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• • <br />• <br /> containers leaving no headspace. The sample container was then immediately <br /> capped and placed in a chilled ice chest for shipment to Priority Environmental <br /> Laboratory in Milpitas, California (a State Certified Testing Lab) under chain-of- <br /> custody documentation <br /> Groundwater Contour Map and Flow Gradient <br /> Groundwater contour map was prepared for the data lasted in Table 1 above (see <br /> Figure 1). Groundwater elevation contours were plotted to a known datum from the <br /> measurements The groundwater flow direction was to the north under a calculated <br /> 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 the Laboratory Analysis Results can <br /> be found in Appendix B. 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 Ethylbenzene Xylene <br /> No. Sampled ----------------------------- ug/1 ------------------------------ <br /> T-1 1/7/88 NA 0.0907 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-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-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 /> T-3 3/28/96 ND ND ND ND ND <br /> BLANK 3/28/96 ND ND ND ND ND <br /> • Tracy High Protect No. 4I29 Page 2 <br />