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BMG Resources <br />Soil Sampling at the Historic Fueling Area <br />' Project No. 46027059 <br />October 22, 2002 <br />~ 3.0 LIMITED SOIL SAMPLING <br />Terracon <br />The purpose of the soil sampling scope of work was to determine petroleum hydrocarbon <br />concentrations in soil in the historic fueling area. Terracon excavated two test pits at the <br />site to collect soil samples for analytical testing. Craig Pruett, Senior Project Manager for <br />Terracon, performed the onsite observations and soil sampling activities. Terracon <br />performed the site field activities on August 29, 2002. <br />3.1 Field Sampling Activities <br />A backhoe-loader, operated by Keith Blewett of Environmental Resources Group of <br />Commerce City, Colorado, was used to excavate two test pits approximately six feet to the <br />topographically downgradient side of the electrical conduit assumed to be associated with <br />the historic fuel pumps. The locations of the excavations are depicted in the Site Diagram, <br />Figure 1 of Appendix A. Photographs documenting the test pit excavation activities are <br />presented in Appendix C. <br />The test pits were advanced to depths approximately six inches below the liner. Soil was <br />' removed from the excavation in approximate six-inch lifts. Terracon noted the general <br />characteristics of the soil and made note of anomalous soil staining or odors. <br />Terracon used hand tools to expose undisturbed soil on the south wall of each excavation. <br />Three samples were taken from Excavation 1 and Excavation 2 representing soil conditions <br />at 4 inches to 12 inches below ground surface (bgs), 24 inches to 30 inches bgs (the six- <br />inch layer of soil directly above the liner) and 30 inches to 36 inches bgs (the six-inch layer <br />of soil below the liner). <br />3.2 Site Observations <br />Terracon's site reconnaissance revealed that all ASTs and ancillary equipment associated <br />with petroleum hydrocarbon storage and dispensing at the site had been removed prior to <br />Terracon's initiation of project activities. Two electrical conduits were observed in the <br />central portion of the site. Terracon assumes the electrical connections were associated <br />with the historic fueling pumps. Surficial evidence of environmental impact to the site or the <br />immediately surrounding area was not observed. Terracon observed indications of livestock <br />activity within the bermed site boundary. <br />3.2.1 Southern Test Excavation No. 1 Observations <br />Test Excavation No. 1 observations were recorded during August 29 field activities. Test <br />Excavation No. 1 was located approximately six feet to the north of the southern electrical <br />connection. Terracon encountered fill material at all depths. Fill material consisted of a clay <br />and gravel mixture in the upper 12 inches followed by a sandy fill material. The sandy fill <br />extended to at least six inches below the liner (located at approximately 30 inches bgs). <br />2 <br />