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HYDRO <br /> ENVINMENTAL <br /> TEAlN ES,INC. <br /> has been deposited in the extreme northwestern corner of the pita This pile has a : <br /> heavier vegetation. growth. It was not possible. to determine what lay beneath <br /> the surface of either pile. No soil samples were collected for.laboratory analysis. <br /> • An area of poured tar was observed in the west-central portion of the pit, along a <br /> faint dirt track. An area of apparent dry wall with limited amounts of roofing <br /> material was observed in the eastern portion of the pit. <br /> • Concrete debris has been poured down the sides'of the northern. and extreme <br /> eastern walls of the pit. <br /> • Surface water drains down the eastern, western and southern walls of the pit, <br /> through the piles of debris, and percolates down through the sandy soil in. the <br /> center of the pit. No petroleum sheen was observed on water ponded in the <br /> bottom of the pit. No water samples were collected for analysis. <br /> • Several tires and a smashed refrigerator were present in the central portion of <br /> the pit. <br /> + A small trench has been excavated along the base of the south-central wall of the <br /> pit. <br /> {.a <br /> 3.0 SUBSURFACE INVESTIGATION METHODOLOGIES <br /> 3.1 Borehole Drilling and Soil Sampling <br /> F <br /> All drilling and soil sampling was .perform_ ed according to standard HETI protocol <br /> consistent with Central Valley Regional Water Quality Control Board (RWQCB) <br /> recommended guidelines and procedures. A copy of the HETI protocol is included <br /> in Appendix A. <br /> Soil borings and monitoring well locations were chosen based on the results of the <br /> field assessment. Five locations were selected . for soil sampling and well <br /> installation. ` <br /> L.� <br /> 3 <br /> i <br />