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y ' <br /> ,,�•!_'t' GAVIN NEWSOM <br /> GOVERNOR <br /> csiira RiA JARED BLUMENFELD <br /> Water Boards � SECRETARY FOR <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 9 September 2021 <br /> SENT VIA EMAIL <br /> Mr. Roger Smith <br /> Glenn Springs Holdings <br /> 5 Greenway Plaza, Suite 110 <br /> Houston, TX 77046 <br /> REVIEW OF WORK PLAN FOR SOIL VAPOR INTRUSION INVESTIGATION, 1904 <br /> CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the 30 July 2021 Work Plan for Vapor Intrusion Investigation (Work Plan) <br /> prepared by Geosyntec Consultants Inc. (Geosyntec), on behalf of Glenn Springs <br /> Holdings (Glenn Springs) and J.R. Simplot (Simplot), for the former agricultural <br /> chemical distribution facility at 1904 West Charter Way in Stockton, San Joaquin County <br /> (Site). The Work Plan was submitted in response to our 11 June 2021 letter and <br /> describes activities proposed to evaluate the potential for soil vapor intrusion of volatile <br /> organic compounds (VOCs) from the Site's subsurface into residential homes located <br /> adjacent to the Site. <br /> BACKGROUND <br /> Previous activities associated with storage and distribution of agricultural chemicals at <br /> the Site resulted in a release of contaminants, including pesticides, fumigants, <br /> herbicides, nitrate, and ammonia, to soil and groundwater. The groundwater <br /> contamination extends from the Site towards the east and beneath a portion of an <br /> adjacent residential area. <br /> Remedial actions conducted at the Site include removal of chemical storage structures, <br /> excavation and removal of pesticide-contaminated soil, on-Site thermal treatment of <br /> pesticide-contaminated soil, and in-situ bioremediation of chlorinated organic <br /> compounds in groundwater by Hydrogen Release Compound (HRC°) application. The <br /> Site is currently vacant, and its entire perimeter is fenced. Concrete slabs and structural <br /> foundations for former infrastructure remain in some areas of the Site. The current <br /> remedy for residual groundwater and soil contamination at the Site is phytoremediation <br /> (by Eucalyptus trees). The remedy for off-Site groundwater contamination is monitored <br /> natural attenuation (MNA). <br /> KARL E. LONGLEY ScD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />