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Ultramar Station No 494 10 • February 20, 1997 Stockton California Monitorina Well Abandonment Report L • The former location of MW` 4 was patched to city requirements with asphalt by Bonadonna's Asphalt Repairs of Stockton That location was inspected and approved by a City of Stockton, Public Works Department inspector on February 6, 1997 Horizon personnel collected soil samples on February 6, 1997 from an existing soil pile onsite as well as from the drill cuttings that were generated during the abandonment procedures Four discrete soil samples were collected from each soil stockpile by removing approximately 12 to 18 inches of soil from the outside of the stockpile and driving a clean brass sleeve into the soil at randomly selected locations Samples were sealed, labeled and placed in chilled storage for transportation to the lab Soil samples collected were transported to Western Environmental Science and Technology (WEST) Lab in Davis, California where they were composited and analyzed for Total Petroleum Hydrocarbons as gasoline and the volatile aromatics benzene, toluene, ethylbenzene, xylenes Samples collected from each stockpile were composited and analyzed seperately Laboratory analysis reported the samples as non-detectable for the constituents mentioned above Copies of the laboratory data sheets and the chain of custody are included as an attachment to this report The soil piles were loaded and transported to the Ultramar refinery in Hanford, California by M P Environmental of Bakersfield, California for use as fill A copy of this letter report should be forwarded to • Mr Gordon Boggs Mr Michael Tnfurna Jr California Regional Water Quality Public Health Services Control Board-Central Valley Region Environmental Health Division 3443 Routier Road 304 East Weber Avenue, Third floor Sacramento, California 95827 P O Box 388 Stockton, California 95201 • i 1494-13 abd 2 HORIZON ENVIRONMENTAL INC