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PUBLIC <br /> H?ALTH SERVI(!S <br /> SAN JOAQUIN COUNTY = y <br /> w: '4 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �4t FORa`P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 " Y <br /> 209/468-3420 HLE No <br /> PAUL SUPPLE <br /> ARCO PRODUCTS COMPANY JUN 15 1999 <br /> P O BOX 6549 <br /> MORAGA CA 94570 <br /> RE: ARCO #6100 SITE CODE: 1708 <br /> 25775 Patterson Pass <br /> Tracy, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Hydrocarbon Mass Evaluation" dated October 12, <br /> 1998, prepared by Pinnacle Environmental Solutions for the above referenced <br /> site. <br /> The last investigative work at this site was completed in July 1995. In an August <br /> 8, 1995, meeting in the office of PHS/EHD, documented in a letter from <br /> PHS/EHD dated September 6, 1995; it was discussed that remediation of this <br /> site would be postponed. This site was considered to be of low priority, <br /> compared to other ARCO sites. In an October 29, 1996, meeting in the office of <br /> PHS/ documented computer uterr model should be used o evaluate if PHS/EHD dated November 1996; it was <br /> discussedssed that some type of omp <br /> further action at the site was necessary. This modeling was never performed <br /> and/or submitted to PHS/EHD. During a February 18, 1998 meeting in the office <br /> of PHS/EHD, documented in a letter from PHS/EHD dated February 28, 1998 it <br /> was discussed that the contaminant mass should be calculated and submitted as <br /> part of a closure report for this site. This resulted in the preparation of the <br /> October 12, 1998 report. <br /> In the October 12, 1998 report and a report dated November 12, 1992, there is <br /> discussion about the well log for the on site domestic well, but this log has never <br /> been provided to PHS/EHD. A copy of the well log should be submitted to <br /> PHS/EHD. The report states that the well log suggests that depth to water is <br /> about 396 feet below surface grade (bsg). The log of a well at 26116 Patterson <br /> Pass indicates a screened interval from 153 to 193 bsg and depth to water after <br /> well completion to be 63 feet bsg. Great differences in site elevations and the <br /> existence of artesian wells exist in this area. Depth to water in the on site well <br /> has not been measured and reported to PHS/EHD. A water sample has not <br /> been collected, analyzed for petroleum hydrocarbon contamination, and results <br /> reported to PHS/EHD from this well. <br /> A Division of San Joaquin County Heaith Care Services <br />