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• Al through A3 will assess groundwater along the northern border of site 150 associated with construction activities and down gradient of the INS Site. • A4 will assess ground water down gradient along the railroad tracks • A5 through A6 will examine the ground water quality along the railroad tracks • A7 though A8 will look at ground water along the drainage ditch running along the southern border of the parcel • A9-A14 will examine ground water associated with the shooting range activities on parcel 151. 2.1.1 Boring Advancement The borings will be advanced using hydraulic direct push equipment to approximately 20 feet bgs, which is anticipated to intercept ground water contained within the first water bearing sandy zone. Gregg Drilling, based in Martinez, CA is contracted to do the work on July 1P through 14`t`, 2005. 2.1.2 Soil Sampling In the borings, soil samples will be collected continuously and described with regard to soil type, relative moisture, and color in accordance with the Unified Soil Classification System. Soil samples collected from certain borings and depths are proposed for laboratory analysis. The chemical analysis will depend on the previous investigations in the surrounding areas and suspected chemicals. 2.1.3 Ground Water Sampling and Analysis Grab ground water samples will be collected at the bottom of each borings. Upon reaching the desired depth in the boring, 5 feet of slotted PVC screen will be lowered into the boring to serve as temporary well casing. Ground water grab samples will be collected within the PVC screen using a bailer constructed of Teflon, PVC, or stainless steel. The ground water samples will be gently conveyed into laboratory-supplied containers for the appropriate type of analyses. The ground water sample containers will be sealed, labeled, and placed in a cooler containing ice immediately after collection. The samples will be transport to a state-certified laboratory under standard chain-of- custody protocols. 2.1.4 Boring Completion Upon completion of all sampling and data collection activities, the borings will be tremie grouted to ground surface using a mixture of neat cement and bentonite clay. The top of the boring will be finished similar to surrounding materials. There will be no wells to be constructed on site. All grouting activities will be coordinated with the San Joaquin County Environmental Health Department and supervised by a licensed inspector.