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SITE REMEDIATION <br /> Soil Remediation System Construction <br /> Construction of a soil and groundwater remediation system was completed at the site in December <br /> 1999 The remediation system consists of seven soil vapor extraction (SVE) wells (W-1, W-3 <br /> through W-S),two groundwater monitor wells(MW-1 and MW-3) and four air sparge wells(AS-i <br /> through AS-4) with catalytic oxidation treatment A Site Plan depicting the Iocations of the <br /> remediation wells,subsurface piping,and rcmediation equipment compound is included as Figure 4 <br /> Initial start-up air discharge compliance testing was completed on December 13, 1999 The San <br /> Joaquin County Valley Air Pollution Control District(SJVAPCD)has approved an air permit for the <br /> site During site visits, SECOR monitored system parameters and collected appropriate influent soil <br /> vapor samples <br /> Based on the influent soil vapor samples analytical results, approximately 23,626 3 pounds of <br /> gasoline were removed and treated at an average extraction rate of 140 sefm for this reporting period <br /> The soil vapor analytical results and system efficiency results are included as Attachment III <br /> FORTHCOMING ACTIVITIES <br /> During the third quarter of 2000, SECOR will conduct additional monitoring, sampling and <br /> remediation system operation and maintenance activities The results of these activities will be <br /> summarized in a quarterly monitoring report to be submitted to you in October 2000 <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 <br /> accordance with current standards of professional practice, no other warranty is expressed or <br /> implied SECOR assumes no liability for exploratory borings or data reported by other consultants <br /> or contractors <br /> ��PED GEO� <br /> Sincerely, g S.80 <br /> O <br /> SECOR International Incorporated <br /> � l <br /> Todd J Brown John E Bower, R Gq <br /> Project Geologist Principal GeologistOFCAL�F°� <br /> TJB/JEB tb <br /> Attachments <br /> cc Harlin Knoll, San Joaquin County Public Health Services <br /> Elizabeth Thayer, California Regional Water Quality Control Board <br /> • C 1TIme OMLack-MrdQ200 3 SECOR <br /> 077 41737 003 duly 20 2000 <br />