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HORIZON ENVIRONMENTAL INC. �• �� Specialists in Site Assessment Remedial Testing Design and Operation .lune 20, 2005 Ms Vicki McCartney fa; ewt �v Environmental Health Department G 1 X 3/ r- San Joaquin County '0& 1 3 04 East Weber Avenue, Third Floor C-4 4 Stockton, California 95202-2708 Subject Replacement of Monitoring Well MW-1 Quik Stop Station No 076 1030 South Olive Street, Stockton, California Ms McCartney Horizon Environmental Inc (Horizon) has prepared this report documenting the replacement of monitoring well MWA at the subject site located in San Joaquin County as shown on Figure 1 (attached) In a letter dated August 23, 2004, the San Joaquin County Environmental Health Department (EDH) directed replacement of monitoring well MW-1 (as shown on attached Figure 2) because the integrity of the well was apparently compromised due to cement grout entering the casing during placement of the sanitary seal Horizon arranged for Gregg Drilling & Testing, Inc to replace the monitoring well Horizon submitted a work plan with well permit application to the EDH in a latter dated May 2, 2005 The EDH granted approval and issued well permit SR# 0042429 on May 23, 2005 EDH correspondence and permit are attached to this letter On June 1, 2005, Horizon oversaw Gregg destroy and re-install monitoring well MW-1 Prior to well destruction, depth to water in monitoring well MW-1 was 64 49 feet below top-of- casing Monitoring well MW-1 was originally installed as a 2-inch diameter casing in an 8- inch diameter boring to 75 feet below surface grade (bsg) Monitoring well MW-1 was drilled out with 8-inch diameter augers to a depth of 75 feet The boring was then over-drilled with 10-inch augers to a depth of 80 feet The replacement well was installed in the 10-inch boring as a 2-inch diameter FVC well with 0 020-inch machined-slotted casing set over the interval 60 to 80 feet bsg The wellhead was covered with a traffic-rated, 14-inch diameter well box set at '/4-inch above surface grade Construction details for monitoring well MW-1 are shown on the attached well construction diagram Four separate samples of the stockpile of well construction materials and soil were collected for disposal characterization The soil samples were submitted, with chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff, State of California certification #2236), combined into one composite sample and analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX) and the fuel oxygenate methyl-t-butyl ether (MTBE) by EPA Method 8260B No analytes were detected in the composite soil sample The analytical report is attached to this letter The stockpile 4970 Windplay Drive #C5 • El Dorado Hills CA 95762 • (916)939-2170 • FAX(916)939-2172 PO Box 5283 • Bakersfield CA 93388 • (661)589-8389 - FAX(661)589-1456