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1 'Fourth Quarter 1995 Groundwater Monitoring&Remediation Status Report Moore Petroleum, 14800 W Frontage Rd,Manteca,CA January 19, 1996 Page 2 GROUNDWATER MONITORING Groundwater Leyte On November 29, 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 Operatmg 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 potentiometnc surface map of the shallow water-bearing zone on November 29, 1995 Groundwater m lin and Ani ' On November 29, 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 on November 29, 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 were below laboratory detection limits ' for TPH, as gasoline, or BTEX Histoncal analytical results are included m Attachment 2 The most recent laboratory analytical reports and chain-of-custody form are included in Attachment 3 ' Vapor Extraction Remediation System5tatus In the early months of 1995, Emcon mstalled a soil vapor extraction system consisting of a ' Remediation Service, Int'l Spray Aeration Vapor Extraction (RS I S A V E ) system at the subject site The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) 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 ranged from 29 standard cubic feet per minute(scfim) on November 7, 1995, to 48 scfin on October 3, 1995 ' influent and effluent on Vapor samples were collected from the systemSeptember 19 and November 27, 1995, to demonstrate compliance with S3VUAPCD permit. The system was not sampled during the month of October due to a vapor extraction system malfunction. t