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i . 26 February 1996 AGE-NC Project No 95-0125 Page 3 of 6 I3 2 GROUND WATER SAMPLE COLLECTION On 19 October 1995, ground water samples were collected from monitoring wells MW-2, MW-5 and MW-6 Samples were retrieved from each of the wells using new disposable plastic bailers Each sample was collected in 40-m1 EPA vials and transported in a chilled container under chain-of-custody Ito Alpha Analytical Laboratories, Inc (AAL) in Ukaih, California Each sample was analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) in accordance with EPA methods 5030/8015m and 602, respectively 3 3 EXCAVATION OF HYDROCARBON-IMPACTED SOIL On 20 and 21 December 1995, approximately 370 cubic yards of hydrocarbon-impacted soil were excavated from the former UST area Soil was excavated using a backhoe, the backhoe and operator were provided by Bob Evans Trucking(BET)of Manteca, California Excavated soil was stockpiled on-site, north of the maintenance building Water was encountered in the excavation at a depth of approximately 8 feet below surface grade Excavation linuts are illustrated on Figure 2 A total of eleven soil samples were collected from the sidewalls and floor of the excavation All soil samples were collected from the backhoe bucket using a metric soil sampler loaded with two clean, 2-inch by 3-inch brass sleeves All samples were collected under the direction of Ms Margaret Lagono of the PHS-EHD ' After collection, both ends of leading sleeve were covered with Teflon sheets, capped and sealed with tape Samples were placed in a chilled container and transported under chain-of-custody to Castle Analytical Laboratory(CAL) in Atwater, California Samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 80151n and 8020, respectively 3 4 EXCAVATION BACKFILL On 21 and 22 December 1995, approximate] 128,tons of pea gravel and crushed rock were placed on the bottom of the excavation The pea gra el and crushed rock was used to fill the excavation above the free standing water in the excavation The excavation was then backfilled using clean fill sand Backfilling and compaction was performed using a loader The loader and operator were Isupplied by Bob Evans Tucking, Inc (BET) of Manteca, California Backfill transportation receipts are included in Appendix B