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1 <br />. uir;? a C. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />FOUNDER <br />ARVADA, COLORADO 80003 <br />303-423-7297 <br />FAX 303-423-7599 <br />June 2, 2008 <br />Mr. David A. Bird <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Suite 215 <br />. <br />Denver, CO RECENED <br />? 0 3 2003 <br />Dear David; <br />pidisioei o Beclamation, <br />Mining and Safety <br />RE: Albert Frei and Sons,-Inc. <br />Priola Pit -..M-20.07-087' <br />kA16equacy Review 0;2 <br />On behalf of my client Albert-Frei and Sons, Inc., I will <br />respond to your adequacy review in the order presented. We have <br />continued the decision date to July 10,.2008 per our discussion <br />for time to resolve some.of the items in your letter. <br />Rule 3.1.6 Water - General Requirements <br />1) Thank you for the; clarification. <br />2) According to the !GROUND WATER ATLAS OF-COLORADO' the Hydraulic <br />Conductivity for ;the South Platte River is 100-2,000 ft/day. <br />The PHYSICAL SOIL PROPERTIES for this site listed in Exhibit I-J <br />Page 37, lists the Saturated Hydraulic Conductivity for-the <br />soils.-on site as being between 42-141 10-6 m/s or 12 'to 40 <br />feet per day. This is for the soils only and does not <br />reflect the underlying gravel strata. The material Frei <br />plans to use is a.,Imixture of crusher fines, and dirt mixed. <br />with minor amount's of aged concrete fragments that could be <br />classified as Silty Sand having a hydraulic conductivity of <br />0.1 to 10 feet per dayz. <br />The ground water 'on the east side of the South Platte River <br />flows from SE to NW until it approached the river where it <br />flows parallel to'!the river. Tho'rnton's slurry wall liner, <br />has blocked all ground water flows from reaching the river <br />in this area,so water mounds along the up gradient side of <br />their liner: This is evident.from water in the landowners <br />basement that Thornton has had to deal with. The fill we, <br />'Ground Water Atlas of Colorado- Chapter 5.1 - South Platte River Basin Page 43 <br />ZGround Water Atlas of Colorado- Chapter 2 - Ground Water - chart Page 17,