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ENV'IRD N'M ENT INC. • ~ ~ • ~~`L•~VLtI PARE 2 ALO ERT FREI AND 6Ofl B. INC. ' TEMPORARY SUPPLY PLAN SEP ~ ~ ~ ~o Q SEPTEMBER 14, 2007 .e - sra ~i ~As ~ used. This other fact that came out during. the review process was that there wa8 24.59 acres of per-1981 lake surface on the site and no credit was take for this as the net depletions were calculated on 72 acres of lake area no the 47.41 acres that should have been used. By 1993 the lake area had reached 79.75 acres as explained in a letter from Frei dated 12/1%93. Originally the site was to be reclaimed as a gravel pit lake that required a large amount of makeup water. In 1997, DWB and SACws purchased this property to construct a water storage reservoir. Albert Frei and Sons, Inc., retained the gravel rights and is required to complete mining and turn the site over to Denver Water by the end of 2002 so they could begin to con- struct the reservoir. Denver Water is working on the design of the liner that will seal the lake area. Review of OSE guideline #B suggests that if a mined area will be lined, and dewatering is taking place during construc- tion, then only the water surface area left during dewatering needs to be accounted for. The attached information is based on that type of plan. The approved reclamation plan has .an option to line the pit. But since DWB not A.F.S., will be lining the reservoir, the final design has not been submitted for review and approval to the Division of Minerals and Geology or the State Engineers Office. Denver Water Board can confirm, how that lining will occur. Reviewing the physical layout of the mine at this time shows that there is approximately 6.57 acres of water surface area. There are two areas containing water a small pond in the north- west part of the mine and the dewatering ditches on the mine floor. The water depth averages 3 feet in the ditches on the mine floor (0.74 ac ±) and the ponds covers 5.83 ac. t (pre-81 water surface). This means that there is less water surface under the dewatering plan than what existed in late 1980. Albert Frei and Sons, Inc., will commit to keeping the .area dewatered so the surface area is less than 25.95 acres until the reservoir liner is complete or they no longer mine in the area.. Once mining ends the property comes. under DWB control so we will encourage teem to continue dewatering until the liner is.complete or revise this TSSP to account for a lager lake area while the liner is being built.