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a <br /> iA September 1995 <br /> AGEMrNC Project No., 95w0167 <br /> Page 2 o£ 3 <br /> xp <br /> tl, er9..i WE O I ORM <br /> A subsurface investigation of the site is necessary to determine the lateral and vertical extent of <br /> hydrocarbon impacted soil and ground water, AGE proposes to install a three (3) probings at the site <br /> to detetrnine the extent of impacted soil. Pro'bings will be advanced using a Geoprobe, to depths of <br /> Hnpreaxiou ely 20 feet (ground water) . One probing will be placed near the former dispenser area; <br /> a secot;d probing will be placed within the former UST excavation; a third probing will be placed <br /> ror hcast of the former UST area. <br /> Sou samples will be collected from each probing at five-foot intervals, beginning at a depth of 5 feet <br /> I for the dklpenser-area probing and 10 feet for the other probutgs. A ground water sample will be <br /> 1 ooilected from the praising northeast of the UST area. <br /> 4.0, PROCEDURES <br /> For the collection of soil samples, the following procedures will be performed : <br /> 1 ) Notity the San Joaquin Couinty Environmental Public Health Services - Environmental Health <br /> Division, (Y1IS-' :11TH) 48 hours prior to commencement of any work. <br /> 21 Install three probings, using van-mounted, 1 . 1254nch diameter probe rods to depths of <br /> approximately ZO feet . The boring (probing) locations are depicted on Figure 2. <br /> Decontaminate sampling equipment in an alconox solution and rinse twice with water prior <br /> to each sampling run . <br /> t) O! tair. discrete soil samples at f ve-foot intervals, starting at 5 or 10 Peet, using Geoprobe soil <br /> sampler assembly loeded wits pre cleaned 1 . 125 -inch by 6-inch brass sleeves. <br /> 5) Preserve soil u-i the lead brass sleeve by covering both ends with aluminum foil, capping, and <br /> sealing with tape. <br /> 6) Store the samples under ice and transport the samples in a chilled container to a State certified <br /> laboratory for analysis. <br /> 7) Screen soil sample duplicates for the presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobulylene. <br /> 9) Collect one ground water sample from the probing northeast of the former UST area. The <br />