SITE INFORMATION AND CORRESPONDENCE

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$T*TS OF CALIFORNIA GEORGE DEUKMEJIAN.Governor CALIFORNIA REGIONAL WATE'-m-QUALITY CONTROL BOARD— CENTRAL VALLEY REGION "= 3443 ROUTIER ROAD ' SACRAMENTO.CA 95827.3098 ! VOW, I AUG 2 8 1987 NVI,RMI(/SERVICEESAL LTH PE 26 August 1987 Mrs. Jean Stump 22485 S. Corral Hollow Road Tracy, CA 95376 SAMPLE RESULTS, CHEVRON PIPELINE BREAK, TRACY, SAN JOAQUIN COUNTY Enclosed are the laboratory reports you requested in conjunction with the subject spill adjacent to your property. Included are a map with sampling locations and site information; sample results of your domestic well water; sample results of two dewatering wells along Grantline Road; and sample results of soils remaining on or adjacent to your property. The water samples from your domestic well were taken on 27 April, 4 May and 16 June 1987 (see Attachments A-1 thru A-3). On all three dates the samples were collected from the spigot at the north end of the well house. All samples were tested using EPA Test Method 602 (EPA 602). EPA 602 tests for the presence of purgeable aromatics such as benzene, toluene, and xylene (BTX) . These constituents are found in gasoline and detection of them in your well would indicate it has been impacted by the subject spill. Fortunately, all three rounds of sampling have shown nondetectable levels (<0.5 ug/1 ) of BTX. Attachments B-1 and B-2 are the results of water samples taken from dewatering wells 1 and 2 (DW-1 and DW-2) , respectively. These samples were taken on 27 April , before cleanup efforts. The results confirm the shallow ground water is contaminated. The subsequent cleanup performed by Chevron included some removal of contaminated ground water. Further cleanup is required and Pacific Asphalt is planning such action. Attachments Cl' thru C-5 are soil sample results. Soil samples were taken by Chevron after excavation and before backfilling with clean soil . Each sample (A thru 0) was a composite of four subsamples taken from an area approximately 10' x25' . The results show 10 ug/kg toluene, 100 ug/kg xylene and 840 mg/kg total diesel in Sample C. The amounts of toluene and xylene detected do not pose a threat to water quality. Since diesel was not involved in the spill this value is suspect and may have come from cleanup equipment leaks. The nondetected amounts in surrounding Samples A, B and 0 (see map) indicate the seriously contaminated soil was removed.