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Former Apache Plastics -2- 24 August 2017 <br /> "a.a East Fremont Street <br /> Stockton, <br /> Stockton,San Joaquin County <br /> Water Boards <br /> If you have any questions,please contact me by phone at(916)464-4792 or by email at <br /> Central Valley Regional Water Quality Control Board vera.fischer@waterboards.ca.gov <br /> ��gy�ONiNN.p� <br /> 24 August 2017 VG J.Fletdnr�bl� <br /> Vera Fischer,P.G. 8707 <br /> Engineering Geologist 61 ! <br /> Mr.Bill StoermerOFOAL <br /> Fremont Plaza Investments,LP cc: Nuel Henderson,San Joaquin County Environmental Management,Stockton <br /> 7015 Morton Court Daniel Villanueva,Advanced GeoEnvironmental,Inc.,Stockton <br /> Stockton,CA 95209 <br /> Project Status,tornterApache Plastics,2050 East Fremont Street,Stockton, <br /> San Joaquin County <br /> Central Valley Regional Water Quality Control Board(Central Valley Water Board)staff <br /> reviewed the Risk Assessment Work Plan(Work Plan)dated 30 June 2017,submitted on your <br /> behalf by Advanced GeoEnvironmental,Inc.(AGE). The former Apache Plastic is located at <br /> 2050 East Fremont Street in Stockton(Site). <br /> In the Work Plan,AGE proposes to install two(2)soil borings as semi-permanent soil-vapor <br /> wells and to collect shallow soil and soil gas samples to evaluate the risk residual petroleum <br /> hydrocarbons pose to human health due to dermal contact and vapor intrusion to indoor air. <br /> AGE will advance each boring to approximately 6 feet below ground surface(ft bgs)and backfill <br /> with approximately six(6)inches of sand. The soil vapor well will be constructed of/,-inch <br /> Teflon tubing,attached to a 1/,inch diameter 2-inch long soil vapor sample implant placed from <br /> approximate 5.3 to 5.5 ft bgs. <br /> AGE will collect a soil sample at 5 ft bgs from each boring by hand packing soil out of the hand <br /> auger bucket into steel sample sleeves. AGE will analyze soil samples for total petroleum <br /> hydrocarbons as gasoline(TPH-G);volatile organic compounds(VOCs)including:benzene, <br /> toluene,ethylbenzene,and total xylenes(collectively BTEX)and naphthalene;and for fuel <br /> additives including:methyl tert butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tert butyl <br /> ether(ETBE),tert amyl methyl ether(TAME),tert butyl alcohol(TBA),ethylene dibromide(EDB) <br /> and 1,2-dichloroethane(1,2-DCA). AGE will analyze soil gas samples for TPH-G,BTEX, <br /> naphthalene,MTBE,DIPE,ETBE,TAME,TBA,1,2-DCA,and EDB. <br /> Central Valley Water Board staff concurs with the scope of work presented in the Work Plan. <br /> Central Valley Water Board staff also requests that you analyze the soil gas samples for oxygen <br /> and for the selected leak detection compound.Please complete at least two rounds of soil gas <br /> sampling for verification of sample results. Therefore,by 15 December 2017 please submit the <br /> results of the initial soil gas sampling event. Please submit the results of the second soil gas <br /> sampling event by 15 June 2018. <br /> KARL E.L-Y BcD,P.E..cww I P. C.Cw P.E.,BCEE,11-­11 <br /> �.oso eun c.m.onr..so0.Wwoe c..eo...Gw aivo I......i«ac.aa...aw.cw,vw•uy <br />