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. a � Quarterly Groundwater Monitoring,Remediation Status Report& Sod-Boring Verification Workplan ' M00%'Petroleum,Inc, 1399E Yosemite Ave,Manteca,CA 'March 26, 1996 Page 2 GROUNDWATER MONITORING ' groundwater Levels On February 2, 1996, Apex personnel collected groundwater-level measurements from all six ' momtornig wells 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 January 1993 are summarized in Table 1 Figure 3 is a potentnometrnc surface map of the shallow water-bearing zone on February 2, 1996 ' Groundwater Sampling and Analysis On February 2, 1996, Apex personnel collected groundwater samples from all six monitoring ' wells(MW-1B,MW-2 through MW-6) The samples were submitted, under cham-of-custody,to Sparger Technology, Inc , of Sacramento, California, a state-certified analytical laboratory The AJ(D wells were sampled for total petroleum hydrocarbons(TPH), as gasoline, TPH, as diesel, — ,� r n benzene,toluene, ethylbenzene and total xylenes(BTEX) Groundwater monitoring wellMW-1B �.�-tQ4 was sampled for methyl-tert-butyl-ether(MTBE) as per San Joaquin County Environmental Health Drvision request All samples were collected according to the Apex SOP included in Al ' Attachment 1 All Analytical results since January 1992 for TPH, as gasoline, BTEX and MTBE are summarized in.Table 2 The February 2, 1996, laboratory analytical reports and sham-of- custody form are included in Attachment 2 All six groundwater samples collected on February 2, ' 1996, were below laboratory detection limits for TPH, as gasoline, BTEX and MTBE REMEDIATION STATUS On December 6, 1994, a soil vapor extraction system consisting of an R S I SAVE system was installed 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 consisted of an internal combustion engine with catalytic converters mounted on the exhaust The system was started on December 6, 1994, and after adjustments, has operated continuously from December 13, 1994 through March 21, 1995 / The system was shut down on March 21, 1995 due to low influent hydrocarbon levels The R S I unit was replaced with a 160 standard cubic feet per minute (SCFM) regenerative type blower which extracts soil vapors from either monitoring well MW-1B or a section of underground la 0