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1 <br /> <br /> <br /> <br />1 <br />Aggregate Industries - F Street Site Characterization Report <br />Project Number 1001018 Pnxn~oN <br />October 9, 2001 <br />Page 8 <br />impacts to the property boundary, surficial soils, subsurface utilities, structures, registered <br />groundwater wells and nearby surface water bodies are described in the following sections of <br />this report. As described in Section 4.3 of this report, the groundwater flow appears to be to <br />the northeast at the site. <br />6.1 Property Boundary <br />' The downgradient property boundary is located approximately 600 feet northeast of the <br />release area. To date, concentrations of BTEX have not exceeded the MCLs in groundwater <br />' samples collected from the site, including the two (2) wells installed in the abatement <br />excavation. Therefore, potential impacts to the property boundary do not appear to be likely <br />at this time. <br />6.2 surficial Soils <br />' Impacted soils in the "smear" zone appear to be located approximately l1 to IS feet below <br />grade. The vertical and lateral extent of impacted soil appears to be bracketed based on soil <br />samples analyzed from the site. Future activities for the spill area include the mining of the <br />' gravel resources. Impacted soils encountered during future mining activities in the spill area <br />should be handled appropriately. <br />' 6.3 Subsurface Utilities <br />Subsurface utilities reportedly are not present in the impacted area with the exception of the <br />' electrical service for the AST. That electrical service is reportedly buried at a depth of <br />approximately two (2) feet below grade while groundwater is located approximately 5.6 to <br />' 7.3 feet below grade in the impacted area. Therefore, potential impacts to subsurface <br />utilities do not appear to be likely at this time. <br />' 6.4 Structures <br />Stnuctures are not present within the impacted area. Therefore, potential impacts to <br />structures do not appear to be likely at this time. <br />1 <br />6.5 Registered Groundwater Wells <br />' A list of registered wells within a '/:-mile radius of the subject site was obtained from the <br />Colorado Division of Water Resources. The registered wells are summarized in Table 4 in <br />Appendix B and their approximate locations are shown on Figure 7 in Appendix A. As seen <br />t from Table 4 and Figure 7, 25 registered wells are located within a %-mile radius of the site. <br />One (l) of the registered wells was listed three (3) times (Permit Number 3597F/3597FR). <br />1 <br />