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APR 06 '94 08 18 Si le P.3 RIEDEL ENVIRONMENTAL SERVICES INC 4.2 Soil Sample Analyses The confirmation samples were relinquished to the State certified mobile laboratory operated by Argon, for on-site analysis. The nine confirmatory soil samples (EXP-01-1,-2c,-3; EXP-02-1,-2c,-3, and EXP-03-1,-2c,-3)were analyzed for total petroleum hydrocarbon as diesel (TPHd) by DHS/EPA Methods 3550/8015 and the fuel components benzene, toluene, ethylbenzene, and xylene (BTEX) by EPA Method 8020. The results of the on-site analytical testing indicated that detectable concentrations of TPHd or BTEX not resent in eight of the nine samples obtained from the bottom of the US�`` excavat>Eon. However, samp a EXP - contain 2,900 fpm TPlid. Copies of the laboratory report sheets and the accompanying c n-custody document are provided �n Appendix B A summary of the soil sample analytical results are presented in Table 1. S.0 OVER-EXCAVATION AND ADDITIONAL CONFIRMATORY SAMPLING 5.1 Over-Excavation On 11 Nove %over-excavation of the bottom of the UST pq to a depth of 17.5 feet below grade was conducted by Aronson in the area from which soil sample EXP-02-3 had been obtained. A total of approximately l20 cubiq-yards_.of excavated soil was transported to Forward landfill in Manteca, California, in 6 truckloads by Valley Material Transportation. Approximately 20 cubic yards of the excavated soils, which contained greater concentrations of residual diesel fuel, were temporarily placed in the western end of the excavation. The 20 cubic yards of soil were subsequently loaded and transported (on 17 November 1994) in one truckload by Valley Material Transportation to the Gibson Environmental facility located in Bakersfield, California. Copies of the Non-Hazardous Waste Manifests and the Gibson Environmental Non-Hazardous Waste Data Form for the transportation and disposal of the soils are included in appendix A. 5.2 Second Confirmatory Soil Sampling and Analysis On 12 NQy=ber I993�RES and Pacific Bell personnel meet with Ms. Mary Meays, REHS of the Public Health Services of San Yoaquin County to discuss and to formulate a sampling pian for the soils to the area of the over-excavation. A plan was developed and 8 soil samples were retrieved from the bottom of the excavation utilizing a manually operated slide hammer sampling device. The samples were obtained approximately 2.5 feet below top of the tank ue-downs at a depth of approximately 17.5 feet below grade. All sample locations were determined by Ms. Linda Turkatte, REHS of the Public H th Services of San Joaquin County. The 8 samples were relinquished to Argon for on-site analysis. The confirmatory sample locations are shown on Figure 4. r4'n5-931SWJr%P9-$T0KK Rrr%21MAR% 3 a'