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1 <br /> 30 July 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 9 of 16 <br /> 3 3 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 a California Department of Health Services (DHS)-certified laboratory for analysis _ F <br /> for <br /> TPH-g and TPH-d by EPA Methods 5030B/8015Cm and 3510C/80I5C, respectively, and <br /> o MTBE by EPA Method 8021B <br /> 3 4 WELL ELEVATION SURVEY <br /> On 10 June 2004, a state of California state-licensed survey engineer from Baumbach&Piazza,Inc <br /> (BPI) surveyed/resurveyed reference points on the top of the well casings from wells MW-1 through <br /> MW-19 to the nearest 0 01-foot relative to known National Geodic Survey Datum No C464 <br /> (NAVD88) Additionally, BPI utilized global positioning system (GPS) techniques to identify <br /> latitude and longitude for tracking wells MW-1 through MW-19 on the State Water Resources <br /> Control Board (SWRCB) GeoTracker database system The results of the monitoring well survey <br /> are contained in Table 1 The surveying report (BPI Job No 97-0249) is presented in Appendix I <br /> 3 5 FINDINGS <br /> Groundwater elevation, flow direction and gradient were determined from field data collected on <br /> 14 June 2004,the contaminant impact to ground water was quantified by laboratory analysis of water 4 <br /> samples collected on 14 and 15 June 2004 <br /> 3 5 1 Ground Water Elevation and Gradient <br /> The depths to ground water were measured at between 12 29 feet(MW-18)and 16 62 feet(MW-9C) <br /> below the tops of the well casings on 14 June 2004, ground water elevations were calculated to be <br /> between 1 58 feet (MW-13B) and 2 85 feet (MW-10E) below mean sea level (MSL) <br /> Ground water elevation data collected from Flag City Chevron wells MW-9(A-C), MW-11 (A-D), <br /> MW-13 (A-D), MW-16, MW-17, MW-18 and Three B's Truck Plaza wells MW-6, MW-9 (A-E) <br /> and MW-10 (A-F)on 14 June 2004 was depicted on cross section GC'(Figure 3), by determining <br /> the difference between ground water elevations (dh) and dividing by the difference of the screen <br /> interval midpoints (dl), the vertical gradient between adjacent screen intervals was calculated <br /> Generally, nearly flat, very slight upward and downward vertical gradients were observed between <br /> Advanced Geo Environmental,ine <br />