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f <br /> 1 1 <br /> 1 _ , ... , ,. .. • . .. J _. t t w. ' t,1 � f r _�, r y ' .. 3 ; a w k—^.S.. <br /> 1 4 <br /> 31 March 1998 <br /> AGE-NC-96-0235 <br /> Page 3 of 4 <br /> i <br /> findings and recommendations <br /> - <br /> 4.0. PROCEDURES <br /> 4 1 DRILLING AND SAMPLING <br /> ' - The following procedures will be performed for the installation of ground water monitoring wells s <br /> 1 Notify the PHS-EHD at least 48 hours prior to commencement of any work Additional <br /> drilling permits will be obtained , if nesessary <br /> 2 Mark bonng locations at least 48 hours in advance for an Underground Service Alert (USA) <br /> check of underground utilities or pipes <br /> 3 Advance two soil borings utilizing a truck-mounted drill rig and 10-inch diameter hollow <br /> stem augers to total depths of 45 feet bsg, advance one boring-using 8 25-inch hollow-stem <br /> augers to a total depth of 30 feet bsg Proposed boring locations are depicted on Figure 2 <br /> 4 Decontaminate all sampling equipment in an Alconox-solution and rinse with water prior to <br /> each sampling run Steam-clean auger flights before advancement of each boring <br /> 5 Collect soil samples at 5-foot intervals in each boring beginning at a depth of 5-feet bsg <br /> Samples will be collected using a California split-spoon sampler,'loaded with three 2-inch by <br /> 6-inch brass sleeves The sampler will be driven by dropping a 140-pound weight from a <br /> height of 30 inches The number of blow required to advance the'sampler in 6-inch <br /> increments will be iecorded on the boring log <br /> 6 Preserve soil in the lead sleeve by covering-both ends with Teflon sheets, capping, and <br /> sealing with tape <br /> 7 'Label and log samples on a chain-of-custody form <br /> 8 Store samples in a chilled container and transport to a state-certified laboratory for analysis <br /> - -- -- - Selected soil samples will be analyzed for=total petroleum,.hydrocarbons quantified ,as _ <br /> gasoline and diesel (TPH-g, TPH-d),for volatile aromatics (benzene, toluene, ethylbenzene <br /> and xylenes, BTE&X),with methyl tertiary-butyl ether (MTBE) and for oxygenated <br /> compounds in accordance with the EPA Methods 8015m, 8020 and 8260' , <br /> 9 Monitor auger returns and soil sample duplicates for the presence of volatile organics using <br /> an organic vapor meter equipped with a photo-ionization detector (PID) pre-calibrated to <br /> isobutylene <br /> • 10 Log auger returns and soil sample duplicates in accordance with the Unified Soil <br /> Classification System <br /> Advanced GroEnvironmental,Inc <br />