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CHANGE IN HYDROCARBON LEVELS <br /> Sampling Location 3-Dec-93 4-Jan-94 3-Feb-94 2-Mar-94 3-May-94; <br /> MP-Well: MP' <br /> Benzene (mg/L) 0.130 NIS NIS NIS 0.120 <br /> Total BTEX (mg/L) 0.35 NIS NIS NIS 0.17 <br /> GRO (mg/L) NIS NIS NIS NIS 0.44 <br /> WP-3: MP <br /> Benzene (mg/L) NIS 0.096 0.005 0.034 0.035 <br /> Total BTEX (mg/L) NIS 0.152 0.009 0.050 0.045 <br /> GRO (mg/L) NIS 0.4 ND(0.1) 0.14 0.11 <br /> WP-3: MP (Duplicate) <br /> Benzene (mg/L) 0.038 <br /> Total BTEX (mg/L) 0.054 <br /> GRO (mg/L) 0.12 <br /> WP-1: SA2 <br /> Benzene (mg/L) 0.200 NIS NIS ND(0.0025) 0.019 <br /> Total BTEX (mg/L) 0.21 NIS NIS ND 0.019 <br /> GRO (mg/L) NIS NIS NIS ND(0.2) ND(0.1) <br /> ' Magnesium Peroxide Site: WP-3 located 5 feet down-gradient from magnesium peroxide injection point <br /> (MP-Well) <br /> 2 Sparging array site: WP-1 located 5 feet down-gradient from sparging line. <br /> NIS Not sampled <br />