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GROUND ZERO ANALYSES, INC. <br /> 1714 Main Street <br /> Fscalon, California 95320 <br /> Telephone- (209) 838-908 <br /> Facsimile: (209) 838-9883 <br /> July 9, 1998 <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Second Quarter 1998 Report, Knowles/Roek Property, 102 South Wilson Way, <br /> Stockton, California <br /> Dear Mr Rowe <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize activities <br /> during the second quarter 1998 at the subject site (Figure 1) Groundwater related activities <br /> included monitoring groundwater elevations, purging and sampling groundwater, and analyzing <br /> samples for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX) Additionally, after approval by San Joaquin County Public Health <br /> Services Environmental Health Division (PHS/EHD), samples from wells MW1, MW3, MW4, <br /> MW 11, MW 12, and MW 13 were analyzed for oxygenates [methyl tert-butyl ether (MTBE), <br /> ethyl tert-butyl ether (ETBE), di-isopropyl enter (DIPS), tertiary amyl methyl ether (TAME), <br /> and tertiary butyl alcohol/tert-butanol (TBA)l using EPA method 8260 <br /> Also during the second quarter 1998, the vapor extraction system (VES), which began full time <br /> operation on November 19, 1997, operated for 1,512 hours, removing an estimated 2,800 <br /> pounds of hydrocarbons from the subsurface As of June 28, 1998, the system had operated for <br /> a total of 3,353 hours <br /> rrnk%gmrl2gm1998 <br /> F <br /> f <br /> I <br />