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s <br /> 5 July 1995 <br /> AGE-NC-95-0124 <br /> Page 4 of 6 <br /> 3 5 EXCAVATION BACKFILLING <br /> On 13 May 1994, approximately 162 tons of 318" pea gravel were imported and placed in the <br />' excavation Approximately 60 cubic yards of excavated soil was determined to be "clean" and was <br /> also placed into the excavation The "clean" soil was excavated from the top 5 to 6 feet of th5 <br /> excavation a �� <br /> 36 DISPOSAL OF HYDROCARBON IMPACTED SOIL <br /> On 13 July 1994, the stockpiled soil was transported off-site for disposal Approximately 144 cubic <br /> yards of soil were removed from the site by BET and disposed at Forward, Inc in Stockton, <br /> California Drums containing auger returns from previous work at the site were emptied, placed on <br /> the stockpile and transported with the contaminated soil Soil transportation and disposal records are <br />' included in Appendix C <br /> 3 7 SOIL BORING DRILLING, 1 JUNE 1995 <br /> In a letter dated 6 September 1994, the PHS-EHD stated that "the remaining contamination beneath <br /> the building [to the west] must be defined laterally and vertically Sufficient data to estimate the mass <br /> of remaining contamination shall be obtained " <br /> 1 <br /> On 1 June 1995, one soil boring (134) was drilled inside the on-site building, 20 feet west of the <br /> former UST area The boring was drilled to a total depth of 40 feet usingf a B-34 drill rig equipped <br /> with 8-inch diameter hollow stem augers The drill ng and two-man crew were provided by Turner <br /> Exploration of Rancho Cordova, California <br /> t <br /> Samples were collected ahead of the drill bit using a split spoon sampler loaded with three pre- <br /> cleaned, 2 by 6-inch brass sleeves The lead brass sleeve was preserved by covering both ends with <br /> Teflon sheets, capping and sealing with tape The samples were then placed in a chilled container and <br /> 1 transported to MAI for analysts <br /> 1 <br /> Soil in the remaining brass sleeves was extruded and screened for the presence of organic vapors <br /> 1 using a PID The sail was then logged in accordance with the Unified Soil Classification System The <br /> boring log for B4 is included in Appendix A <br /> No organic vapors or hydrocarbon odors were noted in soil samples from B4 Three soil samples <br /> ' from B4 were analyzed for TPH-g and BTE&X in accordance with EPA methods 5030/8015 and <br /> 8020, respectively Petroleum hydrocarbons were not detected in the soil samples analyzed <br /> k <br />