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Laboratory Analyses <br /> Laboratory analyses are summarized in Table 4-3. Complete <br /> laboratory analysis results and chain of custody forms are provided <br /> in Appendix G Figure 4-1 displays the estimated vertical extent of <br /> hydrocarbons in the soil. Figures 4-3 and 4-4 display the estimated <br /> horizontal extent of hydrocarbons in the soil at depths below the <br /> ground surface of 5 and 7 feet, respectively. Figure 4-5 shows the <br /> estimated horizontal extent of hydrocarbons in the groundwater. <br /> Laboratory analyses indicate the presence of gasoline, diesel, and <br /> associated compounds (BTEX) in both soil and groundwater No <br /> hydrocarbons and associated compounds were encountered in the <br /> soils or groundwater at MW-4A (beneath the warehouse building). <br /> Sods at MW-2A showed no detectable quantities of TPH-G or TPH-D <br /> Insignificant quantities of BTEX compounds (less than 0 02 ppm) <br /> were encountered at 10 feet No BTEX compounds were detected at <br /> 13 5 feet Thus, most of the hydrocarbon compounds were removed <br /> from this excavation during tank removal activities <br /> MW-1A showed a TPH-G concentration of 240 ppm of TPH-G at 5 feet, <br /> Pe and only 11 ppm at 7 5 feet Similar patterns are present with TPH-D <br /> and BTEX compounds TPH-D is 180 ppm at 5 feet and 11 ppm at 7 5 <br /> feet The concentrations of BTEX compounds diminish from between <br /> 4 and 31 ppm at 5 feet to less than 0 3 ppm at 7.5 feet. <br /> MW-3A also showed diminishing concentrations of hydrocarbon <br /> compounds with depth. TPH-D was not detected in this boring TPH- <br /> G was measured at 1,200 ppm at 7 5 feet but was not detected at 15 <br /> feet BTEX compounds diminish from between 6 and 83 ppm at 7 5 <br /> feet to less than 0 003 ppm at 15 feet <br /> Free gasoline product is present in MW-2A In the remaining wells, <br /> r TPH-G and TPH-D were encountered in only MW-1A (at <br /> f concentrations of 23 ppm and 2.8 ppm, respectively) MW-1A showed <br /> the highest concentration of BTEX compounds, ranging between 0.8 <br /> and 3 5 ppm. MW-3A showed BTEX concentrations ranging between <br /> 0 00052 and 0.0018 ppm. <br /> Organic lead was not detected in any of the soil or groundwater <br /> samples that were analyzed. Total lead was detected in all of the <br /> analyzed soil samples at concentrations between 3 and 4 ppm. In the <br /> 4-2 <br />