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. GROUNDWATER MONITORING Groundwater Levels On January 17, 1995, Apex personnel collected groundwater-level measurements from all six 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 i laquid-level measurements collected since January 1993 are summarized in Table 1 Figure 3 is a potentiometnc surface map of the shallow water- bearing zone on January 17, 1995 Groundwater S8MD]in2 and Analysis On January 17, 1995, Apex personnel collected groundwater samples from all six monitoring wells(MW-1B, MW-2 through MW-6) 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 since January 1992 for total petroleum hydrocarbons (TPH), as gasoline, and benzene, toluene, ethylbenzene and total xylenes are summarized in Table 2 The laboratory analytical reports and sham-of-custody form are included in Attachment 2 • VAPOR EXTRACTION RESULTS On December 6, 1994, a soil vapor extraction system consisting of an R S I SAVE System was mstalled at the 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 The system was started on December 6, 1994, and after adjustments, has been operated continuously since December 13, 1994 Soil vapor flow to the system has vaned from 25 cubic feet per mmute(cfm) on December 6, 1994, to 33 cf n on January 10, 1995 Vapor samples were collected from the system influent and effluent on December 7, 1994, to demonstrate compliance with San Joaquin Valley Unified Air Pollution. Control District Permit The initial vapor extraction rate was 25 standard cubic feet per minute (SCFM) Based on the vapor sample analytical results the system extraction rate was 0 3 pounds per day(lb /day) as gasoline Petroleum concentrations in the stack gas were below laboratory detection limits, petroleum constituent discharge rates were essentially zero Air analytical results are contained m Attachment 2 System operating data and backup calculations are contained in Attachment 3 ie 2