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� The first round of sampling and analysis that included all four wells was conducted in f January 1994 Laboratory analysis of the MW-1 sample found no detectable hydrocarbon constituents or lead Analysis of the MW-2 sample detected 0 46 mg/l TPH-d, 1.9 mg/1 TPH-g, 0 41 mg/1 benzene, 0 024 mg/l toluene, 0.11 mg/1 ethylbenzene, and 0.059 mg/l xylenes Lead was not detected. The MW-3 sample analyses showed 0 086 mg/l TPH-d, 0 0.12 mg/1 TPH-g, but no detectable BTEX constituents or lead. The analyses for the MW-4 sample showed 0.34 mgtI TPH-d, but no other detectable hydrocarbon constituents or lead No other constituents were found above the laboratory MDU The most recent round of sampling and analysis was conducted in April 1994. Laboratory analysis detected of the MW-1 sample found no detectable hydrocarbon constituents or lead Analysis of the MW-2 sample detected 0 56 mg/l TPH-d, 17 mg/1 TPH-g, 0 46 mg/l benzene, 0.015 mg/l toluene, 011 mg/1 ethylbenzene, and 0 048 mg/l xylenes. The MW-3 sample analyses showed 0 052 mg/1 TPH-d, 0 00057 mg/1 benzene but no other detectable BTEX constituents The analyses for the 1-. W4 sample showed no detectable hydrocarbon constituents Lead was not analyzed in this round of analyses No other constituents were found above the laboratory MDLs. Purging and sampling logs for April 1994 are presented in Appendix D The results from this round of sampling and analysis were comparable with those detected in January 1994 Both the January and April rounds of groundwater analyses showed roughly an order-of-magnitude decrease in constituent levels compared to those detected prior to the excavation activities and destruction and sealing of the EMCON wells Drawings 4-1, 4-2, and 4-3 provide isoconcentration plots of the April 1994 TPH-d, TPH-g, and benzene, respectively A map illustrating groundwater flow direction and gradient for April 1993 is included as Drawing 1-3 FAv-Y OSF 4 4-3 92-1177102 36