2007-08-10_REVISION - M2001107 (4)

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08/03/2004 14:13 9704542847 ROLL.IN PAC= 03 Gravel C-valuation NorthwKt of Wald County Roada 78 and 25 Wald County, Colorado Tarracon ProJact No. 210351 t7 Terracon field observations of the auger cuttings. Lenses of larger particle sizes may be encountered which were not observed in the samples obtained. In order to use this material for typical construction materials such as base course, conae~, and asphalt aggregate, extensive screening may be required. This may generate large amounts of reJect sand material. The matenai may be used without processing for strucfura! fill and subbase material. Yo more accurately evaluate the qualify of the granular matelot as well as the size of the particles, test pits should be tlu9 at the ske and detailed laboratory tests should be performed. Since the sand and gravel is below groundwater, dewatedng of the pit will be required to excavate the sand and gravel, or a drag line will be needed to remove the overbuMen end aggregate, GENERAL COMMENTS The analysts and recommendations presented in fhb latter are supplemental and are based upon the data obtained from the borings performed by Terracon at the indicated bcatlons_ Thls letter does not reflect variatons, whidt may occur between borings or across the site. The nature and extent of suds variations may not become evident until mining operations are performed. These valetions may attest the quantity and or the quality of the materials encountered. The scope of services for this project does not Include either specifically or by Implication any environmental assessment of the ske or identification of contaminated or hazardous materials or mnditions. If the owner Is concerned about the potential for such contamination, other studies should be undertaken. This fetter has been prepared for the exclusive use of our client for specific appiiption to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranties, either express or implied, era intended or made. In the event that changes in the nature, design, or location of the project as outlined In this report, are planned, the conclusions and recommendations contained in this report shalt not be considered valid unless Terracon reviews the changes, and either verfies or modifies the conclusions of this report in writing. if you have any questions regarding this letter, or I} you require further infortnatlon, please do not hesitate to contact us at (97D) 351-0460. _,,,,,,,,,._ Sincerely, TER~RA'C~ON/`~~CONSUL~TANTS, Inc. An rem d i Bedoya, E.I. ` Staff Engineer Ty G. Alexander, Office Manager ~~yp0 REC/ST nee~n Copies to: Addressee (3)