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I FLUOR DANIEL GTI .TASK 2: SOIL BORINGS/SOIL SAMPLING Fluor Daniel GTI will supervise the advancement of six hydraulically-driven angled borings to a true vertical depth of approximately 15 feet below ground surface,(BGS)using a truck-mounted direct-penetration GeoprobeTm rig at the locations shown on the site plan included in Attachment 1: Boring,locations may be adjusted in the field based on subsurface obstructions and general field conditions. The sampling rig will drive a 2-inch-diameter by 2-foot-long stainless steel barrel lined with 2-inch-diameter by 6-inch-long brass sample tubes or 2-feet-long clear plastic tubing at each location. Soil samples will be collected from the borings at 15 feet BGS. The'15-foot sample will be collected in native soil approximately 3 feet beneath the end of each of the three U3Ts. All sampling equipment will be steam cleaned prior to sampling the soil at each interval. Each soil sample will be screened for hydrocarbon vapors using a photoionization detector(PID). Soils encountered during drilling will be logged using the Unified Soil Classification System by a Fluor Daniel GTI field geologist,working under the supervision of a California registered.geologist. One sample tube from each sampling interval will be sealed with Teflon sheets, capped,taped,labeled, and placed on ice in an insulated container. Each sample will be analyzed by a State-certified.analytical'laboratory for benzene,toluene,ethylbenzene and xylenes(BTEX), methyl-tert-butyl-ether(MTBE); and.total petroleum hydrocarbons-as-gasoline (TPH-G)by EPA methods 8020/8015 modified, and Total Lead following EPA method 6010. Using the geoprobetechnology,'no soil will be generated during sampling::Watergenerated by.steam cleaning will be contained and temporarily stored on site in.DOT-approved 55-gallon drums pending characterization and disposal. TASK 3: GROUNDWATER SAMPLING Due to the shallow depth to groundwater, estimated to be 13 feet BGS,groundwater will likely,be encountered in the boreholes. If there is sufficient groundwater recharge in_the boreholes following extraction of the geoprobe sampling rods,water samples will be collected from two water-bearing borings and analyzed for BTEX, MTBE, and TRH-G using EPA methods 8020/8015 modified. If detected,the presence of MTBE in.the groundwater`will be confirmed using EPA method 8260. i