HYDRO22528 - Laserfiche WebLink

Home Browse Search

:- ~~I ~I~II~~I~~~~~II~ ~~ ~~AL~ 2Q, ~ COf~9PAiU1< November 1, 1985 Ms. Candace M. Thompson Colorado Mined Land P,eclamation Division 423 Centennial Building 1313 Sherman Street Carver, Colorado 8G203 SUBJECT: Gulch A Sediment Pond Certification File Number C-019-81 Dear Ms. Thompson: 5731 State Highway 13 Meeker, Colorado 81641 (303) 624-4457 RECgjy~~ Np~pB~ ~~~ ~~o Na 4r~~MAT/pIV ~rces Attached fcr your review is the Certification of the final construction of the Gulch .'; Sediment Pond. in addition to the Certification, the following figures/drawings are ;ncluded for your review: I. Ficura 1: Pier view of Gulch A pond s!~owing the completed por~J, )ecation of emergency spillway, location of primary spillway ar~d dewatering device, discharge flume, rip rap areas, access read for future dr_dging, and cleaning pad for future dredging. 2. Figure 2: Cross sections of dam and emergency spillway. The cross section locations are shown in Figure 1. 3. Fiqur= 3: Plan view of Gulch A Pond showing locations ''hat bentonite was mixed with native soils to ensure stability. 4. Figure 4: Locations for compaction tests. 5. Table 1: Data su:rettarv for Gulch A Pond. All specifications in the approved plan for the Gulch A Pond have been met or exceeded as shown in the following data summary (Table 1). As shown in the accompanying figures, the excavation was two feet deeper than originally designed. Since an access road and cleaning pad for future dredging were added to the structure during construction, a subsequent decrease in capacity t~rould have occurred, so additional capacity was obtained by excavating two feet deeper. In addition, the width of the emergency spillway was increased so the slope on the sides of the spillway could be decreased to accommodate future truck traffic from the cleaning pad. The cross sectional area of the emergency spillway increased from 45 ft.2 to 52 ft.2.