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• Groundwater Analytical Results The chemical analytical results of groundwater samples obtained from monitor well MW-30 at the Site on February 23, 1996 are summarized in Table B and shown on Figure 2 Chemical results indicate that no detectable concentrations of TPHg and BTEX constituents were identified in monitor well MW-30 for this reporting period The chemical concentrations are consistent with the concentrations identified during the last monitoring event Monitor wells MW-27, MW-28, and MW-29, are sampled annually and were not sampled this quarter (see Table B for May 5, 1995 Analytical Results). Monitor wells MW-29 and MW-30 are sampled quarterly, alternating from one well to the other. The remaining monitor wells at the Site were not sampled and have historically been dry-since 1989. Attachment I contains photocopies of the laboratory analytical reports and chain-of-custody forms. SITE REMEDIATION Soil Remediation System The soil remediation system consists of ten soil vapor extraction wells with thermal oxidation treatment. During Site visits, SECOR monitored system parameters and collected appropriate influent and effluent soil vapor samples A site visitation log is maintained documenting Site activities and can be made available upon request. During this reporting period, the average extraction rate of the remediation system was 124 scfm which removed and treated approximately 54 pounds of gasoline Approximately 106,119 pounds of gasoline have been removed and treated at the Site since the system began operating in August 1989. The total pounds of gasoline removed is based on the cumulative pounds removed reported by the former consultant, Sunnver, and added to the pounds of gasoline removed during the system operation by SECOR The operating efficiency of the system during this reporting period was 25% percent The soil vapor analytical results and system efficiency results are included as Attachment II On February 9, 1996, the operation of the soil remediation system was discontinued pending the evaluation of current regulatory changes This report presents our understanding of existing conditions at the subject Site The conclusions contained herein are based on the analytical results and professional judgment which are in accordance with current standards of professional practice; no other warranty is expressed or implied. SECOR assumes no liability for exploratory borings or data reported by other consultants or contractors. Sincerely, ED C,E—< SECOR International Incorporated ��c 'E.app VO l a No.6065 0 Todd J. Brown John E Bower, R G. Staff Geologist Senior Geologist '9� Q`2 OF CA►-,�A TJB/JEB: tb Attachments SECOR International,Inc ..._I—_'I'L"'.•'II CONOCO, Inc Conoco1N0700-00KStockton 196 2 April 22, 1996