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' GROUND ZERO ANALYSIS,INC. <br /> 1714 Main Street - <br /> Escalon,California 95320 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> April 30, 1999 <br /> i ' Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> ' 304 E Weber Ave , 3'' Fl <br /> Stockton, CA 95202 <br /> ' Subject First Quarter 1999, 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 1999 at the subject site Groundwater related activities included monitonng <br /> groundwater elevations, purging and sampling groundwater, and analyzing samples for total <br /> ' petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) Additionally, as requested by San Joaquin County Public Health Services Environmental <br /> Health Division (PHSIEHD), samples from wells MW 1, MW3, MW4, MW 11, MW 12, and <br /> ' MW13 were analyzed for oxygenates [methyl tert-butyl ether (MTBE), ethyl tert-butyl ether <br /> (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), and tertiary butyl <br /> alcoholltert-butanol (TBA)] using EPA method 8260 <br /> ' During the first quarter 1999 (January 1 through March 31, 1999), the Soil Vapor Extraction <br /> System (VES) operated for 1,268 hours, removing an estimated 600 pounds of hydrocarbons from <br /> ' the subsurface Since full time operation began on November 19, 1997 the VES has operated for a <br /> total of 7,010 hours, removing approximately 11,450 pounds of hydrocarbons from the subsurface <br /> The system was shut down during most of February due to a system component failure <br /> 1 <br /> 1 ' <br /> roeklgmrllgm1999 <br />