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~] <br />4.0 FIELD ACTIVITIES <br />Field activities were conducted on Mazch 26, 1999 by TechLink staff with the supervision of Greg <br />Lewicki and Allen C. Sorenson, representative of the Colorado Division of Minerals and Geology. <br />Two azeas were tested for potential soil contamination: the original release azea ('/,-inch Road Base) <br />located east of the Screen Plant and the'/,-inch rock pile located northeast of the Concrete Batch <br />Plant as shown in Figure 1. Also, groundwater in the vicinity of the original release azea and the <br />Eagle River were tested for potential contamination from the Repco Kill II weed killer chemical <br />' release. <br />4.1 Safety <br />' Prior to the start of field activities, a site specific Health and Safety plan following the occupational <br />' Safety and Health Administration (OSHA) Regulations was reviewed for the Montgomery Pit site. <br />Field personnel also complied with site-specific health and safety protocols including appropriate <br />protective clothing, vehicle and safe work permits. Also, prior to commencing field activities, B & <br />' B Excavating personnel cleazed and prepazed the areas for sampling. <br />' 4.2 Drilling Program <br />4.2.1 Hand Augers <br />' The'/,-inch rock pile was first screened with PID readings to locate the azeas of the highest possible <br />contamination. PID readings were conducted in surface and subsurface soils all azound the pile and <br />' in central azeas. Nineteen hand augers with vaziable depths were completed in the'/,-inch rock pile <br />as shown in Figure 2. The maximum hand auger depth was 12 feet measured from the top of the rock <br />pile. Hand augers were drilled vertically and at a 45-degree angle towazd the center of the pile. The <br />' general location of the 3/4" Rock Pile is shown in Figure 1. <br />PID readings ranged from 0 to 3.4 ppm. From this preliminary screening, soil sample locations and <br />' depths were chosen with the approval of all parties present. Five soil samples were collected from <br />the'/.-inch pile and their locations along with depths are shown in Figure 3. <br />' Three hand augers were completed and subsoil samples were collected from the former release <br />location azea (3/4" Road Base pile), on the northwest side of the site. These samples were collected <br />' to verify if any weed killer migration has occurred into subsurface soils. These samples were <br />identified as Ssubsoil South, Ssubsoil NW, and Ssubsoil NE. Sample locations aze shown in <br />Figure 3. <br />1 <br />1 <br />~nvlrorunenla1511e Invesllgallon <br />' Tecttl.ink Environmental, Inc. <br />Montgomery Pit <br />B&B Excavating <br /> <br />