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1 <br />' Aggregate Industries - F Street Site Characterization Report <br />Project Number IOOI018 PnRncoN <br />' October 9, 2001 <br />Page 3 <br />below. Thirteen (13) soil samples were collected during the abatement process. The soil <br />t sample results were discussed in the July 6, 2001 Soil and Groundwater Abatement Report. <br />' Approximately 83,000 gallons of groundwater/free-phase product mixture was pumped from <br />the abatement excavation for temporary storage on site. The liquid was transported by Key <br />Energy Services to Arvada Treatment Center (ATC) for treatment and disposal. ATC <br />reported that approximately 450 gallons of free-phase product was recovered from the liquid <br />shipments and transported to Mesa Oil for recycling. An additional 20,000 gallons of <br />groundwater was pumped from the excavation and that water was used for dust suppression <br />' in the asphalt plant. <br />' Two (2) groundwater samples were collected during the abatement process. One (1) <br />groundwater sample was collected from the abatement excavation to document the <br />concentrations of petroleum hydrocarbons which were present in the groundwater in the <br />' abatement excavation while one (1) groundwater sample was collected from a downgradient <br />mining dewatering trench to confirm that the dewatering trench had not been significantly <br />impacted by petroleum hydrocarbons. The north dewatering trench is located approximately <br />' 650 feet northeast of the abatement excavation. The groundwater sample results were <br />discussed in the July 6, 2001 Soil and Groundwater Abatement Report. <br />' 3. SUBSURFACE EXPLORATION <br />' Information regarding the subsurface exploration performed at the site in July 2001 is <br />presented in this chapter. The number, locations and depths of soil borings and monitoring <br />' wells completed at the site are discussed in the following sections. Subsurface conditions <br />encountered at the site are discussed in Chapter 4 of this report while analytical results for <br />soil and groundwater samples collected from the site are discussed in Chapter 5 of this <br />' report. Field methods are discussed in more detail in Appendix C. <br />' 3.1 Soil Borings <br />Four (4) soil borings were completed at the site on July 9 and July 10, 2001 to obtain <br />information regarding subsurface soil conditions. The approximate locations of those <br />' borings, i.e. MW-1 through MW-4, are shown on Figure 3 in Appendix A. A Paragon field <br />engineer was on site during the drilling operations to log the borings, collect soil samples <br />' and document the field activities. Please refer to Appendix C for further details regarding <br />the field methods employed at this site. <br /> <br /> <br />1 <br />