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GROUND ZERO ANALYSIS, INC. v t 10 <br /> i <br /> ' 1714 Main Street <br /> Escalon,California 95320 <br /> Telephone (209)538-9888 <br /> ' Facsimile (209)838-9883 <br /> ' March 15, 2000 <br /> t Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , 3rd Fl <br /> Stockton, CA 95202 <br /> Subject First Quarter 2000 Report, Knowles/Roek Property, 102 South Wilson Way, <br /> Stockton, California (Figure 1) <br /> ' Dear Mr Rowe <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize activities during <br /> the first quarter 2000 at the subject site Groundwater related activities included monitoring <br /> ' groundwater elevations and sampling groundwater from monitoring wells As requested by San <br /> Joaquin County Public Health Services Environmental Health Division (PHS/EHD), groundwater <br /> samples were also collected from all vapor wells except VW2 All samples were analyzed for <br /> ' total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX), and oxygenates [methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), <br /> di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), and tertiary butyl alcohol/tert- <br /> ' butanol (TBA)) using EPA method 8260 <br /> During the first quarter 2000 the soil vapor extraction system (VES) operated from January 1 <br /> ' through January 3 The system was shut down on January 3 pending direction from PHS/EHD <br /> with respect to the confirmation soil borings and remedial effectiveness evaluation proposed in <br /> Ground Zero's workplan dated September 17, 1999 As of the January 3, 2000 system shutdown <br /> ' the VES had operated for a total of 12,225 hour s and removed approximately 12,670 pounds of <br /> hydrocarbons from the subsurface <br /> roeklgnirll gm2000 <br /> 1 � <br />