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. CONCLUSIONS <br /> The soil sample obtained from the fill pipe end of the excavation of tank T-3 contains <br /> concentrations of greater than 100 ppm. According to the State of California Water <br /> Resource Control Board, local groundwater is approximately 60 feet below ground surface <br /> The depth to groundwater at the site is approximately 58 feet (Lawrence Pereirra, former <br /> owner, personal communication) <br /> The State of California Water Resource Control Board's Leaking Underground Fuel Tank <br /> (LUFT) Manual provides a method for analysis of the leaching potential for gasoline and <br /> diesel This method considers various factors which contribute to leaching potential, and <br /> which, therefore, can present a threat to groundwater In addition, an estimate can be <br /> made regarding the allowable concentrations of TPH and BTXE to remain in place <br /> without threatening groundwater Using the LUFT Manual, allowable concentrations that <br /> ` . can remain in the soils at the Homestead Land site are 1,000 ppm TPH-D and <br /> 0 3/0 3/1/1 ppm B/T/X/E, respectively <br /> Page 10 <br />