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Monta .Brothers Service Station 3 August 21, 1992 <br />Drilling for all of the wells will be accomplished using a truck mounted CMETM 75 drill <br />rig or equivalent utilizing 8 314 -inch outside diameter hollow -stem augers The wells <br />will be drilled to a maximum depth of 15 feet below the first encountered ground <br />water, or approximately 75 feet below surface grade <br />Soil sampling will be performed while drilling the wells 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 25 -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 />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 FoxboroG 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 PTD 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 logs 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 (DOHS) certified laboratory Strict chain -of -custody procedures <br />will 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 each well will be retained for possible laboratory analysis One of <br />these samples will be from six inches above the groundwater surface <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 />EB -$101-3 <br />9208-EO46 WP <br />