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of 0.002 ft/ft (Figure 1) <br /> iGroundwater Analytical Results <br /> The chemical analytical results of groundwater samples obtained from monitor wells at the Site on <br /> May 4, 1995 are summarized in Table B and shown on Figure 2 Chemical results indicate that no <br /> detectable concentrations of TPHg and BTEX constituents were identified in monitor wells MW-27, <br /> MW-28, MW-29, and MW-30 These chemical concentrations are consistent with the concentrations <br /> identified during the last annual event The remaining monitor wells at the Site were not sampled and <br /> have been dry since 1989 Attachment I contains photocopies of the laboratory analytical reports and <br /> chain-of-custody forms. <br /> SITE REMEDIATION <br /> Soil Remediation System <br /> The soil remediation system consists of ten soil vapor extraction wells with thermal oxidation <br /> treatment and continues to operate at the Site During Site visits, SECOR monitored system <br /> parameters and collected appropriate influent and effluent soil vapor samples A site visitation log <br /> is maintained documenting Site activities and can be made available upon request During this <br /> reporting period, the average extraction rate of the remediation system was 100 scfm which removed <br /> and treated approximately 260 pounds of gasoline Approximately 105,950 pounds of gasoline have <br /> been removed and treated at the Site since the system began operating in August 1989 The total <br /> pounds of gasoline removed is based on the cumulative pounds removed reported by the former <br /> consultant, Sunnver, and added to the pounds of gasoline removed during the system operation by <br /> SECOR The operating efficiency of the system during this period was 70% percent The soil vapor <br /> analytical results and system efficiency results are included as Attachment R <br /> This report presents our understanding of existing conditions at the subject Site. The conclusions <br /> contained herein are based on the analytical results and professional judgment which are in accordance <br /> with current standards of professional practice, no other warranty is expressed or implied SECOR <br /> assumes no liability for exploratory borings or data reported by other consultants or contractors <br /> Sincerely, <br /> SECOR International Incorporated <br /> C � L p No.6065 <br /> Suzanne M Baehr John E Bower, R G <br /> Staff Geologist Senior Geologist OF CAL�FO� <br /> SMB/JEB: sb <br /> Attachments <br /> SECOR International,Inc CONOCO, Inc <br /> Conoco1N0700-0081stockton 295 2 July 12, 1995 <br />