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I u <br /> . Mr Harlan Knoll <br /> Page 2 <br /> Samples collected from wells MW3, MW4 and MW8 contained very low levels of petroleum <br /> hydrocarbon constituents, wells MW 1 and MW5 contained moderate and highly elevated levels, <br /> respectively MW 1 contained benzene, toluene, ethylbenzene, xylenes, and TPHg at <br /> concentrations of 40 parts per billion (ppb), 1 4 ppb, 48 ppb, 36 ppb, and 1,500 ppb, <br /> respectively MW3 contained benzene and TPHg at 7 9 and 200 ppb, respectively MW4 <br /> contained benzene and TPHg at 4 8 and 150 ppb, respectively No toluene, ethylbenzene, or <br /> xylenes were detected in wells MW3 or MW4 MW5 contained benzene, toluene, ethylbenzene, <br /> xylenes, and TPHg at concentrations of 20,000 ppb, 6,700 ppb, 760 ppb, 14,000 ppb, and <br /> 84,000 ppb, respectively MW8 contained benzene, toluene, and xylenes at 1 5 ppb, 2.3 ppb, <br /> and 1 6 ppb, respectively, but was non-detect for ethylbenzene and TPHg. Analytical results <br /> are summarized in Table 2 Laboratory data sheets and chain of custody documentation are <br /> included in Attachment B Figure 3 shows the estimated extent of dissolved benzene in <br /> groundwater <br /> The next quarterly monitoring and sampling is scheduled for December 1996 and will include <br /> monitoring depth to water in all site wells, purging and sampling wells MW 1, MW2, 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 <br /> comments regarding the site <br /> Sincerely, <br /> Ground Zero Analysis, Inc <br /> John P. Lane i GEo�o <br /> Seni r Geologist <br /> f g GREGORY P. <br /> STAHL <br /> No 5023 <br /> Gregory P Stahl RG 5023 s <br /> g <br /> CA Certified Hydrogeologist No 264 ('OF CAt►F����� <br /> Attachments <br /> PC Mr Carl Knowles <br /> Mr James Lewis, Riddle & Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> grouadzolknowlrz haml3gmt996 <br />