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<br />Ms. Connie Davis/Aggregate Industries - P Street April 2002 QMR/Closure Requesf <br />Project Number 1001018 PnRnGON <br />May 1, 2002 <br />Page 6 <br />4. BTEX and TEPH concentrations were not observed above the laboratory detection limits <br />or were observed at relatively low concentrations in the groundwater samples collected <br />from wells MW-1 through MW-5 and EW-1 on Apri14, 2002. <br />5. BTEX concentrations observed in the groundwater samples collected from the site during <br />April 2002 did not exceed the MCLs. The April 2002 sampling episode was the fourth <br />event in which BTEX concentrations observed in groundwater samples collected from <br />the site did not exceed the MCLs. <br />The following recommendations are made based on information obtained during the <br />quarterly sampling activities. <br />1. It is our opinion that additional monitoring, assessment or abatement is not warranted at <br />the site at this time and site closure should be granted by the Colorado Division of <br />Minerals and Geology for the 2001 diesel-fuel release. <br />2. Impacted soils which may be encountered during future mining activities in the spill area <br />should be handled appropriately. <br />5. GENERAL COMMENTS <br />The analyses and opinions expressed in this report aze based on data obtained from the <br />groundwater monitoring wells installed at the indicated locations along with other <br />information described in this report. This report does not reflect any variations in <br />subsurface geohydrology or contaminant distribution which may occur between wells and or <br />across the site. Actual subsurface conditions may vary and may not become evident without <br />further exploration. Due to the dynamic nature of groundwater flow and contaminant <br />migration, subsurface conditions will vary with time. <br />This report was prepared for the exclusive use of Aggregate Industries for specific <br />application to the subject property and has been prepared in accordance with generally <br />accepted geo-environmental engineering practices. No warranties, either express or implied, <br />are intended or made. In the event that changes in the nature or location of suspected <br />sources of contamination as outlined in this report are observed, the conclusions and <br />recommendations contained in this report shall not be valid unless these changes are <br />reviewed and the opinions of this report are modified and verified in writing by Paragon. <br />