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1 <br /> Working To Restore Nature <br /> Excavated soils were stockpiled onsite and aerated under the authorization of the San Joaquin <br /> County Air Pollution Control District (APCD) Aerated soils were confirmed clean through <br /> laboratory analyses and subsequently backfilled into the excavation under the authorization of <br /> the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> �.2 Groundwater Pumping Test <br /> ' A pumping test was performed on the shallow aquifer beneath the site on December 16 and 17, <br /> 1993. The objective of testing was to assess the hydrologic parameters at the site as an aid in <br /> the evaluation of possible remedial options <br /> rThe testing program consisted of three separate elements designed to provide complimentary <br /> information. The first element consisted of static groundwater monitoring to establish initial <br /> conditions and to help in the evaluation of water level changes observed during pumping. The <br /> second element of the test program consisted of a step-drawdown test of well MW-4, designed <br /> to provide data on well efficiency and to select an appropriate pumping rate for the longer term <br /> tests. The third element of the program consisted of conducting a constant rate pumping test on <br /> well MW-4 to estimate aquifer transmissivity. <br /> ' The pumping well was outfitted with a 2-inch submersible pump which was plumbed through <br /> a gate valve and flowmeter The flowmeter calibration was verified by manual flow <br /> measurement. The discharge rate was controlled and recorded manually. Extracted water was <br /> 1 pumped into the sanitary sewer in accordance with a temporary discharge permit issued by the <br /> City of Stockton. Drawdown in the pumping well and in peripheral observation wells was <br /> ' measured using a Sol nst water level probe and recorded manually. Pumping test logs are <br /> included in Appendix H. <br /> 5.2.1 <br /> Static Water Levels <br /> ' Static water levels in monitoring wells MW-1 through MW-8 were measured on December 16 <br /> and 17, 1993 prior to initiating the pumping tests <br /> I5003SUMPORMCAP-0794 DRF 5 <br />