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i �b 100 <br /> Ns� d a 3q <br /> k <br /> r - <br /> - 1 _ <br /> y <br /> r <br /> s + <br /> 3.2 SOIL SAMPLING <br /> i' In-situ soil samples were largely taken in the presence of San Joaquin County <br /> Public Health Services Department personnel. Samples were taken as follows: <br /> -� • At a minimum of two pe-- UST, at a depth of two feet beneath the top <br /> of native material beneath the tank (14 samples) <br /> At a minimum of one per 20 linear feet of fuel or oil piping, at a <br /> depth of two feet, in native material beneath the pipe(s) (six <br /> 'w samples) <br /> From the corners and center of the bottom of the "new" UST excava- <br /> tion, at a depth of two feet in native material beneath the bottom of <br /> the excavation (five samples) <br /> • <br /> From the side wall of the "new" UST excavation, at a depth of four <br /> ' feet and one foot in-from the sidewall, in native material, on the <br /> side closest to fuel pipes and USTs (two samples). <br /> Tank and piping types, sizes and sample numbers are shown in Table 1 and <br /> !,I detailed maps of sample locations are shown in Appendix B. <br /> k <br /> Soil samples were taken, in the presence of San Joaquin County Public Health <br /> Department personnel, by driving a decontaminated brass cylinder into soil _ <br /> ry using a decontaminated wood mallet. Most samples were driven into intact, <br /> bulky pieces of soil which had just been excavated with a two-yard bucket. <br /> This method was used where entry into the excavation might be unsafe. <br /> Samples were ims;lediately capped with aluminum foil and then plastic caps. <br /> They were then labelled, placed in ziploc bags and placed in a pre-iced <br /> insulated container for transportation to an analytical laboratory. <br /> Soil stockpiles were..sampled for characterization and disposal purposes by <br /> taking composite samples. Composite samples consisted of a decontaminated <br /> brass cylinder which was filled with soil from four different locations, dug <br /> from depths of one foot or greater into stockpiles. Each composite sample <br /> represented no more than 50 cubic yards of stockpiled material. For stock- - <br /> ¢ piles which contained materials removed from former UST or piping excavations, <br /> composite samples represented no more than 25 cubic yards of stockpiled <br /> j°`1 material. Stockpile sampling, analytical results, treatment and disposal and <br /> discussed--in-Section-5-#O.- -- -- --- <br /> Ul.ENG:9199/041591 <br />