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l 1 <br /> ��ZMA <br /> Working To Restore Nature <br /> locations are shown on Figure 2. Soil samples collected during drilling activities were analyzed <br /> k'= <br /> for the presence of benzene, toluene, ethylbenzene, and xylenes (BTEX) and TPHd. Field <br /> observations and laboratory analyses of soil samples collected from the borings. (Table 1) <br /> fI. I <br /> indicated that soil had been impacted by the release of petroleum hydrocarbons to the subsurface. <br /> TPHd was detected in all borings with the exception of MW-1, at depths varying from 10 to 15 <br /> feet below grade. Groundwater was initially encountered at approximately 11.5 feet below <br /> grade. Hydrocarbon constituents were detected in groundwater samples from monitoring wells <br /> MW-3 and MW-4 subsequent to development (Table 2). <br /> A more detailed description of work performed prior to 1991 is included in WaterWork <br /> r=.- <br /> Corp./RESNA Industries Inc. (RESNA) December 5, 1990 "Preliminary Report - Assessment <br /> of Potential Soil and Groundwater Contamination". <br /> In February 1992, the 5,000-gallon ulg diesel tank was removed from the site by Falcon Energy j <br /> Associates. RESNA was present in an advisory capacity. A soil sample collected from beneath <br /> the center of the tank indicated 340 ppm diesel contamination was present at 18 feet below <br /> ground surface. Free petroleum product was noted floating on groundwater within the <br /> r r <br /> excavation. A summary of the tank removal and sampling is included in RESNA's March 24, <br /> r: <br /> 1992 "Underground Storage Tank Removal-Sail Sampling Report". <br /> .r <br /> _ During the first quarter of 1992, RESNA was retained by the City to conduct quarterly <br /> I <br /> groundwater monitoring and sampling of the site monitoring wells (MW-1 through MW-4). <br /> Historical groundwater monitoring data are summarized in Table 3. RESNA has periodically <br /> bailed floating free product from well MW-4. Free product is stored on-site in DOT approved <br /> drums pending appropriate disposal. A summary of free product removal is presented in Table <br /> " 4. <br /> f In December 1992, PHS/EHD requested additional definition of the lateral extent of soil and <br /> t` groundwater contamination. In August 1993, RESNA drilled and sampled 10 soil borings (SB-3 <br /> :3 through SB-10, MW-5 and MW-6) to approximately 15-20 feet below grade (Figure 2). Borings <br /> MW-5 and MW-6 were advanced an additional 15 feet and converted to groundwater monitoring <br /> wells. Discrete groundwater samples were collected from soil borings SB-3, SB-7, SB-8 and <br /> r : SB-9 using Hydropunch technology. A summary of sample collection methodology and results <br /> fir; F <br /> W0365%REPORTSWAM94.FNL 2 <br /> r <br /> f-- <br /> r <br />