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= Mr. Jim Stevens, CMLRD November 1:1, 1990 -page 2 priests ditch. The ditch was offset fur enough away from the pile as to accoptniodat} additional d:psoil placement during 1990 field season (curreatly adding topsoil to this pile). All construction activity was completed by 11/7/90. i 5. A small berm was identified in the emergency spillway o[ Topper's I}tdustriai Waste Pond. This berm was not part oL the spillway design sad was reritoved on 11/8/90. (Prior to the removal of the berm, Trapprr initiated a wrvey:aad cua- eluded that adequate impoundment freeboard (1.2') rxisted even with the bean intact.) G. Water was identified seeping under the purshall Hume established one Johnson (;ulch pond #10. The source of the water was either hom males streat~it seepage under the flume or from seepage located within an undisturbed area at tht toe of the pond embankment. Un 11/13190, Trnpper used sodium beatoaite ttrc-uad thr upper and lower end of the Iume in an effort to seal aay seepage under the estalt- lished flume. 7. During the inspection of Trapper's equipment storage arcs (fineiliRies) two unmarked containers were identified. The rnntent of the bamis wss Penta, d wood preservative commonly used to treat fence posts. Both barrels were apptupriate~' marked identifying their contents un 11/12190. 8. Mr. Gary Fritz, OSM1t, had a question cunceraing the use of rip rap in our:sodimetit pond construction designs. As explained, rip rap is used in principal siad emei•- geacy spillways only if excessive erosiva is identified as being a pmblem~ Accord- ing to Trapper's Alining and Reclnmation Permit (page 4192) "outflow+ channels will be lined with suitable rip rap or other apppropriate materials to prevent exces- sive erosion." in the case of Johnson Pond #10's emergeacy spilhvay, file existing vegetation is appropriate materials to prevent excessive erosion. Standhrd draw- ings (figures 4.8-4 and 4.8-5, pages 4194 and 4195) do not show rip rap ~a a desiga feature in uny of our sediment ponds. Appendix Q, Sectioa XX, does show some design modifications kir the use of rip rap as a construction apeclllcation on Weit Buzzard Culch t\o. 3. 9. Mr. Fritz, USA1, requested information on the samplfag measuremen/, requlre- meat fur the pieznmeters established un Coyote Dem. In accordance with our approved Mining and Reclamation Plan, no such measuretneats are required. Discussions with 'Trapper's engineers, who have bees inspecting thin structure since its rnnstrttction in 1977, indicate that piezometer samplfag has been con- ducted following construction of this dam but at Inftequent intervals. This puod ~s examined by a qualified person at intervals sot t:xceeding 7 days. Tl#e paad is inspected for structural weaknesses and other hazardous condltioaa wee Italy structural or hazardous conditions were to be ldentlried, pfezometer mat#urements would commcace. Unless required try the Division, Trapper does not Intbnd to iq1- tiate anew piezometer sair~pliug program at Coyote Dam. 10. Mr. Fritz, UtiAI, requested 1nk~rmatiun pertaining to our permit requt ment for permanently attaching collars nn principal spillway discharge pipes. a typicpl standpipe design can Ue found un page 4.193 (figure 4.8~) of'our Iiag and Reclamation Permit. Acrnrding m our permit, no such permanent estt~~~Ilshme~at of rnllars is required. The only potential for the collar t0 ever move wontd be It Ice were to build up nn the pond and force the collar out of place. Trapper had t~te