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1 <br /> <br />t <br />1 <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br />Ms. Connie Davis/Aggregate Industries - F Street Soil and Groundwater Abatement Report <br />Project Number 1001018 PAR~IGON <br />July 6, 2001 <br />Page <br />Based on information provided by Aggregate Industries, the volume of the diesel-fuel spill <br />was estimated to be approximately 10,8=40 gallons and reportedly occurred over a relatively <br />short period of time from mid-March to the end of April 2001. Upon excavation of the <br />underground piping, it was discovered that the leak appeared to have occurred from a faulty <br />pipe fitting on the south side of the .4ST basin. Test pits were completed at the site on iVlay <br />8, 2001 as a preliminary evaluation of the extent of contamination in preparation for <br />abatement of the diesel-fuel spill. <br />The spill area is located on the west side of the subject site. Future activities for the spill <br />area include the mining of the gravel resources. The long-term planned usage for the site is <br />an open pond at the spill area with residential development west and east of the spill area in <br />accordance with the Reclamation and Use by Special Review permits issued by the Colorado <br />Division of Minerals and Geology and Weld County, respectively. <br />2. SOIL ABATEII~IENT ACTIVITIES <br />Soil abatement activities consisting of the excavation and re-use of contaminated soil in <br />asphalt mix was performed at the site by Aggregate Industries personnel between May 8 and <br />Ivlay 31, 2001. Approximately ?,000 cubic yards of contaminated soil was excavated from <br />the spill area and stockpiled at the site for use in asphalt paving mix. The excavated <br />material was processed on site using the crusher to segregate the coarse rocks from the tine <br />materials. <br />' The approximate extent of the abatement excavation which was completed at the site is <br />shown on Figure 3 in Appendix A. The resultant abatement excavation was completed to a <br />depth of approximately 13 to 15 feet below grade. Groundwater was encountered during the <br />' abattement activities at depths of approximately i l to 12 feet below grade. Water and free- <br />phase product were pumped tram the abatement excavation for off-site disposal as described <br />in Chapter 3 of this report. <br />1 <br />1 <br />1 <br />1 <br /> <br />Thirteen (13) soil samples were collected during the abatement process. Eleven (Il) soil <br />samples were collected for assessment purposes to document the concentrations of <br />petroleum hydrocarbons which were present near the edges and bottom of the abatement <br />excavation while two (2) soil samples were collected to document the concentrations of <br />petroleum hydrocarbons in soils excavated from the site. The soil samples were transported <br />under standard Paragon chain-of-custody procedures to Technology Laboratory. Inc. (TLI) <br />for benzene-toluene-ethylbenzene-xylenes (BTEX) and total extractable petroleum <br />ltvcirocarbons (TEPH) analyses. Tluee (3) of the soil samples were also analyzed for <br />polvnuclear aromatic hydrocarbons (PAHs). The soil sample results are discussed in Section <br />4.1 of this report. <br />1 <br />