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<br />., <br />COLORA00 WE~TMORFLAND INC, <br />COLORADO P+INED LANG RECLAMATION BOARD CFRTIFIf.AT10P~ <br />• ORCHARD VALLEY WEST MINE POND <br />PROFESSIONAL QUALIFICATIONS <br />Matthew S, Sakurada graduated from Oolorado State I~niversity with a Bachelor of <br />Science-Civil Engineering in 197x, He also graduated from the University of <br />Colorado with a Master of Engineeriny deyree in 1979, He has heen a profession- <br />al engineer in [he State of folorado since 1978, He has experience and knowl- <br />edge in the design and construction of dams, drainage control, hydrology, and <br />structures, He is also experienced in permitting of coal mine facilities and <br />permit compliance. <br />RULE REOIJIRING CERTIFICATION <br />This certification is required by Rt,le 4,05,6(7) Of the Pequlations of the O,olo- <br />rado Mined Land Reclamation Board for Coal Mining, <br />SIIRJECT OF f,ERTIFICATION <br />This certification is for the Orchard Valley 4~PSt Mine sedimentation pond, <br />ACTIONS TAKEN TO PREPARE CERTIFICATION <br />The design of the pond was completed by Graeme Major, P, E, of (.older Associates, <br />• Calculations were completed ny O,raeme Major on the stahility, spillway capacit_; <br />and volune of the dam as required by CMLRD rules, <br />Laboratory tests were taken to classify soils in the area and complete a Proctor <br />test for compaction purposes, <br />Field on-site inspections were completed daily from Nov em her 13, 1986, through <br />January 16, 1987, Compaction, culvert installation, and other field construc- <br />tion was inspected and documented, <br />The construction followed the documents suhmitted in permit application a0.-R3- <br />038 to the Colorado Mined Land Reclamation Division, <br />Matthew S, Sakurada consulted with (;raeme Major, P,E „ designer of the sedimen- <br />tation dam, <br />PROFESSIONAL OBSERVATIONS ANO CONCLUSIONS <br />Compaction was completed using portahle "jumping jacks" as specified in a- to R- <br />inch layers, The culvert was constructed per manufacturer's recommendations. <br />Final inspection shows no instabilities, leakage or adverse envirornnental conse- <br />quences, <br />The pond volune was surveyed by Jesse Messenger, PLC, clean-out and storage <br />• levels were marked by CWI personnel, <br />