2007-11-20_REVISION - M1982015 (12)

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The slurry wall was completed around the pipeline but slurry wall construction was temporarily discontinued to the east and west of the pipeline break. GeoCon collected a sample of the slurry on October 29, to determine disposal options. The sample contained very high levels of benzene, toluene, ethyl benzene and total xylenes (BTEX) and total volatile petroleum hydrocarbons (TVPH). The laboratory results of the slurry testing are summarized in Table 2. On December 13, 2006, the CDPHE issued a spill response letter and submit a Corrective Action Plan pursuant to Section 100.26 of the Colorado Hazardous Waste Regulations. On December 18, 2006, E-21 was contracted by GeoCon to initiate site characterization activities. - A map to scale showing the depth to groundwater across the site, direction and rate of groundwater movement across the site using a minimum of three measuring points. See Figure 4. - A discussion of all hydraulic tests performed at the site to characterize the hydrogeologic properties of any aquifers onsite and in the area. Aquifer testing has not been completed. This will be performed and submitted to CDPHE as an addendum to this report. - All reports and/or correspondence which detail site soil, groundwater and/or surface water conditions at the site, including analytical laboratory reports for all samples and analyses. Details of site soil, groundwater and surface water conditions are included below. ' - A discussion of how all environmental samples were collected, including rationale involved in sampling locations, parameters, and methodology, a description of sampling locations, sampling methodology and analytical methodology, and information on well construction details and lithologic logs. All sample analyses performed and presented as part of the environmental assessment should be appropriate and sufficient to fully ' characterize all constituents which may have impacted soil, air surface water and/or groundwater on the property. The applicant should use EPA approved analytical methods when characterizing the soil, air, surface water and/or groundwater. 1 Baseline Evaluation of Soils. Groundwater and Surface Water On December 18, 2006, surface water grab samples were collected from the St. Vrain River and adjacent quarry ponds to determine if petroleum hydrocarbons may have impacted nearby surface water bodies. The samples were collected using a new disposable PVC bailer and nylon string. The samples were placed 8