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TABLE D-1 <br /> Samples Submitted for Analysis <br /> Boring ID Depth Analyses EPA Method <br />' MW-4 30' TPH-G, BTEX' 8015/8020 <br /> 40' TPH-G, BTEX 8015/8020 <br />' MW-5 30' TPH-G, BTEX 8015/8020 <br /> 40' TPH-G, BTEX 8015/8020 <br />' MW-6 30' TPH-G, BTEX 8015/8020 <br /> 85' TPH-G, BTEX 8015/8020 <br />' 1 TPH-G = Total petroleum hydrocarbons as gasoline <br /> BTEX = Benzene, toluene, ethylbenzene, and xylenes <br /> I <br /> Headspace screening for VOCs was performed on the soil contents from one of the brass liners <br /> from each five foot sample interval The headspace screening technique involved placing a <br /> portion of each sample into a clean, resealable plastic bag and promptly sealing the bag After <br /> a minimum of five minutes, to allow for volatilization of any constituents that may have been <br /> present, a portable photoionization detector (HNu) probe was quickly inserted into the bag and <br /> a measurement was recorded. Results of the headspace screening are presented on each monitor <br /> well log The HNu was calibrated daily using isobutylene as the calibration gas <br /> To reduce the potential for cross contamination, augers, sampling equipment and all associated <br /> downhole equipment were decontaminated prior to each use Auger flights were decontaminated <br /> by steam cleaning while split-spoon samplers, brass liners and associated downhole equipment <br /> were washed in a solution of Alconox detergent and potable water, followed by a double rinse <br /> with potable water and a final rinse with deionized water All decontamination rinsate was <br /> Icontained in a 700-gallon Baker tank for temporary onsite storage <br /> Soil cuttings from the borings were placed on the existing onsite stockpile <br /> IWell Construction <br /> Upon completion of drilling and sampling activities, the bonngs were converted to monitor <br /> wells <br /> ITwo-inch-diameter, Schedule 40 PVC pipe was used to construct the monitor wells The <br /> screened interval was 20 feet Iong in each well and consisted of 0 020-inch machine-cut slotted <br /> screen A threaded PVC end cap was affixed to the bottom of the screen sections to prevent <br /> formation material from entering the well casing through the bottom Sections of blank casing <br /> (85 feet for MW-4 and 84 feet for MW-5 and MW-b) were subsequently joined to the 20 foot <br /> section of slotted casing The top of the slotted well screen was placed at approximately five <br /> T <br /> ISTKCUUT,5SAREG3QTR WP D - 3 I1/12!92 <br />