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1 <br />1 <br />' INTRODUCTION <br />' Obering, Wurth & Associates (OWAl was initially contacted by C;istle <br />~ Concrete Company, through their Environmental Consultant, Mr. Mark Hei:Fner, <br />Denver, Colorado regarding a slope stability problem and resultant complai:~t at <br />their Snyder Quarry Access Road in early July, 1988. The problem was <br />' initially discussed with Mr. Heifner, a report reviewed, photographs examined, <br />and a field inspection scheduled. <br />' The referenced Heifner report addressed a complaint Prom a Mr. Nagel, a <br />resident in the Cedar Heights development, within view of the problem ~:rea. <br />The report discusses four (4) "Pill and spill" areas along the access road and <br />has Labeled the slope stability problem as AREA 1. The report defines AREA <br />' AE1 as an area that has been subject to considerable downhill geologic <br />movement oP the surface crust of the earth overlaying a shale area to the <br />extent of creating a stream blockage at the toe oP the canyon. The blockage <br />' has resulted in the impoundment of a permanent pool of water upstream. <br />It is the intent of the Owner, Castle Concrete Company, to remedy this <br />problem as soon as possible in as efficient and environmentally undisruptive <br />way as possible. This report offers suggested remedial actions and subsequent <br />conclusions. <br />FIELD INSPECTION/OBSERVATIONS <br />A field inspection oP the Snyder Quarry Road, and AREA * 1 in particular <br />was conducted by the author of this report together with Mr. Gordon Morgan, <br />Castle Concrete Company, and Mr. Mark Heifner, Environmental Consultant to <br />the Owner on Thursday, July 14, 1988. A series of ground photographs vrere <br />taken during this field inspection. <br />The problem AREA #1 is located on the North side of the Snyder Qu:irry <br />' Access Road, approximately 0.7 miles above the Cedar Heights Guard House. <br />The site is easily identifiable as one travels toward the quarry operation since <br />considerable road damage and displacement has occurred in recent years :is a <br />' result of the slope instability. The Owner has continued to dump Loose <br />limestone tailings at the area of damage in an effort to stabilize the haul <br />road. <br />' Prior to descending to the bottom of the canyon, 1980 aerial topography <br />was examined. The pre-slope failure elevation differential from the haul road <br />to the thread of the stream was approximately 120 feet. This differential <br />' occurred in a distance of about 220 feet resulting in a natural or hist~~ric <br />slope of 1.8:1. <br />' The field inspection of the slide area resulted in the following <br />observations. The depth of blockage at the thread of the stream likely ranges <br />from about 15 feet at the upstream side to over 30 Peet at the downstream <br />side. Length of the blockage is 125'-150'. The area of inundation above the <br />1 <br />1 <br />1 <br />