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PUBLIC ITEALTH SERVES <br /> SAN JOAQUIN COUNTY <br /> a: a <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer o . <br /> 9CFO Re\ <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-34201- i l <br /> ED RALSTON <br /> TOSCO MARKETING COMPANY SEP 15 1991 <br /> ENVIRONMENTAL COMPLIANCE DEPARTMENT <br /> 2000 CROW CANYON PLACE STE 400 <br /> SAN RAMON CA 94583 <br /> Re: Unocal Station 96981 'Site Code: 1217123 <br /> 4707 Pacific Avenue <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has completed <br /> review of the MPDS"Quarterly Data Report"dated August 18, 1997 that included the results of the July <br /> 16, 1997 sampling event. The report was received by PHS/EHD on September 10, 1997. PHS/EHD has <br /> the following comments for your consideration and response. <br /> PHS/EHD did not receive a copy of the report for the second quarter's groundwater monitoring event. <br /> The third quarterly report did not include results for the second quarter's groundwater monitoring event <br /> which would suggest that samples or measurements were not collected during the second quarter. Please <br /> provide an explanation why samples and/or measurements were not collected without notice to <br /> PHS/EHD. <br /> PHS/EHD prepared the following summary to aid in the evaluation of the site's monitoring capacity and <br /> the site's well condition after noticing that vapor extraction well VW2 was dry. <br /> Well Screened Interval-feet Date Installed Depth to WatberrsJ)ly 1997 Total Depth(feetbJguuly 1997 <br /> eetbelow ground surface(bgs) 32 72 51.85 <br /> MW-1 55-51 1/31/90 <br /> 2/1/90 <br /> MW-2 55-51 34.24 53.60 <br /> Mµ+-4 55-51 2/5/90 34.18 54.81 <br /> MW-5 55-50 2/6/90 34.32 54.23 <br /> MW-6 69-49 3/3/92 34.03 69.23 <br /> MW-7 69-49 3/3/92 34.71 68.73 <br /> MW-8 69-49 4/4/92 32.47 68.95 <br /> MW-9 70-50 8/10/92 33.84 69.80 <br /> MW-11 72-52 8/12/92 unknown 72.48 <br /> PTW-1 72.5-52.5 8/12/92 unknown unknown <br /> VW-1 49-24.5 3/2/92 33.89 45.15 <br /> VW-2 50.5-25.5 3/9/92 reported dry 32.26 <br /> VW-3 50.5-25.5 3/9/92 33.98 39.26 <br /> VW-4 50.5-25.5 3/10/92 34.13 35.68 <br /> VW-5 31 -6 12/3/93 unknown unknown <br /> VW-6 32-22 12/3/93 unknown unknown <br /> It appears that vapor extraction well VW2 is damaged in some way. VW2,VW4, and VW5 are the wells <br /> used for vapor extraction. VW2 should have a total depth around 50 feet bgs instead it is reported at <br /> A Division of San Joaquin County Health Care Services <br />