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17 October 2005 <br /> . AGE-NC Project No. 97-0327 <br /> ' Page 3 of 4 <br /> ' were calculated to be between 30.87 feet (MW-3) and 31.28 feet (MW-4) below mean sea level <br /> (MSL) (Figure 3). Ground water flow direction for the area bound by wells MW-1 through MW-4 <br /> was inferred as toward the south at a gradient of approximately 0.004 ft/ft. <br /> 3.2. ANALYTICAL RESULTS OF MONITORING WELL WATER SAMPLES <br /> ' A total of four ground water samples were submitted to CAL TECH Environmental Laboratory <br /> (CTEL), a DHS-certified laboratory, for analysis. TPH-g, TPH-d and BTEX compounds were not <br /> ' detected in any ground water samples collected. <br /> The fuel additive 1,2-DCA was detected only in ground water sample MW-4 at a concentration of <br /> 12 µg/1. <br /> No other fuel components were detected above the laboratory reporting limits.Analytical results of <br /> ' the ground water samples are summarized in Tables 3 and 4.The laboratory reports(CTEL reference <br /> No. CT214-0504287) and chain-of-custody forms are presented in Appendix B. _ <br /> 3.3. ANALYTICAL RESULTS OF DOMESTIC WATER WELL SAMPLES <br /> Grab water samples were not collected from off-site domestic water wells located at 451 and 452 <br /> North Lillian Avenue during this quarterly monitoring event. <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' The implications from the April 2005 ground water monitoring event are as follows: <br />' • Ground water flow direction at the site was inferred to be toward the south at a gradient of <br /> 0.004 ft/ft or less;previous ground water monitoring events at the site have determined the <br /> prevalent ground water flow direction to be towards the south-southeast. <br />' • Due to the low gradient at the site, slight variations in ground water measurements or <br /> changes of recharge/discharge of the local ground water could have modified ground water <br /> flow direction <br /> • The ground water elevation at the site was within the screened intervals of wells MWA <br /> through MW-4, which should yield samples fully representative of shallow groundwater <br />' conditions. w <br /> �j <br /> ,advanced GeoEnvironmental,Inc. <br />