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AN 29 '94 08:28 GEOAUDIT 007 Poe Monitormg wells, located approximately M mile north of the subject site, installed znd manintaiaed by OeoAudit, indicated a depth to groundwater of approximately 64 feet in ?ebrumy of 1994. S.K Tt4:cZV&"'O3 Rmcoeum On Jane 6, 1994, the existing tank cavity was overexcavated to remove residual soil cmtamination. The excavator and operator were supplied by Bob Evans TrucMng of Mnntaca.,California.A photo-ionization detector(PID:Thermo Environmental Instruments, Inc. 580A, 10.0 e.V., calib ated to isobutylene) was used to monitor organic vapors during e=vntiaa procedures. The e:mavatlon was expanded approximately 2 feet to the south and west,excavation in the south and west directions wzs limited due to the property line(see Figure 2).The excavation was extended to a depth of approximately 15 feet No groundwater w-ns encountered during excavation. The excavated soil was stockpiled east of the excavation and existing steclirpile. Approximately 100 cubic yards of soil were removed from the excavation. 3.2 1 Soil Sample Collection and Anatysls Upon termination of excavation, three samples were collected from the floor,the west wall and the south wall of the excavation(B1-15, WI-9 and S1-11)_ Samples from the excavation were collected from the excavator bucket using a metric soil sampler.Two samples were also collecWd from the stoaLpiled soil. Sample locations are shown on Figure 2. Samples were collected in clean, 2 by 3-inch brass sleeves_ The-ends of the sleeves were . covered with aluminum sheets, capped and sealed with tape. The samples were stored on ice and transported to McCampbell Analytical Inc. iIn Pacheco_ The two stockpile samples were composited at the laboratory for aualys s. a The samples were analyzed for total petroleum hydmearbom(ITH as gasoline and diesel) and BTiE&X in accordance with EPA methods 8015m and 8020, respectively. 4.0 DTT DIrdGS d T?F— as gasoline was detected in sample S1-11 (south wall. of excavation, 11 fleet) at a concentration of 1.,1 mgfkg(parts per million,ppm).Xylenes were detccted in the composite d stocapil; sample at 0.029 ppm. No other petroleums hydrocarbons were detected in any of the samples.Analytical results are summarized on Table 1.The Laboratory report and chain M of custody are included in Appendix A. 4 r,