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r1 it <br /> . Mr Harlin 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 12,000 parts per billion (ppb), <br /> 6,600 ppb, 1,300 ppb, 11,000 ppb, and 95,000 ppb, respectively MW1 contained BTEX and <br /> TPHg at concentrations of 88 ppb, 15 ppb, 97 ppb, 88 ppb, and 3,600 ppb, respectively No <br /> BTEX or TPHg were detected in wells MW4 or MW8 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 /> The next quarterly monitoring and sampling is scheduled for August 1997 and will include <br /> morattoring depth to water in all site wells, purging and sampling wells MWI, MW3, MW4, <br /> MWS, and MW8, 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 /> ,SERE© GEO <br /> John P Lane ��S Zo <br /> Senior Geologist <br /> GREGORY P. <br /> STAHL <br /> No 5023 4 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 TF 0 CALIFOR� <br /> JPL <br /> Attachments <br /> cc Mr. Carl Knowles <br /> Mr James Lewis, Riddle & Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> groundzalknowka ham12gm1997 <br />