Laserfiche WebLink
1 <br />. 20 November 1995 <br /> AGE-NC Project No 95-0184 <br /> Page 4 of 5 <br /> 13-11 will also be analyzed for TPH as diesel <br /> 11 Analyze three soil samples for physicochemical properties, general microbiological <br /> enumeration and selective enumeration (to assess feasibility of bioremediation) <br /> 12 Monitor auger returns and soil sample duplicates for the presence of volatile organics using <br /> a photo-ionization detector(PID) pre-calibrated to isobutylene <br /> 13 Log auger returns and soil sample duplicates in accordance with the Unified Soil <br /> Classification System <br /> 14 Place auger returns in 55-gallon DOT drums and store on-site pending analytical results of <br /> soil samples <br /> 15 Backfill bonngs B-6, B-7 and B-11 to surface grade using Portland Cement <br /> 16 Complete boring B-8 as ground water monitoring well MW-5 using 20 feet of 2-inch diameter <br /> slotted PVC screen The proposed monitoring well completion is illustrated in Figure 3 <br /> 17 Complete borings B-9 and B-10 as vadose-zone cluster wells Cluster wells will be completed <br />• with three separate PVC casings screened at distinct intervals Bentonite plugs will be <br /> installed to separate screen intervals A typical cluster well design is illustrated in Figure 4 <br /> 42 GROUND WATER SAMPLING <br /> 1 Survey the top of the well casing of MW-5 to the nearest 11100th of an inch to determine the <br /> elevation relative to existing wells <br /> 2 No sooner than 72 hours after installation of MW-5, measure to the nearest 0 01 foot, the <br /> static water level in all monitoring wells <br /> 3 Using a dedicated bailer or submersible pump, surge and purge each monitoring well At least <br /> three well volumes of water will be removed from each well to stabilize temperature, pH and <br /> conductivity, stabilization parameters will be measured at one-gallon intervals Ground water <br /> samples will be collected using polyethylene disposable bailers, samples will be collected in <br /> 40-m1 VOA vials preserved with hydrochloric acid and l-liter amber bottles <br /> 4 Label and log water samples on a chain-of-custody form <br /> 5 Store the samples in a chilled container and transport under chain-of-custody procedure to <br /> a state-certified laboratory for analysis Water samples will be analyzed for TPH-g and <br /> BTE&X m accordance with EPA methods 5030/8015m and 602, respectively Samples from <br /> MW-4 and MW-5 will also be analyzed for TPH-d in accordance with EPA methods 8015m <br />• 6 Store purged water in 55-gallon DOT drums on-site pending analytical results <br />