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r� 06 Febi uary 2004 AGE-NC Project No 01-0865 Page 5 of 9 1 8 Ground Water Analysis Fuel additives(EPA Method 8260),BTEX(EPA Method 8020 or 8260B)and TPH-g(EPA Method 8015M)have been sampled at the site in quarterly ground water monitoring events and grab ground water samples collected from soil borings, the results have been submitted to the RWQCB in quarterly reports A grab sample from EW-1 was collected on 30 January 2004 and submitted to a DHS-certified laboratory for analysis of lead,chlorinated pesticides and general minerals Copies of the laboratory reports are included in Appendix B 2.0 SITE HYDROGEOLOGY In accordance with Section B of Attachment A from General Order 5-00-119, AGE has evaluated the following mentioned site hydrogeologic characteristics 21 Depth To Ground Water Based on twenty-six ground water monitoring events recorded at the HHM site between September 1997 and December 2003, depth to ground water measurements have fluctuated between 4 72 feet and 22 85 feet bsg on the levee and between 1 00 foot above surface grade (winter drowning) and 8 77 feet bsg on the adjacent plain (flat land) to the east 22 Ground Water Flow Direction And Gradient Based on twenty-six ground water monitoring events recorded at the HHM.site between September 1997 and December 2003, ground water flow eastward from the levee towards the adjacent plain at gradients of approximately 0 25 ft/ft On the plain,the ground water flow rotates to a more southeast to south-southeast direction and the gradient decreases to between approximately 0 085 ft/ft at the northern part and 0 027 ft/ft at the southern part of the plain 23 Vertical And Lateral Extent Of Pollution The vertical and lateral extent of petroleum hydrocarbon-impacted ground water is Inferred based on analytical results of grab groundwater samples collected from thirty-nine direct-push soil borings, fourteen ground water monitoring wells and one ground water extraction well (Figure 2) Discrete grab ground water samples were collected at first water from direct-push soil borings and shallow- Advanced GeoEnvironmental,Inc