Al Tahoe Erosion Control Project 1, EIP #696

Al Tahoe Erosion Control Project 1, EIP #696

Project 1 includes ~55 acres characterized by a very flat slope, bare compacted soil shoulders, and dense residential land use. The entire project area consists of one main watershed that drains to the Pasadena storm drain. Project 1 includes stabilization of the contributing shoulders that drain to the Pasadena storm drain and installation of pretreatment and media filters at the existing outfall of the storm drain upstream of Lake Tahoe. Currently, the Pasadena storm drain discharges to Lake Tahoe without any treatment. Therefore, the installation of pretreatment and media filtration will have an immediate water quality improvement to the discharge to Lake Tahoe. The main purpose of this public project is to treat the water quality impacts from the City's Right-of-Way (ROW) and consequently the project will focus improvements within the City's ROW. To date, no engineered water quality improvement projects have been implemented in Al Tahoe. The specific issues associated with the Project 1 area are described below: The Project 1 area is the portion of the Al Tahoe neighborhood that drains to the Pasadena storm drain. The area is adjacent to Lake Tahoe and is characterized by low slopes, seasonal ponding, compacted earthen eroding shoulders that collect and convey flow, and flat roads that experience ponding or drain to yards. The predominantly unpaved shoulders range in width from one to 10 ft and have only sporadic vegetative and pavement coverage. Surface slopes along the streets range from 0.2% to 1.2%. Much of the pavement along the side of the road has deteriorated due to erosion, parking on the shoulders and snow plow damage. The Pasadena storm drain extends down Pasadena Avenue from Modesto to Lakeview Avenues, Lakeview Avenue from half a block west to half a block east of Pasadena Avenue, and Tallac Avenue from Riverside to Pasadena Avenues. The storm drains outlets directly to Lake Tahoe at the end of Pasadena Avenue. The drop inlets that discharge to the system have mostly unclogged grates with pine needles and yard waste collected in the inverts; the pipes of the system range from completely clear to partially block. Drainage complaints submitted by residents of the area refer to standing water, clogged inlets due to snow, and water drainage into driveways and yards. Action is needed at this time to address issues related to water quality in the Al Tahoe Project 1 area and its stormwater and snow melt dishcharge into Lake Tahoe. There is a need to maximize source control and provide pretreatment for its runoff prior flowing into the Lake Tahoe.

South Lake Tahoe

El Dorado

California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 3 (DOT), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Lahontan South Lake Tahoe Region 6 (RWQCB), Department of Water Resources, Resources Agency, Tahoe Regional Planning Agency (TRPA), California Native American Heritage Commission (NAHC)

California Native American Heritage Commission (NAHC)

environmental improvement