The pipe will be encased in a 21" reinforced concrete pipe sleeve under the dam to protect the pipe and for easy access for maintenance purposes. In addition, the existing sewer line in the affected area will be replaced with a new 8" ductile iron pipe. Because of space constraints and the existence of an 8" sewer line through the dam, the weir is designed as a labyrinth weir wall structure in order to maximize the weir wall length while minimizing the footprint of the structure. ![]() The new dam embankment will be constructed to meet the current safety standards.Ī new concrete weir wall (this regulates water release) structure will be employed. The consultant determined that the pond should be retrofitted to provide the stormwater control for the contributing drainage area. Additionally, the consultant indicated that the dam is in need of repair. The consultant report indicated that the pond is not in conformance with current standards for larger storms. An engineering consultant was hired by DEP to perform an evaluation, and subsequently recommended repair work. An inspection found that several components of the Pueblo Road Pond were in need of repair. Stormwater management ponds in the County are routinely inspected for function and safety. The pond is located adjacent to Quince Orchard Manor neighborhood. ![]() The pond is the last and most downstream in a sequence of several stormwater management ponds. The Pueblo Road Pond is located in a stream valley in the Seneca Creek Watershed approximately 600 feet downstream from Pueblo Road in Gaithersburg. Once the dredging is complete, the staging area and access roads will be returned to pre-existing conditions. The trucks transporting the sediment to the approved disposal facility will likely be utilizing one of the two proposed access roads (Figure 2, shown in green) along Old Baltimore Road. During this project, portions of the walking path will be closed to ensure public safety. The construction activities will take place in the Lake and along the north half of the western shoreline. The excavated sediment will be loaded directly into lined trucks for transport to an onsite staging area (see map above, shown in yellow), where the material will be processed and conditioned, as required, to meet the transport and disposal requirements to an off-site commercial disposal facility. To prevent erosion and sediment migration, control measures will be installed during excavation. ![]() The Lake will be partially drawn down using pumps and pipes, siphoning, or a similar application to divert the water around the proposed dredge area (Figure 2, shown in red) so that work can be performed in drier conditions. The Contractor will be using general construction equipment (e.g., excavator) to perform the dredging. Based on the study, it was determined that approximately 10,000 cubic yards (approximately 1,000 truckloads) of sediment will need to be removed from the southern portion of the Lake to improve its water quality and capacity.
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