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Mr Harlan Knoll <br /> Page 2 <br /> The groundwater sample collected from well MW5 contained elevated levels of petroleum <br /> hydrocarbons, BTEX and TPHg were detected at concentrations of 32,000 parts per billion (ppb), <br /> 29,000 ppb, 4,600 ppb, 38,000 ppb, and 190,000 ppb, respectively MW1 contained BTEX and <br /> TPHg at concentrations of 57 ppb, 27 ppb, 69 ppb, 99 ppb, and 2,500 ppb, respectively No <br /> BTEX or TPHg were detected in wells MW2, MW4, or MW8 Analytical results are summarized <br /> in Table 2 Laboratory data sheets and chain of custody documentation are included in Attachment <br /> B Figure 3 shows the estimated extent of dissolved benzene in groundwater <br /> The next quarterly monitoring and sampling is scheduled for February 1997 and will include <br /> monitoring depth to water in all site wells, purging and sampling wells MW1, MW3, MW4, <br /> MW5, and MW 8, and analyzing samples for TPHg and BTEX <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> regarding the site <br /> Sincerely, <br /> Ground Zero Analysis, Inc <br /> D GFO�o <br /> John P Lane <br /> Senior Geologist GREGORY P. <br /> STAHL <br /> No 5023 <br /> Gregory P Stahl, RG 5023 OF CA1.IF����Q <br /> CA Certified Hydrogeologist 264 <br /> ]jb <br /> Attachments <br /> PC Mr Carl Knowles <br /> Mr James Lewis, Riddle & Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> groundzelknowles harn%4gm1996 <br />