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COO ps7 6ETTLER-RYAN INC. July 6, 2000 Mr Marty Hartzell California Regional Water Quality Control Board 3443 Routier Rosd, Suite A Sacramento, California 95827 Subject Schedule for Sampling the Interim Groundwater Extraction and Treatment System and Vapor Extraction s,stem at former Chevron Station 99-5775, 301 West Kettleman Lane, Lodi, California Mr Hartzell As discussed at the subject site on July 3, 2000, fou requested a schedule for sampling the interim Groundwater Extraction and Treatment System (GWETS) and the Vapor Extraction System (VES) As required by Cleanup and Abatement Order No 5-00-704 the GWETS and VES were to be in operation by 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 40 pin to verify that the GWETS and VES were operational Groundwater is extracted from well EX -1 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 oftlie 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 this sampling event Samples will be collected from the influent (prior to the I" carbon vessel), after the 1I and 2"1 carbon vessels, and the effluent (after the.) 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 method 8015111/8020, TBA, DIPS, TAME, ETBE, MtBE, EDB, 1,2 -DCA, and ethanol by method 8260 The GWETS will be sampled weekly on each Wednesday at 10 00 am for the next 2 months Sampling 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 VW1 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 VCS will be monitored twice a month with influent and effluent samples collected monthly The samples wili be collected during the third week of each month Cii 95771 Runc-di ii S impima Sch 346403 09 6747 Sierra Court, Suite J • Dublin, California 94568 (925) 551-7555