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Sand pack will extend from the bottom of the well toward grade for 17 feet, then a two foot Bentonite seal will be completed and the remaining annulus will be grout filled to grade. A traffic proof well cover or standpipe will complete the well construction. A typical well is shown in Appendix B. One monitoring well shal --located east of the former tank area, approximate aI-f" way-7b-etween the former tank a and the e presently on site. '------- - 4) Collect soil samples at each 5 ft level interval or at significant changes in lithology commencing at a depth of five feet, using a split spoon tube sampler loaded with pre-cleaned brass tubes. A maximum of 6 soil samples are anticipated to be collected. It is anticipated that one soil sample from each boring will be in the capillary zone. 5) Sampling equipment will be decontaminated using tri-sodium phosphate solution (TSP) and twice rinsed with the last rinse using distilled water prior to sampling. 6) Soil samples collected in the lowest brass liner will be preserved by covering both ends with Teflon tape, capping with plastic caps and sealing the caps with plastic tape. Soil samples will be labeled and logged under Chain-of- Custody (COC) control. Soil samples will be stored in a cooler with ice, transported to a state certified laboratory for analysis with COC documentation. 9) Soil cuttings will be stored on and covered with visqueen. 10) The borings will be logged by inspection of the samples and classified using the Unified Soil Classification System by a California Certified Engineering Geologist. 11) A minimum of three days after the installation of the wells, the wells will be developed by pumping, purging and collecting the purged groundwater in 55-gallon drums labeled awaiting analysis. Three groundwater samples, one from each well, will be collected by a clean dedicated bailer, placed in several 40 ml VOAs with Teflon septa, labeled, held in a cooled (4 Degrees C) ice chest and transported to a State Certified Laboratory, under COC documentation, for analyses. 12) The soil and groundwater samples collected will be analyzed for Total Petroleum Hydrocarbons as Gasoline (TPHG) and Benzene, Toluene, Ethylbenzene and Xylene (BTEX) . Analysis for OXYGENATE COMPOUNDS, other than Methanol and Ethanol will also be completed. The analysis will be in accordance with the CVRWQCB letter dated 18 July 1997 and revised 30 August 1997 with a copy attached as Appendix C. The groundwater samples will be analyzed for TPHG by EPA Method modified with purge and trap preparation 5030 (GC/FID) with detection limits of 50ug/1. EPA �I 2