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1 <br /> �1 <br /> SITE HISTORY AND PREVIOUS WORK f <br /> Previous Site Investigations <br /> Previous work at the Site has been performed under the regulatory oversight of the PHS/EHD <br /> and the RWQCB and is briefly outlined below: <br /> ♦ Removal of underground storage tanks by TVG in 1987. <br /> r ♦ Installation of six monitoring wells in three phases. <br /> • Monitoring wells MW-1, MW-2, and MW-3 (Exceltech, 1987). <br /> 4. . Monitoring well MW-4 (Exceltech, 1988). <br /> Monitoring wells MW-5 and MW-6 (WaterWork, 1989). <br /> ♦ Quarterly monitoring activities from third quarter of 1989 through second quarter of 1994 <br /> (various reports by WaterWork and RESNA, 1989 to 1994). <br /> ♦ Groundwater pump and treat system second quarter of 1991 through second quarter of <br /> 1994 various reports b WaterWork and RESNA, 1991 to 1994). <br /> r ( P Y . <br /> ♦ Soil and groundwater investigation; in two phases, 1994 and 1995 (RAH Environmental <br /> 1995a &b). <br /> r <br /> • Soil borings SB-1 to SB-7: soil and groundwater sampling. <br /> • Hand augered borings HAI to HA3 within the forklift shop: soil and groundwater <br />'r sampling. V <br /> ♦ Additional soil and groundwater investigation 1996 (Draft SECOR report). <br /> Soil borings SB-8 to SB-10:,soil and groundwater sampling. <br />' ♦ HLA review SECOR work and recomends additional investigation(HLA, August 1997) <br /> ♦ HLA samples monitoring wells and submits results to PHS/EHD (HLA, September,. 1997 <br /> The locations of the monitoring wells and soil borings, the approximate location and <br /> dimensions of the former USTs and the excavation; the forklift shop ands other relevant <br /> features are shown on Plate 3. <br /> y <br /> • 1 3 <br /> F <br /> f <br />