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ai ~~~ <br />November 30, 2001 <br />Page 2 of 2 Pages <br />Remedial measures consist of additional samples to determine the extent of the suspect material <br />(PAP, Exhibit 6, Item #4, Colowyo letter of January 4, 1983). If the azeal extent is greater than <br />one acre, it was once to be covered with at least five feet of acceptable material. This <br />requirement was reduces to 18 inches of topsoil cover (PAP, Exhibit 6, Item #4, Division letter <br />of January 24, 1983). <br />Such elevated SAR readings in overburden prepared for receipt of topsoil aze unusual at <br />Colowyo. Please review operations to assure that materials from AZ and A3 horizons are being <br />placed at minimum depths of 100 feet of cover (PAP, Exhibit 6, Item #4, Colowyo letter of <br />August 11, 1983), and that the more desirable, weathered, overburden materials (Upper X and <br />Lower X materials)(PAP, Exhibit 6, Item #4, Colowyo letter of February 26, 1990) are being <br />used at final regraded surfaces over other overburden materials. <br />Please call me if you have any questions. <br />Yours truly, <br />w~~ <br />$yrofi G: Walker <br />' r' ` ~ Ehvironmental Protection Specialist - <br />1 Enclosure, as stated <br />Files: C=81=019, General~Coirespondence' - <br />C:\WPDOCS\Colowyo\Special topics le[ier.doc <br />_ ~ ., _ .. <br />