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NOW San Joaquin Local Health District ,.' f 202/799-5005 . 01 Vdf 1 June 17 , 1988 Page 2 JUN 2 0 L089 CRWQCB-V) , GTI proposes to implement the �o � OMENTAL HEAM steps : Drill one deep soil boring and ten shallow borings to determine the presence and/or extent of soil contami- nation ( if encountered) through laboratory analyses of selected soil samples . Survey the existing well heads for elevation control to be used in conjunction with monitoring data to de- termine water level fluctuations, an estimated ground- water flow direction, and the local groundwater gradient . Collect water samples from the existing monitoring wells and submit to an analytical laboratory for analysis . Prepare a "Preliminary Report" following the CRWQCB-V guidelines that will include data from the afore- mentioned work steps and all work to date. WORK STEPS One deep soil boring would be drilled with a truck-mounted drill rig using 8-inch diameter hollow-stem augers . The boring would be completed to a maximum depth of 50 feet below surface grade and logged by a GTI geologist using the Unified Soil Clas- sification System (see Appendix I ) . The boring would be located in the middle of the old tank pit (see Figure 2 , Site Plan) . Soil samples from the boring would be collected during drilling at approximately 5-foot intervals, beginning at 5 feet below surface grade . Samples would be obtained using a 2 . 5-inch outside diameter (O .D . ) split-spoon sampler, lined with three 2- inch diameter by 6-inch long brass sample tubes . The sampler will be driven 18 inches ahead of the augers at each sample point . Each sample would be field screened by visual obser- vation and with a Photovac TIP photo-ionization detector (PID) . The collected samples will be sealed, capped, and placed on ice in an insulated cooler for subsequent delivery to an analytical laboratory accompanied by a Chain-of-Custody manifest . Ten shallow soil borings would also be drilled with the same equipment used to drill the deep boring. The borings would be completed to depths less than 5 feet below surface grade . The borings would be located in the vicinity of the old pump islands and product delivery lines (see Figure 2 ) .