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ME <br /> .«�.-m. � � <br /> w " _..3'�`=".�.. ' RON <br /> '- <br /> ri <br /> 3.2 SOIL SAMPLING <br /> In-situ soil samples were largely taken in the presence of San Joaquin County <br /> i . Public Health Services Department personnel. Samples were taken as follows: <br /> r • At a minimum of two per UST, at a depth of two feet beneath the top <br /> i , 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 /> i depth of two feet, in native material beneath the pipe(s) (six <br /> samples) <br /> ° :rom the corners and center of the bottom of the "new" UST <br /> excava-tion, at a depth of two feet in native material beneath the bottom of <br /> the excavation (five samples) <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 /> fc, <br /> Tank and piping types, sizes and sample numbers are shown in Table 1 and <br /> detailed maps of sample locations are shown in Appendix 5, <br /> Soil ;samples were taken, in the presence of San Joaquin County Public Health <br /> Department personnel, by driving a decontaminated brass cylinder into sola <br /> r , 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 /> r Samples were immediately capped with aluminum foil and then plastic caps. <br /> They were then labell,.d, placed inziploc 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 i:ifferent locations, dug <br /> I from depths of one foot or greater into stockpiles. Each composite sample <br /> bw <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 /> material. Stockpile sampling, analytical results, treatment and disposal and <br /> �- discussed in Section 5.0. <br /> .r <br /> a <br /> � :ENG:9199/041591 <br /> ,i <br />