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� a <br /> SUNNYSIDE GOL13 CORrOAATION T 14 r99 <br /> AN ECHO 33AY COMPANY 9 <br /> s 0o"�o Fold O <br /> P.PhoneO(9 0)x387-55 3 •i1@rton, CO Fax (9 0)81433 <br /> 387 5310 Go o <br /> � �y <br /> �q uVQ Ms. Sarah Johnson �,t v <br /> Colorado Department of Public Health and Environment <br /> QCD-PE-B2 <br /> 4300 Cherry Creek Drive South ✓ <br /> Denver Colorado 80246-1530 X <br /> RE:Mayflower Facility—Upland Hydrological Control Project completion <br /> certification <br /> -CDPS Permit No. CO-0044768, San Juan County <br /> -Consent Decree and Order, Case No. 94 CV 5459 <br /> Dear Ms. Johnson: <br /> This letter report and inspection request is submitted to request inspection by DMG for <br /> project completion according to the work plan and confirmation of project completion by <br /> the Division according to the terms of the Consent Decree and Order (Section IV.8a). <br /> Due to the potential for a snowstorm to occur and obscure the project area for the season, <br /> an inspection should be arranged at the Division's and DMG's earliest convenience. <br /> Sunnyside Gold Corporation (SGC) has completed the B List—Mayflower Facility— <br /> Upland Hydrological Control Project according to the work plan. Following is a <br /> summary of the work completed for this project. <br /> SGC had identified three drainage paths with significant surface/subsurface flows <br /> upgradient from Tailings Pond No. 1 (TP1) and the Mayflower Mill. Starting from the <br /> west end of TP1, they are called Drainage A, Drainage B, and Drainage C. <br /> Drainage A <br /> The natural drainage was followed upgradient until the flow could be isolated on a rock <br /> outcrop. An excavation was made in the drainage and a 4-foot diameter manhole <br /> installed. Approximately 20 feet downgradient another 4 foot diameter manhole was <br /> installed as a secondary catchment. The manholes were connected with 24" ADS pipe <br /> and the outlet from the lower manhole was extended to the lined diversion ditch installed <br /> on TP1 with 24" ADS pipe (approximately 660 feet). Bowls were formed around the <br /> manholes with the manholes being drains for these bowls. The bowls were then shotcrete <br /> lined. The upgradient bowl was covered with a rock cover to restore the drainage <br />