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COPY GINC. July 6, 2000 Mr Marty Hartzell California Regional Water Quality Control Boat 344; Routier Road, Suite A Sacramento, California 95827 Subject Schedule for Saniphng the Interim Groundwater Extraction and Treatment System and Vapor Extraction S) stem at Former Chevron Station 49-5775, 301 West Kettlennan Lane, Lodi, California Mr Hartzell As diSCUSSed at the subject site on July 3, 2000, )oil requested a schedule for sampling tine interim Groundwater Extraction and Treatment System (GWETS) and the ETS aiipdrVES wereito bettein operation by by required by Cleanup and Abatement Order No 5-00-704 tine GWETS July 3, 2000 On July 3, 2000, Mr Bob Cochran (Chevron Products Company), Mr Marty Hartzell (California Regional Water Quality Control Board), Mr Harlin Knoll (San Joaquin County Public Health • Services), Mr Gieg A Gurss (Gettler-Ryan Inc ) and other Gettler-Ryan Inc employees were present at 2 00 pm to verify that the GWETS and VES were operational Groundwater is extracted from well EX -i and pumped to a feed tank Water from the feed tank is then pumped through three - 2,000 pound carbon vessels connected in series prior to discharge to the City's industrial waste line As discussed, the initial sampling of tile GWETS is scheduled for July 5, 2000 at 10 00 am The City of Lodi, Department of Public Works will have a representative onsite to witness tills sampinlg event Samples will be collected from the influent (prior to tine 1" carbon vessel), after the land 2"d carbon vessels, and the effluent (after the 3" carbon vessel) The water samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methanol by metliod 8015in/8020, TBA, DIPE, TAME, ETRE, MtBE, EDB, 1,2 -DCA, and ethanol by method 8260 The GWETS will be sampled weekly on each Wednesday at 10 00 air for the next 2 months Samphng frequency after the initial 2 months may be altered depending on analytical results and authorization from the City of Lodi The VES consists of a catox with a blower which is currently extracting soil vapor from the four onsite vapor extraction wells VWI through VW4 We are scheduled to have the San Joaquin Unified Air Pollution Control District inspection on Monday, July 10, 2000 at 10 00 am Per the Authority to Construct, influent and effluent vapor samples will be collected and analyzed for TPHg/BTEX/MtBE by method 8015m/8020 The VES will be monitored twice a month with influent and effluent samples collected monthly The samples will be collected during the third week of each month 0 346408 09 Cl i -9577i Rtn]Ldl-11 SamPLn". SCh 6747 Sierra Court, Suite J 9 Dublin, California 94568 (925) 551-7555