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frontage of the lot. There is one residence, garage, a barn and outbuildings on the parcel. Figure 2 shows the former UST area, buildings, monitoring wells, calculated gradient for April 1999, with streets in proximity to the parcel. 4. WELL SURVEY Potable water is furnished by the Pescadora water District to the homes and farms on Tom Paine Road within 2, 000 feet of the subject site. One recorded well exists at 18777 S Tom Paine Road and is marked on Figure 3 . The information concerning that well is included as Appendix B. The Monitoring wells on the subject site are indicated in Figure 4 . 5 . HISTORIC GROUNDWATER LEVELS No groundwater samples were collected when the UST removal, as there was no groundwater in the excavation in August 1991 . WM. J. HUNTER & ASSOCIATES (HUNTER) completed both a soil and groundwater sampling event in November 1991 and again in January 1992 . HUNTER estimated the groundwater table to be approximately 6 to 12 feet below ground surface. The results of the quarterly depth to groundwater measurements by JPCA are noted in Table 1. The top of the well casing is approximately 2 feet above ground surface . Table 1 shows, by quarter, t1fe calculated Gradient in direction and ft/ft. The groundwater depth from the ground surface varies from approximately five to ten feet. The variation is believed to be caused by seasonal rains and irrigation. The gradient variation is most likely caused by irrigation. A. Gradient Calculation Prior to purging the wells and collecting groundwater samples, the depth to groundwater was measured on April 13, 1999 . Field notes are contained in Appendix C. The depth to groundwater was measured in the three wells, by an electronic probe, from the mark located on the top of each casing. The results of the data collected on April 13, 1999 are contained in Table 2 . The calculated gradient historically is generally SSE at 0 . 012 ft/ft. 3