SITE INFORMATION AND CORRESPONDENCE_FILE 2

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'19 SECOR `` wwwsecor corn v INTERNA* ''NAL 3017 Kilgore Road.Suite 100 S E C O R INCORPORATED Rancho Cordova,CA 95670 916-861-0400 'rEL 916-[8661-0430 FAX �nl C.E7� l 1\J i I,L IJ February 21, 2008 FEB 2 5 2008 Ms. Margaret Lagorio ENVIRu,'VfblEnlT HEALTH San Joaquin County Environmental Health Department (SJCEHD) PERMIT/SERVICES 304 East Weber Ave 3rd Floor Stockton, California 95201-0388 RE: Status of Well MW-3 76 Service Station No. 5886 2701 West March Lane, Stockton, California SECOR Project No.: 77CP.01487.40 - 0304 Dear Ms. Lagorio: As you requested in your letter dated December 28, 2007, on behalf of ConocoPhillips, SECOR International Incorporated (SECOR) has investigated the construction details and depth to bottom discrepancies for well MW-3 located at site 5886, 2701 West March Lane, Stockton, California. In their last quarterly report, dated January 4, 2008, TRC field personnel indicated that well MW-3 was 9.73 feet deep, and that depth to water was 6.61 feet. The drilled and installed depth of this well, as indicated on the boring logs, was 25 feet below ground surface. On February 13, 2008, SECOR's technician went to the site to investigate depth to bottom discrepancies in well MW-3 and reached a total depth of 24.77 feet below ground surface using a depth to water meter. The depth to water was 5.39 feet. SECOR's technician also inserted clean 0.75-inch diameter PVC casing and probed inside of well MW-3 to search for obstructions or sediment. None were detected near depths of 8 to 11 feet. Then SECOR's technician assembled 25 feet of clean 0.75-inch diameter PVC casing, and probed inside of the well MW-3 for obstructions to the total depth of approximately 25 feet. No obstructions or sedimentation were detected. On February 13, 2008, SECOR contacted TRC via email and requested that TRC investigate this issue, and the possibility that TRC had been monitoring a nearby tank pit well instead of MW-3. On February 14, 2008, SECOR received an email from TRC stating that it did seem feasible that they could have monitored the wrong well.