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GROUND ZERO ANALYSIS,INC. <br /> 1714 Main Street ' <br /> Escalon,California 95320-1927 % tit 7 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> November 14, 2000 <br /> Mr Harlan Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Subsurface Investigation and Quarterly Groundwater Monitoring Report <br /> Knowles Property, 1140 W Hammer Lane, Stockton, California <br /> Dear Mr Knoll <br /> This report summarizes activities at the subject site (Figure 1) during the period July 1, 2000 <br /> through September 30, 2000 Activities during the quarter included dnlhng and sampling a soil <br /> boring (SBTX) north of monitoring well MW5 to investigate the northern extent of groundwater <br /> contamination, monitoring depth to water in all site wells, purging and sampling wells NMI, <br /> MW2, MW3, MW4, MW5, and MW8, analyzing samples for benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) <br /> ADDITIONAL. SUBSURFACE INVES'T'IGATION <br /> The additional investigation was conducted pursuant to the San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) directive dated July 8, 1999, and in <br /> accordance with the October 12, 1999 workplan and June 22, 2000 workplan addendum prepared <br /> by Ground Zero Analysis, Inc (Ground Zero) <br /> Field Methods <br /> Bonng SB1X was advanced in the northernmost eastbound driving lane of Hammer Lane (Figure <br /> 2) to investigate subsurface conditions north of well MW5 The conditions of an encroachment <br /> permit issued by the City of Stockton required the work to be performed between the hours of <br /> 11 00 p m and 6 00 a in Sean Garvey and John Lane of Ground Zero arrived at the site the <br /> evening of July 13, 2000 to supervise drilling activities and traffic control, and drilling commenced <br /> shortly after midnight Mr Harlan Knoll of San Joaquin County Public PHS/EHD conducted a <br /> site inspection and observed field activities <br /> Fisch Environmental (Fisch), a State licensed drilling company (C57-683865), advanced the <br /> borings under the supervision of field geologist Sean Garvey and project manager John Lane, a <br /> Knowles hwnhepoâ–ºW3gm2000 doc <br />