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10 November 1999 <br /> AGr-NC Project No. 98-0433 <br /> ' Page 4 of 13 <br /> investigation location was clearly narked and a utility clearance was obtained through Undergrourid <br /> Service Alert. <br /> 3.5,1. SOIL SAMPLE COLLECTION ANT) ANALYSTS <br /> ' Un 19 and 20 August a total of five soil borings (MW-1 through MW-5) were advanced utilizing ; <br /> hollow-sten]auger drilling techniques. All of the soil boring were subsequently completed as ground <br /> ' 'water monitoring wells. <br /> Soil boring and monitoring well locations, shown on Figure 7., were located on the east portion of <br /> the site at and surrounding t1]e approximate location of the former gasoline dispenser. Soil boring <br /> former US'h location. Soil boring MW-2 was established at <br /> MW-1 was advanced directly south of <br /> the southern end of the former UST dispensers, northwest of boring i\VIW-,1. Soil boring 1Vl'W-3 was <br /> established approximately 140 feet west of the homier dispernser location, and soil boring MW-4 was <br /> established at the northern end of the fofmL] r USW dispensers. Soil boring l\4W-5 was established <br /> approximately 140 feet west of the former dispensers. . <br /> Machpoil boring was advanced to a depth of 30 feet bsg. '.1-hese soil borings were advanced as a pilot <br /> s a � <br /> boring for collection of soil samples to characterize the subsurface sail prof-Ile arid identify water- <br /> bearing units for monitoring well screen placement. Installation of the �,vas performed using <br /> a true-n]oul]ted CMI; 75-HT drill rig equipped with 4-inch continuous !light hollow-stern augers. <br /> The drill rig and two-marl crew were supplied by Soil Exploration] Services (SES) of Sacramento, . <br /> ' California, Samples %were collected from borings MW-2 through MW-5 at five-foot intervals usin�ry <br /> a California-modified split spoon sampler loaded with three clean, 2 Y 6-inch brass sleeves. A 140- <br /> pound hammer paras used to advance the sampler 18 inches;the number of blo%vs required to acivance <br /> ' the sampler over each 6-inch increment was recorded on the boring logs. <br /> Samples were collected 6:0111 boring MW-1 using a five-foot soil core barrel set to advai]ce with the <br /> lead auger. Soil sampic were collected in 2 X 6-inch brass steeves at significant lithologic changes <br /> ol- at a r]'11 n177 <br /> rum jive-loot InterVal. All sampling cqulpl]]ent\vas washed .In an Alconbx'soludon and <br /> ' rinsed twice with Nvatcr prior to each Sa1np11I]g run, <br /> Both. ends of the soil sleeve of each san]ple collected for laboratory analysis avert co%',cred with <br /> . Teflon sheets, capped and scaled with tnpe. The selected san]plcs were stored in a chilled container <br /> and transported ru]dcr chain-of-custod}r to 11eCarnpbell Analytical, 1i]c. (MAI), a Calii'orn'. <br /> Dcpartn}ent of Health Services (Li:tS)-certified analytical laboratory located irl Pacheco; California. <br /> ' selected sampics ,vcrc analyzed For: <br /> {dreturc'rlGar[�.tnirc>ttsncstL•tl, lnc. <br />