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• <br />• <br />J U D I T H L H A M I L T O N <br />Consulting Geologist and Engineer <br />GROUND W A T E R A N D E N G I N E E R I N G G E O L O G Y <br />2951 Curtis Street • Denver, Colorado 80205 • (303) 534-9007 <br />• July 26, 1981 <br />Mr. Robert Fleming <br />Quest Consulting <br />Box 159 <br />Commerce City, Colorado 80037 <br />• Re: Sewage Disposal Plan <br />Subdivision Comprising 14 Lots <br />Parts of NE~SE~ Section 26 and <br />NW~SW} Section 25, T1S, R67W <br />Adams County, Colorado <br />• Dear Mr. Fleming: <br />I have reviewed the proposed plan for development of the subject <br />property. The proposed subdivision will consist of 14 lots, all <br />of which are proposed for individual sewage disposal systems. <br />These lots will be created after gravel extraction, as backfilling <br />• will be done to develop building sites. <br />The backfilling will be accomplished with reject materials from the <br />gravel operation. These materials could be a combination of soil <br />overburden and of granualr materials which are not saleable. The <br />soils on the property- have been mapped by the US Soil Conservation <br />• Service primarily as Nunn loam 0.1% slopes. This soil has a gray- <br />ish-brown loam surface soil and dark grayish-brown and grayish- <br />brown non-calcareous clay subsoil. The underlying material is light <br />yellow-brown and grayish-brown loam and silt loam. A small area <br />in the northeast corner of the property is mapped as Dacona loam <br />1-3% slopes., The surface material is grayish-brown and dark grayish- <br />. brown non-calcareous loam, and the subsoil is non-calcareous grayish- <br />brown clay underlain by light brownish-gray calcareous sandy clay <br />loam. The underlying material is calcareous brown coarse sandy clay <br />loam and coarse loamy sand overlying loose light brown sand and gra- <br />vel. The soil contains 5 to 15% gravel in the surface layer and sub- <br />sgil. The granular materials which are not saleable are likely to <br />• contain considerable sand. Some fines from washing operations may <br />also be included in backfill. <br />It is anticipated that this mixture of materials will be suitable <br />for septic system disposal. However, since it is.not possible at <br />thle time to determine the exact nature of the near-surface backfill <br />• materials at the leaching field sites, engineered leaching field <br />systems may be necessary. Investigations at the site after develop- <br /> <br />