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water flow for the Pestana Trust property across the street • at 275 Grant Line Road have historically been very similar to those for 2360 East Street , we request that the N-300 -E direction of flow and hydraulic gradient of 0 0025 ft/ ft calculated for 275 Grant Line on September 30 , 1994 be accepted for 2360 East Street until the wellheads at the East street site can be re-surveyed i Table 4 Wel ! iead Elevations , Depths of Groundwater , and Groundwater Elevations at 2360 East Street , Tracy August 31 , 1994 Well Wellhead Depth to Groundwater Number Elevation Groundwater Elevation ---- ------- -- ------------ ------------------------------ MW-1 69 73 ft 7 50 ft 62 23 ft MW-2 69 68 ft 6 22 ft 63 46 ft MW-3 69 65 ft 6 82 ft 62 83 ft ------------------------------------------------------- Further Definition of the Eastern Plume Boundary On July 22 , 1994 , Dr Ozdemir Beyce of EPM oversaw the auguering of three ( 3 ) additional soil borings (designated EP-5 , EP-6 , and EP-7 ) advanced by Del Tech Geotechnical SuppoLt Services beyond the eastern property boundary of the sub]ect site in response to the request for additional investigation in this area made by Mr Michael Infurna Each boring was advanced with a hand auger Discrete soil samples and a grab water sample were acquired from each borehole Each soil sample was collected within a 1 9 inch diameter by 4 0 inch long clean brass sleeve fitted within a t-?L .Lve sampler lowered into the borehole to a point access,-d by the hand auger Upon being retrieved , the drive sampler was opened and the brass sleeve removed The ends of each sleeve were then covered with teflon sheetirc/aluminum foil , fitted with plastic caps , and seal �d witl-, duct tate Each tube was then marked and placed i_z an iced , insulated container for trans-portation -o Prioiizj Environmental Labs of Milpitas , a California- state certified hazardous waste analytical laboratory , ,-,r_der �-ha_r- of custody Subsequent analyses were performed for Total Petroleum Hydrocarbons as Diesel (TPH-D) , Total Petroleum Hydrocarbons as Gasoline (TPH-G) , benzene , . toluene , ethylbenzene , and total xylenes (BTEX) using EPA Page 8