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------------- <br /> ---------------- <br /> between 25 and 35 feet. Therefore, three monitoring wells were installed at the site. <br /> On August 30, 1994, three additional borings were drilled at the site to depths of 49 feet <br /> f and completed as 2-inch groundwater monitoring wells MW-1, MW-2 and MW-3. A total <br /> of 13 soil samples were analyzed for TPH as gasoline and BTE&X. <br /> Hydrocarbon odors were noted in soil samples from B-1, MW-2 and MW-3. No organic <br /> ! vapors were detected in MW-1. Laboratory analysis detected TPH as gasoline in 6- of the <br /> 13 samples analyzed. TPH as gasoline and BTE&X were detected in all four soil samples <br /> from B-1. The highest concentration of gasoline was detected in B-1 at a depth of 30 feet <br /> -� (B1-30). <br /> TPH as gasoline and BTE&X were detected in two samples from MW-3; toluene was <br /> detected in one sample from MW-2; and xylenes were detected in three samples from MW- <br /> 2. No petroleum hydrocarbons were detected in samples from MW-1. The analytical results <br /> are summarized in Table 1. <br /> 2.4 Groundwater Monitoring <br /> On September 2, 1994, the groundwater depths in all wells were measured relative to the <br /> top of the casing using a Solinst water level meter. (Table 2). The groundwater gradient was <br /> i calculated to be 0.0029 ft/ft directed S 76° E. <br /> Results of the initial groundwater samples indicated that TPH as gasoline was detected in <br /> MW-1, MW-2 and MW-3 at concentrations of 280 ppb, 9,500 ppb and 1,200 ppb, <br /> respectively. Benzene, toluene, ethylbenzene and xylenes were detected in samples from <br /> MW-2 and MW-3 at concentrations up to 1,600 ppb (toluene, MW-2). No BTE&X were <br /> detected in MW-1. The analytical results of all groundwater samples-are summarized in <br /> Table 3. <br /> 3.0 PROCEDURES <br /> i <br /> 3.1 Monitoring Well Purge Procedures <br /> On December 9, 1994, the water level in each well was measured relative to the top of the <br /> casing using a Solinst water level meter (Table 2). After water levels were measured, a two <br /> } stage submersible pump was used to remove approximately 5 to� 6 gallons of water (a <br /> minimum of three well volumes) from each well. Temperature, pH and conductivity were <br /> measured at one-gallon intervals using an ICM model 52200 water analyzer. Stabilization <br /> data and field logs are included in Appendix A. The purge water was stored on-site in 55- <br /> i <br /> gallon drums. <br /> -1 C—I.Snl A.&I S—i—,I... 4 <br /> ti FAkhom o> 7-94 <br /> i <br />