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TABLE B-i <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 801518020 <br /> 85' J TPH-G, BTEX 801518020 <br /> I TPH-G = Total petroleum hydrocarbons as ,gasoline <br /> BTEX = Benzene, toluene, ethylbenzene, and xylenes <br /> 1 <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 /> Ip 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 <br /> monitoring 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 /> contained in a 700-gallon Baker tank for temporary onsite storage. <br /> Soil cuttings from the borings were placed on the existing onsite stockpile <br /> Well Construction <br /> Upon completion of drilling and sampling activities, the borings were converted to monitoring <br /> wells <br />! Two-inch-diameter, Schedule 40 PVC pipe was used to construct the monitoring wells. The <br /> screened interval was 20 feet long 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 /> n%OkFVPMJRMART WP B - 3 OOMM <br />