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Monta Brothers Service Station 14 July 16, 1992 <br /> lip <br /> of groundwater characterization Drilling for all borings will be accomplished using <br />' a truck mounted CMETm 75 drill ng or equivalent utilizing 8 314-inch outside diameter <br /> hollow-stem augers Th — __ he _a max�mim "devt i 25— t-belor ] <br /> the�ftrst~~-� —ground--water;—or—approxzmatcly 75—feet_ .below surface grade <br /> Soil sampling will be performed while drilling the borings at a five foot interval <br /> beginning at 5 feet below grade to the designed termination depth Soil sampling <br />' will be accomplished using a split-spoon sampler (ASTM D 3550 with shoe similar to <br /> ASTM D 1586) equipped with three 6-inch by 2 5-inch diameter brass sleeves for soil <br /> retention The soil samples will be obtained by driving the sampler with a one <br /> hundred and forty pound hammer dropping thirty inches in accordance with ASTM D <br /> 1586. <br /> ' 1 <br /> The lowermost sleeve at each sample interval (corresponding to approximately 6 <br /> inches below the actual sample interval) will be screened for total organic vapors <br /> with a portable photo-ionization detector (PID) or a Foxboro@ OVA (organic vapor <br /> ' analyzer) 108 flame-ionization meter (FID) Headspace vapor analysis will be <br /> performed by first discarding a portion of the soil retained at one end of the sleeve to <br /> produce a headspace The sleeve is then capped and the probe of the PID or FID <br /> inserted through a hole in the cap and into the headspace for analysis The PID or <br /> FID readings will be recorded on the boring log The uppermost sleeve will be <br /> observed for lithology <br /> ' The middle sample sleeve of the sampler will be immediately sealed with Teflon <br /> film, capped, labeled, and placed on ice at 40C for transport to a California Department <br /> ' of Health Services (DHS) certified laboratory Strict chain-of-custody procedures will <br /> be utilized for all samples collected to ensure sample integrity and to document <br /> sample possession from the time of collection to the final destination Two samples <br /> collected from the boring will be retained for possible laboratory analysis <br /> All sampling equipment will be washed with TSP (tri-sodium phosphate) cleanser, <br /> and rinsed with tap water and de-ionized water prior to sampling, between sample <br /> intervals, and between borings to reduce the possibility of cross-contamination The <br /> EB-8101-3 9207-E037 WP <br />