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Mr Harlin Knoll <br /> Page 2 of 2 <br /> Groundwater samples were submitted to Argon Laboratories LAP #2359) for analysis of TPHg <br /> and BTEX utilizing EPA methods 8015 modified and 8020, respectively <br /> Groundwater samples collected from well MW 1 and MW5 contained elevated levels of petroleum <br /> hydrocarbons Most notably, well MW5 contained TPHg and benzene at 42,000 parts per billion <br /> (ppb) and 7,000 ppb, respectively, and well MW1 contained TPHg and benzene at 260 and 4 1 <br /> ppb, respectively In addition, well MW8 reportedly contained gasoline hydrocarbon constituents <br /> during this most recent sampling Analytical results have been non-detect in all but 4 of 31 <br /> groundwater samples collected from well MW8 since it was installed in January 1990 No <br /> gasoline constituents were reported above laboratory detection limits in wells MM2, MM3, or <br /> MW4 Figure 3 shows the estimated extent of dissolved benzene in groundwater Analytical <br /> results are summarized in Table 2 Laboratory data sheets and chain of custody documentation <br /> are included in Attachment B <br /> The fourth quarter monitoring and sampling event is scheduled for November 1999 A 48-hour <br /> notice will be given prior to conducting any fieldwork <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or <br /> comments regarding the site <br /> Sincerely, �'t�R�O GFD(D <br /> Ground Zero Analysis, Inc <br /> � j0!'N P a <br /> LANE o <br /> No 6795 <br /> John P Lane <br /> C7777t 6795 �d <br /> � kr�`��� OCO'cP <br /> GREGORY P. <br /> Gregory P Stahl,RG 5023 STAHL <br /> CA Certified Hydrogeologist 264 No 5023 <br /> SG �l9TF of CAUF°��\P <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr Patrick D Riddle, Esq <br /> CRWQCB Sacramento <br /> Clem n=V«jmu3gm1W9 am <br />