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• Soil Vapor Extraction <br /> During site visits,SECOR monitored system parameters and collected appropriate influent soil vapor <br /> samples Air samples were collected on April 9, 2002 and May 1, 2002 No air sample was <br /> collected in June due to system maintenance and repairs Based on the influent soil vapor samples <br /> analytical results, approximately 377 pounds of gasoline were removed and treated at an average <br /> extraction rate of 53 scfm for this reporting period A total of approximately 38,178 pounds of <br /> gasoline has been removed and treated at the site since the SVE system began operation The soil <br /> vapor analytical results and system efficiency results are included as Attachment III <br /> FORTHCOMING ACTIVITIES <br /> During the third quarter of 2002, 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 2002 <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 %:D C 7LI, <br /> Sincerely, 0s.t3o,'��� <br /> SECOR International E ncorporated <br /> • R,1p.6465 � <br /> 9� A4�F�4 <br /> Todd J Brown Jo n E Bower, R G FC <br /> Associate Geologist Principal Geologist <br /> TJB/JEB do <br /> Attachments <br /> cc Harlin Knoll, San Joaquin County Public Health Services <br /> Elizabeth Thayer, California Regional Water Quality Control Board <br /> C Mme 03RI.ockdordQ202 3 sHCOR <br /> 770T 4737 00 003 <br />