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:r <br /> 7.0 CONCLUSIONS,i <br /> F <br /> LThe results of this assessment indicates that fuel petroleum hydrocarbons are present in the <br />'4 groundwater as a result of gasoline dispensing activities.�from possible onsite or offsite <br /> locations. The TPH and BTEX constituents were detected:in monitoring well MW-2 which <br /> 14 <br /> is situated at the location of a possible former UST. <br /> Based on the presence of gasoline constituents detected in groundwater beneath the facility, <br /> SECOR recommends that ARCO should consider an additional subsurface investigation <br /> onsite to assess the extent, probable sources, and potentiat.impact of soil and groundwater <br /> contamination. <br /> E� <br /> Specifically, groundwater monitoring at the site should be continued and all the wells <br /> sampled for TPH, BTEX, MTBE and given the inconsistencies in sample results, volatile <br /> organics by method 8260 should also be included for all the wells. <br /> �i <br /> Additional subsurface investigation should be considered, including the drilling of five <br /> additional soil borings in the vicinity of MW-2 and hydropunch groundwater sampling in the <br /> borings,in order to evaluate potential environmental liability' from possible onsite and offsite <br /> . sources. Depending on the results, additional groundwater monitoring wells may be <br /> necessary. The proposed soil boring/hydropunch locations pare shown on Figure 3. <br /> 3 <br /> :i <br /> f <br /> Ei# <br /> I� <br /> 1 <br /> i <br /> 'i <br /> EF <br /> 'I <br /> I� <br /> 7N 40007-097-01 <br /> dec-96\arcmteca.esx 7-1 ; <br /> ,11}hh <br />