSTRALIA

PHILIPPINES
CHINA

MALAYSIA

SINGAPORE
1 Request Letter
March 11, 2022
Amah MutsunTribal Band of Mission San Juan Bautista
Irene Zwierlein, Chairperson
3030 Soda Bay Road
Lakeport, CA, 95453
Subject: Proposed Skelly Residential Project
Dear Chairperson Zwierlein:

A Records Search map with a 0.5 mile buffer around the site is enclosed for your reference.

The CHRIS Search also found that there is one report recorded within the project boundary.

There are 3 other reports recorded within the 0.5 mile search radius. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information.

From: Dana DePietro
To: Corrina Gould; Maddie Dolan
Cc: Cultural Resources
Subject: Re: 2118.0006 Request for Information
Date: Wednesday, April 20, 2022 3:49:11 PM
Absolutely Corrina, and thank you! We'll continue to keep you posted if there are any developments, and appreciate you getting back to us with your input as always.

Best to you,
Dana
Dr. Dana Douglas DePietro
Director of Cultural Resources
FirstCarbon Solutions
(530) 219-1432
From: Corrina Gould <[email protected]>
Sent: Wednesday, April 20, 2022 3:44 PM
To: Maddie Dolan <[email protected]>
Cc: Cultural Resources <[email protected]>
Subject: Re: 2118.0006 Request for Information
Thank you for reaching out to the Tribe about the proposed project. At this time the Tribe has no further information to supply about the proposed site for this plan. As always we encourage developers in our traditional territories to remain cognizant of the facts that our tribal people lived all over the Bay Area and because of colonization and genocidal practices that reached into the late 19th century and early 20thCentury,it is not always possible to know for certain if you may find cultural resources or burials at sites where you anticipate ground disturbance. The Tribe wishes to be contacted if there are any findings. 'Uni (Respectfully),
Corrina Gould, Tribal Chair
Confederated Villages of Lisjan Tribe
On Tue, Apr 5, 2022 at 2:41 PM Maddie Dolan <[email protected]> wrote:

Hello,
Please see the attached.

Thank you!
Madelyn Dolan (she | her | hers)
Environmental Services, Assistant Project Manager
Mobile +1 925 451 7133
FirstCarbon Solutions (FCS)
An ADEC Innovation
LinkedIn | Facebook | Twitter
From: Corrina Gould <[email protected]>
Sent: Wednesday, March 23, 2022 12:04 PM
To: Maddie Dolan <[email protected]>
Cc: Cultural Resources <[email protected]>
Subject: Re: 2118.0006 Request for Information
Hello Maddie,
Can you please provide the Tribe with the CHRIS report? Thank you. 'Uni (Respectfully),
Corrina Gould, Tribal Chair
Confederated Villages of Lisjan Tribe
On Fri, Mar 11, 2022 at 2:28 PM Maddie Dolan <[email protected]> wrote:

Hello,
Attached is a request for information pertaining to a cultural resources assessment of the for the proposed Skelly Residential Project in the City of Hercules. Please feel free to contact Dana DePietro at [email protected] if you would like to provide input.

Thank you for your assistance.

Best,
Madelyn Dolan (she | her | hers)
Environmental Services, Assistant Project Manager
Mobile +1 925 451 7133
FirstCarbon Solutions (FCS)
An ADEC Innovation
LinkedIn | Facebook | Twitter
City of Hercules
Skelly Residential Project
Pedestrian Survey
FirstCarbon Solutions C:\Users\Natalie Adame\Documents\FirstCarbon Solutions\2118.0006 Skelly Residential CRA-ISMND\2118.0006 Skelly Residential Project Photolog.docx Photograph 1: Cellphone tower located in southeast corner of the project site.

Photograph 2: A horse stable and associated structure located in the central northeast portion of the project site.

Photograph 4: Representative photograph of ground cover in the project site.

Photograph 6: Photograph of the existing barns in the northeast center of the project site.

Photograph 8: Makeshift shipping container in the central portion of the project site.

Photograph 10: Shipping container located in the central portion of the project site.

Photograph 12: A recently constructed barn and awning located in the northwest portion of the project site City of Hercules
Skelly Residential Project
Pedestrian Survey
FirstCarbon Solutions C:\Users\Natalie Adame\Documents\FirstCarbon Solutions\2118.0006 Skelly Residential CRA-ISMND\2118.0006 Skelly Residential Project Photolog.docx Photograph 13: A red barn located in the northeast corner of the project site.

Photograph 14: A barn located in the central northern portion of the project site.

Photograph 16: A house located in the central portion of the project site.

Photograph 18: Photograph of the burnt house in the central portion of the project site.

Photograph 20: A burnt house located in the central portion of the project site.

Photograph 22: An interior photograph of the burnt house located in the central portion of the project site.

Photograph 24: An interior photograph of the burnt house located in the central portion of the project site City of Hercules
Skelly Residential Project
Pedestrian Survey
FirstCarbon Solutions C:\Users\Natalie Adame\Documents\FirstCarbon Solutions\2118.0006 Skelly Residential CRA-ISMND\2118.0006 Skelly Residential Project Photolog.docx Photograph 25: A small additional housing unit in the northern central portion of the project site.

Photograph 26: A red barn in the northeastern portion of the project site.

Photograph 28: A series of stables in the eastern portion of the project site.

Photograph 30: Interior photograph of the red barn in the central portion of the project site.

City of Hercules
Skelly Residential Project
Pedestrian Survey
FirstCarbon Solutions C:\Users\Natalie Adame\Documents\FirstCarbon Solutions\2118.0006 Skelly Residential CRA-ISMND\2118.0006 Skelly Residential Project Photolog.docx Photograph 31: Exterior photograph of the red barn in the central portion of the project site Photograph 32: An older nail that was added to the exterior of the red barn in the central portion of the project site. This nail was not part of the original construction of the barn City of Hercules
Skelly Residential Project
Pedestrian Survey
FirstCarbon Solutions C:\Users\Natalie Adame\Documents\FirstCarbon Solutions\2118.0006 Skelly Residential CRA-ISMND\2118.0006 Skelly Residential Project Photolog.docx Photograph 33: A photograph of stables in the central portion of the project site.

Photograph 34: A photograph of stables in the central portion of the project site.

Photograph 36: A photograph of a shed in the central portion of the project site.

Photograph 38: A photograph of stables in the central portion of the project site.

Photograph 44: Overview from the northeast corner of the project site. View SW.

Photograph 46: Overview from the southwest corner of the project site. View NE. 1443 E. Washington Blvd., #288 Pasadena, California 91104 / www.southenvironmental.com March 10, 2022
Dr. Dana Douglas DePietro
Director of Cultural Resources
FirstCarbon Solutions
Email: [email protected]
RE: Historic Built Environment Assessment for the 215 Skelly Project, City of Hercules, California
Dear Dr. DePietro:

South Environmental was retained by FirstCarbon Solutions (FCS) to prepare an historic built environment assessment report in support of the 215 Skelly (project) located in the City of Hercules, California. The purpose of this report is to determine if the proposed project will result in impacts to historic built environment resources located within or adjacent to the project site. This report was prepared in conformance with the requirements of the California Environmental Quality Act (CEQA) Guidelines § 15064.5 for historical resources.

The project site comprises an old ranch and homestead that was constructed in the 1870s. In accordance with CEQA Guidelines §15064.5, the property was evaluated for historical significance and integrity on the appropriate set of State of California Department of Parks and Recreation Series 523 Forms (DPR forms, Attachment A).

This significance evaluation and associated impacts assessment was prepared by Architectural Historian Laura Carias, MA and Principal Architectural Historian Samantha Murray, MA who meet the Secretary of the Interior’s Professional Qualification Standards for architectural history and history.

Resumes for Ms. Carias and Ms. Murray are provided in Attachment B.

Introduction
Project Description
The proposed project site is located on 7.3-acres at 215 Skelly in the City of Hercules (City) and contains a single-family residence, 58 horse paddocks, a permitted 2,400 square foot (sf) storage building, other miscellaneous outbuildings, as well as several mature trees throughout the site. The site is designated and zoned Residential Single-Family Low Density (RS-L), which allows for 2-7 units per acre, a minimum parcel size of 6,000 sf, and a maximum building height of 35 feet. The proposed project would remove the existing trees, vegetation, and existing structures and would construct 40 Historic Built Environment Assessment
215 Skelly, Hercules, CA
2 single family homes with lot sizes ranging from approximately 4,230 to 6,882 sf. The proposed project would also include a bioretention parcel; three separate utility easement parcels; and internal streets.

Project Location
The proposed project site is located at 215 Skelly in the City of Hercules on Assessor’s Parcel Number (APN) 404-020-5. The site is bordered by single-family homes to the west, north and east; two single family homes on separate lots are just west of the western project boundary and Pinole Creek is just to the west of the project site. The Burlington Northern Santa Fe (BNSF) rail line runs adjacent to the southern project boundary (Figures 1 and 2). The Pinole Senior Center Building and undeveloped land is located south of the BNSF rail line.

Historic Built Environment Assessment
215 Skelly, Hercules, CA
5 Regulatory Setting
California Register of Historical Resources
In California, the term “historical resource” includes but is not limited to “any object, building, structure, site, area, place, record, or manuscript which is historically or archaeologically significant, or is significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California” (California Public Resources Code Section 5020.1(j)).

In 1992, the California legislature established the CRHR “to be used by state and local agencies, private groups, and citizens to identify the state’s historical resources and to indicate what properties are to be protected, to the extent prudent and feasible, from substantial adverse change” (California Public Resources Code Section 5024.1(a)). The criteria for listing resources on the CRHR (enumerated below) were expressly developed to be in accordance with previously established criteria developed for listing in the National Register of Historic Places (NRHP). According to California Public Resources Code Section 5024.1(c)(1–4), a resource is considered historically significant if it (i) retains “substantial integrity,” and (ii) meets at least one of the following criteria:
(1) Is associated with events that have made a significant contribution to the broad patterns of California’s history and cultural heritage.
(2) Is associated with the lives of persons important in our past. (3) Embodies the distinctive characteristics of a type, period, region, or method of construction, or represents the work of an important creative individual, or possesses high artistic values.
(4) Has yielded, or may be likely to yield, information important in prehistory or history.

In order to understand the historic importance of a resource, sufficient time must have passed to obtain a scholarly perspective on the events or individuals associated with the resource. A resource less than 50 years old may be considered for listing in the CRHR if it can be demonstrated that sufficient time has passed to understand its historical importance (see 14 CCR 4852(d)(2)).

The CRHR protects cultural resources by requiring evaluations of the significance of prehistoric and historic resources. The criteria for the CRHR are nearly identical to those for the NRHP, and properties listed or formally designated as eligible for listing in the NRHP are automatically listed in the CRHR, as are the state landmarks and points of interest. The CRHR also includes properties designated under local ordinances or identified through local historical resource surveys.

California Environmental Quality Act
CEQA requires a lead agency determine whether a project may have a significant effect on historical resources (Public Resources Code [PRC], Section 21084.1). A historical resource is a resource listed in, Historic Built Environment Assessment
215 Skelly, Hercules, CA
6 or determined to be eligible for listing, in the CRHR, a resource included in a local register of historical resources or any object, building, structure, site, area, place, record, or manuscript that a lead agency determines to be historically significant (State CEQA Guidelines, Section 15064.5[a][1-3]).

Under CEQA, a project may have a significant effect on the environment if it may cause “a substantial adverse change in the significance of an historical resource” (California Public Resources Code Section 21084.1; CEQA Guidelines Section 15064.5(b).) If a site is either listed or eligible for listing in the CRHR, or if it is included in a local register of historic resources or identified as significant in a historical resources survey (meeting the requirements of California Public Resources Code Section 5024.1(q)), it is a “historical resource” and is presumed to be historically or culturally significant for purposes of CEQA (California Public Resources Code Section 21084.1; CEQA Guidelines Section 15064.5(a)). The lead agency is not precluded from determining that a resource is a historical resource even if it does not fall within this presumption (California Public Resources Code Section 21084.1; CEQA Guidelines Section 15064.5(a)).

A “substantial adverse change in the significance of an historical resource” reflecting a significant effect under CEQA means “physical demolition, destruction, relocation, or alteration of the resource or its immediate surroundings such that the significance of an historical resource would be materially impaired” (CEQA Guidelines Section 15064.5(b)(1); California Public Resources Code Section 5020.1(q)). In turn, CEQA Guidelines section 15064.5(b)(2) states the significance of an historical resource is materially impaired when a project:

1. Demolishes or materially alters in an adverse manner those physical characteristics of an historical resource that convey its historical significance and that justify its inclusion in, or eligibility for, inclusion in the California Register of Historical Resources; or

2. Demolishes or materially alters in an adverse manner those physical characteristics that account for its inclusion in a local register of historical resources pursuant to section 5020.1(k) of the Public Resources Code or its identification in an historical resources survey meeting the requirements of section 5024.1(g) of the Public Resources Code, unless the public agency reviewing the effects of the project establishes by a preponderance of evidence that the resource is not historically or culturally significant; or

3. Demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for inclusion in the California Register of Historical Resources as determined by a lead agency for purposes of CEQA.

Pursuant to these sections, the CEQA inquiry begins with evaluating whether a project site contains any “historical resources,” then evaluates whether that project will cause a substantial adverse change Historic Built Environment Assessment
215 Skelly, Hercules, CA
7 in the significance of a historical resource such that the resource’s historical significance is materially impaired.

City of Hercules Municipal Code § 13-31.300 Performance Standards

8. Historic Resources. Renovations, additions and other changes to historic buildings within the HTC historic town center district and the historic overlay district shall conform to the requirements of these districts in addition to the requirements set forth below. Historic buildings that are outside the above zoning districts shall conform to the requirements set forth below.

A. Prior to development on Parcels 1 and C as identified in the Land Use and Circulation Element EIR (1996), an updated architectural evaluation of the remaining Hercules Powder Company buildings shall be prepared. The elements of architectural evaluation program should include:
1) An architectural evaluation of remaining company buildings by a qualified architectural historian.
2) A determination of whether the remaining buildings are eligible for listing in the National Register of Historic Places.
3) On the basis of the above findings, the City should take action to commit the eligible buildings to permanent conservation by having them listed in the National Register of Historic Places. Adaptive reuse of listed buildings, including historically sensitive restoration, is encouraged as a means of preserving eligible structures. Restoration and renovation of buildings should be performed in accordance with the “Secretary of the Interior’s Standards for the Treatment of Historic Properties.” The standards serve as guidelines for rehabilitation, restoration, preservation, retaining and preserving historic character of the property.
4) If the above findings show that a building is not eligible for the National Register of Historic Places, then a Phase II evaluation shall identify historic resources on a parcel, and recommend appropriate mitigation measures to be incorporated into the project design using widely accepted standards for historic resources management, such as the Secretary of the Interior’s Guidelines for Rehabilitation and the State Historic Building Code.

Methods
Background Research
Background research was conducted on the property located at 215 Skelly to establish a thorough and accurate historic context, and to confirm the development history of the property (see DPR form set in Attachment A). This included a review of all available building permits; historical newspapers covering the Bay Area via newspapers.com; historic aerial photographs of the project site via National Historic Built Environment Assessment
215 Skelly, Hercules, CA
8 Environmental Title Reference (NETR) and the University of Santa Barbara FrameFinder Maps; and applicable primary and secondary sources on file with local libraries.

A review of the State Office of Historic Preservation’s Historic Built Environment Resource Directory revealed that the property at 215 Skelly (historically known as the Ellerhorst Home) was previously recorded and evaluated for historical significance by the Contra Costa Planning Department in 1975 and assigned primary number 07-001005. A Historic Resources Inventory form was prepared for the property, and it was found eligible for its associations with historical events and people. As part of the current study, the original evaluation was updated on the appropriate set of DPR forms (see Attachment A for the original and updated evaluation).

Survey
FCS Senior Archaeologist, Dr. Dana DePietro completed a pedestrian survey of the project site on January 20, 2021. The built environment survey entailed walking the site and documenting the exterior of all buildings and structures with notes and photographs.

Findings
One historic built environment resource over 45 years old was identified within the project site: the previously identified Ellerhorst Home (P-07-001005) which consists of the main residence built c. 1873 along with several other outbuildings and structures. The entire property was recorded and evaluated for historical significance on the appropriate set of DPR Forms in consideration of CRHR criteria and integrity requirements (Attachment A). Although the property has important historical associations with early settlement patterns and significant individuals in Hercules, a recent fire destroyed much of the main residence such that the property can no longer convey these important associations.

Therefore, as a result of compromised integrity, the property was found not eligible for designation.

No historical resources were identified within the project site as a result of this study. Therefore, with respect to built environment resources, the proposed project will have a less than significant impact on historical resources under CEQA.

Should you have any questions regarding this report or its findings, please do not hesitate to contact us at [email protected].

Sincerely,
_______________________ _______________________
Laura Carias, MA Samantha Murray, MA
Architectural Historian Principal Architectural Historian Historic Built Environment Assessment
215 Skelly, Hercules, CA
9 Attachments
A. DPR Form Set for 215 Skelly
B. Resumes
ATTACHMENT A.

DPR Form Set for the Ellerhorst Home (215 Skelly)

Page 1 of 21 ends

P1. Other Identifier: 215 Skelly
DPR 523A (9/2013) *Required information
State of California ⎯ The Resources Agency Primary # P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
PRIMARY RECORD Trinomial
NRHP Status Code 6Z
Other Listings
Review Code Reviewer Date
*P2. Location:  Not for Publication ■ Unrestricted
*a. County Contra Costa and (P2c, P2e, and P2b or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad Mare Island Date 2021 T 02 N ; R 04 W ;  of  of Sec 22 ; MD B.M. c. Address 215 Skelly City Hercules Zip 94547
d. UTM: (Give more than one for large and/or linear resources) Zone , mE/ mN e. Other Locational Data: (e.g., parcel #, directions to resource, elevation, decimal degrees, etc., as appropriate) APN 404-020-012-5. The subject property is located on a 7-acre parcel bound by Pinole Creek to the west, the Atchison Topeka/Santa Fe Railroad to the south, and single-family subdivisions to the north and east.
*P3a. Description:

The subject property is a highly altered, two-story single-family residence and farm with associated ancillary structures. The main residence was recently destroyed by a fire but was originally designed in the Hall-and-Parlor variant of the National style of architecture and later modified with Spanish Colonial Revival-style elements. Although most of the roof is now gone, the building was originally capped by a side-gabled roof and other secondary roof types that included flat and shed roofs, all clad in composition shingles. The primary, asymmetrical elevation (Photograph 1) faces south and is located beneath a secondary roof that features three arches. All windows were incinerated by the fire (see Continuation Sheet).
*P3b. Resource Attributes: (List attributes and codes) HP2. Single family property/ HP33. Farm/ranch *P4. Resources Present: ■ Building
■ Structure  Object  Site  District 
Element of District  Other (Isolates,
etc.)
P5b. Description of Photo: (view,
date, accession #) Photograph 1.

Main (south) elevation of
residence, view to
northwest
*P6. Date Constructed/Age and
Source: ■ Historic  Prehistoric  Both
c.1873 (Contra Costa County
Assessor)
*P7. Owner and Address:

MORI ROBERTA TRE
2559 San Marin Ln.

Sacramento, CA 95835-2193
*P8. Recorded by:

Laura Carias and Sam Murray
South Environmental
Pasadena, CA 91104
*P9. Date Recorded: 3/4/2022
*P10. Survey Type: Pedestrian
*P11. Report Citation: (Cite survey
report and other sources, or enter "none.")
Historic Built Environment
Assessment for the 215
Skelly Project, Hercules, California (South Environmental 2022) *Attachments: NONE ■Location Map ■Continuation Sheet ■Building, Structure, and Object Record Archaeological Record District Record Linear Feature Record Milling Station Record Rock Art Record Artifact Record Photograph Record  Other (List):

Page 2 of 21 ends

*Map Name: Mare Island, California *Scale: 1:24,000 *Date of map: _2021__ DPR 523J (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary # P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI#
LOCATION MAP Trinomial

Page 3 of 21 ends

DPR 523K (Rev. 1/1995)(Word 9/2013) NOTE: Include bar scale and north arrow.

State of California Natural Resources Agency Primary # P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI#
SKETCH MAP Trinomial
*Resource Name or # (Assigned by recorder) Ellerhorst Home *NRHP Status Code 6Z

Page 4 of 21 ends

DPR 523B (9/2013) *Required information
State of California The Resources Agency Primary # P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI#

BUILDING, STRUCTURE, AND OBJECT RECORD
B1. Historic Name: Tennent Ranch, Ellerhorst Ranch, McLeod Ranch B2. Common Name:

B3. Original Use: Single-family residence/farm B4. Present Use: Vacant *B5. Architectural Style: National Style, Hall-and-Parlor variant *B6. Construction History: (Construction date, alterations, and date of alterations) Constructed c. 1873 (Contra Costa County Assessor).

Second story and several room additions c. 1881 (Vincent 2010) *B7. Moved? ■No Yes Unknown Date: Original Location:
*B8. Related Features: Barns, stables, storage buildings B9a. Architect: n/a b. Builder: Samuel Tennent
*B10. Significance: Theme n/a Area n/a
Period of Significance n/a Property Type n/a Applicable Criteria n/a (Discuss importance in terms of historical or architectural context as defined by theme, period, and geographic scope. Also address integrity.)
Historical Overview of Hercules’ Development
In 1823, Don Ignacio Martinez applied for an approximately 18,000-acre land grant that he named Rancho del Pinole. In 1837, Martinez settled his family in Refugio Valley, bringing his wife Maria and 11 children to live in the adobe he had built there (Mariotti et al. 2009). When Martinez died in 1848, the rancho was divided between his heirs. An 1857 Plat of the Rancho Del Pinole shows 29,039-acres confirmed to Maria, a significant increase from the original grant acreage (California Digital Library 1857). Ignacio Martinez’s death coincided with the end of the Mexican period in California and the arrival of settlers seeking fortunes promised by the Gold Rush.

These events ultimately brought an end to the rancho-era in Contra Costa County (Mariotti et al. 2009 and Posedel et al. 2011). “This was a time of rapid growth and change for Pinole, highlighted by the Americanization of the open rancho lands to fenced farmlands” (Mariotti et al. 2009:7)(see Continuation Sheet).

B11. Additional Resource Attributes: (List attributes and codes) n/a *B12. References: See Continuation Sheet
B13. Remarks:
*B14. Evaluator: Sam Murray and Laura Carias,
South Environmental
*Date of Evaluation: 3/4/2022
(Sketch Map with north arrow required.)
(This space reserved for official comments.)
DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
Trinomial

CONTINUATION SHEET
Property Name: Ellerhorst Home
____________________________________________________________________________ Page __5__ of __21__
*P3a. Description (Continued): The north elevation (Photograph 2) features a full-width room addition beneath a shed roof. A secondary entrance is centrally located on the north elevation. Windows on the first floor of the north elevation feature single hung aluminum windows; the second floor has caved in due to the fire. A chimney is visible on the north roof slope. A flat roof, one-story addition is located on the east elevation (Photograph 3).

Photograph 2. North elevation; facing southwest.

Photograph 3. East elevation; facing west.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
Trinomial

CONTINUATION SHEET
Property Name: Ellerhorst Home
____________________________________________________________________________ Page __6__ of __21__
There are several other buildings on the property related to its former use as a farm.

Two separate rudimentary barns are located east of the residence. Animal stalls are located south of the residence beneath a eucalyptus grove. Numerous ancillary buildings are located to the north and northeast of the residence.

The subject property is in an open area with mature grass and trees. An asphalt driveway runs along the eastern border of the parcel and circles around and leads down to the east elevation of the residence.

The following table provides a photograph (column 1) and description (column 2) of each component of the subject property as identified on the Sketch Map above. The main residence is identified as ID #1. A review of historic aerial photographs indicates that the residence and most of the ancillary buildings were in place by circa 1948 and the more contemporary ones were added in the early 2000s. An Assessor effective year date of c.1873 is the assumed date of original construction for the primary residence. 2 – Stables
West (left) and south (right) elevations,
view northeast
Built circa 2008
Single-story ancillary building with a
flat, corrugated metal roof. The building
is clad with painted plywood and feature
several rudimentary wood paneled doors on
its south elevation.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
Trinomial

CONTINUATION SHEET
Property Name: Ellerhorst Home
____________________________________________________________________________ Page __7__ of __21__
3 – Shed
South (left) and east (right) elevations,
view northwest.

Built circa 2009
Double-height structure with an open front
elevation, capped with a flat roof and
enclosed on three sides with corrugated
metal siding.
4 – Garage
South elevation, view northwest
Built circa 1948
Garage with side-gabled roof featuring
sliding barn doors on the south elevation.

The building is clad in horizontal wood
siding and features a wood sash, doublehung window on the east elevation.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
Trinomial

CONTINUATION SHEET
Property Name: Ellerhorst Home
____________________________________________________________________________ Page __8__ of __21__
5 – Storage Shed
South (left) and east (right) elevations,
view northwest
Built circa 1948
Single-story storage shed with a sidegabled roof clad in deteriorated composition shingles. The building is clad
in vertical wood siding. The east
elevation features large open bays with a
single horizontal paneled door.
6 –Barn/Stables
North (left) and west (right) elevations,
view southeast.

Built circa 1948
Double-height barn with a wood framed
structural system. The building is capped
by a front gabled roof clad with
composition shingles. An addition to the
north elevation is capped by a shed roof.

The building is clad with vertical boardand-batten siding. Rudimentary door openings are located on the west
elevation. The north and south elevations
are open to the elements and feature
extensions of the rafters, supported by
wood posts.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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7 – Stables
North elevation, view south
Built circa 2002
Single-story wood framed stables and shed.

The middle section of the rectangular
building is open.
8 - Storage Shed
North (left) and west (right) elevations,
view southeast
Built circa 1948
Single-story storage shed with frontgabled roof. The building is clad in horizontal wood siding. A single door is
located on west elevation and one wood
sash double-hung window is located on the
north elevation. The window and door
feature wide wood surrounds.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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9 – Barn
North (left) and west (right) elevations,
view southeast
Built circa 1948
Double-height barn with a rectangular
floor plan, capped by a front-gabled roof
clad in rolled asphalt. Several additions
were made to the north and south
elevations.
10 – Cell phone tower
View southeast
Built circa 2012
Faux pine tree cell phone tower located on
a concrete pad surrounded by asphalt.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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11 – Stables/Shed
East elevation, view west
Built circa 2009
Three-sided shed with a flat, corrugated
metal roof, and exterior walls clad in
plywood sheets. The east elevation is open
to the elements and supported by squared
wood posts.
12 - Storage Shed
South elevation, view north
Built circa 1948
Rudimentary shed with square floor plan, a
flat, corrugated metal roof, and unpainted
plywood siding. “Door” and “window”
openings appear to have been roughly sawed
out of plywood siding.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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13 – Water tank
View north
Built circa 2014
Water tank.
*B10. Significance (Continued):

Some of the most significant changes made to the Pinole/Hercules area were a direct result of two recent immigrants to Pinole, Dr. Samuel Tennant and Bernardo Fernandez Tennant was a surgeon from England who married Rafaela Martinez, heiress to a significant piece of Rancho Del Pinole that included the downtown and waterfront areas (Mariotti et al. 2009). Tennant, who has a street named after him today, platted the original blocks for the town of Pinole and sold/leased properties throughout the area.

Fernandez, a sailor from Portugal, arrived in 1854 and established a shipping route between San Francisco and Pinole. He also purchased his water-front property from Dr.

Tennant where he built a mansion in 1894 that still stands today and is listed in the National Register of Historic Places (Mariotti et al. 2009 and Posedel et al 2011).

In 1878, California Powder Works (CPW) approached these early landowners about purchasing land for their new dynamite factory. They selected a 45-acre site near Pinole in what would eventually become the City of Hercules and began construction in 1879. The CPW plant officially opened and started production in 1881 (Newton 2020).

The site was also near a waterfront station on the new Northern Railway line, constructed in 1877 by the Central Pacific to link Oakland with smaller cities like Martinez and Pinole. The station was originally named Powning after the CPW’s general manager, but following his retirement in 1894, was renamed Hercules, after the dynamite powder the company produced (Posedel et al 2011 and Pioneer 2020).

A second rail line made its way to Pinole, directly south of the subject property in 1899. Known as the San Francisco & San Joaquin Valley railroad, it was created to compete with the Southern Pacific Railroad in hopes of lowering shipping costs being charged to farmers sending crops to San Francisco. Claus Spreckels pledged $500,000 to build the rail line if $3 million could be raised. Small investors donated to the cause giving the rail line the nickname “People’s Railroad.” The rail line was bought out by Santa Fe Railroad in 1898, just before it came to Pinole (Hooper 2014).

The City of Hercules incorporated on December 15, 1900, after the town had struggled to get laws passed by the County Board of Supervisors in support of the new CPW plant.

The first City Council was comprised of CPW plant managers and most of laws and ordinances passed were primarily intended to benefit the new plant (City of Hercules DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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2021). CPW sold their dynamite under the name “Hercules Powder” and had already named a railway station after their product, so the name Hercules was a natural choice for the new city (City of Hercules 2021).

Most workers in the explosives industry were Chinese immigrants, many of whom had come to California during the Gold Rush. After being pushed out of mining through racist state legislation that levied heavy taxes on Chinese and Mexican laborers, many Chinese workers turned to railroad construction and eventually the explosives industry where they worked in dynamite factories, often under some of the most dangerous conditions (Hernandez 2021). At the beginning of the company’s history, Chinese workers made up 80% of the workforce typically working in the mixing house where they had the “extremely hazardous task of mixing highly unstable nitroglycerin with inert materials to make dynamite powder.” (Brightman 2022). This caused the Chinese to suffer great causalities. Between the years 1882 and 1908, there were seven explosions. Of the 106 casualties, 88 were Chinese (Brightman 2022).

At the Hercules plant, Chinese laborers lived in wooden dormitories near the plant's main entrance. “As many as 375 Chinese Americans resided in the long, narrow, box-like buildings that contained three tiers of bunks stretching the length of the walls in the sleeping quarters” (NPS 2004). By the turn of the twentieth century, Chinese laborers were pushed out of the Hercules factory altogether, changing the City’s demographics as described by the Hercules Historical Society (Ruppenstein 2021):

With increasing anti-Chinese sentiment in California and the United States in the 1860s and 1870s, and the passing of the Chinese Exclusion Act in 1882, the company town experienced a demographic shift. At the town’s opening, Chinese workers made up the majority of the plant’s labor force and by 1913 the town no longer employed Chinese workers.

In their honor, a marker and a memorial tree was installed in 2008 along a path at Frog Pad Park which reads (Ruppenstein 2021):

This Gingko tree is dedicated in recognition of the contributions of Chinese laborers who toiled in anonymity at the Hercules Powder Works Factory from 1881 until 1912.

The Hercules plant produced 7 million pounds of TNT during World War I. During World War II, it claimed to have produced 1.8 billion pounds of ordnance. The plant shifted to making fertilizer after World War II and eventually closed in 1977 (Pioneer 2020).

Property History
County Assessor records indicate that the subject property was constructed in 1873.

The earliest confirmation of the property’s existence comes from the 1902 Napa, California quadrangle map, which shows the subject property as a small black dot directly east of Pinole Creek and directly north of the Atchison Topeka and Santa Fe Railroads. Sanborn Fire Insurance Maps for Pinole from 1910 and 1925 show the southernmost edge of the subject property, however most of it is cut-off since it falls outside of the city boundary.

The first owners of the property were Dr. Samuel Tennent and Rafael Martinez Tennent, daughter of Ignacio Martinez. The land on which the subject property sits was part of the original land grant that she inherited from her father upon his death (Vincent 2016). In the 1870s, “The doctor built the old ranch home (Figure 1), at which time a DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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building of unheard magnificence. The lumber was brought around the Horn, all pieced and numbered. Carpenters were paid sixteen dollars per day, and such extra timber as was needed was paid for at the rate of $250 per one thousand feet.” (Contra Costa Gazette 1897). The couple had five children and were known for raising fine horses.

The family had a racetrack near their ranch where neighbors would come on Sunday to watch the horse races. Kate, their oldest daughter, was the “darling of riders with her side-saddle riding habit hanging to the ground.” (Vincent 2019).

Figure 1. Drawing of the subject property c. 1870s prior to residence’s Spanish-style remodel and construction of the Burlington Northern Santa Fe (BNSF) railroad (Mariotti et al. 2009)
Kate grew up and married Charles S. Cousins. Charles was a businessman who came to Pinole in 1870 where he met Kate. He was elected Contra Costa’s County Recorder in 1882 and held the office until 1895. In 1888, Kate and her brothers James and John partitioned the Tennent ranch into divisions, with Kate keeping the land on which the subject property sits (Vincent 2016). It’s unclear where she lived exactly, although the 1880 census lists her address in Pinole, Contra Costa, California at dwelling number 515, no street name listed (1880 Census). Although other accounts state that Kate sold the subject property to Christopher and Christina Ellerhorst in 1881, an article in the Oakland Tribune states that the Ellerhorsts moved into the subject property in 1876 and officially purchased the ranch from Kate in 1911 (Vincent 2010; Paoli 1975).

The Ellerhorsts had six children and operated a dairy and farm at the subject property. Residents of Pinole have memories of travelling to the Ellerhorst farm to purchase fresh vegetables and milk. All six children: Frances, Dora, Alice, Annie, Emma, and Henry worked on the farm (Vincent 2010). The Ellerhorst family also remodeled the subject property to its current configuration, adding the Spanish DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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Colonial Revival-style arches to the porch on the south elevation (Figure 2, Vincent 2019).

Figure 2. Undated photograph of the Ellerhorst Home after its Spanish Colonial Revival-style remodel in the early twentieth century (Vincent 2019:10) There was a railroad depot across from the subject property on the south side of the tracks as seen on the 1910 Sanborn Fire Insurance Map. The Southern Pacific Railroad constructed its own depot south of the subject property. Although the exact date of construction is unknown, it was present in a 1908 historic photograph used for a Pinole postcard. The depot was replaced in 1945 by a “rare example of an architectural style developed for Santa Fe depots on the coast line during World War II.” The depot was demolished August 1998 (Werkema 2004). Christina Ellerhorst’s obituary states that the funeral was held at the “family residence in Pinole thence by the 1:30 P.M. Santa Fe train to Oakland where the interment will take place.” (Daily Gazette-Martinez 1911).

Frances Ellerhorst, the oldest child, became a school teacher at age 21. Her first job was at the Sheldon School in El Sobrante. By 1886 Pinole had its first one-room school called Plaza School. In 1901 both she and her sister Alice worked at Plaza School as teachers before Frances was promoted to principal. In 1906, Frances became “the first principal of the new, and much larger, Pinole-Hercules School, on a hill east of Pinole." Frances worked there until she retired in 1940 (Vincent 2010). Ellerhorst Elementary School in the city of Pinole was constructed in 1959 and named in honor of Frances (Ellerhorst Elementary School n.d.).

The Ellerhorst children were well known in the community. Emma was a dedicated church worker and loved children; Annie was a private secretary for the superintendent of the Hercules Powder Company; Dora was a home maker and gardener at the ranch; and Henry was a big man that did the heavy chores around the ranch and was known for his cheerful disposition. They were all devoted members of the Pinole Hercules Methodist Church. The Pinole Hercules Methodist Church was constructed in 1925 and the church DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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dedicated a stained-glass window in their honor (Vincent 2010). The Ellerhorsts were immortalized when a subdivision located southeast of the subject property named the streets after all six Ellerhorst children. All of the Ellerhorst children lived on the farm until their deaths (Vincent 2010). Frances was the last remaining Ellerhorst to live in the house. She died in 1973 at the age of 98 (Oakland Tribune 1973).

Following Frances’s death, the subject property was sold to Saranell and John McLeod in 1975. They were the first family private homeowners in Hercules since the town incorporated in 1913. As the Oakland Tribune notes in its 1975 article, “Until a few years ago, Hercules was a company town and the handful of wood-frame houses still clustered near the Hercules fertilizer plant are company owned.” (Paoli 1975).

The McLeods lived on the subject property with their three teenage children, Roberta, Heather, and John Jr. John Sr., a retired Standard Oil tanker captain, died in 1982 (Vincent 2019). Saranell lived at the property until her death in 2019 (Vincent 2019).

Architectural Style
The subject property is consistent with the Hall-and-Parlor variant of the National style of architecture. The National style, a subset of the American Folk house, changed dramatically with the arrival of the railroad (McAlester 2013). The average dwelling was no longer restricted to local building materials such as logs, sod, or heavy hewn frames and could now be constructed using light balloon framing. The Halland-Parlor variant of the style was typically two rooms wide, one room deep, and was popular during pre- and post-railroad America. This style is typically altered with added porches, chimneys, and rearward extensions, and is void of ornamentation.

National style houses were typically constructed by a local carpenter and not an architect.

Character defining features:
• Modestly sized, 1-2 stories in height
• Uses a standard Folk plan and roof plan: gable front; gable front-and-wing; hall and parlor (side gabled, 1 room deep); I-House (side gabled 2 story, 1 room deep, usually with rear addition); pyramidal; or massed plan side gable (more than 1 room deep)
• Predominantly wood cladding
• Overly simple exterior ornamentation, if at all: can be Greek revival inspired (molded cornice, eave returns); Victorian/Queen Anne (gable pendants, spindlework porch components); or Colonial revival (bilateral symmetry; pediments) especially for Pyramidal forms
• Non-integral porches: stoop, portico, partial width, full width, wraparound, or 2- story; will usually be shed or hip roofed
• Usually with simple or turned wood posts and wood railing balustrade. • Windows are typically 1-over-1, 2-over-2, 4-over-4, 6-over-6, or multi-light-oversingle light single-hung or double hung, wood sash windows and are usually placed individually on the elevation, not grouped or paired
• Cross-gabled roof
• T- or L- shaped floor plan
• Wood siding
• Shed roof porch
• Devoid of ornamentation
DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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Significance Evaluation
The following presents an evaluation of the subject property in consideration of California Register of Historical Resources (CRHR) criteria for resource designation.

CRHR Criterion 1. Is associated with events that have made a significant contribution to the broad patterns of local or regional history or the cultural heritage of California or the United States
The subject property was constructed c. 1873 on one of the original California rancho land grants. The land was owned by Ignacio Martinez, Mexican land grantee, before it was divided amongst his children. His daughter, Rafaela Martinez inherited the land on which the subject property is located. Her husband, Dr. Samuel Tennent, who in 1857 platted the original blocks for the town of Pinole and sold/leased properties throughout the area, built the original residence for them. The subject property is also associated with the Ellerhorst family who lived and later owned the subject property for nearly a century from 1876 to 1973. The subject property is a very rare example of a residence/farm constructed during the early settlement period in the Pinole/Hercules area. The residence was built around the same time as the waterfront Northern Railway line, prior to the construction of the BNSF railroad in 1899, prior to the construction of the CPW factory in 1881 which drove the region’s economy for decades, and prior to cityhood in 1900. The main residence was significantly damaged in a recent fire such that it can no longer convey its original associations with the city’s earliest development period. Therefore, while the subject property is eligible under CRHR Criterion 1 for its associations with important patterns of development related to early settlement, it lacks requisite integrity to convey its historical significance under this criterion.

CRHR Criterion 2. Is associated with the lives of persons important in our past.

The subject property is associated with Dr. Samuel Tennent, Rafaela Martinez de Tennant, and the Ellerhorst family. Dr. Samuel Tennent platted the streets in Pinole and sold and leased land. Rafaela Martinez de Tennent was the daughter of Ignacio Martinez, who owned one of the original California rancho land grants for Rancho de Pinole. Although they were the original owners of the property, they only lived there a few years before moving. The contributions that Samuel and Rafael Tennent made to the community were not completed while they were in residence at the subject property.

Frances, Dora, Alice, Annie, Emma, and Henry Ellerhorst were well-known and respected members of the community who contributed to the local school and church. In recognition of her service to the children of Pinole, the Ellerhorst Elementary School was named after Frances Ellerhorst. Frances lived at the subject property most of her productive life, was the daughter of early settlers, and is the individual most closely associated with the property. The main residence was significantly damaged in a recent fire such that it can no longer convey its original associations with the Ellerhorst family. Therefore, while the subject property is eligible under CRHR Criterion 2 for its associations with locally significant person, Frances Ellerhorst, it lacks requisite integrity to convey its historical significance under this criterion.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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CRHR Criterion 3. Embodies the distinctive characteristics of a type, period, region, or method of construction, or represents the work of an important creative individual, or possesses high artistic values.

The subject property was constructed in the Hall-and-Parlor variant of the National style of architecture c. 1873 and was remodeled c. 1880. Character-defining features of the subject property include the modestly sized residence, originally one-story in height (remodeled c. 1880); side gabled roof and one room deep (remodeled c. 1880); non-integral porches; individual wood sash 4-over-4 windows (destroyed by fire); stucco siding, and three arches at the primary porch. The subject property recently suffered a fire and the main residence has been heavily compromised. Therefore, the subject property is not eligible under CRHR Criterion 3.

CRHR Criterion 4. Has yielded, or may be likely to yield, information important in prehistory or history.

The subject property is not significant as a source, or likely source, of important historical information nor does it appear likely to yield important information about historic construction methods, materials or technologies. Therefore, the property is not eligible under CRHR Criterion 4.

In summary, while the subject property is eligible under CRHR Criterion 1 for its associations with early settlement patterns in Pinole/Hercules and under Criterion 2 for its associations with locally significant person Frances Ellerhorst, the main residence was significantly damaged in a recent fire such that it can no longer convey these associations. A detailed discussion of the subject property’s integrity issues is provided below.

Integrity
Location: The subject property retains integrity of location. The property is sited on the original location it was constructed in its original orientation.

Design: The subject property lacks integrity of design. The main residence at the subject property was destroyed by a recent fire, including loss of the entire roof structure, second story, all windows, and gutting of the interior, such that it no longer retains integrity of design.

Setting: The subject property lacks integrity of setting. Although the subject property is still located on several acres of land, it is surrounded by housing developments that have destroyed the historic setting.

Materials: The subject property lacks integrity of materials. The recent fire destroyed most of the main residence’s original materials.

Workmanship: The subject property lacks integrity of workmanship. The recent fire destroyed most evidence of the original craftsmanship.

Feeling: The subject lacks integrity of feeling. Destruction of the primary residence has irreparably altered the feeling of the larger property.

DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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Association: The subject property has significant associations with early settlement patterns in Pinole/Hercules (Criterion 1) and is also associated with the Ellerhorst family that owned the property for almost a century (Criterion 2). However, the material loss of the main residence has severed the property’s ability to convey these associations.

For the reasons provided above, the subject property is not eligible for designation in the CRHR as its integrity has been compromised such that it can no longer convey its significance.

References
Brightman, Dean.
2022. “How Anti-Asian Racism Proved Deadly at Hercules Dynamite Plant.” Bay City News Foundation. January 6, 2022. Accessed on March 7, 2022:
https://patch.com/california/pinole-hercules/how-anti-asian-racism-proveddeadly-hercules-dynamite-plant California Digital Library
1857. “Plat of the Rancho del Pinole.” Accessed on December 29, 2021:
http://imgzoom.cdlib.org/Fullscreen.ics?ark=ark:/13030/hb9s20091c/z1&order=2&bra nd=oac4
City of Hercules.
n.d. “Our History” Accessed December 29, 2021:
https://www.ci.hercules.ca.us/our-city/our-history
Contra Costa Assessor’s Office
2022. Maps and Property Information. Accessed March 4, 2022:
https://www.contracosta.ca.gov/552/Maps-Property-Information Contra Costa Gazette
1897. “Pinole in Early Times.” Newspapers.com: Contra Costa Gazette (Martinez, California). April 24, 1897, p. 2.

Daily Gazette-Martinez
1911. “Old Resident Died in Pinole Friday.” Newspapers.com: Daily GazetteMartinez (Martinez, California). March 4, 2011, p, 3.

Ellerhorst Elementary School
n.d. “About Ellerhorst Elementary.” Accessed March 3, 2022:
https://www.wccusd.net/page/875
Hernandez, Carolina
2021. “The Unnamed Dead: Chinese labor powered the risky explosives industry.” Monument to Extraction. Accessed on December 29, 2021:
https://monumenttoextraction.org/stories/chinese-labor/ Hopper, Ken
2014. “History: Bakersfield freed from railroad tyranny.” December 26, 2014.

Accessed online March 9, 2022:
https://www.bakersfield.com/19akersfield_life/history-bakersfield-freed-fromrailroad-tyranny/article_dc1bc867-d6d8-53c1-9e11-984b83d8b897.html DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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Mariotti, Joseph, George Vincent, and Jeff Rubin
2009. Images of America: Pinole. Charleston, South Carolina: Arcadia Publishing.

McAlester, Virginia S.
2013. A Field Guide to American Houses (Revised): The Definitive Guide to Identifying and Understanding America's Domestic Architecture. New York City, New York: Alfred A Knopf.

National Park Service (NPS)
2004. “A History of Chinese Americans in California: Historic Sites.” Accessed on December 27, 2021:
https://www.nps.gov/parkhistory/online_books/5views/5views3h41.htm NETR (Nationwide Environmental Title Research, LLC)
2022. Historic Aerial Photographs of 215 Skelly, City of Hercules, CA dating from 1948, 1958, 1959. 1968, 1980, 1982, 1988, 1993, 2002, 2005, 2009, 2010, 2012, 2014, 2016, 2018 . Accessed February, 25 2022.
https://historicaerials.com/viewer
Oakland Tribune
1973. “Miss Frances Ellerhorst Dies at 93 [sic].” Newspapers.com: Oakland Tribune (Oakland, California). July 25, 1973, p. 22.

Paoli, Richard
1975. “Family in a 100-Year-Old House.” Newspapers.com: Oakland Tribune (Oakland, California). June 24, 1975, p. 10.

Pioneer, The
2020. “A blast from the past about the history of Hercules.” Accessed December 29, 2021: https://pioneerpublishers.com/a-blast-from-the-past-about-the-historyof-hercules/ Posedel, Jennifer and Stephen Lawton
2011. Images of America: Hercules. Charleston, South Carolina: Arcadia Publishing.

Ruppenstein, Andrew
2021. “Hercules Power Works Chinese Labors Memorial.” Accessed on December 29, 2021: https://www.hmdb.org/m.asp?m=174519
UCSB (University of California, Santa Barbara)
2021. Historic aerial photographs of 215 Skelly, City of Hercules, CA dating from 1939, 1965. Map & Imagery Laboratory (MIL) UCSB Library. Accessed February 21, 2022:https://mil.library.ucsb.edu/ap_indexes/FrameFinder/ United States Census
1880. Ancestry.com
Vincent, George R.
2010. “What’s In a Name?” Pinole Historical Society Newsbriefs. Fall 2010.

Accessed December 29, 2021:
http://pinolehistoricalsociety.org/phsnewsbriefsfall2010.pdf DPR 523L (Rev. 1/1995)(Word 9/2013) *Required information State of California Natural Resources Agency Primary# P-07-001005 (Update) DEPARTMENT OF PARKS AND RECREATION HRI #
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2016. “The House that ??? Built.” Pinole Historical Society Newsbriefs. Winter 2016. Accessed December 29, 2021:
http://www.pinolehistoricalsociety.org/phsnewsbriefswinter2016.pdf 2019. “Remembering Saranell McLeod and the Last Farm in Hercules.” Pinole Historical Society Newsbriefs. Fall 2019. Accessed December 29, 2021:
http://pinolehistoricalsociety.org/phsnewsbriefsfall2019.pdf Werkema, Evan
2004. “Some Recent Losses: Depots.” Accessed March 9, 2022:
http://atsf.railfan.net/depots/depoted.html

ATTACHMENT B.

Resumes
Email: [email protected]
Mobile: 310-809-4696

EDUCATION
M.A., Public History,
California State University,
Sacramento, 2006
B.A., History and Chicano
Studies, California State
University, Dominguez Hills,
2003

PROFESSIONAL

AFFILIATIONS
California Preservation
Foundation
Society of Architectural
Historians
National Trust for Historic
Preservation
Laura G. Carias, MA

ARCHITECTURAL HISTORIAN
Laura Carias has over 15 years of experience in the field of historic and cultural resources evaluation, identification, documentation, and preservation Ms. Carias specialized in historic resources assessments including historic significance evaluation in consideration of the California Register of Historical Resources (CRHR), and the National Register of Historic Places (NRHP), and local-level evaluation criteria. She also has experience in intensive-level field surveys, historic structure reports, design consultation, conformance with the Secretary of the Interior’s Standards for the Treatment of Historic Properties, Historic American Buildings Survey and Historic American Engineering Record documentation, local Mills Act contracts, and local, state, and nation landmark designations.

Ms. Carias meets the Secretary of the Interior’s Professional Qualification Standards for both Architectural History and History. She has experience preparing environmental compliance documentation in support of projects that fall under the California Environmental Quality Act (CEQA/National Environmental Quality Act (NEPA), and Section 106 of the National Historic Preservation Act (NHPA).

EXPERTISE
• CEQA, NEPA, and Section 106 of the NHPA compliance
documentation in consideration of impacts to historical resources, and historic properties
• Historic resource significance evaluations in consideration of NRHP, CRHR, and local designation criteria.
• Project design review for conformance with the Secretary of the • Interior’s Standards.
• Preparation of archival documentation for HABS/HAER/HALS. • Historic Structure Reports
• Historic Preservation Certification Part 1 and 2 Tax Credit Applications
Laura G. Carias, MA Resume, Page 2

RECENT PROJECT EXPERIENCE
G-P Site Restoration Project, Long Beach, California. November 2021 – ongoing. While working for her previous firm, Ms. Carias served as architectural historian and principal author of the Historic Resources Cultural Report (report). The Port of Long Beach retained LSA Associates to prepare a cultural resources study in support of the Georgia-Pacific Gypsum Board Plant located at the port in Long Beach, California. The study included a pedestrian survey of the subject property for building and structures over 45 years of age; building development and archival research for the identified buildings located within the project site; recordation and evaluation of cultural resources identified within the study area for the National Register of Historic Places (NRHP), California Register of Historical Resources (CRHR), and local eligibility criteria and integrity requirements; and an assessment of potential impacts to historical resources in conformance with CEQA and all applicable local municipal code and planning documents. Responsibilities included site specific background research, authoring the cultural technical report. Prior to South Environmental, LSA Associates.

Historic Built Environment Evaluation Report for the Sycuan Fee to Trust Project, Sycuan Band of the Kumeyaay Nation Reservation, San Diego County, California (2020). While working for her previous firm, Ms. Carias co-authored a Historic Properties Inventory and Evaluation Report for the Sycuan Band of the Kumeyaay Nation Reservation (Sycuan) for the proposed Sycuan Fee to Trust Project (Project), located on the within the vicinity of El Cajon, California in unincorporated San Diego County.

The Project proposes a fee-to-trust transfer of five (5) parcels that cumulatively total approximately 40 acres. The transfer of land from Sycuan to the Bureau of Indian Affairs (BIA), the federal lead agency.

Responsibilities for the project included: background research and authoring the cultural resources report. Prior to South Environmental, DUDEK
Department of Veterans Affairs, Sepulveda Ambulatory Care Center, Van Nuys, California.

Authored Finding of Effects report to satisfy Section 106. Project includes the demolition of 12 buildings located on a campus that has been determined ineligible as a historic district by the California Office of Historic Preservation. Prior to South Environmental, Chattel, Inc.

Second Church of Christ, Scientist, Historic Structure Report, Long Beach, California. Complied a Historic Structure Report to assist current owner in obtaining much needed funds for rehabilitation of 1914 church with extensive water damage. Prior to South Environmental, Chattel, Inc.

Sears Boyle Heights, Los Angeles, Federal Investment Tax Credit, Los Angeles, California.

Submitted and received conditional approvals on Part II Federal Investment Tax Credit application for former Sears, Roebuck and Company retail store and warehouse in Boyle Heights. Participated in design collaboration on rehabilitation of subject property as a mixed-use property with retail, creative office, and residential space. Prior to South Environmental, Chattel, Inc.

San Juan Capistrano Substation, Historic American Engineering Record (HAER), San Juan Capistrano, California. Prepared and submitted HAER documentation to the Library of Congress for the Southern California Edison Company Capistrano Substation as mitigation compliance as part of system upgrades. Providing construction monitoring of the rehabilitation of former utility structure located on San Diego Gas & Electric Company substation as part of a mitigation measure. Conducts bimonthly site visits, provides design consultation, and monthly observation reports. Prior to South Environmental, Chattel, Inc.

Email: [email protected]
Mobile: 818-458-1162

EDUCATION
M.A., Anthropology,
California State University,
Los Angeles, 2013
B.A., Anthropology,
California State University,
Northridge, 2003

PROFESSIONAL

AFFILIATIONS
California Preservation
Foundation
Society of Architectural
Historians
National Trust for Historic
Preservation

PROFESSIONAL

EXPERIENCE
Dudek (2014-2021),
Historic Built Environment
Lead
SWCA Environmental
Consultants (2008-2014),
Senior Architectural
Historian/ Cultural Resources
Project Manager
BonTerra Consulting (2006-
2008), Project Assistant
Samantha Murray, MA

PRINCIPAL ARCHITECTURAL HISTORIAN
Samantha Murray is the cultural resources director at South Environmental and a senior architectural historian with over 15 years’ experience in all elements of cultural resources management, including project management, architectural history studies, and historical significance evaluations in consideration of the National Register of Historic Places (NRHP), California Register of Historical Resources (CRHR), and local-level designation criteria.

Ms. Murray has conducted hundreds of historical resource evaluations and developed detailed historic context statements for a multitude of property types and architectural styles. She has also provided expertise on numerous projects requiring conformance with the Secretary of the Interior’s Standards for the Treatment of Historic Properties.

Ms. Murray meets the Secretary of the Interior’s Professional Qualification Standards for both Architectural History and Archaeology. She is experienced managing multidisciplinary projects in the lines of private development, transportation, transmission and generation, federal land management, land development, and state and local government. She is an expert in preparation of cultural resources compliance documentation for projects that fall under the California Environmental Quality Act (CEQA), National Environmental Policy Act (NEPA), and Sections 106 and 110 of the National Historic Preservation Act (NHPA). Ms. Murray has also served as an expert witness in legal proceedings concerning historical resources under CEQA and local ordinance protection.

EXPERTISE
• CEQA, NEPA, and Section 106 of the NHPA compliance
documentation in consideration of impacts to historical, archaeological, and tribal cultural resources, and historic properties • Historic resource significance evaluations in consideration of NRHP, CRHR, and local designation criteria.
• Project design review for conformance with the Secretary of the Interior’s Standards.
• Preparation of archival documentation for HABS/HAER/HALS. • Assistance with complex mitigation including salvage and interpretive displays.
• Peer review.

Samantha Murray, MA Resume, Page 2

SELECT PROJECT EXPERIENCE
Historic Built Environment Assessment for the CA3-2590 Walsh Avenue Project, City of Santa Clara, California (2021). South Environmental was retained by FirstCarbon Solutions to prepare a historic built environment assessment report for the City of Santa Clara in support of the CA3-2590 Walsh Avenue Project. Two built environment resources over 45 years old were identified within the project study area: the Uranium Substation and an unrecorded segment of the larger Southern Pacific Commute Service Line (P-43-000928). These resources were recorded and evaluated for historical significance in consideration of CRHR and City designation criteria and integrity requirements. Both resources were found not eligible under all designation criteria. The proposed project was found to have a less than significant impact on historical resources under CEQA.

Historic Built Environment Assessment for the Solid Waste and Recycling Transfer Station Replacement Project, City of Berkeley, California (2021). South Environmental was retained by FirstCarbon Solutions to prepare a historic built environment assessment report for the City of Berkeley in support of the Solid Waste and Recycling Transfer Station Replacement Project. One built environment resource over 40 years old was identified within the project study site: City of Berkeley Solid Waste Transfer Station and Recycling Center. The entire property was recorded and evaluated for historical significance in consideration of CRHR and City Landmark and Structure of Merit designation criteria and integrity requirements. The property was found not eligible under all designation criteria due to a lack of significant historical associations and integrity. The proposed project was found to have a less than significant impact on historical resources under CEQA.

Gilroy Citywide Historic Resource Inventory, City of Gilroy, Santa Clara County, California (2020).

While working for her previous firm, Ms. Murray served as Project Manager, Principal Architectural Historian, co-author of the historic context statement, public outreach, and presented at all public hearings. The City of Gilroy Historic Context Statement and Historic Resources Inventory (HRI) update project was undertaken by the City’s Community Development Department to enhance and streamline the City’s historic preservation program by bringing consistency to preservation planning efforts. This document presents the history of the City of Gilroy’s built environment from pre-history to present, identifies important themes, events, patterns of development, and describes the different property types, styles, builders, and architects associated with these important periods and themes; and also develops registration requirements for resource evaluation that is specific to the City of Gilroy, in consideration of both historical significance and integrity requirements. The project included pedestrian survey of 3,374 properties within the City of Gilroy built in 1974 or earlier. The historical significance and integrity of properties within the survey area was evaluated in consideration of NRHP, CRHR, and City designation criteria, as well as the seven aspects of integrity.

Addendum to the University of California, Berkeley 2020 Long Range Development Plan Environmental Impact Report for the Levine-Fricke Softball Field Improvements Project, California (2020). While working for her previous firm, Ms. Murray served as Principal Architectural Historian and author of memorandum. The project would replace existing facilities at Levine-Fricke Field, east of the U.C. Berkeley campus, including seating bleachers, access ramps, stairs, fences, and restroom facilities, and the majority of the existing surface parking. The Project would then result in construction of an upgraded NCAA-compliant softball field and a two-story structure including the concourse, fixed seating capacity for 1,500 spectators, and the press box. Ms. Murray prepared a detailed memorandum that presents an historical resources impacts analysis for the project that specifically addresses potential impacts to the adjacent NRHP-listed Panoramic Hill Historic District.

Samantha Murray, MA Resume, Page 3
Historic Resource Evaluation Report for 201 Georgia Street, City of Vallejo, Solano County, California (2020). While working for her previous firm, Ms. Murray served as Principal Architectural Historian, co-author, and QA/QC of work products. California State University Maritime Academy (Cal Maritime) required a historical resources evaluation report for a two-story, commercial building located at 201 Georgia Street, in the City of Vallejo, California, prior to purchasing the building. The report included conducting a BERD record search, fieldwork, archival research, historical context development, developing building descriptions, and evaluation of a vacant commercial office building. The building was found ineligible for listing in the NRHP, CRHR, or as a locally significant resource, due to a lack of significant historical associations or architectural merit.

California State University (CSU), Chico Master Plan EIR, City of Chico, Butte County, California (2020). While working for her previous firm, Ms. Murray served as Principal Architectural Historian and QA/QC of the final cultural report. The CSU Chico Master Plan is intended to update the most recent master planning document for CSU Chico from 2005, by planning for student enrollment, faculty and staff expansions, update campus facilities, emphasize open spaces, landscapes, and walkability, and promote student life experience. Additionally the new master plan will provide for the CSU Chico College of Agriculture to provide leadership, basic and applied research opportunities, and a positive work environment for employees and students. The cultural resources study included a records search of the proposed project site plus a 0.5-mile radius; a pedestrian survey of the project site; archival and building development research for buildings located within the project site; evaluation of buildings for the NRHP, CRHR, California Historical Landmark (CHL), and local eligibility criteria and integrity requirements; and an assessment of impacts to historical resources in compliance with CEQA and PRC Sections 5024 and 5024.5 for state-owned resources.

San Francisco State University Master Plan EIR, California (2019). While working for her previous firm, Ms. Murray served as Principal Architectural Historian and provided QA/QC of the final technical report. San Francisco State University (SFSU) Capital Planning, Design, and Construction required a historic built environment study for the proposed SFSU Master Plan Update (project) environmental impact report (EIR). Only buildings more than 45 years of age and proposed for renovation or demolition were included in this historic built environment study for the proposed project. The historic built environment resources study includes the following components: (1) a CHRIS records search covering the proposed project site plus a 0.5-mile radius; (2) a pedestrian survey of the project site for built environment resource; (3) archival and building development research for buildings located within the project site; (4) the evaluation of buildings for the NRHP; CRHR, CHL, and local eligibility criteria and integrity requirements; and (5) consideration of impacts to historical resources in compliance with the CEQA and PRC Sections 5024 and 5024.5 for state-owned resources.

Trail to Crane Creek Project, City of Rohnert Park, Sonoma County, California (2019). While working for her previous firm, Ms. Murray served as Principal Architectural Historian, co-author, and QA/QC of final work products. The City of Rohnert Park required an historical resources evaluation for the proposed Trail to Crane Creek Regional Park Project, Rohnert Park, California. The Himebauch Wall (P-49-004917) was recommended eligible for listing under NRHP and CRHR Criteria A/1 and C/3, and County of Sonoma Designation Criteria A and C. In addition, the Himebauch Ranch site (P-49-003055) was previously found eligible under NRHP/CRHR Criterion A/1. To ensure that these resources will not be inadvertently damaged or impaired as part of the proposed project, Ms. Murray completed a review of all applicable project elements for conformance with the Secretary of the Interior’s Standards for Rehabilitation. As a result of this conformance review, all elements of the proposed project were found to be in conformance with the Rehabilitation Standards and Guidelines, and all potential project-related impacts to historical resources were found to be less than significant.

Samantha Murray, MA Resume, Page 4
San Francisco State University (SFSU) Romberg Tiburon Center (RTC) Campus Buildings, California (2018). While working for her previous firm, Ms. Murray served as Principal Architectural Historian and primary author. SFSU required a review of proposed design plans for new construction on Buildings 49 & 50 of the RTC, located at 3150-3152 Paradise Drive on the Tiburon Peninsula in Marin County, California. Because these buildings were identified as contributors to a cultural landscape and as individually eligible buildings, they required design review for conformance with the Secretary of the Interior’s Standards for the Treatment of Historic Properties, specifically the Standards for Rehabilitation, in order to minimize impacts to historical resources under CEQA. The entire 36-acre RTC property was found eligible for the NRHP and CRHR as a cultural landscape known as the U.S. Navy Fuel Depot and Net Depot Cultural Landscape. Subsequent design plans to rehabilitate the buildings and make them ADA accessible were reviewed by Ms. Murray and a conformance review memo was prepared. Working with the architect and SFSU, the design plans were found to be in conformance with the Standards for Rehabilitation.

Historical Evaluation of 3877 El Camino Real, City of Palo Alto, Santa Clara County, California (2017). While working for her previous firm, Ms. Murray served as Principal Architectural Historian, author or report. After providing a peer review of another consultant’s evaluation, the City asked Ms.

Murray to re-do the original evaluation report. As part of this work she conducted additional archival research on the property and evaluated the building for historical significance in consideration of local, state, and national designation criteria and integrity requirements. The project proposed to demolish the existing building and develop new housing.

PROFESSIONAL PRESENTATIONS
Historical Resources and CEQA: An Overview of Identification, Evaluation, Impacts Assessment, and Mitigation. Prepared for the Gilroy Historic Heritage Committee. Presented by Samantha Murray, Dudek. May 15, 2019. Delivered a 1.5-hour PowerPoint presentation to the City of Gilroy’s Historic Heritage Committee during one of their monthly public hearings. The presentation provided an overview of the CEQA process, how historical resources are treated under CEQA, as well as the process for identification, evaluation, impacts assessment, and options to consider for mitigation. The presentation also included examples from CEQA Case Law and included an extensive question and answer session with the audience.

Historical Resources under CEQA. Prepared for the Orange County Historic Preservation Planner Working Group. Presented by Samantha Murray, Dudek. December 1, 2016. Delivered a 1-hour PowerPoint presentation to the Orange County Historic Preservation Planner Working Group, which included planners from different municipalities in Orange County, regarding the treatment of historical resources under CEQA. Topics of discussion included identification of historical resources, assessing impacts, avoiding or mitigating impacts, overcoming the challenges associated with impacts to historical resources, and developing effective preservation alternatives.

Knowing What You’re Asking For: Evaluation of Historic Resources. Prepared for Lorman Education Services. Presented by Samantha Murray and Stephanie Standerfer, Dudek. September 19, 2014. With Ms. Standerfer, delivered a one-hour PowerPoint presentation to paying workshop attendees from various cities and counties in Southern California. The workshop focused on outlining the basics of historical resources under CEQA and delved into issues/challenges frequently encountered on preservation projects.

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City of Hercules–Skelly Residential Project
Initial Study/Mitigated Negative Declaration
FirstCarbon Solutions
Geology and Soils Supporting Information

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City of Hercules–Skelly Residential Project
Initial Study/Mitigated Negative Declaration
FirstCarbon Solutions
D.1 - Geotechnical Investigation

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GEOTECHNICAL INVESTIGATION
On

PROPOSED RESIDENTIAL DEVELOPMENT
At
215 Skelly
Hercules, California
For
D.R. Horton

By
Quantum Geotechnical, Inc.

Project No. G025.G
November 11, 2021
6288 San Ignacio Avenue, Suite A, San Jose, CA 95119 Phone (408)-629-3822, Facsimile (408) 629-3825 1110 Burnett Avenue, Suite B, Concord, CA 94520 Phone: (925) 788-2751 QUANTUM GEOTECHNICAL, INC.

Project No. G025.G
November 11, 2021
Mr. Adam Foster
Forward Planner
D.R. Horton
6683 Owens Drive
Pleasanton, CA 94588
Subject: Proposed Residential Development
215 Skelly
Hercules, California

GEOTECHNICAL INVESTIGATION
Dear Mr. Foster
In accordance with your authorization, Quantum Geotechnical, Inc., has investigated the geotechnical conditions at the subject site located in Hercules, California The accompanying report presents the results of our field investigation. Our findings indicate that development of the site for the proposed development is feasible provided the recommendations of this report are carefully followed and are incorporated into the project plans and specifications.

Should you have any questions relating to the contents of this report or should additional information be required, please contact our office at your convenience.

Sincerely,
Quantum Geotechnical, Inc.

Simon Makdessi, P.E., G.E.

President

TABLE OF CONTENTS

LETTER OF TRANSMITTAL

GEOTECHNICAL INVESTIGATION
Purpose and Scope ...............................................................................................................4 Proposed Development ........................................................................................................4 Site Location and Description ..............................................................................................4 General Geologic Conditions ...............................................................................................5 Investigation ........................................................................................................................6 Subsurface Conditions ........................................................................................................7 Liquefaction Potential Evaluation .......................................................................................7 2019 CBC Seismic Design Criteria ....................................................................................8

DISCUSSION, CONCLUSIONS AND RECOMMENDATIONS
General .................................................................................................................................9 Demolition .........................................................................................................................10 Grading ..............................................................................................................................11 Surface and Subsurface Drainage ......................................................................................12 Bio-Filtration Areas ...........................................................................................................13 Foundations ........................................................................................................................14 Post-Tensioned Slab-On-Grade ...................................................................................14 General Construction Requirements for Post-Tensioned Slab-On-Grade ...................15 Miscellaneous Concrete Flatwork ......................................................................................17 Retaining Walls………………………………………………………………… ..............17 Retaining Wall/Soundwall Foundations - Spread Footings ...............................................19 Retaining Wall/Soundwall Foundations- Pier Footings ....................................................19 Pavement Areas .................................................................................................................20 Utility Trenches .................................................................................................................21 Project Review and Construction Monitoring ...................................................................21 REFERENCES ..............................................................................................................................23 LIMITATIONS AND UNIFORMITY OF CONDITIONS ..........................................................24

APPENDIX A
Figure 1, Site Vicinity and Fault Map ...............................................................................26 Figure 2, Regional Geologic Map ......................................................................................27 Figure 3, Site Plan ..............................................................................................................28 Figure 4, Logs of Test Borings B-1 to B-4 ........................................................................28 Key to Boring Logs ............................................................................................................34

APPENDIX B
Laboratory Investigation ....................................................................................................36 Summary of Laboratory Test Results, Table B-1 ..............................................................37

APPENDIX C
The Grading Specifications ................................................................................................39 Guide Specifications for Rock Under Floor Slabs .............................................................44

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 4 of 44

GEOTECHNICAL INVESTIGATION

PURPOSE AND SCOPE
The purpose of the investigation for the proposed new residential development located at 215 Skelly, Hercules in California was to determine the surface and subsurface soil conditions at the subject site. Based on the results of the investigation, criteria were established for the grading of the site, the design of foundations for the proposed development, and the construction of other related facilities on the property.

Our investigation included the following:
a. Field reconnaissance by the Soil Engineer;
b. Determine the general seismicity of the site in accordance with the 2019 CBC; c. Excavation and logging of four exploratory soil borings; c. Laboratory testing of soil samples;
d. Analysis of the data and formulation of conclusions and recommendations; and e. Preparation of this written report.

PROPOSED DEVELOPMENT
It is our understanding that the proposed project consists of developing the site for the construction of a new residential subdivision consisting of 39 single family residence lots. Based on a review of a Conceptual Grading and Utility Plan by CBG dated June 2020, grading will consist of cuts up to 13 feet deep and fills up to 5 feet thick. Several retaining walls 2 to 3 feet high are planned between lots and site retaining walls up to 5 feet high are planned along the rear property line for the northern lots. The residence structures are planned to be supported on a post-tensioned slab foundation system.

SITE LOCATION AND DESCRIPTION
The site is located in the western part of Hercules, north of Highway 4 and east of Pinole Creek.

The terrain surrounding the site is comprised of moderate rolling hills. The site is roughly rectangular shaped and measures approximately 7.3 acres in size. The lot currently hosts multiple building such as residences, shed structures, stables, and a large metal clad shed that appear to be abandoned relics of the site’s previous use as a farm. Various pieces of mechanical equipment, a large tank, miscellaneous furniture, and piles of mulch, wood debris and construction debris are Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 5 of 44
strewn throughout the site The ground cover onsite consists of grass to waist high vegetation, various large and small trees and shrubs, and degraded asphaltic concrete and gravel driveways.

There appears to be a couple of local graded areas where fills up to 5 feet high have been placed.

Along the majority of the eastern part of the site (lots 1-4), a cut slope exists down to the entrance driveway. The upper 4 to 5 feet of the cut slope is near vertical and exposes siltstone/sandstone bedrock from the near surface.

GENERAL GEOLOGIC CONDITIONS
The site is located within the Coast Ranges Geomorphic Province of California. Throughout the Cenozoic Era, the western part of California has been affected by tectonic forces associated with lateral or transform plate motion between the North American and Pacific crustal plates, which has produced a complex system of northwest-trending faults - the San Andreas, Hayward, and Calaveras Fault systems being the most prominent within the Bay Area. Uplift, erosion and subsequent re-deposition of sedimentary rocks within this province have been driven primarily by the northwest-southeast directed strike-slip movement of the tectonic plates and the associated northeast oriented compressional stress. The northwest-trending coastal mountain ranges are the result of an orogeny believed to have been occurring since the Pleistocene epoch (approximately 2-3 million years before present).

The site resides in the alluvial flatlands surrounding the Pinole Creek channel. According to the geologic map of Graymer et al. (1994), the site is underlain by undivided quaternary deposits, and may be partially underlain by bedrock of Hambre Sandstone on the eastern portion. Site and regional geology are displayed in the “Regional Geologic Map”, Figure 2, Appendix A. The bedrock exposures along the eastern part of the site confirms the geologic mapping.

The California Geologic Survey has published a seismic hazard map for the Mare Island 7.5-minute quadrangle which includes the site area. This map excludes the site from zones of required mitigation for land sliding, fault, and liquefaction hazards. There is no nearby data in the CA Water Resource Library to indicate near site groundwater level, but it is anticipated to be moderate, within the top 30 feet, due to the site proximity to the northern San Francisco Bay. The Association of Bay Area Governments has published an interactive map of liquefaction susceptibility within the bay area. This mapping indicates that the site has a low to moderate susceptibility to liquefaction.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 6 of 44
The USGS Quaternary Fault database provides a record of quaternary active fault traces, defined as exhibiting seismicity within the last 1.6 million years based on historic mapping and observations. Faults can act as preliminary sources of seismically induced ground shaking, and can also act as co-seismic sources of shaking induced by nearby faults even after seismic activity has ceased. A list of Quaternary active fault traces within 10 miles of the site is provided in Table I below. Fault traces within the vicinity of the site are as indicated on Figure 1, “Site Vicinity and Fault Map”, attached to Appendix A.

Table I
List of Holocene Faults

INVESTIGATION
The field investigation was performed on August 03, 2020, and included a reconnaissance of the site and the drilling of four exploratory borings, at the locations shown on Figure 3, “Site Plan” attached to Appendix A.

The borings were drilled to depths ranging from 20 to 45 feet below the existing grade. The drilling was performed with a truck-mounted mobile B-40 drill rig utilizing 8 inch diameter hollow stem augers. Visual classifications were made from cuttings and the samples in the field. As the drilling proceeded, disturbed soil samples were obtained by means of a 2.0 inch O.D. split-spoon sampler.

The sampler was driven into the in-situ soil under the impact of a 140-pound hammer undergoing a free fall of 30 inches. The number of blows required to advance the sampler 12 inches into the soil is reported on the boring logs. The samples were sealed and returned to the laboratory for testing. Classifications made in the field were verified in the laboratory after further examination Fault ID Distance from
Site (mi) USGS Activity Level (yrs)
Pinole 0.3 < 1.6 mya
Moraga 2.4 < 1.6 mya
Hayward 3.8 < 150 ya
Franklin 4.1 < 1.6 mya
Southampton 6.5 < 1.6 mya
Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 7 of 44
and testing. The stratification of the soils, descriptions, location of undisturbed soil samples and blow counts are shown on the respective "Logs of Test Borings" contained within Appendix A.

Laboratory testing was conducted for moisture content, Atterberg Limits, sieve analysis, and corrosion potential. The laboratory test results are presented on the boring logs, and summarized in Appendix B.

SUBSURFACE CONDITIONS
The subsurface conditions varied between the borings. Boring B-1 encountered 8 feet of very stiff to hard silt and underlain by stiff and very stiff silty clay to the maximum depth explored of 45 feet. In boring B-2, the surficial 8 foot silty clay layer is underlain medium dense and dense clayey to poorly-graded sand to 16 foot depth, where very stiff silty clay was encountered to the maximum depth explored of 20 feet. In borings B-3 and B-4 on the eastern portion of the site, a surface layer of stiff and hard, silty clay ranging in depth from 5 to 7 feet, and underlain by dense, well cemented residual soil, and weathered sandstone to siltstone bedrock to the maximum depth explored of 25 feet.

Groundwater was encountered in borings B-1 and B-2 at depths 11 and 13 feet, respectively, at the time of our investigation. Groundwater was not encountered in the borings on the eastern portion of the site property. Groundwater elevation may fluctuate based on seasonality, nearby development activities, and urbanization, among other factors.

A more thorough description and stratification of the soil conditions are presented on the respective, “Logs of Test Borings” in Appendix A. The approximate locations of the borings are shown on Figure 3, “Site Plan” Appendix A.

LIQUEFACTION POTENTIAL EVALUATION
Liquefaction occurs primarily in relatively loose, saturated, cohesionless soils. Under earthquake stresses, these soils become “quick”, lose their strength and become incapable of supporting the weight of the overlying soils or structures. The data used for evaluating liquefaction potential of the subsurface soils consisted of the penetration resistance, the soil gradation, the relative density of the materials, and the groundwater level. For the purpose of our evaluation, we have assumed a design groundwater table of 15 foot depth.

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Loose to medium dense cohesionless soil such as sands and some silts and low plasticity clays are potentially liquefiable, while dense and very dense cohesionless sands and gravels are considered to have a very low potential for liquefaction. All materials encountered in the borings were at least very stiff and dense, and therefore the potential for liquefaction or dynamic compaction is considered nil.
2019 CBC SEISMIC DESIGN CRITERIA
The potential damaging effects of regional earthquake activity should be considered in the design of structures. As a minimum, seismic design should be in accordance with Chapter 16 of the 2019 California Building Code (CBC). The 2019 CBC utilizes the design procedures outlined in the ASCE 7-16 Standard.

Using the criteria in Chapter 20 of ASCE 7-16, in its current condition, the site is classified as Site Class D. As a result, no site response analysis is required. The seismic design parameters have been developed using the online “Seismic Design Maps” tool (5) by the Structural Engineering Association (SEA) and Office of Statewide Health Planning and Development (OSHPD) and a site location based on longitude and latitude. The parameters generated for the subject site for a latitude of 38.00867° N, and longitude of 122.2891° W, are presented in the following Table II:

Table II
2019 CBC Seismic Design Criteria
Seismic Parameter Coefficient Value
Site Class – Stiff Soil D
Peak Ground Acceleration (Site Modified) PGAM 0.872
Mapped MCE Spectral Acceleration at Short-Period 0.2 secs Ss 1.891 Mapped MCE Spectral Acceleration at a Period of 1.0s S1 0.715 Adjusted MCE, 5% Damped Spectral Response
Acceleration at Short Period of 0.2s SMS 1.891
Adjusted MCE, 5% Damped Spectral Response
Acceleration at Period of 1.0s SM1 1.216
Design 5% Damped Spectral Response Acceleration at
Short Period of 0.2s for Occupancy Category I/II/III SDS 1.260 Design 5% Damped Spectral Response Acceleration at
Period of 1.0s for Occupancy Category I/II/III SD1 0.810

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DISCUSSIONS, CONCLUSIONS AND RECOMMENDATIONS

GENERAL

1. From a geotechnical point of view, the site is suitable for the construction of the proposed residential development provided the recommendations presented in this report are incorporated into the project plans and specifications.

2. The most prominent geotechnical features of this site are; a) The possible presence of old fill, septic tanks and leach fields and irrigation line(s) b) the presence of moderately expansive near surface clay soil c) and presence of shallow bedrock along the eastern side of the site.

3. Based on our site reconnaissance, the site will contain localized areas of old fill as evidenced from surface topographic features. It is also likely that some localized areas of old fill may be present within the improved areas and possibly in the open areas from unknown past site activities. In addition, the old residence structures may have been served by septic systems and leach fields. We recommend that during the final stages of demolition, a number of test holes be excavated throughout the site to evaluate the presence and extent of any non-engineered fill, and to chase sewer pipes from the existing residences to evaluate if a septic tank is present. If encountered, it is recommended the old fill be removed and replaced as engineered fill. The sub-excavated material is may be suitable for reuse as fill as approved by the soil engineer.

4. Atterberg Limits testing on the surficial clay registered Plasticity Index (PI) values of 13, 20 and 29 indicating the material to be moderately and highly expansive. The moderately and highly expansive soil is prone to heave and shrink movements with changes in moisture content and must be carefully considered in the design and construction of foundations, drainage, hardscape and pavements. A post-tensioned slab foundation is the most appropriate foundation system for the proposed structures.

5. Based on a review of the conceptual grading plan, cuts ranging from 1 to 13 feet are anticipated in the south eastern area of the site where bedrock is present near surface. Based on the exposed cuts along the east side and the ease of drilling, the bedrock is assessed to be rippable with Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 10 of 44
standard earthwork equipment for mass grading activities, and excavator equipment for trenching activities.

DEMOLITION

6. Prior to any grading, demolition of the existing structures on the site should be completed.

Demolition should include the complete removal of all surface and subsurface structures. In addition, all known underground structures must be located on the grading plans so that proper removal may be carried out, and all excavations are left open for proper backfilling. It is vital that Quantum Geotechnical Inc., intermittently observe the removal of subsurface structures and excavations, and be notified in ample time to ensure that no subsurface structures or excavations are covered. If Quantum Geotechnical Inc., is not contacted to observe the demolition and removal of subsurface structures, further backhoe exploratory investigation will need to be performed prior to the commencement of grading.

7. Excavations made by the removal of the structures may create disturbed/loose areas, and where this occurs the loose material should be excavated and replaced as engineered fill, or if it is less than 1 foot in thickness, can be compacted in place, prior to placing fill. We recommend that excavations greater than 1 foot deep be left open by the demolition contractor for backfill in accordance with the requirements for engineered fill. The removal of underground structures should be done under the observation of the Soil Engineer to verify adequacy of the removal and that subsoils are left in proper condition for placement as engineered fills. Any soil exposed by the removal operations which are deemed soft or unsuitable by the Soil Engineer, shall be excavated as uncompacted fill and be removed as required by the Soil Engineer during grading. Any resulting excavations should be properly backfilled with engineered fill under the observation of the Soil Engineer. It is important that Quantum Geotechnical Inc., be present during removal activities to verify that all excavations created by removal of subsurface structures are left open and located on a grading plan. If any excavations are loosely backfilled without our knowledge and these excavations are not located and backfilled during grading, future settlement of these loosely filled excavations could occur and may cause damage to structures and improvements.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 11 of 44

GRADING

8. The grading requirements presented herein are an integral part of the grading specifications presented in Appendix C of this report and should be considered as such.

9. Grading activities during the rainy season on cohesive soils will be hampered by excessive moisture. Grading activities may be performed during the rainy season, however, achieving proper compaction may be difficult due to excessive moisture; and delays may occur. In addition, measures to control potential erosion may need to be provided. Grading performed during the dry months will minimize the occurrence of the above problems.

10. The site contains much vegetation cover and stripping of vegetation and topsoil will be required. Vegetation conditions may be different at the time of grading, and the extent of any stripping will be revaluated at that time. Organically contaminated soil material or strippings may be utilized in landscape areas located outside the building footprint.

11. Demolition of the existing structures and grubbing of trees may create disturbed/loose areas, and where this occurs the loose material should be excavated and replaced as engineered fill or if it is less than 1 foot in thickness, compacted in place, prior to placing fill. In addition, removal of portions of the existing pavements will be performed. The removed concrete, asphaltic concrete and aggregate base can be reused as fill provided the concrete and AC is broken down to pieces less than 6 inches in size and thoroughly mixed with soil material, however, we recommend that AC not be used in the upper 2 feet of soil in landscape areas as the AC may affect plant growth.

12. Following the removal of any strippings, old fill or loose fill, the top 8 inches of exposed native ground should be scarified and compacted to a minimum degree of relative compaction of 90% at 2 to 3 percent above optimum moisture content as determined by ASTM D1557-12 Laboratory Test Procedure. After recompacting the subgrade, the site may be brought to the desired finished grades by placing engineered fill in lifts of 8 inches in uncompacted thickness and compacting to a relative compaction of at least 90%, at 2 to 3 percent above optimum moisture content.

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13. Based on a review of the preliminary grading plan, differential fill thickness across a building pad are generally of the order of 1 to 4 feet. Differential fill thicknesses less than 7 feet do not require mitigation by sub-excavation.

14. Based on a review of the conceptual grading plan, several lots will be graded such that the building pad will be created by cut and fill. The depth of cut ranges from 0 to 13 feet and the depth of fill within these pads is generally up to 4 feet. For these lots, we recommend that the cut portion of the pad be sub-excavated to a depth of 2 feet, and the excavation be backfilled with the subexcavated material as engineered fill. If the base of the sub-excavation is found to be dry, we recommend that the base be ripped moisture conditioned and recompacted in place to the requirements of engineered fill.

15. The finish grade cut portion of lots at the eastern side and some on the south eastern corner may possibly comprise sandstone/siltstone bedrock. It may be difficult to promote landscape growth on bedrock material and make trenching for irrigation lines difficult. For such situations, we recommend that the entire pad be sub-excavated a depth of 2 feet and backfilled as engineered fill

16. All soils encountered during our investigation are suitable for use as engineered fill when placed and compacted at the recommended moisture content and provided it does not contain any debris.

SURFACE AND SUBSURFACE DRAINAGE

17. All finish grades should be provided with a positive gradient to an adequate discharge point in order to provide rapid removal of surface water runoff away from all foundations. No ponding of water should be allowed on the pad or adjacent to the foundations. Surface drainage must be designed by the project Civil Engineer and maintained by the property owners at all times. The pad should be graded in a manner that surface flow is to a controlled discharge system.

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18. Lot slopes and drainage must be provided by the project Civil Engineer to remove all storm water from the pad and to minimize storm and/or irrigation water from seeping beneath the structures. Should surface water be allowed to seep under the structure, foundation movement resulting in structural cracking and damage will occur. Finished grades around the perimeter of the structure should be compacted and should be sloped at a minimum 2% gradient away from the exterior foundation. Surface drainage requirements constructed by the builder should be maintained during landscaping. In particular, the creation of planter areas confined on all sides by concrete walkways or decks and the residence foundation is not desirable since any surface water due to rain or irrigation becomes trapped in the planter area with no outlet. If such a landscape feature is necessary, surface area drains in the planter area or a subdrain along the foundation perimeter must be installed.

BIO-FILTRATION FACILITIES

19. According to local government requirements, roof downspout and drain flows should be directed to at grade bio-filtration areas, or raised planter boxes next to the building perimeter, where possible. From a geotechnical and maintenance point of view it is undesirable to discharge water into at grade bio-filtration areas near foundations, because of the possibility of water ponding for sustained periods of time, potentially creating excessive moisture related issues. However, certain design features could be made to minimize such potential effects. In addition, the property owners must always maintain the bio-filtration area to ensure that they are performing as designed and that water does not pond in the area for longer than 48 hours.

20. Typically, the bio-filtration areas consist of an 18 inch layer of sandy loam over 18 inches of permeable gravel material. The top of the bio-filtration area is typically approximately 1 foot below pad grade, therefore, the base of the bio-filtration area will be approximately 4 feet below pad grade. The base of the bio-filtration area will typically contain a perforated pipe to drain any water that may collect within 24 hours. In some situations, the bio-filtration areas may be located immediately adjacent the building structure.

21. Where bio-filtration areas are located closer than 5 feet of the building, the section of loose loam and gravel will provide reduced lateral support, and we recommend a deepened footing be constructed along the perimeter the building adjacent to the bio-filtration area and extending 3 feet Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 14 of 44
beyond in plan length. The depth of the deepened footing will depend on how close the biofiltration area is located to the building perimeter. As a guide, the footing is to be deepened such that when an imaginary line inclined at 45 degrees from the outside edge base of the footings, it extends below the base of the bio-filtration area excavation. Where bio-filtration areas are located further than 5 feet, no special design is required. Provided the bio-filtration facility is lined with an impermeable liner, no waterproofing of the deepened footing is required.

22. Where bio-filtration areas are located closer than 3 feet of street pavements, a deepened curb footing is required. Where bio-filtration areas are located closer than 1 foot of street pavements, because pavements do not have a positive connection to a deepened curb/footing, the deepened curb/footing may need to be designed as a retaining wall rigid enough to create minimal lateral deflections.

23. Where bio-filtration areas are located closer than 2 feet of hardscape areas, a deepened edge footing is required. The deepened edge should extend at least 1 foot below the subgrade.

Where the bio-filtration area is immediately adjacent the hardscape, the deepened edge is to extend at least 3 inches below the base of the bio-filtration system.

FOUNDATIONS

24. Provided the site is prepared as recommended in the “Grading” section, a post-tensioned slab foundation may be satisfactorily used. The slab must be designed to tolerate the expansive clay criteria presented in this section.

Post Tensioned Slab-on-Grade

25. Post-tensioned slabs should be designed using the following criteria which is based on the design method presented in the Post-Tensioning Institute, Standard Requirements for Design and Analysis of Shallow Post-Tensioned Concrete Foundations on Expansive Soils (PTI DC10.5-12), 2012. Using the relevant site soil and climatic parameters, the recommended geotechnical criteria for use in the design of the post-tensioned slabs is as follows; Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 15 of 44
Swelling Mode
Center Lift Edge Lift
Edge Moisture Variation Distance (em) 8.9 feet 4.6
Differential Soil Movement (ym) 0.70 inches 1.19 inches

26. The maximum allowable bearing pressure at the base of the slab and for localized thickened footings should not exceed 2,000 p.s.f. for dead plus sustained live loads.

27. As indicated earlier, bio-filtration areas may be designed close to the foundation. Where bio-filtration areas are located closer than 5 feet of the building, the section of loose loam and gravel, will provide reduced lateral support, and we recommend a deepened footing be constructed along the perimeter the building adjacent to the bio-filtration area and extending 3 feet beyond in plan length. The depth of the deepened footing will depend on how close the bio-filtration area to the building perimeter. As a guide, the footing is to be deepened such that when an imaginary line inclined at 45 degrees from the outside edge base of the footings, it extends below the base of the bio-filtration area excavation.

General Construction Requirements for Post Tensioned Slab-on-Grade

28. Prior to construction of the slab, the slab subgrade should be observed by the Soil Engineer to verify that all under-slab utility trenches greater than 18 inches in width have been properly backfilled and compacted, and that no loose or soft soils are present on the slab subgrade.

29. Where the building pad consist of clayey soil, the slab subgrade should be soaked to saturation (minimum 5% above optimum) to a depth of 12 to 18 inches prior to placement of the capillary break or vapor retarder/barrier. This should be verified and approved by the Soil Engineer. The penetration of a thin metal probe to a depth of 10-12 inches generally indicates sufficient saturation.

30. The four (4) inch (minimum thickness) layer of gravel typically placed to provide a capillary break beneath concrete slab-on-grade floors may be omitted beneath the monolithically poured mat slab foundations provided that the slabs are at least 10 inches thick as recommended above. If it is desired to use a 4 inch layer or thinner of gravel section, the gravel should consist of broken stone, crushed or uncrushed gravel, quarry waste, or a combination thereof. The aggregate shall be free from deleterious substances. It shall be of such quality that the absorption of water in a saturated Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 16 of 44
dry condition does not exceed 3% of the oven dry weight of the sample. The material shall be ¾” minus material with no more than 3% passing the #200 sieve, as specified in Appendix C.

31. A moisture vapor retarder/barrier is recommended beneath all slabs-on-grade that will be covered by moisture-sensitive flooring materials such as vinyl, linoleum, wood, carpet, rubber, rubber-backed carpet, tile, impermeable floor coatings, adhesives, or where moisture-sensitive equipment, products, or environments will exist. We recommend that design and construction of the moisture vapor retarder/barrier conform to Section 1805 of the 2013 CBC and relevant sections of American Concrete Institute (ACI) guidance documents 302.1R-04, 302.2R-06 and 360R-10.

32. The moisture vapor retarder/barrier can be placed above the 4 inches of gravel or directly on the soil subgrade and should consist of a minimum 10 mils thick polyethylene with a maximum perm rating of 0.1 in accordance with ASTM E 1745. Seams in the moisture vapor retarder/barrier should be overlapped no less than 6 inches or in accordance with the manufacturer’s recommendations. Joints and penetrations should be sealed with the manufacturer’s recommended adhesives, pressure-sensitive tape, or both. The contractor must avoid damaging or puncturing the moisture vapor retarder/barrier and repair any punctures with additional polyethylene properly lapped and sealed. The installation of the vapor retarder membrane must be in conformance with ASTM E1643.

33. A minimum of two inches of wetted sand should be placed over the vapor retarder membrane to facilitate curing of the concrete and to act as a cushion to protect the membrane. The perimeter of the mat should be thickened to bear on the prepared building pad and to confine the sand. During winter construction, sand may become saturated due to rainy weather prior to pouring. Saturated sand is not desirable because the sand cushion may become over saturated, and boil into the concrete causing undesirable structural monopolies of sand pockets within the slab.

As an alternate, a sand-fine gravel mixture that is stable under saturated conditions may be used.

However, the material must be approved by the Soil Engineer prior to use.

34. Alternatively, the sand layer may be eliminated provided the concrete has a maximum water/cement ratio of 0.45 and a 10 mil Class A vapor retarder membrane, such as Stego® Wrap.

In any case, the vapor retarder/barrier should have a maximum perm rating of 0.3 in accordance with ASTM E 1745. Seams in the moisture vapor retarder/barrier should be overlapped no less Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 17 of 44
than 6 inches or in accordance with the manufacturer’s recommendations. Joints and penetrations should be sealed with the manufacturer’s recommended adhesives, pressure-sensitive tape, or both.

The contractor must avoid damaging or puncturing the vapor retarder/barrier and repair any punctures with additional polyethylene properly lapped and sealed.

35. It is our understanding that the preferred post-tensioned slab section is to consist of a slab with concrete having a water/cement ratio of no greater than 0.45, over a vapor retarder membrane underlain by soil subgrade. The sand and gravel sections that are sometimes typically used will not be utilized for this project. This is acceptable from a geotechnical point of view.

MISCELLANEOUS CONCRETE FLATWORK

36. Miscellaneous flatwork, driveways, and walkways may be designed with a minimum thickness of 4.0 inches. Any exterior concrete flatwork such as driveways, steps, patios, or walkways should be designed independently of the slab, and expansion joints should be provided between the flatwork and the structural unit. Control joints should be constructed to create squares or rectangles with a maximum spacing of 15 feet on large slab areas. Control joints for walkways should be constructed at a maximum of 5 feet spacing.

RETAINING WALLS

37. Retaining walls should be designed to resist lateral pressures exerted from a media having an equivalent fluid weight as follows:

Active Condition = 45 p.c.f. for horizontal backslope
At-rest Condition = 65 p.c.f.

Passive Condition = 250 p.c.f.

Coefficient of Friction = 0.30

38. For a non-horizontal backslope, the active condition equivalent fluid weight can be increased by 1.5 p.c.f. for each 2 degree rise in slope from the horizontal.

39. Active conditions occur when the top of the wall is free to move outward. At-rest conditions apply when the top of wall is restrained from any movement.

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40. It should be noted that the effects of any surcharge, traffic or compaction loads behind the walls must be accounted for in the design of the walls.

41. The above criteria are based on fully drained conditions. If drained conditions are not possible, then the hydrostatic pressure must be included in the design of the wall. An additional linear distribution of hydrostatic pressure of 63 p.c.f. should be adopted, in this case.

42. In order to achieve fully-drained conditions, a drainage filter blanket should be placed behind the wall. The blanket should be a minimum of 12 inches thick and should extend the full height of the wall to within 12 inches of the surface. If the excavated area behind the wall exceeds 12 inches, the entire excavated space behind the 12-inch blanket should consist of compacted engineered fill or blanket material. The drainage blanket material may consist of either granular crushed rock and drain pipe fully encapsulated in geotextile filter fabric or Class II permeable material that meets CalTrans Specification, Section 68, with drainage pipe but without fabric. A 4-inch perforated drain pipe should be installed in the bottom of the drainage blanket and should be underlain by at least 4 inches of filter type material. A 12-inch cap of clayey soil material should be placed over the drainage blanket. All back drains should be outlet to suitable drainage devices.

Retaining wall less than 3 feet in height may be provided with backdrains or weep holes.

43. As an alternate to the 12-inch drainage blanket, a pre-fabricated strip drain (such as Miradrain) may be used between the wall and retained soil. In this case, the wall must be designed to resist an additional lateral hydrostatic pressure of 30 p.c.f.

44. Piping with adequate gradient shall be provided to discharge water that collects behind the walls to an adequately controlled discharge system away from the structure foundation.

45. The retaining walls may be founded on a friction pier foundation or on spread footing foundations. Spread footing and pier design criteria are given below.

RETAINING WALL/SOUNDWALL FOUNDATION - SPREAD FOOTINGS

46. Spread footings should have a minimum depth of eighteen (18) inches below lowest adjacent pad grade (i.e., trenching depth) for soil subgrade. At this depth, the recommended design Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 19 of 44
bearing pressure for continuous footings should not exceed 2,500 p.s.f. due to dead plus sustained live loads and 3,300 p.s.f. due to all loads which include wind and seismic.

47. To accommodate lateral loads, the passive resistance of the foundation soil can be utilized.

The passive soil pressures can be assumed to act against the front face of the footing below a depth of one foot below the ground surface. It is recommended that a passive pressure equivalent to that of a fluid weighing 250 p.c.f. be used. The weight of the soil above the footing can be used in the frictional calculations. For design purposes, an allowable friction coefficient of 0.30 can be assumed at the base of the spread footing.

RETAINING WALL/SOUNDWALL FOUNDATION - PIER FOOTINGS

48. The piers should be designed on the basis of skin friction acting between the soil and the pier. For the soils at the site, an allowable skin friction value of 500 p.s.f. can be used for combined dead and live loads, below a depth of 2 feet. This value can be increased by one-third for total loads which include wind or seismic forces. Given the moderately expansive nature of the soil, we recommend that any grade beams footings or bottom of soundwall panels that are buried into the ground, should be designed for an uplift pressure of 1,500 p.s.f. acting against the bottom of the grade beam/soundwall panel and an uplift adhesion of 300 p.s.f. acting along the upper 2 feet of the pier. Resistance to uplift is to be provided by the pier foundations, and an allowable skin friction value of 500 p.s.f can be used below 2 feet. The size, depth and spacing of the piers is to be determined by the structural engineer.

49. To resist lateral loads, the passive resistance of the soil can be used. The soil passive pressures can be assumed to act against the lateral projected area twice the pier diameter. It is recommended that a passive pressure equivalent to that of a fluid weighing 250 p.c.f be used below 2 feet of final pad grade.

PAVEMENT AREAS

50. R-value tests were not performed as part of this investigation, as the soil expected at subgrade level is not known and depends on the planned grading. Assuming the subgrade material will consist of the moderately expansive clay material, we will assume an R-value of 5 for preliminary design.

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51. Based on an R-Value of 5, the following flexible pavement sections are recommended.

Traffic Index
AC
(inches)
Class II¹ AB
(inches)

4.5 3.0 10.0

5.0 3.0 12.0

5.5 3.0 14.0

6.0 4.0 13.5

7.0 4.0 17.0
Notes: ¹Minimum R-Value = 78
R-Value = Resistance Value
All Layers in compacted thickness to Cal-Trans Standard Specifications

52. After underground facilities have been placed in the areas to receive pavement and removal of excess material has been completed, the upper 6 inches of the sub-grade soil shall be scarified, moisture conditioned, and compacted to a minimum relative compaction of 95% in accordance with the grading recommendations specified in this report.

53. All aggregate base material placed subsequently should be compacted to a minimum relative compaction of 95% based on the ASTM Test Procedure of D1557-12 (latest edition). The construction of the pavement areas should conform to the requirements set forth by the latest Standard Specifications of the Department of Transportations of the State of California and/or City of Hercules, Department of Public Works.

54. If planter areas are provided within or immediately adjacent to the pavement areas, provisions should be made to control irrigation water from entering the pavement subgrade. Water entering the pavement section at subgrade level, which does not have a means for discharge, could cause softening of this zone.

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UTILITY TRENCHES

55. Applicable safety standards require that trenches in excess of 5 feet must be properly shored or that the walls of the trench slope back to provide safety for installation of lines. If trench wall sloping is performed, the inclination should vary with the soil type. The underground contractor should request an opinion from the Soil Engineer as to the type of soil and the resulting inclination.

56. With respect to state-of-the-art construction or local requirements, utility lines are generally bedded with granular materials. These materials can convey surface or subsurface water beneath the structures. It is, therefore, recommended that all utility trenches which possess the potential to transport water be sealed with a compacted impervious cohesive soil material or lean concrete where the trench enters/exits the building perimeter.

57. Utility trenches extending underneath all traffic areas must be backfilled with native or approved import material and compacted to a relative compaction of 90% to within 6 inches of the subgrade. The upper 6 inches should be compacted to 95% relative compaction in accordance with Laboratory Test Procedure ASTM D1557 (latest edition). Backfilling and compaction of these trenches must meet the requirements set forth by the City of Hercules, Department of Public Works. Utility trenches within landscape areas may be compacted to a relative compaction of 85%.

PROJECT REVIEW AND CONSTRUCTION MONITORING

58. All grading and foundation plans for the development must be reviewed by the Soil Engineer prior to contract bidding or submitted to governmental agencies so that plans are reconciled with soil conditions and sufficient time is allowed for suitable mitigative measures to be incorporated into the final grading specifications.

59. Quantum Geotechnical, Inc. should be notified at least two working days prior to site clearing, grading, and/or foundation operations on the property. This will give the Soil Engineer ample time to discuss the problems that may be encountered in the field and coordinate the work with the contractor.

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60. Field observation and testing during the demolition and/or foundation operations must be provided by representatives of Quantum Geotechnical, Inc. to enable them to form an opinion regarding the adequacy of the site preparation, the acceptability of fill materials, and the extent to which the earthwork construction and the degree of compaction comply with the specification requirements. Any work related to the grading and/or foundation operations performed without the full knowledge and under the direct observation of the Soil Engineer will render the recommendations of this report invalid. This does not imply full-time observation. The degree of observation and frequency of testing services would depend on the construction methods and schedule, and the item of work.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 23 of 44

REFERENCES

1. California Geological Survey. 1982. “State of California, Special Studies Zones, Mare Island”. 7.5 Minute Series (Topographic). Scale 1:24,000.

2. California Geological Survey. 2008. Guidelines for Evaluating and Mitigating Seismic Hazards in California. Special Publication 117A.

3. Graymer, R.W., Jones, D.L., and Brabb, E.E. 1994. Preliminary Geologic Map Emphasizing Bedrock Formations in Contra Costa County, California. U.S. Geological Survey. Open-File Report 94-622. Scale 1:75,000.

4. Nationwide Environmental Title Research, LLC. 2019. Historic Aerials. Accessed on July 30, 2020 from website: https://www.historicaerials.com/viewer.

5. Structural Engineers Association and Office of Statewide Health Planning and Development. 2018. “Seismic Design Maps”. Accessed August 14, 2020 from web site:
https://seismicmaps.org/.

6. U.S. Geological Survey and California Geological Survey. 2020. "Quaternary fault and fold database for the United States". Accessed August 14, 2020 from USGS web site:
http//earthquakes.usgs.gov/regional/qfaults/.

7. U.S. Geological Survey. 2020. “The National Map - Elevation”. Accessed August 14, 2020, from USGS website: https://viewer.nationalmap.gov/theme/elevation/##bottom

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LIMITATIONS AND UNIFORMITY OF CONDITIONS

1. It should be noted that it is the responsibility of the owner or his representative to notify Quantum Geotechnical, Inc., in writing, a minimum of two working days before any clearing, grading, or foundation excavations can commence at the site.

2. The recommendations of this report are based upon the assumption that the soil conditions do not deviate from those disclosed in the borings and from a reconnaissance of the site. Should any variations or undesirable conditions be encountered during the development of the site, Quantum Geotechnical, will provide supplemental recommendations as dictated by the field conditions.

3. This report is issued with the understanding that it is the responsibility of the owner, or his representative, to ensure that the information and recommendations contained herein are brought to the attention of the Architect and Engineer for the project and incorporated into the plans and the necessary steps are taken to see that the Contractor and Subcontractors carry out such recommendations in the field.

4. At the present date, the findings of this report are valid for the property investigated. With the passage of time, significant changes in the conditions of a property can occur due to natural processes or works of man on this or adjacent properties. In addition, legislation or the broadening of knowledge may result in changes in applicable standards. Changes outside of our control may render this report invalid, wholly or partially. Therefore, this report should not be considered valid after a period of two (2) years without our review, nor should it be used, or is it applicable, for any properties other than those investigated.

5. Not withstanding all the foregoing, applicable codes must be adhered to at all times.

APPENDIX A
Figure 1 - Site Vicinity and Fault Map
Figure 2 - Regional Geologic Map
Figure 3 - Site Plan
Logs of Test Borings
Key to Boring Log

San Andreas Fault
Sargent Fault
Calaveras Fault

QUANTUM
GEOTECHNICAL, INC.

SITE VICINITY AND FAULT MAP
Proposed Residential Development
215 Skelly, Hercules
Project No.

G025.G
Drawn by:

D.T.

Figure No.
1 1. Base Map: Google Earth, 2020 2. Fault Map Overlay: U.S. Geological Survey and California Geological Survey. 2020. Quaternary fault and fold database for the United States. Accessed August 14, 2020 from USGS web site: https://earthquake.usgs.gov/hazards/qfaults/.

SITE
Hayward Fault Zone
Calaveras Fault Zone

QUANTUM
GEOTECHNICAL, INC.

REGIONAL GEOLOGIC MAP
Proposed Residential Development
215 Skelly, Hercules
Project No.

G025.G
Drawn by:

D.T.

Figure No.
2 SITE
Map Legend
1) Af – Artificial Fill (Historic)
2) Qha – Alluvium (Holocene)
3) Qpa –Alluvial Fan Deposits (Pleistocene) 4) Ths – Hambre Sandstone ( Miocene) 5) fpv – Franciscan Complex Volcanic Rock (Cretaceous) 6) JKs – Great Valley Complex Sedimentary Rock
(Jurassic-Cretaceous)

1. Base Map: Google Earth, 2020 2. Geologic Map Overlay: Graymer, R.W., Moring, B.C., Saucedo, G.J., Wentworth, C.M., Brabb, E.E., and Knudsen, K.L. 2006. “Geologic Map of the San Francisco Bay Region”. USGS. Scientific Investigations Map 2918.

Qpa
Qha
Af
JKs
Ths

QUANTUM
GEOTECHNICAL, INC.

SITE PLAN
Proposed Residential Subdivision
215 Skelly, Hercules
Project No.

PENDING
Drawn by:

D.T.

Figure No.
3 Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Log of Boring B-1
Date(s)

Drilled 08-03-20
Drilling

Method Hollow Stem
Drill Rig

Type Mobile B-40
Groundwater Level

and Date Measured 11 ft.

Borehole

Backfill Grout
Logged By DT
Drill Bit

Size/Type 8 in.

Drilling

Contractor Exploration Geoservices
Sampling

Method(s) Modified California, SPT
Location See Site Plan
Checked By SM
Total Depth

of Borehole 45 ft.

Approximate

Surface Elevation 21 ft. amsl.

Hammer

Data Auto.

Material Type
ML
ML
CL
CL
CL
Graphic LogWater Content, %Percent Fines (-#200)LL, %PI, %

16.0 26.5

28.3 42.6

29.2 24.8
Dry Unit Weight, pcf
107.1

91.4 91.0

75.2 94.0

97.4 MATERIAL DESCRIPTION
Sandy SILT: Light greyish brown; dry; very fine sand; stiff; trace fine, subangular gravel.

At 5 ft.: Increase in fine sand; moist to very moist; medium stiff.

CLAY with Sand: Dark bluish grey; very moist; medium stiff; very fine sand.

Lean CLAY: Dark bluish grey; moist; stiff.

Silty CLAY: Dark olive brown; slightly moist; stiff; trace fine sand.

Depth (feet)
0 5
10 15
20 25
30 Sample Number
1-1
1-2
1-3
1-4
1-5
1-6
1-7
Sample TypeSampling Resistance, blows/ft
53 22
12 9
21 20
29 Elevation (feet) 21
16 11
6 1
-4
-9
C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Sheet 1 of 2
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520
Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Log of Boring B-1
Material Type
CL
SC-CL
CL
Graphic LogWater Content, %Percent Fines (-#200)LL, %PI, %

17.1 Dry Unit Weight, pcf
103.3

MATERIAL DESCRIPTION
Silty CLAY: Dark olive brown; slightly moist; stiff; trace fine sand.

Sandy CLAY: Dark yellow brown; moist; medium to fine sand; minor gravel; stiff; dense.

Silty CLAY: Dark olive brown with mottled orange brown; slightly moist; hard; well cemented. [Residual Soil?]
Bottom of Boring at 45 ft.

Groundwater was first encountered at 11 ft.

Depth (feet)
30 35
40 45
50 55
60 65
Sample Number
1-8
1-9
1-10
Sample TypeSampling Resistance, blows/ft
34 55
68 Elevation (feet) -9
-14
-19
-24
-29
-34
-39
-44
C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Sheet 2 of 2
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520
Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Log of Boring B-2
Date(s)

Drilled 08-03-20
Drilling

Method Hollow Stem
Drill Rig

Type Mobile B-40
Groundwater Level

and Date Measured 13 ft.

Borehole

Backfill Grout
Logged By DT
Drill Bit

Size/Type 8 in.

Drilling

Contractor Exploration Geoservices
Sampling

Method(s) Modified California
Location See Site Plan
Checked By SM
Total Depth

of Borehole 20 ft.

Approximate

Surface Elevation 21 ft. amsl.

Hammer

Data Auto.

Material Type
ML-CL
SC
SP
CL
LL, %
45 PI, %
20 Percent Fines (-#200)
28 Graphic LogWater Content, %

30.5 25.0
Dry Unit Weight, pcf

88.9 93.8

MATERIAL DESCRIPTION
Silty CLAY with Sand: Light olive brown; slightly moist; medium stiff; very fien sand.

Clayey SAND: Dark olive brown; moist; fine to very fine sand; trace fine gravel; medium dense.

Poorly-Graded SAND: Dark reddish brown; moist to very moist; medium to fine sand; minor coarse to fine, subrounded gravel; medium dense.

Silty CLAY: Dark olive brown; moist; very stiff.

Bottom of Boring at 20 ft.

Groundwater was first encountered at 13 ft.

Depth (feet)
0 5
10 15
20 25
30 Sample Number
2-1
2-2
2-3
2-4
Sample TypeSampling Resistance, blows/ft
13 24
41 34
Elevation (feet) 21
16 11
6 1
-4
-9
C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Sheet 1 of 1
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520
Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Log of Boring B-3
Date(s)

Drilled 08-03-20
Drilling

Method Hollow Stem
Drill Rig

Type Mobile B-40
Groundwater Level

and Date Measured None Encountered
Borehole

Backfill Grout
Logged By DT
Drill Bit

Size/Type 8 in.

Drilling

Contractor Exploration Geoservices
Sampling

Method(s) Modified California
Location See Site Plan
Checked By SM
Total Depth

of Borehole 24.5 ft.

Approximate

Surface Elevation 21 ft. amsl.

Hammer

Data Auto.

Material Type
CL
ML
Siltstone
LL, %
19 PI, %
13 Graphic LogWater Content, %Percent Fines (-#200)

11.4 14.8
Dry Unit Weight, pcf
107.7
104.8

MATERIAL DESCRIPTION
Silty CLAY: Greyish brown; dry to slightly moist; trace medium to fine sand; hard.

Lean SILT: Yellow brown; dry to slightly moist; minor very fine sand; hard; very well cemented.

SILTSTONE: Yellow to greenish brown; dry; hard; highly weathered; poorly indurated.

Bottom of Boring at 24.5 ft.

No groundwater was encountered.

Depth (feet)
0 5
10 15
20 25
30 Sample Number
3-1
3-2
3-3
3-4
3-5
3-6
Sample TypeSampling Resistance, blows/ft
55 82
51 65
25 50-5"
25 50-4"
Elevation (feet) 21
16 11
6 1
-4
-9
C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Sheet 1 of 1
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520
Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Log of Boring B-4
Date(s)

Drilled 08-03-20
Drilling

Method Hollow Stem
Drill Rig

Type Mobile B-40
Groundwater Level

and Date Measured None Encountered
Borehole

Backfill Grout
Logged By DT
Drill Bit

Size/Type 8 in.

Drilling

Contractor Exploration Geoservices
Sampling

Method(s) Modified California, SPT
Location See Site Plan
Checked By SM
Total Depth

of Borehole 24.5 ft.

Approximate

Surface Elevation 21 ft. amsl.

Hammer

Data Auto.

Material Type
Asphalt
CL
ML
SW-SM
Siltstone
LL, %
29 PI, %
29 Graphic LogWater Content, %Percent Fines (-#200)

35.4 Dry Unit Weight, pcf

28.1 MATERIAL DESCRIPTION
8" of Base Rock.

Silty CLAY: Dark brown; moist; stiff.

Sandy SILT: Yellow to orange brown; dry to slightly moist; stiff; medium sand; trace fine gravel.

Silty to Well-Graded SAND: Orange brown; moist containing wet pockets; coarse to fine sand; minor fine, subrounded gravel; dense. [Residual Soil?]
SILTSTONE: Dark olive brown with orange brown weathered faces; hard; highly weathered; poorly indurated.

Bottom of Boring at 24.5 ft.

No groundwater was encountered.

Depth (feet)
0 5
10 15
20 25
30 Sample Number
4-1
4-2
4-3
4-4
4-5
Sample TypeSampling Resistance, blows/ft
28 50-5"
40 50-4"
23 50-4"
33 50-6"
Elevation (feet) 21
16 11
6 1
-4
-9
C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Sheet 1 of 1
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520
Project: Proposed Residential
Development
Project Location: 215 Skelly, Hercules
Project Number: G025.G
Key to Log of Boring
Elevation (feet)Depth (feet)Sample TypeSample NumberSampling Resistance, blows/ftMaterial TypeGraphic Log

MATERIAL DESCRIPTION
Water Content, %Dry Unit Weight, pcfPercent Fines (-#200)LL, %PI, % 1 2 3 4 5 6 7 8 9 10 11 12 13

COLUMN DESCRIPTIONS
1 Elevation (feet): Elevation (MSL, feet).
2 Depth (feet): Depth in feet below the ground surface. 3 Sample Type: Type of soil sample collected at the depth interval shown.
4 Sample Number: Sample identification number.
5 Sampling Resistance, blows/ft: Number of blows to advance driven sampler one foot (or distance shown) beyond seating
interval
using the hammer identified on the boring log.
6 Material Type: Type of material encountered.
7 Graphic Log: Graphic depiction of the subsurface material encountered.
8 MATERIAL DESCRIPTION: Description of material encountered.

May include consistency, moisture, color, and
other descriptive
text.
9 Water Content, %: Water content of the soil sample, expressed as percentage of dry weight of sample.
10 Dry Unit Weight, pcf: Dry weight per unit volume of soil sample measured in laboratory, in pounds per cubic
foot.
11 Percent Fines (-#200): The percent fines (soil passing the No. 200 Sieve) in the sample. WA indicates a
Wash Sieve, SA indicates a
Sieve Analysis.
12 LL, %: Liquid Limit, expressed as a water content.
13 PI, %: Plasticity Index, expressed as a water content.

FIELD AND LABORATORY TEST ABBREVIATIONS
CHEM: Chemical tests to assess corrosivity
COMP: Compaction test
CONS: One-dimensional consolidation test
LL: Liquid Limit, percent
PI: Plasticity Index, percent
SA: Sieve analysis (percent passing No. 200 Sieve)
UC: Unconfined compressive strength test, Qu, in ksf
WA: Wash sieve (percent passing No. 200 Sieve)

MATERIAL GRAPHIC SYMBOLS
Lean CLAY, CLAY w/SAND, SANDY CLAY (CL)
SILT, SILT w/SAND, SANDY SILT (ML)
Clayey SAND (SC)
Clayey SAND to Sandy CLAY (SC-CL)
Siltstone
Poorly graded SAND (SP)
Well graded SAND with Silt (SW-SM)

TYPICAL SAMPLER GRAPHIC SYMBOLS

2.5-inch-OD Modified
California w/ brass liners
2-inch-OD unlined split
spoon (SPT)

OTHER GRAPHIC SYMBOLS
Water level (at time of drilling, ATD)
Water level (after waiting)
Minor change in material properties within a
stratum
Inferred/gradational contact between strata
? Queried contact between strata

GENERAL NOTES
1: Soil classifications are based on the Unified Soil Classification System. Descriptions and stratum lines are interpretive, and actual lithologic changes may be gradual. Field descriptions may have been modified to reflect results of lab tests. 2: Descriptions on these logs apply only at the specific boring locations and at the time the borings were advanced. They are not warranted to be representative of subsurface conditions at other locations or times.

C:\Users\Danepc\Desktop\Project Files\G Projects\G025.G - Skelly, Hercules\Boring Logs.bg4[Soil Boring Lab.tpl] Figure B-1
Sheet 1 of 1
Quantum Geotechnical, Inc.
1110 Burnett Ave., Ste B

Concord, CA 94520

APPENDIX B
Laboratory Investigation
Summary of Laboratory Test Results
Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 36 of 44

LABORATORY INVESTIGATION
The laboratory testing program was directed towards providing sufficient information for the determination of the engineering characteristics of the site soils so that the recommendations outlined in this report could be formulated.

The following tests were performed
 Moisture content;
 Sieve analysis
 Atterberg Limits tests;
A summary of all laboratory test results is presented on Table B-I of this appendix and on the respective "Logs of Test Borings", Appendix A.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 37 of 44

SUMMARY OF LABORATORY TESTS
TABLE B-1
Sample
Number
Depth
(ft)
Moisture
Content
(% Dry
Wt.)
Dry Density
(pcf)
Sieve
Analysis
(% Passing
No. 200 Sieve)
Atterberg Limits
Liquid
Limit
(%)
Plasticity
Index
(%)
1-1 2.0 16.0 107.1 -- -- --
1-2 3.5 26.5 91.4 -- -- --
1-3 8.5 28.3 91.0 -- -- --
1-4 13.5 42.6 75.2 -- -- --
1-5 18.5 29.2 94.0 -- -- --
1-7 28.5 24.8 97.4 -- -- --
1-9 38.5 17.1 103.3 -- -- --
2-1 3.5 30.5 88.9 -- 45 20
2-3 13.5 25.0 93.8 28 -- --
3-1 2.0 11.4 107.7 -- 19 13
3-3 8.5 14.8 104.8 -- -- --
4-1 3.5 35.4 28.1 -- 29 29
Appendix C
The Grading Specification
Guide Specifications for Rock Under Floor Slabs

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 39 of 44

THE GRADING SPECIFICATIONS
on
Proposed Residential Development
215 Skelly
Hercules, California

1. General Description

1.1 These specifications have been prepared for the grading and site development of the subject residential development. Quantum Geotechnical Inc., hereinafter described as the Soil Engineer, should be consulted prior to any site work connected with site development to ensure compliance with these specifications.

1.2 The Soil Engineer should be notified at least two working days prior to any site clearing or grading operations on the property in order to observe the stripping of organically contaminated material and to coordinate the work with the grading contractor in the field.

1.3 This item shall consist of all clearing or grubbing, preparation of land to be filled, filling of the land, spreading, compaction and control of fill, and all subsidiary work necessary to complete the grading of the filled areas to conform with the lines, grades, and slopes as shown on the accepted plans. The Soil Engineer is not responsible for determining line, grade elevations, or slope gradients.

The property owner, or his representative, shall designate the person or organizations who will be responsible for these items of work.

1.4 The contents of these specifications shall be integrated with the soil report of which they are a part; therefore, they shall not be used as a self-contained document.

2. Tests
The standard test used to define maximum densities of all compaction work shall be the ASTM D1557-12 Laboratory Test Procedure. All densities shall be expressed as a relative compaction in terms of the maximum dry density obtained in the laboratory by the foregoing standard procedure.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 40 of 44

3. Clearing, Grubbing, and Preparing Areas To Be Filled

3.1 If encountered, all vegetable matter, trees, root systems, shrubs, debris, and organic topsoil shall be removed from all structural areas and areas to receive fill.

3.2 If encountered, any soil deemed soft or unsuitable by the Soil Engineer shall be removed.

Any existing debris or excessively wet soils shall be excavated and removed as required by the Soil Engineer during grading.

3.3 All underground structures shall be removed from the site such as old foundations, abandoned pipe lines, septic tanks, and leach fields.

3.4 The final stripped excavation shall be approved by the Soil Engineer during construction and before further grading is started.

3.5 After the site has been cleared, stripped, excavated to the surface designated to receive fill, and scarified, it shall be disked or bladed until it is uniform and free from large clods. The native subgrade soils shall be moisture conditioned and compacted to the requirements as specified in the grading section of this report. Fill can then be placed to provide the desired finished grades. The contractor shall obtain the Soil Engineer's approval of subgrade compaction before any fill is placed.

4. Materials

4.1 All fill material shall be approved by the Soil Engineer. The material shall be a soil or soilrock mixture which is free from organic matter or other deleterious substances. The fill material shall not contain rocks or lumps over 6 inches in greatest dimension and not more than 15% larger than 2- 1/2 inches. Materials from the site below the stripping depth are suitable for use in fills provided the above requirements are met.

4.2 Materials existing on the site are suitable for use as compacted engineered fill after the removal of all debris and organic material. All fill soils shall be approved by the Soil Engineer in the field.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 41 of 44

4.3 Should import material be required, it should be approved by the soil Engineer before it is brought to the site.

5. Placing, Spreading, and Compacting Fill Material

5.1 The fill materials shall be placed in uniform lifts of not more than 8 inches in uncompacted thickness. Each layer shall be spread evenly and shall be thoroughly blade mixed during the spreading to obtain uniformity of material in each layer. Before compaction begins, the fill shall be brought to a water content that will permit proper compaction by either (a) aerating the material if it is too wet, or (b) spraying the material with water if it is too dry.

5.2 After each layer has been placed, mixed, and spread evenly, either import material or native material shall be compacted to a relative compaction designated for engineered fill.

5.3 Compaction shall be by footed rollers or other types of acceptable compacting rollers. Rollers shall be of such design that they will be able to compact the fill to the specified density. Rolling shall be accomplished while the fill material is within the specified moisture content range. Rolling of each layer shall be continuous over its entire area and the roller shall make sufficient trips to ensure that the required density has been obtained. No ponding or jetting shall be permitted.

5.4 Field density tests shall be made in each compacted layer by the Soil Engineer in accordance with Laboratory Test Procedure ASTM D1556-15 or D6938-10. When footed rollers are used for compaction, the density tests shall be taken in the compacted material below the surface disturbed by the roller. When these tests indicate that the compaction requirements on any layer of fill, or portion thereof, has not been met, the particular layer, or portion thereof, shall be reworked until the compaction requirements have been met.

5.5 No soil shall be placed or compacted during periods of rain nor on ground which contains free water. Soil which has been soaked and wetted by rain or any other cause shall not be compacted until completely drained and until the moisture content is within the limits hereinbefore described or Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 42 of 44
approved by the Soil Engineer. Approval by the Soil Engineer shall be obtained prior to continuing the grading operations.

6. Pavement

6.1 The proposed subgrade under pavement sections, native soil, and/or fill shall be compacted to a minimum relative compaction of 95% at 2% above optimum moisture content for a depth of 12 inches.

6.2 All aggregate base material placed subsequently should also be compacted to a minimum relative compaction of 95% based on the ASTM Test Procedure D1557-12. The construction of the pavement in the parking and traffic areas should conform to the requirements set forth by the latest Standard Specifications of the Department of Transportation of the State of California and/or City of Hercules, Department of Public Works.

6.3 It is recommended that soils at the proposed subgrade level be tested for a pavement design after the preliminary grading is completed and the soils at the site design subgrade levels are known.

7. Utility Trench Backfill

7.1 The utility trenches extending under concrete slabs-on-grade shall be backfilled with native on-site soils or approved import materials and compacted to the requirements pertaining to the adjacent soil. No ponding or jetting will be permitted.

7.2 Utility trenches extending under all pavement areas shall be backfilled with native or approved import material and properly compacted to meet the requirements set forth by the City of Hercules, Department of Public Works.*

7.3 Where any opening is made under or through the perimeter foundations for such items as utility lines and trenches, the openings must be resealed so that they are watertight to prevent the possible entrance of outside irrigation or rain water into the underneath portion of the structures.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 43 of 44

8. Subsurface Line Removal

8.1 The methods of removal will be designated by the Soil Engineer in the field depending on the depth and location of the line. One of the following methods will be used.

8.2 Remove the pipe and fill and compact the soil in the trench according to the applicable portions of sections pertaining to compaction and utility backfill.

8.3 The pipe shall be crushed in the trench. The trench shall then be filled and compacted according to the applicable portions of Section 5.

8.4 Cap the ends of the line with concrete to prevent entrance of water. The length of the cap shall not be less than 5 feet. The concrete mix shall have a minimum shrinkage.

9. Unusual Conditions

9.1 In the event that any unusual conditions not covered by the special provisions are encountered during the grading operations, the Soil Engineer shall be immediately notified for additional recommendations.

10. General Requirements
Dust Control

10.1 The contractor shall conduct all grading operations in such a manner as to preclude windblown dirt and dust and related damage to neighboring properties. The means of dust control shall be left to the discretion of the contractor and he shall assume liability for claims related to windblown material.

Project No. G025.G Geotechnical Investigation/215 Skelly, Hercules November 11, 2021 Quantum Geotechnical, Inc. Page 44 of 44

GUIDE SPECIFICATIONS FOR ROCK UNDER FLOOR SLABS
Definition
Graded gravel or crushed rock for use under slabs-on-grade shall consist of a minimum thickness of mineral aggregate placed in accordance with these specifications and in conformance with the dimensions shown on the plans. The minimum thickness is specified in the accompanying report.

Material
The mineral aggregate shall consist of broken stone, crushed or uncrushed gravel, quarry waste, or a combination thereof. The aggregate shall be free from deleterious substances. It shall be of such quality that the absorption of water in a saturated dry condition does not exceed 3% of the oven dry weight of the sample.

Gradation
The mineral aggregate shall be of such size that the percentage composition by dry weight, as determined by laboratory sieves (U.S. Sieves) will conform to the following gradation:

Sieve Size Percentage Passing
¾’’ 90-100
No. 4 25-60
No. 8 18-45
No. 200 0-3
Placing
Subgrade, upon which gravel or crushed rock is to be placed, shall be prepared as outlined in the accompanying soil report.

City of Hercules–Skelly Residential Project
Initial Study/Mitigated Negative Declaration
FirstCarbon Solutions
D.2 - Paleontological Records Search

THIS PAGE INTENTIONALLY LEFT BLANK
Paleontological Records Search: Skelly Residential Project (2118.0006) K.L. Finger Kenneth L. Finger, Ph.D.

Consulting Paleontologist
18208 Judy St., Castro Valley, CA 94546-2306 510.305.1080 [email protected] December 27, 2021
Dana DePietro
FirstCarbon Solutions
1350 Treat Boulevard, Suite 380
Walnut Creek, CA 94597
Re: Paleontological Records Search: Skelly Residential Project (2118.0006), City of Hercules, Contra Costa County, California Dear Dr. DePietro:

As per your request, I have performed a records search on the University of California Museum of Paleontology (UCMP) database for the Skelly Residential Project in Hercules. The 7.3-acre project site is on the north side of the Atchison, Topeka and Santa Fe Railroad and east side of Pinole Creek (the border between Hercules and Pinole). Its PLS location is NW¼, NE¼, Sec. 22, T2N, R4W, Mare Island Quadrangle (1985 USGS 7.5-series topographic map). Google Earth imagery shows this flat terrain is partially covered with trees and has an indeterminate degree of disturbance (its prior usage is uncertain).

Geologic Units
According to the part of the geologic map by Dibblee and Minch (2005) shown here, the Skelly Residential Project site (yellow outline at
center) is located on Holocene alluvium
(Qa) and late Miocene siliceous rocks of
the Monterey Formation (Tmc). The surrounding half-mile search are (dashed outline) also includes the older clastic
(nonsiliceous) rocks of the Monterey
Formation (Tm) and the Pliocene Orinda
Formation (Tor), both of which could be
present in the subsurface of the project
site.

Key to mapped units
Qa Surficial alluvium (Holocene)
Tor Orinda Formation (Pliocene)
Tmc Monterey Fm siliceous shale, mudstone, & diatomite, bedded to massive (late Miocene) Tm Monterey Fm clay shale & siltstone, massive to
vaguely bedded (middle to late Miocene)
Paleontological Records Search: Skelly Residential Project (2118.0006) K.L. Finger 2 Records Search
Holocene deposits are too young to be fossiiferous. The records search on the UCMP database therefore focused on the Orinda and Monterey formations.

The Orinda Formation is represented by 26 vertebrate localities: 23 in Contra Costa County and three in Alameda County. None are within 15 miles of the project site; hence, the local paleontological potential of the Orinda Formation appears to be low. The composite assemblage in the UCMP collection comprises 140 specimens (see Appendix 1 taxonomic list). There are 198 plant localities recorded from the Orinda Formation, all from the Caldecott Tunnel II Project in Alameda County. The flora includes Betula (birch), Magnolia (magnolia), Persea (laurel), Platanus (plane tree), Populus (poplar), Quercus (oak), Salix (willow), Ulma (elm), and Umbellaria (bay laurel).

The record search for the Skelly Residential project performed on the UCMP database focused on the vertebrate and plant localities in the Orinda and Monterey Formations, both of which are ranked as highly sensitive for significant paleontological resources. The database lists four vertebrate localities in the Monterey Formation in Contra Costa County. Nearest to the project site is V4646 (Tormey B), about three miles to the northeast, which yielded a whale vertebra; hence, the Monterey Formation is ranked locally with a moderate to high paleontological sensitivity.

The other three localities are more than eight miles to the southeast but none of their vertebrates are listed in the database. There UCMP database lists 27 vertebrate localities in the Monterey Formation elsewhere in California: one in San Benito County, one in Monterey County, two in Kern County, 11 in Los Angeles County, and 12 in San Bernardino County. Appendix 2 is a taxonomic list for the composite assemblage of 443 specimens. There are many more vertebrates from the widespread Monterey Formation housed in the museums of Southern California, particularly the Natural History Museum of Los Angeles County. The UCMP database lists no plant localities in this unit.

Remarks and Recommendations
I do not recommend a paleontological walkover survey of the Skelly Residential Project site because its surface is disturbed. The project will impact Miocene deposits of the Monterey Formation Formation and possibly impact the Pliocene Orinda Formation below the surficial Holocene alluvium. Although the widespread Monterey Formation has produced many vertebrate specimens, its yield in Contra Costa County is limited a single whale vertebra. The Orinda Formation has been more productive in the County, but at considerable distance from the project site, and its depth below the surficial layer on the site is unknown. It therefore appears that if the unit is disturbed by construction activities, is unlikely to yield any significant paleontological resources. Thus, I do not recommend paleontological monitoring of construction activities. Instead, a professional paleontologist should provide the construction crew with an orientation prior to the commencement of earth-disturbing activities so they are aware of the significant fossils that could be encountered and the appropriate procedures to follow.

If any vertebrate remains (i.e., bones, teeth, or unusually abundant and well-preserved invertebrates or plants) be unearthed, the crew should not attempt to remove them, as they could be extremely fragile and therefore prone to crumbling, and to ensure their occurrence is properly recorded; instead, all work in the immediate vicinity of the discovery should be diverted at least 15 feet until a professional paleontologist assesses the find and, if deemed appropriate, salvages it in a timely manner. All recovered fossils should be deposited in an appropriate repository, such as the UCMP, where they will be properly curated and made accessible for future study.

Paleontological Records Search: Skelly Residential Project (2118.0006) K.L. Finger 3 Sincerely,
Reference Cited
Dibblee, T.W., Jr., and Minch, J.A., 2005. Geologic map of the Mare Island quadrangle, Contra Costa, Solano, Marin, & Sonoma counties, California. Dibblee Foundation Map DF-145, scale 1:24,000.

APPENDIX 1
UCMP Vertebrates from the Pliocene Orinda Formation
Class Osteichthyes (bony fish)
Order Lepisosteiformes
Family Lepisosteidae
Lepisosteus (gar)
Order Perciformes
Family cf. Lutjanidae (snappers)
Family Cyprinidae (carps & minnows)
Class Reptilia (reptiles)
Order Testudines
Family Testudinidae
Hesperotestudo (tortoise)
Class Aves (birds)
Class Mammalia (mammals)
Order Artiodactyla (even-toed ungulates)
Family Camelidae (camels)
Procamelus
Family Dromomerycidae
Cranioceras
Family Merycoidodontidae (oreodonts)
Ticholeptus
Order Carnivora
Family Felidae
Barbourofelis (false sabre-tooth cat)
Family Mustelidae (weasels, badgers,
etc.)
Order Cetacea
Family Cetotheriidae (baleen whales)
Order Desmostylia
Family Desmostylidae
Desmostylus (extinct hippo-like
marine mammal)
Order Lagomorpha
Family Leporidae (rabbits & hares)
Hypolagus
Order Lipotyphla
Family Soricidae
Sorex (shrew)
Order Perissodactyla (odd-toed ungulates)
Family Equidae (horses)
Hipparion cf. H. mohavense
Nannippus tehonensis
Pliohippus cf. P. leardi
Family Rhinocerotidae (rhinoceroses)
Aphelops?
Order Proboscidea
Family Gomphotheriidae
Gomphotherium simpsoni
Family Mammutidae (mastodons)
Order Rodentia
Family Cricetidae (mice)
Copemys
Family Geomyidae (gopher)
cf. Pliosaccomys
Paleontological Records Search: Skelly Residential Project (2118.0006) K.L. Finger 4 APPENDIX 2
UCMP Vertebrates from the Miocene Monterey Formation
Class Chondrichthyes (cartilaginous fish)
Order Batoidea
Myliobatidae
Myliobatis (eagle ray)
Order Carcharhiniformes
Family Carcharhinidae
Galeocerdo aduncus (tiger shark)
Galeocerdo cuvieri (tiger shark)
Carcharhinus brachyurus (copper
shark)
Carcharhinus priscus (gray shark)
Carcharhinus reticulata (bull shark)
Negaprion eurybathrodon
Physogaleus contortus
Family Hemigaleidae
Hemipristis serra (snaggletooth shark)
Order Lamniformes
Family Lamnidae
Cosmopolitodus hastalis (broadtoothed white shark)
Isurus oxyrinchus (shortfin mako
shark)
Isurus paucus (longfin mako shark)
Isurus planus (hooked-tooth mako)
Family Odontaspididae
Carcharias taurus (sand tiger shark)
Order Squatiniformes
Family Squatinidae
Squatina californica
(Pacific angelshark)
Class Reptilia (reptiles)
Order Testudines (turtles)
Family Cheloniidae (green turtle, etc.)
Family Dermochelyidae (leatherback
turtle, etc.)
Psephophorus
Class Osteichthyes (bony fish)
Order Clupeiformes
Family Clupeidae
Ganolytes cameo (sardine)
Order Gadiformes (cod)
Order Perciformes (perch-like fish)
Family Carangidae
Family Echeneidae
Order Pleuronectiformes (flatfish)
Family Bothidae (lefteye flounders)
Paralichthys
Class Aves (birds)
Order Pelecaniformes
Family Pseudodontornithidae
Osteodontornis orri (bony-toothed bird)
Family Sulidae
Palaeosula stocktoni (booby)
Class Mammalia (mammals)
Order Carnivora
Family Otariidae
Allodesmus cf. A. kernensis (sea lion)
Order Cetacea
Family Balaenopteridae
Plesiocetus occidentalis (baleen whale)
Family Cetotheriidae
cf. Nannocetus (baleen whale)
Family Iniidae
Kampholophos serrulus (dolphin)
Family Kentriodontidae
Loxolithax stocktoni (porpoise)
Family Physeteridae (toothed whales)
Order Desmostylia
Family Desmostylidae
Desmostylus hesperus (extinct hippo-like
marine mammal)
Order Proboscidea
Family Mammutidae
Mammut americanum (American mastodon)
Order Sirenia
Family Dugongidae
Dusisiren jordani (dugong)
City of Hercules–Skelly Residential Project
Initial Study/Mitigated Negative Declaration
FirstCarbon Solutions
Hazards and Hazardous Materials Supporting Information

THIS PAGE INTENTIONALLY LEFT BLANK
10777 Westheimer Road, Suite 975
Houston, Texas 77042
Phase I Environmental Site Assessment
Skelly
215 Skelly
Hercules, Contra Costa County, California 94547
Prepared for
Edward R. Perez
Vice President & Environmental Manager
D.R. Horton, Inc.
1341 Horton Circle
Arlington, Texas 76011
January 5, 2022
157517.025.BAD014
i
Privileged and Confidential Attorney Work Product
Table of Contents
List of Figures.............................................................................................................................................. iii List of Tables ............................................................................................................................................... iii List of Abbreviations ................................................................................................................................... iv Executive Summary ............................................................................................................................... ES-1 Property Description....................................................................................................................... ES-1 Site and Area Reconnaissance ..................................................................................................... ES-1 Physical Setting .............................................................................................................................. ES-2 Records Review.............................................................................................................................. ES-3 Interviews........................................................................................................................................ ES-3 Findings, Opinions, and Conclusions ............................................................................................ ES-3

1. Introduction .......................................................................................................................................1-1

1.1 Purpose ...................................................................................................................................1-1

1.2 Scope of Services ...................................................................................................................1-1

1.3 Limiting Conditions .................................................................................................................1-1

1.4 Exceptions or Deviations from Standard...............................................................................1-3

2. User Provided Information................................................................................................................2-1

2.1 Reason for Performing Phase I ESA ......................................................................................2-1

2.2 Commonly Known or Reasonably Ascertainable Information..............................................2-1

2.3 Property Value Comparison to Purchase Price .....................................................................2-1

2.4 Specialized Knowledge...........................................................................................................2-1

2.5 Title Records ...........................................................................................................................2-1

2.6 Environmental Liens or Activity and Use Limitations ...........................................................2-1

2.7 Owner, Property Manager, or Occupant Information............................................................2-2

3. Site Physical Setting Overview .........................................................................................................3-1

3.1 Location...................................................................................................................................3-1

3.2 Current Ownership..................................................................................................................3-1

3.3 Physical Characteristics .........................................................................................................3-1

3.3.1 Physical Features and Topography .........................................................................3-1

3.3.2 Geology and Hydrology.............................................................................................3-1

4. Records Review.................................................................................................................................4-1

4.1 Historical Use Information......................................................................................................4-1

4.2 Vapor Encroachment Screening ............................................................................................4-1

4.3 Previous Investigations and Assessments............................................................................4-2

4.4 Standard Environmental Regulatory Record Sources..........................................................4-2

4.5 Orphan Summary................................................................................................................. 4-12

4.6 Additional Environmental Record Sources......................................................................... 4-13 Phase I Environmental Site Assessment
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4.6.1 Local Fire Department .......................................................................................... 4-13

4.6.2 Department of Health/Environmental Division ................................................... 4-13

4.6.3 Building Permit/Inspection Department.............................................................. 4-13

5. Interviews...........................................................................................................................................5-1

5.1 Interviews with Owners, Occupants, and Others Knowledgeable of the Target Property ..5-1

6. Site and Area Reconnaissance ........................................................................................................6-1

6.1 Methodology and Limiting Conditions ...................................................................................6-1

6.2 Site Reconnaissance..............................................................................................................6-1

6.3 Area Reconnaissance.............................................................................................................6-3

6.3.1 North .........................................................................................................................6-3

6.3.2 East ...........................................................................................................................6-3

6.3.3 South.........................................................................................................................6-3

6.3.4 West ..........................................................................................................................6-3

7. Findings, Opinions, and Conclusions ...............................................................................................7-1

7.1 Summary of Findings..............................................................................................................7-1

7.2 Data Failures and Gaps..........................................................................................................7-1

7.2.1 Data Failures ............................................................................................................7-1

7.2.2 Data Gaps .................................................................................................................7-1

7.3 Conclusions and Recommendations.....................................................................................7-2

7.4 Environmental Professional’s Statement and Signature .....................................................7-3

8. Environmental Professionals’ Qualifications...................................................................................8-1

9. References ........................................................................................................................................9-1 Appendix A: Figures
Appendix B: Site and Surrounding Area Photographs
Appendix C: EDR
Appendix D: Historical Research Documentation
Appendix E: VES Report
Appendix F: User Questionnaire
Appendix G: Qualifications of Environmental Professionals Phase I Environmental Site Assessment
Skelly, Hercules, Contra Costa County, California Table of Contents iii
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List of Figures
Figure 1 – Vicinity Map
Figure 2 – Target Property Map
Figure 3 – Aerial Photograph
Figure 4 – Topographic Map
List of Tables
Table 6-1. List of Structures................................................................................................................. ES-2 Table 6-1. List of Structures....................................................................................................................6-2 Table 6-2. Conditions Observed During Site Reconnaissance..............................................................6-2 Phase I Environmental Site Assessment
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List of Abbreviations
AAI Rule 40 CFR Part 312, Standards and
Practices for All Appropriate
Inquiries; Final Rule
ACM asbestos-containing material
AIRS Aerometric Information Retrieval
System
amsl above mean sea level
AOC area of concern
APN Assessor’s Parcel Number
AST aboveground storage tank
ASTM American Society for Testing and
Materials
ASTM E 1527-13 ASTM Standard Practice E 1527-13
AUL Activity and Use Limitation
BC Brown and Caldwell
BMP best management practice
CalEPA California Environmental Protection
Agency
CERCLA Comprehensive Environmental
Response, Compensation, and
Liability Act
CERCLIS Comprehensive Environmental
Response, Compensation, and
Liability Information System
CERS CalEPA Regulated Site Portal Data
CHMIRS California Hazardous Material
Incident Report System
CIWQS California Integrated Water Quality
System
COC chemical of concern
CPS Cleanup Program Sites
CREC controlled recognized
environmental condition
DEED Deed Restriction Listing
DHI D.R. Horton, Inc.

DTSC Department of Toxic Substances
Control
ECHO Environmental Compliance and
History Online
EDR Environmental Data Resources, Inc.

EMI Emissions Inventory Data
EP Environmental Professional
EPA Environmental Protection Agency
ESA Environmental Site Assessment
FEMA Federal Emergency Management
Agency
FFIS Federal Facilities Information
System
FINDS Facility Index System/Facility
Registry System
FURS Federal Underground Injection
Control
HREC historical recognized environmental
condition
HRHR High Risk Historical Record
HSWA Hazardous and Solid Waste
Amendment
HVAC heating, ventilation, or air
conditioning
HWTS Hazardous Waste Tracking System
kg kilogram
LBP lead-based paint
LNAPL light non-aqueous phase liquid
LQG large quantity generator
LUST leaking underground storage tank
msd minimum search distance
NFA No Further Action
NFRAP No Further Remedial Action
Planned
NPDES National Pollutant Discharge
Elimination System
NPL National Priorities List
PADS PCB Activity Data System
PCB polychlorinated biphenyl
pCi/L picocuries per liter
PCS Permit Compliance System
RCRA Resource Conservation and
Recovery Act
REC recognized environmental condition
SEMS Superfund Enterprise Management
System
SLIC Spills, Leaks, Investigations, and
Cleanups
SMBRP Site Mitigation and Reuse Program
SQG small quantity generator
Phase I Environmental Site Assessment
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SWEEPS Statewide Environmental
Evaluation and Planning System
SWF/LF solid waste facility/landfill
SWPPP stormwater pollution prevention
plan
SWRCB State Water Resource Control
Board
U.S. United States
U.S.C. United States Code
USEPA United States Environmental
Protection Agency
USGS United States Geological Survey
UST underground storage tank
VCP Voluntary Cleanup Program
VEC vapor encroachment condition
VES vapor encroachment screening
ES-1
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Executive Summary
Brown and Caldwell (BC) performed a Phase I Environmental Site Assessment (ESA) for the property located at 215 Skelly in Hercules, Contra Costa County, California 94547 (target property). This Phase I ESA is intended to serve D.R. Horton, Inc. (DHI) as an appropriate, commercially prudent, and reasonable inquiry regarding the potential for recognized environmental conditions (RECs) in connection with the target property. This ESA was authorized by Robyn Bush and confirmed by issue of BC Project Order 157517.025.BAD014 on December 14, 2021. The site reconnaissance was conducted by Kaitlin Tanel of BC on December 22, 2021.

Property Description
The target property consists of 7.3 acres of partially developed land with multiple structures including a residence, barns, and other outbuildings. The target property is located in the vicinity of latitude

38.008834 degrees north and longitude 122.289084 degrees west in Hercules, Contra Costa County, California 94547. Access to the target property is from the east via Skelly and the northwest via Rosti.

See Figures 1 and 2 for a Vicinity Map and Target Property Map, respectively.

Site and Area Reconnaissance
BC understands that DHI is under contract to purchase the Skelly residential development. At the time of the site reconnaissance, the property consisted of partially developed land with multiple structures including a residence, barns, and other outbuildings. The surface was relatively flat terrain. Asphalt roadways without curbs and gutters and unpaved, dirt roadways were present onsite. Debris was observed on the northern, northwestern, central, southwestern, and southern portions of the property and consisted of wheelbarrows, a separated truck, a diesel container, plastic, metal, appliances, a burned outbuilding and materials, empty 55-gallon drums, a traffic cone, a dilapidated chicken coop, equipment, Conex containers, a storage unit, paint cans and buckets, structure debris, piping, a play structure, and a tire Utilities, including water and electricity were observed on the property.

An overhead power transmission line is located on the southern portion of the target property, oriented northwest to southeast.

A burned area with a burned outbuilding and materials from a recent fire is present on the central portion of the target property.

BC's site reconnaissance revealed evidence of one (1) water AST located on the southwestern portion of the target property. The AST appeared to be in good condition with no evidence of releases such as staining.

BC's site reconnaissance revealed evidence of hazardous materials on the central portion of the target property from spilled paint buckets and the presence of a diesel container and other unmarked containers inside and around the garage on the central portion of the target property. Minor staining was observed on the ground and flooring near the containers. BC has determined that the staining is de minimis and does not present a REC to the target property.

Electrical transformers are often a source of environmental concern due to the potential presence of polychlorinated biphenyl (PCB)-containing cooling oils used in some units. Equipment containing hydraulic oil may also be PCB-containing. BC observed a pole-mounted transformer on the southeastern portion of the target property during the site reconnaissance. The transformer was not Phase I Environmental Site Assessment
Skelly, Hercules, Contra Costa County, California Executive Summary ES-2
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labeled regarding PCB content. No leakage of the transformer was observed at the time of the assessment. Transformers are owned by the local utility company, and they will typically respond to reported spills associated with their equipment.

Evidence of a former septic system was observed on the central portion of the target property.

Seventeen (17) structures were observed on the target property. The following table lists the structures on the target property. Figure 2 shows the locations and orientation of these structures.

Table 6-1. List of Structures
Structure Location Date Built
Hay barn Northern portion of the target property 1939
Stables Northern portion of the target property 1939
Horse stable Northern portion of the target property 1939 Work shed Central portion of the target property 1939
Residence Central portion of the target property 1939
Main residence Central portion of the target property 1939 Chicken coop Central portion of the target property 1939 Garage Central portion of the target property 1939
Shed Central portion of the target property 1939
Paddocks Eastern portion of the target property 1939
Shed Eastern portion of the target property 1939
Twin shed (east) Eastern portion of the target property 1939 Twin shed (west) Eastern portion of the target property 1939 Barn/Chicken coop Eastern portion of the target property 1939 Stables Southern portion of the target property 1993
Horse shelter Southern portion of the target property 1993 Horse shelter Southern portion of the target property 1993 The target property is bordered to the north by residential properties, beyond which are Rosti and Pavon. The target property is bordered to the east by residential properties and Skelly Road, beyond which is Pearce Road. The target property is bordered to the south by a railroad, a natural gas pipeline, a commercial property, and residential properties, beyond which is San Pablo Avenue. The target property is bordered to the west by residential properties and a walking trail, beyond which is Pinole Creek and residential properties.

BC’s site and area reconnaissance indicated no RECs to the target property.

Physical Setting
According to the United States Geological Survey (USGS) topographic map Mare Island, California dated 2012, the elevation of the target property is approximately 22 feet above mean sea level (amsl).

The target property is relatively flat terrain with a general topographic gradient to the west.

Phase I Environmental Site Assessment
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The depth to groundwater and information regarding the regional groundwater flow for wells located in the vicinity of the target property was not reported by Environmental Data Resources, Inc. (EDR).

The shallow hydrogeologic gradient flow is assumed to mimic the local topographic gradient in the vicinity of the target property, which is generally to the west. It should be noted that hydraulic gradient may vary with depth, regional groundwater flow direction, and be influenced by seasonal changes, geology, or local groundwater pumping patterns.

Records Review
BC identified no RECs resulting from the review of environmental regulatory or historical records reviews.

Interviews
BC conducted an interview with the DHI representative, Mr. Adam Foster, during this Phase I ESA.

Mr. Foster confirmed the target property boundaries and seller contact information. Mr. Foster also completed the User Questionnaire for the target property. Mr. Foster indicated that the purchase price of the target property reflected fair market value and that DHI is aware of no known issues at the target property that may present environmental concern.

BC conducted an interview with the seller site contact, Mr. Ron Kooyman, the property broker for the seller, Saranell McLeod, about the current and past uses of the target property during this site reconnaissance. Mr. Kooyman stated he has been familiar with the property since 1990. To the best of his knowledge, he stated that the target property currently has an old water aboveground storage tank (AST) that had been disconnected, a septic system, and several structures. Mr. Kooyman stated the target property did not have a water well, gravesite or cemetery, or pipeline on the target property.

Mr. Kooyman was aware of a previous environmental assessment that was performed by BC for the target property.

The results of these interviews identified no RECs or environmental risks regarding current or past operations at the target property.

Findings, Opinions, and Conclusions
BC performed this assessment in general conformance with the scope and limitations of the ASTM International (ASTM) Standard E 1527-13 for the target property identified above to identify any RECs in connection with the target property, including the presence, or likely presence, of any hazardous substances or petroleum products on the target property under conditions that indicate an existing release, or past release, or a material threat of release into the ground, groundwater, surface water, or structures on the target property. This assessment included an evaluation to the extent practicable of the past and present land uses at the target property and on adjacent properties.

The results of this assessment have identified no evidence of on-site or off-site RECs.

No further assessment of the target property is recommended at this time.

BC requests notification for further discussion or evaluation of any new conditions discovered during the development of the target property.

This executive summary is presented for convenience only. While the executive summary is an integral part of the report, it should not be used in lieu of reading the entire report, including the appendices. 1-1
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Section 1
Introduction

1.1 Purpose
D.R. Horton, Inc. (DHI) has retained Brown and Caldwell (BC) to perform a Phase I Environmental Site Assessment (ESA) for the property located at 215 Skelly in Hercules, Contra Costa County, California 94547 (target property). The target property consists of 7.3 acres of partially developed land with multiple structures including a residence, barns, and other outbuildings. DHI stated that the specific reason for this Phase I ESA was to evaluate environmental conditions at the target property in support of the potential purchase of the target property. This Phase I ESA is intended to serve as an appropriate, commercially prudent, and reasonable inquiry regarding the potential for recognized environmental conditions (RECs) in connection with the target property. This Phase I ESA report is intended to satisfy “all appropriate inquiry” into the previous ownership and uses of the target property as defined under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) at Title 42 of the United States Code (U.S.C.) §9601(35)(B) and in accordance with 40 CFR Part 312, Standards and Practices for All Appropriate Inquiries; Final Rule (AAI Rule).

1.2 Scope of Services
Based on the requirements presented in the American Society for Testing and Materials (ASTM) Standard Practice E 1527-13 (ASTM E 1527-13), BC performed the following tasks as part of this Phase I ESA. At DHI’s request, the scope of services included the following considerations to provide them with a baseline evaluation of the environmental conditions at the target property. • Task 1 − Records Review. Obtained and reviewed records that identified potential RECs, historical RECs (HRECs), controlled RECs (CRECs), or de minimis conditions in connection with the target property. The minimum search distance (msd) followed ASTM E 1527-13 recommendations for standard and additional environmental record sources with the exception that State and municipal solid waste facilities will be extended to 1 mile. This may include a review of the target property’s deed of record to identify environmental liens that may have been recorded for the target property. A 50-year Chain-of-Title report was reviewed as applicable, if provided by DHI.
• Task 2 − Site Reconnaissance. Conducted a site reconnaissance to determine the potential that a REC was present at the target property. Also, observed neighboring properties, to the degree possible, for land uses or other aspects that indicated potential RECs that could adversely affect the target property.
• Task 3 − Interviews. Interviewed individuals with knowledge of the target property to obtain information regarding the potential for RECs, HRECs, CRECs, or de minimis conditions. • Task 4 − Evaluation and Report Preparation. BC prepared this report detailing the findings associated with each of the above-listed tasks.

1.3 Limiting Conditions
This Phase I ESA report has been prepared for the exclusive use of the DHI and their assigns, in accordance with the standards of the environmental consulting industry at the time the services were Phase I Environmental Site Assessment
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performed, and in general accordance with the agreement between DHI and BC dated March 11, 2014. This work has been performed for the sole purpose of assisting in the evaluation of RECs associated with the target property. This Phase I ESA report is governed by the specific scope of work authorized by DHI and is not intended to be relied upon by any other party. The findings presented herein are based upon observations of target property conditions as of the date the assessment was performed and a review of reasonably ascertainable standard records sources. The findings and conclusions presented herein should not be assumed to apply to conditions or operating practices on this property occurring subsequent to BC’s actual site reconnaissance.

The findings of the Phase I ESA, as represented within this report, must be viewed in recognition of certain limiting conditions. The scope of work commissioned for this project does not represent an exhaustive study, but rather a reasonable inquiry, consistent with good commercial practice, in general accordance with ASTM E 1527-13. In the course of this assessment, BC has relied on information provided by outside parties, such as regulatory agencies and interview sources. BC has made no independent investigation as to the validity, completeness, or accuracy of such information provided by third-party sources. For the purposes of this assessment, such third-party information is assumed to be accurate unless contradictory evidence is noted, and BC does not express or imply any warranty regarding information provided by third-party sources. This Phase I ESA report makes no representation that environmental contamination does not exist at this target property beyond that described in this report.

In the following paragraphs italicized terms refer to specific definitions set forth in Section 3.2 of the ASTM Standard. The purpose of this Phase I ESA is to identify, to the extent feasible, pursuant to the scope and limitation of the guidelines set forth in the ASTM E 1527-13, RECs, HRECs, CRECs, or de minimis conditions in connection with the target property.

The term REC is defined by ASTM E 1527-13 as:

The presence or likely presence of any hazardous substances or petroleum products in, on, or at the property: (1) due to release to the environment; (2) under conditions indicative of a release to the environment; or (3) under conditions that pose a material threat of a future release to the environment. De minimis conditions are not recognized environmental conditions.

The term HREC is defined by ASTM E 1527-13 as:

A past release of any hazardous substances or petroleum products that has occurred in connection with the property and has been addressed to the satisfaction of the applicable regulatory authority or meeting unrestricted use criteria established by a regulatory authority, without subjecting the property to any required controls (for example, property use restriction, activity and use limitations, institutional control, or engineering controls). Before calling the past release a historical recognized environmental condition, the environmental professional must determine whether the past release is a recognized environmental condition at the time the Phase I Environmental Site Assessment is conducted (for example, if there has been a change in the regulatory criteria). If the EP considers the past release, to be a recognized environmental condition at the time the Phase I ESA is conducted, the condition shall be included in the conclusions section of the report as a recognized environmental condition.

The term CREC is defined by ASTM E 1527-13 as:

A recognized environmental condition resulting from a past release of hazardous substances or petroleum products that has been addressed to the satisfaction of the Phase I Environmental Site Assessment
Skelly, Hercules, Contra Costa County, California Section 1 1-3
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applicable regulatory authority (for example, as evidenced by the issuance of a no further action letter or equivalent, or meeting risk-based criteria established by regulatory authority), with hazardous substance or petroleum products allowed to remain in place subject to the implementation of required controls (for example, property use restrictions, activity and use limitations, institutional controls, or engineering controls). A condition considered by the environmental professional to be a controlled recognized environmental condition shall be listed in the findings section of the Phase I Environmental Site Assessment report, and as a recognized environmental condition in the conclusions section of the Phase I Environmental Site Assessment report.

The term de minimis condition is defined by ASTM E 1527-13 as:

A condition that generally does not present a threat to human health or the environment and that generally would not be the subject of an enforcement action if brought to the attention of appropriate governmental agencies. Conditions determined to be de minimis conditions are not recognized environmental conditions or controlled recognized environmental conditions.

The term reasonably ascertainable is defined by ASTM E 1527-13 as:

Information that is publicly available to anyone upon request, obtainable from its source within reasonable time and cost constraints, and practically reviewable.

The term practically reviewable is defined by ASTM E 1527-13 as:

Information is provided by the source in a manner and in a form that, upon examination, yields information relevant to the property without the need for extraordinary analysis of irrelevant data. The form of the information shall be such that the user can review the records for a limited geographic area. Records that cannot be feasibly retrieved by reference to the location of the property or a geographic area in which the property is located are not generally practically reviewable.

Reasonable time and cost means that the information will be provided by the source within 20 calendar days of receiving a written, telephone, or in-person request at no more than a nominal cost intended to cover the source’s cost of retrieving and duplicating the information.

1.4 Exceptions or Deviations from Standard
Exceptions or deviations for this assessment include the following:
• An Environmental LienSearch was not conducted as part of this assessment. DHI conducts title history research as part of their site acquisition process. BC concludes that information obtained through an Environmental LienSearch would not materially alter the conclusions or recommendations of this report.
• The msd for State and municipal solid waste facilities in Section 4.4 was extended to 2 miles. 2-1
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Section 2
User Provided Information
The ‘User’ is the party seeking to use ASTM E 1527-13 to complete an ESA of the target property. The User has specific obligations for completing a successful application of the Practice.

BC obtained a completed ASTM User Questionnaire from DHI. A copy of the completed form is included in Appendix F. The following summarizes the information provided to BC regarding the target property.

2.1 Reason for Performing Phase I ESA
DHI informed BC that the specific reason for this Phase I ESA was to evaluate the potential for RECs at the target property in support of the acquisition of the target property. This Phase I ESA is, therefore, intended to serve as an appropriate, commercially prudent, and reasonable inquiry regarding the potential for RECs in connection with the target property. This report will provide DHI an “all appropriate inquiry” into the previous ownership and uses of the target property defined under the CERCLA Title 42 of the U.S.C. §9601(35)(B), as clarified by the AAI Rule.

2.2 Commonly Known or Reasonably Ascertainable Information Mr. Adam Foster of DHI completed the User Questionnaire and is aware of the previous uses of the target property as a residential property.

2.3 Property Value Comparison to Purchase Price
Mr. Foster reported to BC in the User Questionnaire that the anticipated purchase or lease price of the target property is comparable to the assessed property value. Therefore, this information appears to indicate that the price has not been lowered as a result of potential environmental concerns and/or contamination at the target property.

2.4 Specialized Knowledge
In the User Questionnaire, Mr. Foster indicated that he was aware of no specialized knowledge regarding environmental conditions at the target property.

2.5 Title Records
At DHI’s request, BC was not requested to obtain title records since these documents are obtained by the Client. The records will be provided to BC, if needed.

2.6 Environmental Liens or Activity and Use Limitations DHI conducts title history research as part of their site acquisition process which would identify an environmental lien and will provide BC any information regarding environmental liens or activity use limitations, if identified. In the User Questionnaire, Mr. Foster indicated that he was unaware of any environmental liens or activity and use limitations (AULs) at the target property.

Phase I Environmental Site Assessment
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2.7 Owner, Property Manager, or Occupant Information
DHI personnel indicated that Saranell McLeod is currently selling the target property. The contact information for the target property is as follows:
• Mr. Ron Kooyman
Property Broker
Phone: (925) 285-4895
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Section 3
Site Physical Setting Overview

3.1 Location
The target property is located at 215 Skelly in Hercules, Contra Costa County, California 94547 (target property). See Figure 1 for a Vicinity Map.

Target Property Address: The property is addressed as 215 Skelly, Hercules, Contra Costa County, California 94547. Access to the target property is from the east via Skelly and the northwest via Rosti.

Property Uses in Surrounding Area: The area surrounding the target property contains residential and commercial property in the immediate vicinity.

3.2 Current Ownership
According to information provided by DHI, the current owner of the target property is Saranell McLeod.

According to the Contra Costa County Tax Assessor’s office, the property is listed as Assessor’s Parcel Number (APN) 404-020-012-5.

3.3 Physical Characteristics

3.3.1 Physical Features and Topography
Approximate Size of Target Property: 7.3 acres
Approximate Shape of Target Property: Irregular
Target Property Topography: According to the United States Geological Survey (USGS) topographic map Mare Island, California dated 2012, the target property is located on relatively flat terrain with a general topographic gradient to the west. Please refer to Figure 4, Topographic Map.

Regional Surface Topography: According to the Mare Island, California map, regional surface topography appears to be toward the west.

Approximate Elevation of Target Property: According to the Environmental Data Resources, Inc. (EDR) Report, surface elevation for the target property is approximately 22 feet above mean sea level (amsl).

Surface Drainage on the Target Property: The general flow direction of surface stormwater across the target property appears to be toward the west.

3.3.2 Geology and Hydrology
General Regional Geology: According to the EDR Report, the target property appeared to be in the Stratified Sequence of the Cenozoic Era, Tertiary System, and Miocene Series.

Soil Conditions: According to the Soil Conservation Service information provided in the EDR Report, there are three (3) soil components at the target property. The first soil component at the target property is Lodo. The soil surface texture is clay loam and noted to be a somewhat excessively drained class of soils. Lodo soils have a reported moderate corrosion potential to uncoated steel and are considered not hydric. From 0 to 18 inches, Lodo soils are clay loam. From 18 to 22 inches, the soils are unweathered bedrock.

Phase I Environmental Site Assessment
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The second soil component at the target property is Clear Lake. The soil surface texture is clay and noted to be a poorly drained class of soils. Clear Lake soils have a reported high corrosion potential to uncoated steel and are considered partially hydric. From 0 to 59 inches, Clear Lake soils are clay.

The third soil component at the target property is cut and fill land (fill part). The soil surface texture is silty clay loam, and the soil drainage class was not reported. Cut and fill land (fill part) soils have a reported moderate corrosion potential to uncoated steel and are considered not hydric. From 0 to 59 inches, cut and fill land (fill part) soils are silty clay loam.

Approximate Depth and Flow Direction of Groundwater: The depth to groundwater and information regarding the regional groundwater flow for wells located in the vicinity of the target property was not reported by EDR. The shallow hydrogeologic gradient flow is assumed to mimic the local topographic gradient in the vicinity of the target property, which is generally to the west. It should be noted that hydraulic gradient may vary with depth, regional groundwater flow direction, and be influenced by seasonal changes, geology, or local groundwater pumping patterns.

Regional Groundwater Conditions: Based on review of hydrogeologic data provided in the EDR Report, there are no federal water wells, no federal public water supply systems, and 18 state water wells located within 1.0 mile of the target property. No water wells appear to be located on the target property.
4-1
Privileged and Confidential Attorney Work Product
Section 4
Records Review

4.1 Historical Use Information
BC reviewed reasonably ascertainable standard historical sources in an attempt to develop a history of the previous uses or occupancies of the target property and surrounding area. The objective was to identify those uses or occupancies that were likely to have led to RECs, CRECs, or HRECs in connection with the target property. BC attempted to identify uses or occupancies of the target property dating from the present back to when the property was first developed or dating to at least 1940. These sources and findings are summarized below.

BC’s review of historical aerial photographs (1939, 1946, 1950, 1958, 1963, 1968, 1974, 1982, 1993, 1998, 2005, 2009, 2012, and 2016) provided by EDR identified no RECs to the target property.

The target property was shown as partially developed land with structures in the 1939 through 1982 aerial photographs. In the 1993 aerial photograph, the target property is improved with additional structures.

Based on the review of readily available historical aerial photographs, the surrounding areas consisted primarily of partially developed land with a road and structures to the north; partially developed land with roads to the east; partially developed land with roads, structures, and a railroad to the south; and partially developed land with a creek, a road, and a railroad to the west of the target property in the 1939 aerial photograph. In the 1958 aerial photograph, the area west of the target property is improved with structures. In the 1963 aerial photograph, the area south of the target property is improved with additional structures. In the 1968 aerial photograph, the area southeast of the target property is improved with additional structures. In the 1974 aerial photograph, some of the structures in the area north of the target property are no longer present. In the 1982 aerial photograph, the structures in the area north of the target property are no longer present. In the 1993 aerial photograph, the areas north and east of the target property are improved with additional structures.

In the 1998 aerial photograph, the area south of the target property is improved with additional structures. BC identified no previous use of the adjoining properties that would represent a REC to the target property during the historical aerial photograph review.

BC’s review of historical topographic maps (1895, 1899, 1902, 1914/1915, 1916, 1947, 1949, 1951, 1959, 1968, 1973, 1980, 1995, 1996, and 2012) indicated that the target property was historically partially developed in 1902 and improved with structures in the 1914/1915 topographic map. Properties in the general vicinity of the target property included residential and commercial development. BC identified no previous use of the target property and/or adjoining properties that would represent an on-site or off-site REC during the historical topographic map review.

BC’s records review indicated the following RECs to the target property:

4.2 Vapor Encroachment Screening
BC performed a Tier 1 Vapor Encroachment Screening (VES) for the target property in accordance with ASTM Standard Guide E 2600-15. This VES was completed in conjunction with ASTM E 1527-13 for Phase I ESAs. The purpose of the VES was to identify vapor encroachment conditions (VECs) for the target property.

Phase I Environmental Site Assessment
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The term VEC is defined by ASTM (2015) as:

The presence or likely presence of contaminant vapors in the subsurface of the target property caused by the release of vapors from contaminated soil and/or groundwater either on or near the target property as identified by the Tier 1 or Tier 2 procedures in ASTM Standard Guide E 2600-15.

A Tier 1 VES identifies any known or suspect contaminated facilities with volatile or semi-volatile hazardous substances or petroleum products, referred to as chemicals of concern (COCs), within an area of concern (AOC). The AOC for non-petroleum hydrocarbon COCs is a 1,760-foot (1/3-mile) radius from the contaminated facility to the boundary of the target property. For facilities with petroleum hydrocarbon COCs, the AOC is a 528-foot (1/10-mile) radius. The AOC can be reduced if groundwater flow direction is known or inferred using approximate msd of a COC. A critical distance, the estimated linear distance in any direction in which COC vapors from contaminated groundwater or soil might migrate in the vadose zone to the target property, is 100 feet for non-petroleum hydrocarbon COCs and light non-aqueous phase liquid (LNAPL) petroleum hydrocarbon COCs. The critical distance for dissolved-phase petroleum hydrocarbons is 30 feet.

According to the EDR VES Report, 14 facilities were identified by EDR within the AOC for the target property. All facilities were eliminated as presenting a potential VEC due to distance, topographic location from the target property, or because there had been no documented soil or groundwater contamination. No facilities were identified as potential concerns to the target property. The EDR VES Report is provided in Appendix E.

4.3 Previous Investigations and Assessments
BC was provided with three (3) previous environmental reports for the target property to review. The findings of the previous reports are presented below.
• BC reviewed a Crime/Incident Report, dated March 11, 2020, by the Hercules Police Department. The report stated that there was a fire, potentially started by vandals, that burned a structure on the central portion of the target property that contained an old laundry room and kitchen. According to the owner, Mr. John McLeod, the main gas line had been turned off 2 months prior to the incident and the burned structure never had electrical issues. • BC reviewed a Phase I ESA report, dated April 6, 2020, by BC that was prepared for D.R. Horton.

At the time of the report, the target property consisted of partially developed land and remnants from a ranch. Historically, the target property contained partially developed land with structures. Based on the findings of the report, BC concluded that there were no RECs at the target property.
• BC reviewed a Site Reconnaissance report, dated March 3, 2021, by BC that was prepared for D.R. Horton. At the time of the report, the target property consisted of partially developed land with multiple structures including a residence, barns, and other outbuildings. Historically, the target property contained partially developed land with structures. Based on the findings of the report, BC concluded that there were no RECs at the target property.

4.4 Standard Environmental Regulatory Record Sources
The purpose of the records review is to obtain and review reasonably ascertainable records that will help identify RECs, CRECs, or HRECs in connection with the target property. The EDR Report with a complete listing is included in Appendix C. Results of the search of the various applicable government agencies by EDR resulted in 53 facilities within the msd of the target property. The facilities identified in the EDR Report were listed in the following databases:

Phase I Environmental Site Assessment
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• Resource Conservation and Recovery Act - Small Quantity Generators (RCRA-SQG): RCRAInfo is the EPA’s comprehensive information system, providing access to data supporting the RCRA of 1976 and the Hazardous and Solid Waste Amendments (HSWA) of 1984. The database includes selective information on sites which generate, transport, store, treat, and/or dispose of hazardous waste as defined by the RCRA. SQGs generate between 100 kilograms (kg) and 1,000 kg of hazardous waste, or less than 1 kg of acutely hazardous waste per month. • Resource Conservation and Recovery Act - Large Quantity Generators (RCRA-LQG): RCRAInfo is the EPA’s comprehensive information system, providing access to data supporting the RCRA of 1976 and the HSWA of 1984. The database includes selective information on sites which generate, transport, store, treat, and/or dispose of hazardous waste as defined by the RCRA.

LQGs generate more than 1,000 kg of hazardous waste, or more than 1 kg of acutely hazardous waste per month.
• Leaking Underground Storage Tanks (LUST): The LUST list contains an inventory of reported LUST incidents.
• Historical Underground Storage Tanks (HIST UST): This database is no longer updated by the agency. It contains records and detail fields that the current UST database does not. • School Property Evaluation Program (SCH): Proposed and existing school sites that are being evaluated by Department of Toxic Substances Control (DTSC) for possible hazardous materials contamination.
• Statewide Environmental Evaluation and Planning System UST (SWEEPS UST): This UST listing was updated and maintained by a company contacted by the State Water Resource Control Board (SWRCB) in the early 1990s. The listing is no longer updated or maintained. The local agency is the contact for more information on a site on the SWEEPS list. • National Pollutant Discharge Elimination System (NPDES): The NPDES permit program controls water pollution by regulating point sources that discharge pollutants into waters of the United States.
• California Integrated Water Quality System (CIWQS): The CIWQS is a computer system used by the State and Regional Water Quality Control Boards to track information about places of environmental interest, manage permits and other orders, track inspections, and manage violations and enforcement activities.
• California Environmental Reporting System Tanks (CERS TANKS): List of sites in the California Environmental Protection Agency (CalEPA) Regulated Site Portal which fall under the Aboveground Petroleum Storage and Underground Storage Tank (UST) regulatory programs. • DRYCLEANERS: This database maintains registration of drycleaning facilities. • Cortese Hazardous Waste & Substances Sites List (Cortese): The sites for the list are designated by the State Water Resource Control Board (LUST), the Integrated Waste Board solid waste facility/landfill (SWF/LS), and the DTSC (Cal-Sites). • Superfund Enterprise Management System Archive (SEMS-ARCHIVE): Tracks sites that have no further interest under Federal Superfund Program based on available information. The list was formerly known as the Comprehensive Environmental Response, Compensation, and Liability Information System – No Further Remedial Action Planned (CERCLIS-NFRAP), renamed as SEMS ARCHIVE by the EPA in 2015. The EPA may perform a minimal level of assessment work at a site while it is archived if site conditions change and/or new information becomes available. Archived sites have been removed and archived from the inventory of SEMS sites. Archived status indicates that, to the best of the EPA’s knowledge, assessment at a site has been completed and that the EPA has determined no further steps will be taken Phase I Environmental Site Assessment
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to list the site on the National Priorities List (NPL), unless information indicates this decision was not appropriate or other considerations require a recommendation for listing at a later time. The decision does not necessarily mean that there is no hazard associated with a given site; it only means that, based upon available information, the location is not judged to be potential NPL site.
• Polychlorinated Biphenyl (PCB) Activity Database System (PADS): Identifies generators, transporters, commercial storers, and/or brokers and disposers of PCBs who are required to notify the EPA of such activities.
• California Hazardous Material Incident Report System (CHMIRS): CHMIRS contains information on reported hazardous material incidents (accidental releases or spills). • Environmental Liens Listing (LIENS): A listing of property locations with environmental liens for California where DTSC is a lien holder.
• CONTRA COSTA CO. SITE LIST: List includes sites from the underground tank, hazardous waste generator, and business plan/2185 programs.
• Underground Storage Tanks (UST): USTs are regulated under Subtitle I of RCRA and are registered with the state department responsible for administering the UST program. • Facility Index System/Facility Registry System (FINDS): FINDS contains both facility information and ’pointers’ to other sources that contain more detail. EDR includes the following FINDS databases in this report: PCS (Permit Compliance System), AIRS (Aerometric Information Retrieval System), DOCKET (Enforcement Docket used to manage and track information on civil judicial enforcement cases for all environmental statutes), FURS (Federal Underground Injection Control), C-DOCKET (Criminal Docket System used to track criminal enforcement actions for all environmental statutes), FFIS (Federal Facilities Information System), STATE (State Environmental Laws and Statutes), and PADS (PCB Activity Data System).
• EDR Hist Auto: EDR has searched selected national collections of business directories and has collected listings of potential gas station/filling station/service station sites that were available to EDR researchers. EDR’s review was limited to those categories of sources that might, in EDR’s opinion, include gas station/filling station/service station establishments. The categories reviewed included, but were not limited to, gas, gas station, gasoline station, filling station, auto, automobile repair, auto service station, service station, etc. This database falls within a category of information EDR classifies as “High Risk Historical Records”, or HRHRs.

EDR’s HRHR effort presents unique and sometimes proprietary data about past sites and operations that typically create environmental concerns but may not show up in current government records searches.
• Enforcement (ENF): Database of any entries related to administration, permits, inspections, and enforcement activities through the California State Water Resources Board. • Voluntary Cleanup Program (VCP): List of VCP sites.
• Environmental Compliance and History Online (ECHO): ECHO provides integrated compliance and enforcement information for about 800,000 regulated facilities nationwide. • Emissions Inventory Data (EMI): Toxics and criteria pollutant emissions data collected by the ARB and local air pollution agencies.
• Hazardous Waste Tracking System (HWTS): The DTSC's data repository for hazardous waste Identification (ID) numbers and manifest information. HWTS generates reports on hazardous waste shipments for generators, transporters, and TSDFs.

Phase I Environmental Site Assessment
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• CalEPA Regulated Site Portal Data (CERS): The CalEPA Regulated Site Portal database combines data about environmentally regulated sites and facilities in California into a single database. It combines data from a variety of state and federal databases and provides an overview of regulated activities across the spectrum of environmental programs for any given location in California. These activities include hazardous materials and waste, state, and federal cleanups, impacted ground and surface waters, and toxic materials. • CERS HAZ WASTE: List of sites in the CalEPA Regulated Site Portal which fall under the Hazardous Chemical Management, Hazardous Waste Onsite Treatment, Household Hazardous Waste Collection, Hazardous Waste Generator, and RCRA LQ HW Generator programs. • Hazardous Waste & Substance Site List (HIST CORTESE): The sites for the list are designated by the State Water Resource Control Board [LUST], the Integrated Waste Board [SWF/LS], and the DTSC [CALSITES]. This listing is no longer updated by the state agency. • Calsites Database (HIST Cal-Sites): The Calsites database contains potential or confirmed hazardous substance release properties. In 1996, CalEPA reevaluated and significantly reduced the number of sites in the Calsites database. No longer updated by the state agency.

It has been replaced by ENVIROSTOR.
• Bond Expenditure Plan (CA BOND EXP. PLAN): Department of Health Services developed a site-specific expenditure plan as the basis for an appropriation of Hazardous Substance Cleanup Bond Act funds. It is not updated.
• Statewide SLIC Cases (GEOTRACKER) (CPS-SLIC:): Cleanup Program Sites (CPS; also known as Site Cleanups [SC] and formerly known as Spills, Leaks, Investigations, and Cleanups [SLIC] sites) included in GeoTracker. GeoTracker is the Water Boards data management system for sites that impact, or have the potential to impact, water quality in California, with emphasis on groundwater.
• Non-Case Information Sites (GEOTRACKER) (NON-CASE INFO): Non-Case Information sites. • RESPONSE: Identifies confirmed release sites where DTSC is involved in remediation, either in a lead or oversight capacity. These confirmed release sites are generally high-priority and high potential risk.
• ENVIROSTOR: The DTSC’s Site Mitigation and Reuse Program (SMBRP) database of known contamination or sites for with there may be reasons to investigate further. • Deed Restriction Listing (DEED): Site mitigation and brownfields reuse program facility sites with deed restrictions and hazardous waste management program facility sites with deed/land use.
• SWF/LF: Solid Waste Information System Active, Closed and Inactive Landfills. SWF/LF records typically contain an inventory of solid waste disposal facilities or landfills. These may be active or inactive facilities or open dumps that failed to meet RCRA Section 4004 criteria for solid waste landfills or disposal sites.
• CERS HAZ WASTE: CERS HAZ WASTE List of sites in the CalEPA Regulated Site Portal which fall under the Hazardous Chemical Management, Hazardous Waste Onsite Treatment, Household Hazardous Waste Collection, Hazardous Waste Generator, and RCRA LQ HW Generator programs.
• EMI: Emissions Inventory Data. Toxics and criteria pollutant emissions data collected by the ARB and local air pollution agencies.
• DRYCLEANERS: Cleaner Facilities. A list of drycleaner related facilities that have EPA ID numbers. These are facilities with certain SIC codes: power laundries, family and commercial; garment pressing and cleaner’s agents; linen supply; coin-operated laundries and cleaning; Phase I Environmental Site Assessment
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drycleaning plants, except rugs; carpet and upholstery cleaning; industrial launderers; laundry and garment services.
• SEMS: Superfund Enterprise Management System SEMS (Superfund Enterprise Management System) tracks hazardous waste sites, potentially hazardous waste sites, and remedial activities performed in support of EPA’s Superfund Program across the United States. The list was formerly known as CERCLIS, renamed to SEMS by the EPA in 2015. The list contains data on potentially hazardous waste sites that have been reported to the United States Environmental Protection Agency (USEPA) by states, municipalities, private companies, and private persons, pursuant to Section 103 of the CERCLA. This dataset also contains sites which are either proposed to or on the NPL and the sites which are in the screening and assessment phase for possible inclusion on the NPL.

The facilities identified in the EDR Report are discussed below. • Sarah McLeod/AT&T Mobility – Hercules Avenue and San Pablo (USID1035) (2 listings) 215 Skelly/215 Skelly Road
Distance: Target Property
Direction: Target Property
Database listed on: HWTS, CONTRA COSTA CO. SITE LIST, and CERS Information in the above listed databases indicates that this facility handled hazardous waste in 2008. This facility currently stores hazardous materials at the cellphone tower on the property that is owned by AT&T Mobility – Hercules Avenue and San Pablo (USID103583) with no reported violations or releases. Based on regulatory status, this listing does not represent a REC to the target property.
• Pacific Refining Wharf / Pacific Refining Company (2 listings) Lat_122_16_15 West / Old Highway 40
Distance: 101 feet
Direction: East
Database listed on: RCRA-SQG and HIST UST
Topographic Relationship: Upgradient
Information in the RCRA-SQG databases indicates that this facility is an SQG of hazardous waste. Information in the HIST UST database indicates that this facility installed an unleaded gasoline UST in 1966. Based on regulatory status, this facility does not represent a REC to the target property.
• Square Deal Garage
2500 San Pablo Avenue
Distance: 499 feet
Direction: South
Database listed on: RCRA-SQG, LUST, CERS HAZ WASTE, FINDS, ECHO, HIST CORTESE, CONTRA COSTA CO. SITE LIST, and CERS
Topographic Relationship: Cross-gradient
Information in the above listed databases indicates this facility is a SQG of hazardous waste.

Information in the LUST database indicates that this facility experienced a leak from a gasoline UST during tank closure in February 1992 that contaminated the soil and groundwater. The spill was cleaned up and the case was closed in July 2015. Information in the CERS database Phase I Environmental Site Assessment
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indicates that this facility has had multiple violations concerning petroleum storage between 2014 and 2019. Based on topographic relationship and regulatory status, this facility does not represent a REC to the target property.
• OCU-Ease Optical Products
629 Tennant Avenue
Distance: 739 feet
Direction: South-Southwest
Database listed on: CONTRA COSTA CO. SITE LIST
Topographic Relationship: Cross-gradient
Information in the above listed database indicates that this facility generates less than 5 tons of waste per year. Based on topographic relationship and regulatory status, this facility does not represent a REC to the target property.
• Pacific Cell
636 Tennent Avenue
Distance: 836 feet
Direction: Southwest
Database listed on: RCRA-LQG, FINDS, and ECHO
Topographic Relationship: Cross-gradient
Information in the above-listed databases indicates this facility is a verified large quantity generator of hazardous waste with no reported violations or releases. Based on topographic relationship and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.
• Harold Richmond / Jacksons Shell / Shell Oil Company (3 listings) 2301 San Pablo Avenue / 2301 San Pablo Avenue and Tennant Avenue Distance: 972 feet
Direction: South-Southwest
Database listed on: HIST UST, EDR Hist Auto, RCRA-SQG, LUST, SWEEPS UST, ENF, HIST CORTESE, CONTRA COSTA CO. SITE LIST, and CERS
Topographic Relationship: Cross-gradient
Information in the HIST UST database indicates that this facility installed a premium gasoline UST, an unleaded gasoline UST, and a regular gasoline in 1980. Information in the EDR Hist Auto database indicates that this facility was listed as a gasoline service station from 1969 to 1980, 1982 to 1983, 1985 to 1999, and 2006 to 2012. Information in the RCRA-SQG, HIST CORTESE, CONTRA COSTA CO. SITE LIST, and CERS databases indicates that this facility is an SQG of hazardous waste. Information in the LUST database indicates that this facility discovered a gasoline, other solvent, or non-petroleum hydrocarbon leak in 1988 during a tank closure. The site was remediated, and the case was deemed completed and closed in 2007.

Information in the SWEEPS UST and ENF databases indicates that this facility has four (4) 10,000-gallon premium unleaded USTs, two (2) 10,000-gallon regular unleaded USTs, and a 550-gallon waste oil UST. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property.

Phase I Environmental Site Assessment
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Privileged and Confidential Attorney Work Product
• Ye Old Pump House (Chevron) / Stacy’s Chevron / Pump House (3 listings) 700 Tennent Avenue
Distance: 1,106 feet
Direction: South-Southwest
Database listed on: HIST UST, CERS TANKS, CONTRA COSTA CO. SITE LIST, CERS, EDR Hist Auto, UST, and SWEEPS UST
Topographic Relationship: Cross-gradient
Information in the HIST UST, CERS TANKS, CONTRA COSTA CO. SITE LIST, and CERS databases indicates that this facility installed a 5,000-gallon regular gasoline UST, a 2,000-gallon unleaded gasoline UST, and a 6,000-gallon unleaded UST in 1976 and has a number of violations relating to proper training of their staff in the case of emergency response training for hazardous materials. Information in the EDR Hist Auto database indicates that this facility was listed as a gasoline service station from 1969 to 1970 and from 1972 to 1980; and was listed as a liquor store from 1996 to 2011 and from 2013 to 2014. Information in the UST and SWEEPS UST databases indicates that this facility installed two (2) 5,500-gallon premium unleaded USTs in 1994, a 10,500-gallon regular unleaded UST, three (3) 5,000-gallon unleaded plus gasoline USTs, a 2,000-gallon premium unleaded UST, and a 6,000-gallon regular unleaded UST. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property. • R R & H Paving & Grading
440 Buena Vista
Distance: 1,118 feet
Direction: West-Southwest
Database listed on: RCRA-SQG, FINDS, ECHO, and CONTRA COSTA CO. SITE LIST Topographic Relationship: Downgradient
Information in the above-listed databases indicates that this facility is an SQG. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property.
• California Theater
351 Railroad Avenue
Distance: 1,794 feet
Direction: Northwest
Database listed on: LUST, Cortese, and CERS
Topographic Relationship: Downgradient
Information in the above-listed databases indicates that this facility experienced a petroleum hydrocarbon fuel release in November 2010 and closed the case in February 2020. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property.

Phase I Environmental Site Assessment
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• Hercules Properties, Ltd. / Hercules Powder Company / Hercules Industrial Property (4 listings) 560 Railroad Avenue
Distance: 1,847 feet
Direction: Northwest
Database listed on: HIST Cal-Sites, CA BOND EXP. PLAN, HWTS, SEMS-ARCHIVE, RCRA-SQG, CPS-SLIC, NON-CASE INFO, RESPONSE, ENVIROSTOR, DEED, Cortese, HIST CORTESE, and CONTRA COSTA CO. SITE LIST
Topographic Relationship: Downgradient
Information in the HIST Cal-Sites, CA BOND EXP. PLAN, HWTS, SEMS-ARCHIVE, CPS-SLIC, NONCASE INFO, RESPONSE, ENVIROSTOR, DEED, Cortese, HIST CORTESE, and CONTRA COSTA CO.

SITE LIST databases indicates that this facility was once a portion of a munitions and fertilizer manufacturing facility from the late 1800s to late 1970s that has since been demolished and cleaned up. The facility has restricted usage allowing only industrial or commercial uses and is currently listed as an Informational Item. Information in the RCRA-SQG database indicates that this facility is an SQG. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property. • Blue Sky Sports
1736 San Pablo Avenue
Distance: 2,268 feet
Direction: Southwest
Database listed on: SEMS
Topographic Relationship: Downgradient
Information in the above-listed database indicates this facility is not listed on the NPL as it is listed as a removal only site and no site assessment was needed. Based on distance, topographic relationship, and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.
• Unocal
1718 San Pablo Avenue
Distance: 2,393 feet
Direction: Southwest
Database listed on: LUST, SWEEPS UST, HIST UST, Cortese, HIST CORTESE, CONTRA COSTA CO. SITE LIST, and CERS
Topographic Relationship: Downgradient
Information in the above-listed databases indicates this facility had a leak underground of petroleum products that affected groundwater other than drinking water that was closed on March 21, 1997. This facility has a 10,000-gallon unleaded UST, a 550-gallonm waste oil UST, a 10,000-gallon premium products UST, and an unknown capacity waste UST. Based on distance, topographic relationship, and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.

Phase I Environmental Site Assessment
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• Centex Homes of California
Between I-80 and San Pablo Avenue
Distance: 2,560 feet
Direction: East
Database listed on: RESPONSE and ENVIROSTOR
Topographic Relationship: Upgradient
Information in the above-listed databases indicates this facility had three (3) phases of sampling completed for the property. It was found that soil was contaminated with lead products and 500 cubic yards of soil was removed from the site and remediation was completed on September 25, 1984. Based on distance and regulatory status/review of aerial photography, this facility does not represent a REC to the target property. • Hercules Inc
Corner of San Pablo and Sycamore Avenue
Distance: 2,725 feet
Direction: East-Northeast
Database listed on: RESPONSE, ENVIROSTOR, HIST Cal-Sites, DEED, Cortese, HOST CORTESE, and CERS
Topographic Relationship: Upgradient
Information in the above-listed databases indicates this facility was a former manufacturing plant and contamination of lead, copper, and nitrates were found on the property. Roughly 2,000 cubic yards were removed from the property. This facility has undergone remediation and all contaminated soil was removed to a landfill. Based on distance and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.
• Hercules Middle School
Sycamore Avenue/Willet Street
Distance: 2,989 feet
Direction: Northeast
Database listed on: ENVIROSTOR and SCH
Topographic Relationship: Cross-gradient
Information in the above-listed databases indicates this facility was investigated by the EPA and was found to have past use as sewage treatment plant for chemicals and have tanks for waste and treatment. This facility was issued a No Further Action (NFA) on April 26, 2011.

Based on distance, topographic relationship, and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.

Phase I Environmental Site Assessment
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• Kaiser Permanente Pinole Medical Office Building
1301 Pinole Valley Road
Distance: 3,211 feet
Direction: South-Southeast
Database listed on: RCRA-LQG
Topographic Relationship: Cross-gradient
Information in the above-listed database indicates this facility is a verified large quantity generator of hazardous waste with no reported violations or releases. Based on distance, topographic relationship, and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.
• Gelsar
San Pablo Avenue/Sycamore Avenue
Distance: 3,365 feet
Direction: East-Northeast
Database listed on: ENVIROSTOR, VCP, and Liens
Topographic Relationship: Upgradient
Information in the above-listed databases indicates this site was once a portion of the Hercules Powder Company which manufactured explosives and various munitions from about 1900 to 1960. In the early 1960s, all of the buildings and structures were demolished leaving some concrete foundation walls. Metal contaminants and residues from the explosive manufacturing activities (nitroaromatic compounds) were detected in soils. The contaminated areas were associated with remnants of the former structures. As of December 12, 2003, this facility was still listed in the VCP database. Based on distance, this facility does not represent a REC to the target property.
• Centex Home of California
I-80 and Sycamore
Distance: 4,193 feet
Direction: East-Northeast
Database listed on: HIST Cal-Sites
Topographic Relationship: Upgradient
Information in the above-listed database indicates this facility was once a portion of the Hercules Powder Company which manufactured explosives and various munitions from about 1900 to 1960. According to the Department of Toxic Substance Control this was facility is certified as having been remediated satisfactorily. Based on distance and regulatory status, this facility does not represent a REC to the target property.

Phase I Environmental Site Assessment
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Privileged and Confidential Attorney Work Product
• Pacific Bell
154 Sycamore Avenue
Distance: 4,507 feet
Direction: East
Database listed on: RCRA-LQG, LUST, CERS HAZ WASTE, SWEEPS UST, HIST UST, CERS TANKS, FINDS, ECHO, Cortese, EMI, HIST CORTESE, CONTRA COSTA CO. SITE LIST, and CERS Topographic Relationship: Upgradient
Information in the above-listed databases indicates this facility is a verified large quantity generator of hazardous waste. This facility had a leak underground of products that affected groundwater other than drinking water uses. This facility cleanup was completed and considered closed on March 21, 1997. This facility had a 4,000-gallon diesel UST. Based on distance and regulatory status/review of aerial photography, this facility does not represent a REC to the target property.
• 94014
2695 Pinole Valley Road
Distance: 4,568 feet
Direction: South-Southeast
Database listed on: RCRA-LQG
Topographic Relationship: Cross-gradient
Information in the above-listed database indicates this facility is a verified large quantity generator of hazardous waste with no reported violations or releases. Based on distance, topographic relationship, and regulatory status, this facility does not represent a REC to the target property.
• Mercury Dry Cleaner/Mercury Dry Cleaners (2 listings) 2714 Pinole Valley Road
Distance: 4,577 feet
Direction: South-Southeast
Database listed on: SEMS-ARCHIVE, CPS-SLIC, NON-CASE INFO, ENVIROSTOR, VCP, DEED, and EMI
Topographic Relationship: Cross-gradient
Information in the above-listed databases indicates this facility is a part of the VCP database due to the historic use as a dry cleaner and was giving to the Department of Toxic Substances Control. It was found that this facility had contamination of chlorinated hydrocarbons and tetrachloroethylene This facility is currently undergoing remediation as of the last update on April 9, 2008. Based on distance and topographic relationship, this facility does not represent a REC to the target property.

The remaining facilities are located greater than 4,600 feet from the target property and/or at topographically downgradient/cross-gradient locations; therefore, these facilities do not represent a REC to the target property.

4.5 Orphan Summary
The orphan or unmapped site list consists of sites currently listed in Federal or State databases that have inadequate address information. However, if street addresses are available, the site locations Phase I Environmental Site Assessment
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are checked against the known location of the target property to determine their relative location to the minimum ASTM search distance from the target property. The EDR Orphan Summary identified a total of two (2) orphan sites with a poor or unconfirmed address, or business listing that may be in proximity to the target property. The target property was not identified on the orphan sites summary list provided by EDR. None of the orphan sites were observed near the target property during the site reconnaissance.

4.6 Additional Environmental Record Sources
Additional sources of records that were reviewed for this assessment are briefly discussed below.

4.6.1 Local Fire Department
BC contacted the Hercules Fire Department regarding hazardous materials incidents, fires, or hazardous materials storage permits at the target property. At the time of report production, a response had not been received. Should information be received which alters the conclusions of this report, DHI shall be immediately notified, and an addendum will be prepared.

4.6.2 Department of Health/Environmental Division
BC contacted the Contra Costa County Environmental Health Department regarding incidents of environmental concern at the target property. According to the Contra Costa County Environmental Health Department, no spills or other environmental issues have been reported for the target property.

4.6.3 Building Permit/Inspection Department
BC contacted the Contra Costa County Department of Conservation and Development regarding incidents of environmental concern at the target property. According to the Contra Costa County Department of Conservation and Development, a septic tank was identified on the target property. 5-1
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Section 5
Interviews
The purpose of interviews is to obtain information indicating RECs, CRECs, or HRECs in connection with the target property, as described in ASTM E 1527-13. Selected individuals who were knowledgeable about current and past site operations were interviewed. The following is a brief summary of the information obtained about the target property.

5.1 Interviews with Owners, Occupants, and Others Knowledgeable of the Target Property
BC conducted an interview with the DHI representative, Mr. Adam Foster, during this Phase I ESA.

Mr. Foster confirmed the target property boundaries and seller contact information. Mr. Foster indicated that the purchase price of the target property reflected fair market value and that DHI is aware of no known issues at the target property that may present environmental concern.

Mr. Kooyman was aware of a previous environmental assessment that was performed by BC for the target property.

The results of these interviews identified no RECs or environmental risks regarding current or past operations at the target property.
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Section 6
Site and Area Reconnaissance

6.1 Methodology and Limiting Conditions
The site and area reconnaissance was performed to identify obvious visual indications of present or past activities that have or could have contaminated the target property. The site reconnaissance was conducted on foot, unless otherwise noted, by Kaitlin Tanel of BC on December 22, 2021. Maps, which illustrate the general location and configuration of the target property, are presented as Figures 1 and 2, respectively. Site and area reconnaissance photographs are provided in Appendix B.

6.2 Site Reconnaissance
BC understands that DHI is under contract to purchase 7.3 acres of partially developed land with multiple structures including a residence, barns, and other outbuildings. At the time of the site reconnaissance, the property consisted of partially developed land with multiple structures including a residence, barns, and other outbuildings. The surface was relatively flat terrain. Asphalt roadways without curbs and gutters and unpaved, dirt roadways were present onsite. Utilities, including water and electricity were observed on the property.

An overhead power transmission line is located on the southern portion of the target property, oriented northwest to southeast.

A burned area with a burned outbuilding and materials from a recent fire is present on the central portion of the target property.

BC's site reconnaissance revealed evidence of solid waste on the northern, northwestern, central, southwestern, and southern portions of the target property in the form of debris/trash. Items observed included wheelbarrows, a separated truck, a diesel container, plastic, metal, appliances, a burned outbuilding, and materials, empty 55-gallon drums, a traffic cone, a dilapidated chicken coop, equipment, Conex containers, a storage unit, paint cans and buckets, structure debris, piping, a play structure, and a tire.

Electrical transformers are often a source of environmental concern due to the potential presence of PCB-containing cooling oils used in some units. Equipment containing hydraulic oil may also be PCB-containing. BC observed a pole-mounted transformer on the southeastern portion of the target property during the site reconnaissance. The transformer was not labeled regarding PCB content. No leakage of the transformer was observed at the time of the assessment. Transformers are owned by Phase I Environmental Site Assessment
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the local utility company, and they will typically respond to reported spills associated with their equipment.

Evidence of a former septic system was observed on the central portion of the target property.

Stained soil and pavement was observed on the target property during BC’s site reconnaissance. The stained soil and pavement was located on the central portion of the target property inside and around the garage. BC has determined that the staining is de minimis and does not present a REC to the target property.

Seventeen (17) structures were observed on the target property. The following table lists the structures on the target property. Figure 2 shows the locations and orientation of these structures.

Table 6-1. List of Structures
Structure Location Date Built
Hay barn Northern portion of the target property 1939
Stables Northern portion of the target property 1939
Horse stable Northern portion of the target property 1939 Work shed Central portion of the target property 1939
Residence Central portion of the target property 1939
Main residence Central portion of the target property 1939 Chicken coop Central portion of the target property 1939 Garage Central portion of the target property 1939
Shed Central portion of the target property 1939
Paddocks Eastern portion of the target property 1939
Shed Eastern portion of the target property 1939
Twin shed (east) Eastern portion of the target property 1939 Twin shed (west) Eastern portion of the target property 1939 Barn/Chicken coop Eastern portion of the target property 1939 Stables Southern portion of the target property 1993
Horse shelter Southern portion of the target property 1993 Horse shelter Southern portion of the target property 1993 The following table summarizes conditions observed on the target property. A discussion describing the significance of each observed condition listed and results of its evaluation with respect to the target property is presented above.

Table 6-2. Conditions Observed During Site Reconnaissance Underground Storage Tanks No
Aboveground Storage Tanks Yes
Hazardous Materials and Wastes Yes
Solid Waste Yes
Potential Polychlorinated Biphenyls Containing Equipment Yes Phase I Environmental Site Assessment
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Table 6-2. Conditions Observed During Site Reconnaissance Water Wells No
Wastewater Sewage Disposal/Septic Yes
Odors No
Pits, Ponds, Lagoons, and Other Surface Waters No
HVAC Yes
Staining and Corrosion No
Drains, Sumps, and Dry Wells No
Stained Soils or Pavements Yes
Stressed Vegetation No
Oil and Gas Wells / Mine Shafts No
Structures Yes

6.3 Area Reconnaissance
An area reconnaissance was performed to identify obvious visual indications of present or past activities that have or could have contaminated the target property. The area reconnaissance was conducted by automobile, and/or on foot, unless otherwise noted. The findings of the area reconnaissance are presented according to the geographic relationship to the target property.

6.3.1 North
The target property is bordered to the north by residential properties, beyond which are Rosti and Pavon.

6.3.2 East
The target property is bordered to the east by residential properties and Skelly Road, beyond which is Pearce Road.

6.3.3 South
The target property is bordered to the south by a railroad, a natural gas pipeline, a commercial property, and residential properties, beyond which is San Pablo Avenue.

6.3.4 West
The target property is bordered to the west by residential properties and a walking trail, beyond which is Pinole Creek and residential properties.
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Section 7
Findings, Opinions, and
Conclusions

7.1 Summary of Findings
BC performed this assessment in general conformance with the scope and limitations of the ASTM Standard E 1527-13 to identify any RECs in connection with the target property, including the presence, or likely presence, of any hazardous substances or petroleum products on the target property under conditions that indicate an existing release, or past release, or a material threat of release into the ground, groundwater, surface water, or structures on the target property. This assessment included an evaluation to the extent practicable of the past and present land uses at the target property and on adjacent properties.

7.2 Data Failures and Gaps
Through the course of this assessment, BC may have encountered data failures or data gaps. These failures or gaps, if any, are discussed below. The following provides the opinion of the Environmental Professional (EP) as to the significance of the data gaps in terms of defining RECs at the target property. Data failures may or may not be significant data gaps, and the discussion also provides information pertaining to whether the data failures resulted in significant data gaps.

7.2.1 Data Failures
Data failure is a failure to achieve the historical (property use) research objectives specified in the ASTM Standard Practice even after reviewing the eight standard historical sources that are reasonably ascertainable and likely to be useful. Data failure is one type of data gap. No data failure was encountered.

7.2.2 Data Gaps
A data gap is a lack of, or inability to obtain, information required by the ASTM Standard Practice, despite good faith efforts by the EP to gather such information. This could include any component of the Practice, e.g., standard environmental records, interviews, or a complete reconnaissance. A data gap by itself is not inherently significant, but if other information and/or the EP’s experience raises reasonable concerns about the gap, it may be judged to be significant. Data gaps for this assessment include the following:
• Time gaps of more than five years were noted in available historical information. BC does not believe that this deviation precludes the ability to render an opinion regarding potential RECs or de minimis conditions for the target property or the conclusions or recommendations of this report.
• A search was not conducted for environmental liens as required under ASTM E 1527-13. DHI conducts title history research as part of their site acquisition process. BC does not believe that this deviation precludes the ability to render an opinion regarding potential RECs or de Phase I Environmental Site Assessment
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minimis conditions for the target property or the conclusions or recommendations of this report.
• BC contacted the Hercules Fire Department regarding hazardous materials incidents, fires, or hazardous materials storage permits at the target property. At the time of report production, a response had not been received. BC does not believe that this deviation precludes the ability to render an opinion regarding potential RECs or de minimis conditions for the target property or the conclusions or recommendations of this report.

In summary, BC concludes that none of the above-identified data gaps are likely to alter the conclusions or concentrations of this report.

7.3 Conclusions and Recommendations
The results of this assessment have identified no evidence of on-site or off-site RECs.

No further assessment of the target property is recommended at this time.

BC requests notification for further discussion or evaluation of any new conditions discovered during the development of the target property.

Phase I Environmental Site Assessment
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7.4 Environmental Professional’s Statement and Signature I declare that, to the best of my professional knowledge and belief, I meet the definition of Environmental Professional as defined in §312.10 of 40 CFR 312. I have the specific qualifications based on education, training, and experience to assess a property of the nature, history, and setting of the subject property. I have developed and performed all appropriate inquiries in conformance with the standards and practices set forth in 40 CFR 312.

Brian Sefcik John Nash
Staff Geologist Senior Manager, Client Services
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Section 8
Environmental Professionals’
Qualifications
BC personnel involved with this project are listed below along with pertinent information regarding their qualifications and specialized knowledge. Additional details regarding each listed professional have been included in Appendix G.

BC EPs conducting the assessment include: Kaitlin Tanel, Brian Sefcik, and John Nash. 9-1
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Section 9
References
40 CFR 312, Standards and Practices for All Appropriate Inquiries; Final Rule, November 2005 (AAI Rule).

American Society for Testing and Materials (ASTM), November 2013. Standard Practice E1527 13 for Environmental Site Assessments: Phase I Environmental Site Assessment Process.

Brown and Caldwell., Phase I Environmental Assessment 215 Skelly, BC Project No. 154125.041.BAD022., April 6, 2020.

Brown and Caldwell., Site Reconnaissance Report Skelly, BC Project No. 156086.034.BAD012., March 3, 2021.

Contra Costa County Property Appraiser, https://www.contracosta.ca.gov/191/Assessor Environmental Data Resources, Inc., The EDR Radius Map Report with Geocheck. Inquiry number 6803037.2s.

December 29, 2021.

Environmental Data Resources, Inc., The EDR Aerial Photo Decade Package. Inquiry number 6023231.8.

March 26, 2020.

Environmental Data Resources, Inc., EDR Historical Topo Map Report. Inquiry number 6023231.4. March 26, 2020.

Environmental Data Resources, Inc., The EDR-City Directory Image Report. Inquiry number 6023231.5.

March 30, 2020.

Environmental Data Resources, Inc., Certified Sanborn Map Report. Inquiry number 6023231.3. March 26, 2020.

Environmental Data Resources, Inc., EDR Vapor Encroachment Screen. Inquiry number 6803037.2s.

January 4, 2022.

Federal Emergency Management Agency, http://msc.fema.gov/ National Wetlands Inventory Maps, http://www.fws.gov/wetlands/Data/Mapper.html U.S. Fish and Wildlife, Threatened and Endangered Species, http://ecos.fws.gov/tess_public/ A-1
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Appendix A: Figures
Image Provided By ESRI Street Map Boundaries are approximate FIGURE 1 Vicinity Map Skelly Hercules, California r!
g
¯ Legend FIGURE 2
Target Property Map
215 Skelly
215 Skelly
Hercules, California
Contra Costa County
g Transformer
r! Septic
AST
Railroad
Creek
Natural Gas Pipeline
Power Line
Stained Soil
Structure
Debris
Target Property Boundary
0 250
Feet
San Pablo Avenue
Skelly
Pavon
Pearce Road
Rosti
Pinole Creek
Residential
Properties
Residential
Properties
Residential
Properties
Residential
Properties
Residential
Properties
Residential
Properties
Residential
Properties
Commercial
Property
Residential
Properties Properties Residential
Walking Trail Burned Outbuilding Cell Tower
Skelly
FIGURE 1
Target Property Map Overhead Power Transmission Lines
FIGURE 2
Target Property Map
Image Provided By EDR Aerials Boundaries are approximate FIGURE 3 Aerial Photo Skelly 2016 Hercules, California Image Provided By EDR USGS Topographic Maps Boundaries are approximate FIGURE 4 Mare Island, Skelly 2012 California Hercules, California B-1
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Appendix B: Site and Surrounding Area Photographs
Skelly
Phase I Environmental Site Assessment
215 Skelly
Hercules, Contra Costa County, California 94547

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Hercules City CouncilSeptember 27, 2022

Hercules City Council
September 27, 2022