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Groundwater Analytical Results <br /> The chemical analytical results of groundwater samples obtained from monitor wells at the site on <br /> August 29, 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 /> well MW-29 for this reporting period MTBE was reported with a concentration of 3 0 micrograms <br /> per liter (ug/1) in a sample collected from monitor well MW-29 The remaining monitor wells at the <br /> site were not sampled and have historically been dry since 1989 Attachment I contains photocopies <br /> of the laboratory analytical 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, Sunnver, and added to the pounds of gasoline removed during the system operation by <br /> SECOR <br /> FORTHCOMING ACTIVITIES <br /> During the fourth quarter of 1996, SECOR will conduct additional well monitoring, purging, and <br /> sampling activities The results of these activities will be summarized in a quarterly monitoring report <br /> to be submitted to you in January 1997 In the interim, a work plan for confirmation soil sampling <br /> will be prepared The objective of the proposed investigation is to evaluate if hydrocarbon impacted <br /> soil identified during previous investigations at the site has been adequately remediated Fieldwork <br /> to advance and sample the proposed boring will commence upon approval of the work plan and <br /> drilling permit <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, �RE�GE0, <br /> SECOR International Incorporated so ,c�` <br /> /a�[or� o No.6065 � <br /> Todd J Brown John E Bower, R G kp <br /> Staff Geologist Senior Geologist OFC <br /> TJB/JEB tb <br /> Attachments <br /> SECOR International, Inc CONOCO,Inc <br /> Conoco\J0700-019\Stockton 396 2 October 11, 1996 <br />