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Mr Michaellnfurna <br /> . November 3, 1998 <br /> Page 2 <br /> No petroleum hydrocarbon constituents were detected in well MW3 Benzene was detected in <br /> wells MW 1 and MW2 at concentrations of 22 parts per billion (ppb) and 9 6 ppb, respectively <br /> TPHg was detected at 120 ppb and 100 ppb, respectively, in wells MW 1 and MW2 Analytical <br /> data are summarized in Table 2. Laboratory reports and chain-of-custody documentation are <br /> included in Attachment B <br /> CONCLUSIONS <br /> Dissolved benzene concentrations decreased by more than 70% in wells MW1 and MW2 since <br /> last analyzed in July 1997, and TPHg concentrations fell by more than 80% Time vs <br /> Concentration plots of benzene and TPHg for these wells are presented in Figures 3 and 4 Well <br /> MW3 remained free of contaminants <br /> Please contact the undersigned at (209) 838-9888 if you have any questions regarding this report <br /> Respectfully, <br /> Ground Zer sis, Inc <br /> d4atve RED G <br /> Staff Geologist <br /> � O`0 <br /> JOHN P �t <br /> t-AI'dc <br /> � Lae--<' N No 6795 <br /> A Q _ <br /> John P Lane �>� �_ nV) GFp� <br /> CA Registered Geologist 6795 OF G A�1�0 ��� 0�,�� <br /> GREGGRY P. J` <br /> • STAHL <br /> No. 5023 ' <br /> Gregory P Stahl, RG 5023 i <br /> CA Certified Hydrogeologist 264 `P� . <br /> Attachments <br /> cc Mr John Tague, John Pestana QTIP Trust <br /> Mr Mark List, RWQCB Sacramento <br /> pestana 0351annual98 doe <br />