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Second Quarter 2000 Site Update - Foinier Chevron #9-5775 (CAO #5-00-704) July 14, 2000 Feasibility Testirift To evaluate the feasibility of using extraction of soil vapors to reduce the residual hydrocarbon mass in the unsaturated soil, GR conducted a vapor extraction feasibility test GR extracted soil vapor from wells VW -1 and VW -2 using a VR Systems III internal combustion vapor extraction system (VES) on April 6, 13, 19, 27 and May 4, 2000, as allowed by the San Joaquin Valley Unified Air Pollution Control District Authority (SJVUAPCD) GR monitored influent conditions and radius of influence on April 6 (Tables I and 2) These data indicate an effective radius of influence of approximately 60 feet Vapor samples were collected from the influent and effluent vapor streams on each of the five test days These samples were analyzed by Sequoia Analytical (FLAP #1271) Influent rpHg concentrations ranged from 3,600 to 26,000 milligrams per cubic meter VES analytical and operational data aie summarized in Tables 3 and 4 Weekly Well P1.1111ping GR extracted groundwater From well EX- I for approximately 8 houi s on a weekly basis between April 6 and June 29, 2000 (a total of 13 events) Approximately 2,635 gallons were removed during this period Samples were collected from the well at the conclusion of each pumping event, then submitted for analysis at Sequoia Analytical Detectable concentrations of TPHg ranged from 18,000 to 68,000 parts per billion (ppb), benzene concentrations ranged from 11,000 to 27,000 ppb, and methyl tert-butyl ether (MTBE) concentrations ranged from 200,000 to 500,000 ppb Groundwater samples also contained detectable concentrations of toluene, ethylbenzene, xylenes, tert-butyl alcohol (TBA), ethyl tert-butyl ether (ETBE), and tert-amyl methyl ether (TAME) These data are summarized in the attached Table 5 During this period, concentrations of TPHg, benzene and MtBE show a decreasing trend Installation of Treatment System Installation of a groundwater and soil vapor extraction and treatment system began on June 5, 2000 The treatment system was constructed under City of Lodi Building Permit #B2038, City of Lodi Encroachment Permit #20103, City of Lodi discharge permit #295, CalTrans Encroachment Permit #1000-6UL-0376, and SJVUAPCD Authority to Construct #N-4343-1-0 Copies of these perm its are attached The system became operational on July 3, 2000 Location of the treatment system compound is shown on Figure 2 Groundwater is extracted from well EX -1 by an electric submersible pump Extracted groundwater flows through three 2,000 -pound liquid phase activated carbon vessels prior to discharge to the City of Lodi's industrial waste sewer A schematic diagram of the groundwater treatment system is shown on Figure 3 Extracted soil vapor is routed through a catalytic oxidizer prior to discharge to the atmosphere A schematic diagram of the soil vapor treatment system is shown on Figure 4 Evaluation of Treatment System Performance and Effectiveness The treatment system did not operate during the second quarter 2000 Evaluation of system operation and effectiveness will require continuous operation of both the groundwater and vapor extraction systems • 34640807 2