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3. Outlet the pond by constructing a bypass to or beyond Crombie pond. This option i. would include re-routing the pond's main inlet pipe along with installing approximately 6,000 feet of pipe leading to or immediately downstream of Crombie pond. 4. Outlet the pond by constructing a bypass to the Eagle Point Lake watershed. This option would also include re-routing the pond's main inlet pipe along with $ installing at least 10,000 feet of pipe leading to the Eagle Point Lake watershed. VBWD will complete a study to determine the most appropriate option considering the cost effectiveness of the project along with its water quality benefits. VBWD may consider adding the Echo Lake outlet, Weber Pond outlet and/or Lake Elmo outlet pipe extension projects to any of these options (see the appropriate individual water management plan section). Estimated costs for each of these options are included in the Capital Improvements section of this plan: A DNR permit will be required for the placement of pipe within the lakebed of Lake Olson. VBWD will continue to measure Lake levels on a monthly basis and send this information to the DNR. Because the Lake Olson pump has not been used for almost 30 years and it poses an environmental threat to the Jordan aquifer, the well should be abandoned. The well abandonment costs are likely to be approximately $5,000, which should be paid for by the owner of the well, the Lake DeMontreville/Olson Association. 4.2.8.4 Water Quality and DNR Data j —BecauseFLakes ille ansonare connected -by a cFiannne ich causes them to react to runoff as a single lake, the water quality of the two lakes is similar. Total phosphorus concentrations in Lake Olson have averaged 0.045 mg/L during the summer growing season, compared with 0.043 mg/L for Lake DeMontreville. Since Lake Olson is shallower than Lake DeMontreville, Lake Olson does not usually thermally stratify. When the lake does stratify, it is only for short time periods, after which mixing occurs. Apparently, the lake mixes frequently during the ice -free period. Since the water quality sampling programs and water quality of Lakes Olson and DeMontreville are nearly identical and to prevent duplication, only differences between the two lakes are discussed in the following paragraphs. The reader is referred to the discussion of the water quality sampling program and the water quality of Lake DeMontreville in Section 4.2.7.3. Although the water quality sampling programs for Lakes DeMontreville and Olson have generally been identical, a few exceptions have occurred. VBWD collected samples from Lake Olson during 1984, and the Metropolitan Council collected samples from Lake DeMontreville that year. In 1980, the Tri-Lakes Association collected samples from Lake Olson, while the Metropolitan Council collected samples from Lake DeMontreville that same year. The water quality of Lake Olson has generally been similar to the water quality of Lake DeMontreville during the period of record. During the early 1970's, the water quality of Lake Olson was better than the water quality of Lake DeMontreville. From the mid 1970's to 1990, the water quality of the two lakes was very similar. However, a difference in water quality was again noted in 1991 and 1992. Both lakes were treated those years with an algicide to reduce 23\82\045\SEC4.RPT\KMH 26 DRAFT: June 23, 1994