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oll <br />�1 Mr Harlan age 2 <br /> parts per billion (ppb), 1.0 ppb, 5.0 ppb, 4.3 ppb, and 140 ppb, respectively MW5 contained <br /> benzene, toluene, ethylbenzene, xylenes, and TPHg at concentrations of 5,200 ppb, 2,700 ppb, <br /> 610 ppb, 4,400 ppb, and 48,000 ppb, respectively. Analytical results are summarized in Table <br /> 2. Laboratory data sheets and chain of custody documentation are included in Attachment B. <br /> Figure 3 shows the estimated extent of dissolved benzene in groundwater. <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> approved modifications to the groundwater monitoring and sampling program at the site as <br /> follows wells MW1, MW4, MW5, and MW8 sampled quarterly, MW3 sampled semi-annually, <br /> MW2 sampled annually; and MW6 and MW7 removed from the sampling program. <br /> The next quarterly monitoring and sampling is scheduled for August 1996. <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or <br /> comments regarding the site. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. <br /> lzz �"f ut-� <br /> ,1 ED GES <br /> John P Lane �0. <br /> Se r Geologist �� GREGORY P. . <br /> STML <br /> No. 5023 4 <br /> Gregory P. Stahl, RG 5023 <br /> CA Certified Hydrogeologist No. 264 'ilF OF CAL%�fl��\� <br /> Attachments <br /> PC: Mr. Carl Knowles <br /> Mr. David Isola, Riddle & Isola <br /> Ms. Elizabeth Thayer, CRWQCB Sacramento <br /> grouadze\ nowies h=VA n1996 <br />