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Groundwater Analytical Results <br /> The chemical analytical results of groundwater samples obtained from monitor wells at the Site on <br /> June 10, 1996 are summarized in Table B and shown on Figure 2 Chemical analytical results <br /> Indicate that no detectable concentrations of TPHg and BTEX constituents were identified in monitor <br /> wells MW-27, MW-28, MW-29, and MW-30 for this reporting period. MTBE concentrations ranged <br /> from 4 7 micrograms per liter {ug/1} in a sample collected from monitor well MW-30 to less than <br /> detectable levels in a sample collected from monitor well MW-28. The TPHg and BTEX chemical <br /> concentrations are consistent with the concentrations Identified during the last annual monitoring event <br /> for the four wells sampled. The remaining monitor wells at the Site were not sampled and have <br /> historically been dry since 1989. Attachment I contains photocopies of the laboratory analytical <br /> reports and 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 During the first quarter of 1996, the operation of the remediation system was discontinued <br /> pending the evaluation of current regulatory changes Due to the remediation system shutdown, there <br /> were no influent soil vapor samples collected this quarter Approximately 106,119 pounds of gasoline <br /> have 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, Sunriver, and added to the pounds of gasoline removed during the system operation by <br /> SECOR <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 /> GEO� <br /> SECOR International Incorporated QSC. �BD�'cOC�N <br /> o No.6065 ¢ <br /> Todd J Brown Jo n E. Bower, R G. Wig. <br /> Staff Geologist Senior Geologist y Q <br /> �OF CA1-QFC <br /> TJB/JEB tb <br /> Attachments <br /> SECOR international,Inc CONOCO,Inc <br /> conoco1J070"l91Stockton 296 2 July 23, 1996 <br />