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u .t <br /> 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 13,000 parts per billion (ppb), <br /> 6,600 ppb, 1,200 ppb, 10,000 ppb, and 97,000 ppb, respectively MW1 contained BTEX and <br /> TPHg at concentrations of 10 ppb, 2 4 ppb, 13 ppb, 12 ppb, and 270 ppb, respectively No BTEX <br /> or TPHg were detected in wells MW3, MW4, or MW8 Analytical results are summarized in <br /> Table 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 May 1997 and will include monitoring <br /> depth to water in all site wells, purging and sampling wells MW1, MW4, MW5, and MW8, and <br /> 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 Geo <br /> John P Lane ���� <br /> S77: No <br /> st J GREGORY P. <br /> STAHL <br /> 5023 <br /> Gregory P Stahl, RG 5023 �F OF XOU <br /> CA Certified Hydrogeologist 264 -- <br /> JPL <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr James Lewis, Riddle & Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> • <br /> groundw\1aww1w hnm11gm1997 <br />