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LL • k 2u�J579-2106 - - - <br /> .. Sep 18 '98 1 :25 No .001 P.03 <br /> i <br /> A 3 8 Q C I A r E s 1 M C . <br /> L <br /> Ii <br /> On April 23, 1998, an ATC geologist supervised the advancem1ern of six soil borings <br /> below ground surface 095). Soil borings SB 1, SB2, and SB4 were placed in the vicinity of*tile <br /> former USTs, soil boring SB3 was placed in the vicinity of the former dispenser, and soil borings <br /> SBS and SB6 were placed at the southern edge of the former eicCavation arca. A site pian with <br /> soil boring locations is shown on Figure 2. Soil samples <br /> through 5B6 at five-foot intervals in acetate samplitbwere collected from borings SBI <br /> collected from each boringr� ues and�grab groundwater samples were <br /> . Analytical results indicated that the selected soil samples and the grab <br /> groundwater sample from boring SB6 contained detectable concentrations of petroleum <br /> hydrocarbons. The work is summarized in ATC's SummaryRegi of Subsurface Investigation, <br /> dated June 17, 1998. <br /> SCOPE OF WORK <br /> P1�'hand Permits, <br /> ATC will perform this scope of work under the existing soil borinig permit for the site. The permit <br /> application is attached to this workplan. ATC will also schedule field personnel and equipment, <br /> notify Underground Service Alert to locate underground utilities as required, and perform any <br /> other necessary field preparation and job start-up activities, <br /> dvancemen f it Borinig <br /> To try and evaluate the extent of impacted soil and groundwater in the vicinity of boring SB6, a <br /> minimum of three soil borings will be advanced to approximately 30 feet bgs. The proposed <br /> borings will be advanced east and south of boring SB6 to try and.fully delineate the lateral extent <br /> of impacted soil and groundwater. The estimated groundwater flow direction is north-northeast. <br /> If field conditions indicate that these borings are impacted then ATC will step out and advance <br /> additional borings. Proposed boring locations are shown on Figure 2. <br /> The borings will be advanced using truck mounted Geoprobe@ narrow diameter, direct push <br /> technology. Drilling will be conducted by a State-licensed (CS7) drilling company. A field <br /> geologist will be present to log all soil samples. Descriptions'of soil types encountered and <br /> sample collection intervals wiU be recorded on boring logs. Soil samples will be collected at five <br /> foot intervals or estimated changes in lithology, field screened with a Photoionizativn Detection <br /> (PID) meter, and an estimated two soil samples from each of the, borings will be submitted for <br /> laboratory analysis. Soil sample selection will be based on;}PID measurements and field <br /> observations(i.e. odor and soil discoloration). <br /> One groundwater sample will be collected from each boring at'�the depth groundwater is first <br /> encountered, anticipated to be approximately 20 feet bgs. A, Geoprobe@ Screen Point 15 <br /> Groundwater Sampler will be threaded onto the leading and of the Geoprobe when the <br /> w 113099Lepa,Mwkp7.aoo 2 <br /> i <br />