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R �T=: EOM°NOG.BA°wN JR. <br /> F'''- ovERxox <br /> MATrxaw R°Ga,°a¢Z <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> 6 September 2016 RECEIVED <br /> Min Le SEP 6 7 276 <br /> McBillin Real Estate Investment ENVIRONLIENTAL HEALTH <br /> 3293 Napa Drive PERMIRSEROCES <br /> San Jose, CA 95148 <br /> McBILLIN REAL ESTATE INVESTMENT, 2154 SOUTH EL DORADO STREET, <br /> — --ST0GKT9Nj-SAN JOAQUIN COUNTY, CASE# 391184 <br /> On behalf of the Central Valley Regional Water Quality Control Board (Central Valley Water <br /> Board), I am pleased to notify you that as of 1 June 2016, 1 am the assigned caseworker for <br /> the underground storage tank release at the McBillin Real Estate Investment property in <br /> Stockton. My contact information is included at the end of this letter. <br /> I have reviewed the following documents, submitted on your behalf by Advanced <br /> GeoEnvironmental Inc. (AGE) for your property at 2154 South EI Dorado Street in Stockton <br /> (Site): <br /> • Work Plan Addendum (Soil Gas Work Plan), dated 29 July 2016 <br /> • Monitoring Well Installation Work Plan Addendum—August 2016 (Monitoring Well <br /> Work Plan), dated 8 August 2016 <br /> In the Soil Gas Work Plan, AGE proposes the installation and sampling of three soil gas <br /> wells: one in the Site source area (former tanks), and two along the eastern property <br /> boundary, near neighboring residences. In the Monitoring Well Work Plan, AGE proposes <br /> the installation of two deep monitoring wells down-gradient: one in the gravel road at the east <br /> edge of the Site property, and one approximately 600 feet east of the Site source area; both <br /> to be screened 90-100 feet below ground surface (bgs). <br /> Additional assessment is needed at this Site, beyond what is proposed in these two Work <br /> Plans, and a Work Plan Second Addendum is requested. Below are my comments on the <br /> submitted Work Plans, and on the status of the assessment of the petroleum release from <br /> the Site: <br /> 1. The soil gas wells proposed in the Soil Gas Work Plan are intended to be "semi- <br /> permanent", and the annular seals are proposed to consist of hydrated bentonite. <br /> However, in accordance with the July 2015 Department of Toxic Substances Control <br /> (DTSC) guidance document Advisory—Active Soil Gas Investigations, soil gas wells <br /> constructed with a bentonite annular seal can be used for no more than 1 year. <br /> Permanent soil gas wells should be installed to allow for repeatable soil gas sampling <br /> in the future. Per DTSC guidance, permanent soil gas wells should have an annular <br /> seal consisting of neat cement with a bentonite content of 1-5%, and a six-inch <br /> KARL E. LONGLEV SOD, P.E.. CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Son Center Drive 4200,Rancho Cor0ova,CA 05670 1 www.waterboords.ca.gov/contmivalley <br /> 4!Recvcs°xn"eR <br />