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1 <br /> Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South El Dorado, Stockton, CA 11 <br /> groundwater The mass estimates for TPH in groundwater are summarized in the calculations in <br /> Appendix C <br />' <br /> 43 Analytical Summary <br /> The extent of TPH-G, TPH-D and BTEX in soil and groundwater at the site is summarized as follows <br /> • Approximately 31,134 pounds of TPH-G/TPH-D are adsorbed in the soil on site <br />' The majority of the mass of TPH-G/TPH-D are adsorbed to sod and are located in <br /> the sands approximately 40 to 50 feet below grade <br /> Approximately 335 pounds of TPH-G are dissolved in the groundwater at the site <br />' The migration of dissolved-phase BTEX and TPH-G follows the general direction of <br /> the groundwater gradient <br /> 5.0 PILOT TEST RESULTS <br /> Pilot tests were performed at the Manna Pro facility to assess the potential of various treatment <br />' technologies for mitigating the hydrocarbons in the subsurface The following sections discuss the <br /> procedures used and results obtained during evaluation of the remedial technologies <br /> 51 Aquifer Pumping Test <br />' An aquifer pumping test was conducted to meet the following objectives <br />' Quantify aquifer parameters, <br /> • Evaluate response of the aquifer to groundwater extraction conditions, and <br />' - Develop a model of the theoretical capture zone for extraction wells <br />' 511 Methodology <br /> Groundwater Technology conducted a 3-day aquifer pumping test on the shallow, semi-confined <br />' hydrogeologic unit to obtain hydrogeologic parameters of the water-bearing formation The aquifer <br />' zsysaoaa opo El <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />