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� 7Y ,Y Y7 1 Y I Quarterly Groundwater Monitoring&Remediation Status Report Moore Petroleum, 14800 W.Frontage Rd.,Manteca,CA September 25, 1995 Page 2 GROUNDWATER MONffORING G—rggndwater LeYels On August 16, 1995, Apex personnel collected groundwater-level measurements from monitoring wells MW-1 through MW-9. All groundwater elevations were measured to the nearest 0.01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex standard operating procedures(SOP)included as Attachment 1. Liquid-level measurements collected since May 1995 are summarized in Table 1. Historical water levels are included in Attachment 2. Figure 3 is a potentiometric surface map of the shallow water-bearing zone on August 16, 1995. Groundwater Sampling and Analylig On August 16, 1995, Apex personnel collected groundwater samples from all nine monitoring wells (MW-1 through MW-9). The samples were submitted, under chain-of-custody, to Sparger Technology, Inc., of Sacramento, California, a state-certified analytical laboratory. All samples were collected according to the Apex SOP included in Attachment 1. Analytical results collected `Y on August 16, 1995, for total petroleum hydrocarbons(TPH), as gasoline, and benzene, toluene, ethylbenzene and total xylenes(BTEX) are summarized in Table 2. All water samples collected from the nine monitoring wells detected no concentrations of TPH, as gasoline, or BTEX. Historical analytical results are included in Attachment 2. The most recent laboratory analytical reports and chain-of-custody form are included in Attachment 3. Vapor Extraction Remediation System Status In the early months of 1995, Emcon installed a soil vapor extraction system consisting of an R S.I. SAVE System at the subject site. The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District Permit conditions. The vapor extraction system consists of an internal combustion engine with catalytic converters mounted on the exhaust pipe. During this reporting period soil vapor flow to the system has varied from 16 cubic feet per minute(cf n) on June 13, 1995, to 57 cf n on June 24, 1995. Vapor samples were collected from the system influent and effluent on July 31 and August 16, 1995, to demonstrate compliance with San Joaquin Valley Unified Air Pollution Control District Permit. �r