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i <br /> . stabilized after two consecutive purge volumes, and the well recovered to about 80% <br /> of the initial water level, the sample was collected from the well Purge water was <br /> stored on-site in drums A new disposable bailer was used to obtain the groundwater <br /> sample which was placed with minimum cavitation into the appropriate, laboratory <br /> prepared sample containers leaving no headspace The sample container was placed <br /> to a chilled ice chest for shipment to Priority Environmental Laboratory in Milpitas, <br /> California (a State Certified Testing Laboratory) under chain-of-custody <br /> documentation <br /> Groundwater Contour Map and Flow Gradient <br /> Groundwater contour map was prepared for the data listed in Table 1 above (see <br /> Figure 1) Groundwater elevation contours were plotted to a known/project datum <br /> from the measurements The groundwater flow direction was to the north- <br /> northwest under a calculated gradient of 0 003 <br /> Chemical Analytical Methods and Results <br /> Three groundwater samples were analyzed using EPA Methods 5030/8015 and 602 for <br /> Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene <br /> and Xylene (BTEX) The chain-of-custody and a the Laboratory Analysis Results can <br /> be found in Appendix C The analytical results of the groundwater samples revealed <br /> the following (see Table 2), <br />.� Table 2 Groundwater Chemical Analytical Data <br /> Well Date TPHG Benzene Toluene EthyIbenzene Xylene <br /> No Sampled ------------- ug/1 <br /> T-1 1/7/88 NA 00907 ND ND ND <br /> T-1 3/26/92 ND ND ND ND ND <br /> T-1 2/18/93 ND ND ND ND ND <br /> T-1 6/10/93 ND ND ND ND ND <br /> T-1 10/11/93 ND ND ND ND ND <br /> T-1 3/28/96 ND ND ND ND ND <br /> T-1 9/23/96 ND ND ND ND ND <br /> T-2 1/7/88 NA ND ND ND ND <br /> T-2 3/26/92 ND ND ND ND ND <br /> T-2 2/18/93 ND ND ND ND ND <br /> T-2 6/10/93 ND ND ND ND ND <br /> T-2 10/11/93 ND ND ND ND ND <br /> T-2 3/28/96 ND ND ND ND ND <br /> T-2 9/28/96 ND ND ND ND ND <br /> T-3 1/17/88 NA 00532 ND ND ND <br /> T-3 3/26/93 ND ND ND ND ND <br /> T-3 2/18/93 ND ND ND ND ND <br /> T-3 6/10/93 ND ND ND ND ND <br /> T-3 10/11/93 ND ND ND ND ND <br /> Tracy High Project No 4129 Page 2 <br />