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03 June 2002 <br /> AGE-NC Project No. 97-0360 <br /> Page 4of7 <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified; <br /> --� a BTEX and MTBE in accordance with EPA Method 8021; and <br /> • . MTBE, DIPE, ETBE, TAME, TBA, EDB and 1,2-DCA in accordance with EPA Method <br /> ' 8260 Modified. <br /> 2.8. WELL HEAD SURVEY <br /> On 01 May 2002, a California state-licensed survey engineer from Baumbach & Piazza, Inc. <br /> surveyed the elevation of a reference point on the top of ground water monitoring wells MWI <br /> = through MW5 and EW 1 to the nearest 0.01-foot relative to City of Tracy Bench Mark Datum dated <br /> 1987. The results of the monitoring Well survey are contained in Table 1. The surveying report. <br /> (Baumbach&Piazza, Inc.) is presented in Appendix D. <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 11 February 2002;the contaminant impact to soil and ground water was quantified by the laboratory <br /> analytical data. <br /> !" 3.1. STRATIGRAPHY <br /> Generally, gray to brown, damp to saturated, clay was encountered from surface grade to <br /> approximately 20 feet bsg in well borings MW4, MW5 and EW1, from surface grade to <br /> -� approximately 15 feet'bsg in well borings MWI and MW3 and from 25 feet to 30 feet bsg in well <br /> boring MW2. Dark brown, saturated,silty sand was encountered from 15 feet bsg to 20 feet bsg in <br /> well borings MWI and MW3 and frozn30 feet to 35 feet bsg in well boring MW2. Lines of cross <br /> section are illustrated on Figure 2 and stratigraphic cross sections are depicted on Figures 4 and 5. <br /> Organic vapor was detected in the soil samples collected from borings MW 1,MW4,MW5 and EW I <br /> at concentrations as high as 121 parts per million (ppm), from soil sample EWl-15. The PID data <br /> is included on the boring logs (Appendix A). <br /> E <br /> i <br /> Advanced GcoEnvironmental,Inc. <br />