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~~ blue <br />ribbon <br />Goal <br />company <br />POM1TD t:3 A~:n t'4 CERTIFICATION <br />Pond ik3 and ~k4 were originally certifieJ June 1, 1983 <br />blue ribbon coal company <br />p o. box 58 <br />delta, Colorado 81416 <br />1303)874-7561 <br />Flooding `rom <br />snowmelt occurred on itay 15, 1984, which washed out the emergency spillway <br />nn the ;k4 Pond. The v3 Pond was una['ected other than being backrilled with <br />water. A storm event caused 'boding June 7, ]9R4, e.hich washed out a 30 <br />section of the ik4 Pond embankment and "filled t}te q.3 Pond with silt and sand. <br />The c;.use o: the high waters 'loodinb into the ponFs was the 9 culvert used <br />roe access across Hubbard Cr!•ek not being capable n~ handling the volume of <br />water. <br />~r'o structural damage was done to th^ ;k3 Pond. The ::ilt and sand was dredged <br />from the potrd leaving a capacity slightly ler~c•r than original. In [he dredging <br />process the dewateriny deice artci the primary :;piJlway wr_re broken off. These <br />devices were replaced dune 21, J984 with their levels being adjusted to meet the <br />designed sediment and water storage volumes. "he attached drawing shows the <br />volume o'' each section end the elevations of t}e dischar.;e device::. <br />'ih~• damage to the 4 Pond way r. ore extensive due to the speed and volume <br />o{ wai•cr Mowing across it. Kr-establishment o} the embankment was done using <br />a loader to distribute and comp+tct 6-12" lifts oC dirt. At approximoCely 2' <br />above the bottom Of the pond a trench was dug to install the S" pvc pipe for <br />the primary spillway and the devntering device. Concrr_te was placed over the <br />center of the pipe to act ae water cuto~F and the trench was backFilled using <br />a post to ta~tp th dirt around the pipe. When the emitnnkment was nearly.compl~te <br />another trench vas dug [o place the emergency :spillway. Again a post was used <br />to trmo dirt around the pip.. Reconstruction of this pond waS co~nrleted on <br />