Laserfiche WebLink
' 05 January 2004 <br /> AGE-NC Project No 97-0333 <br /> ' Page 6of11 <br /> ' time, and sampler's initials <br /> 3 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain of custody form,placed in a chilled container and <br /> transported to Castle Analytical Laboratory, a DHS-certified laboratory for analysis for <br /> • TPH-g by EPA Methods 5030/8015M, <br /> ' • BTEX and MTBE by EPA Method 8020, and <br /> • Volatile organic compounds,including PCE,TCE, 1,2-DCA,EDB,MTBE,TAME,DTPE, <br /> ETBE and TBA by EPA Method 5030/8260 ' <br /> 3 5 QUARTERLY GROUND WATER MONITORING RESULTS <br />�' • Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 04 October 2004,the contaminant impact to ground water was quantified by laboratory analysis of <br /> ground water samples collected on 04 and 05 October 2004 <br /> 3 5 1 Ground Water Elevation and Gradient <br /> Depths to ground water were measured between 24 85 feet(MW-3,MW-5)and 28 00 feet(MW-7B <br /> through E) below the tops of the well casings on 04 October 2004, ground water elevations were <br /> ' calculated to be between 4 75 feet (MW-10D) and 7 03 feet (MW-3 and MW-5) above mean sea <br /> level(MSL),see Table 4 Based on current and previous monitoring data collected from wells MW-1 <br /> through MW-13,ground water elevation at the site generally decreased an average 0 52 feet between <br /> ' the June 2004 and the October 2004 ground water monitoring events <br /> ' Ground water elevation data collected from multi-level wells MW-11,MW-12 and MW-13 on 04 <br /> October 2004 is depicted on cross section F-F'(Figure 3) The vertical gradients between adjacent <br /> screen intervals are depicted on cross section F-F', the vertical gradient was calculated by <br /> determining the difference between adjacent screen interval ground water elevations (dh) and <br /> dividing by the difference of the screen interval midpoints (dl) Generally, a pronounced downward <br /> gradient was observed between the First Zone and the upper Second Zone at all three well locations, <br /> near neutral gradients were observed at all other locations <br /> The 04 October 2004 ground water elevation data collected from the Rainwater Car Wash site was <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br /> Y <br />