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2.2 1997 Release <br />In approximately September of 1997, an incident similar to the 1998 incident occurred. The <br />chemicals, method of dumping, and location were the same as the 1998 incident. In this <br />incident, two drums of Repco Kill IIT"' weed killer were reportedly disposed of. As in the 1998 <br />incident, the affected road-base stockpile was screened using a vibratory classifier. <br />Additionally, a small portion of the affected minus'/, inch road base from the 1997 incident was <br />processed through the facility's wash plant. Products produced in the wash plant included <br />washed sand and washed'/. inch rock. The washed sand and washed rock were all sold as <br />masonry sand, landscaping rock, and other possible uses. None of these materials currently <br />remain on site. The fine, minus 200 mesh particles washed from the sand and rock in the wash <br />plant were settled in an asphalt-lined basin. This process water is continuously recycled <br />through two lined ponds connected in series (Figure 2). Most of the fine silts and clays settle <br />out in the first basin. <br />' In May of 1998, it was reported that the previous year's accumulated sediment was removed <br />from the first basin and stockpiled on site. Approximately 30 small truckloads of sediment were <br />removed and placed in a pile at the base of the pit high wall. This pile was then pushed up the <br />side of the high wall with afront-end loader. <br />2.3 Summary <br />Based on the foregoing reported release scenarios and MSDS provided by B&B, the following <br />chemicals have the potential to have been released: <br />• 2,4-D weed killer <br />• Bromacil weed killer <br />• Diesel fuel <br />• Dilute water and antifreeze solution. <br />As illustrated in Figures 3, a total of nine media were potentially affected by these releases: <br />• Minus'/.Inch Road Base Stockpile <br />• Remaining minus'/~ Inch Road Base Stockpile <br />• Subsurface Soils Under the Original Minus'/, Inch Road Base Stockpile <br />• Hot Plant Bag House Dust <br />• Asphalt <br />• Wash Plant Sediment <br />• '/. Inch Rock <br />• '/. Inch Road Base <br />• Washed Sand and Rock <br />I B8B Excavating, Inc., Edwards, Colorado December 17, 1998 <br />Montgomery Pit Facility 39210-003-034 <br />Draft Sampling and Analysis Plan 8 DAMES 8 MOORE <br />