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rr 1 <br /> �t f, Mr Harhn Knoll <br /> Page 2 <br /> The groundwater sample collected from well NMS contained elevated levels of petroleum <br /> hydrocarbons, BTEX and TPHG were detected at concentrations of 11,000 parts per billion (ppb), <br /> 7,800 ppb, 1,500 ppb, 12,000 ppb, and 94,000 ppb, respectively MW 1 contained BTEX and TPHG <br /> at concentrations of 96 ppb, 4 6 ppb, 150 ppb, 120 ppb, and 5,000 ppb, respectively No BTEX or <br /> TPHG were detected in wells MW2, 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 November 1997 and will include <br /> monitoring depth to water in all site wells, purging and sampling wells NMI, MW4, MWS, and MWB, <br /> 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 /> L <br /> J John P Lane RED GFp�O <br /> Senior Geologist �C� <br /> N <br /> � GREGORY P. `+ <br /> STAHL <br /> No. 5023 1�1 <br /> Gregory P Stahl, RG 5023 J, <br /> CA Certified HydrogeoIogist 264 r�lF OF CAL1����`P <br /> JPL <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr James Lewis, Riddle&Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> groundzellmowiee ham13gm1997 doc <br />