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Overview
Basics
Basics
This project addresses two ongoing habitat concerns at Lake Mill Meadow. This project 1) Adjusts the hydraulic gradient to facilitate terrestrial obligate wetland vegetation, and 2) mitigates an erosion feature in the lower meadow that was altering the meadow hydrology and causing a drop in the groundwater table resulting in loss of wetland/meadow habitat. Project Completed October 2021
Completed
2021
2021
2021
$8,000
Kristin Setty (kristin@nvenv.net)
08/02/2021
11/18/2022
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| Location Information | Location Notes |
|---|---|
Organizations
Organizations
| Glenbrook Homeowners Association (GHOA) | Dianne Felton - (Unknown Organization) | |||
| Nevada Environmental Consulting (NVENV) | Kristin Setty - (Unknown Organization) |
EIP Details
EIP Basics
EIP Basics
01.02.01.0094 - Lake Mill Meadows Project
Performance Measures
Expected Performance Measures
Expected Performance Measures
| Disturbed Areas Restored, Enhanced, or Created | [Disturbed Area Treatment Type: Enhanced], [Ownership: Other] | 0.0001 | acres |
| Disturbed Areas Restored, Enhanced, or Created | [Disturbed Area Treatment Type: Restored], [Ownership: Other] | 0.001 | acres |
Reported Performance Measures
Reported Performance Measures
| Disturbed Areas Restored, Enhanced, or Created | ||||
|---|---|---|---|---|
| 2021 | Total | Units | ||
| Disturbed Area Treatment Type | Ownership | |||
| Enhanced | Other | 0.015 | 0.015 | acres |
| Restored | Other | 0.04 | 0.04 | acres |
| Total | 0.055 | 0.055 | acres | |
| No accomplishments to report for: | |
| Year(s) | 2020 |
|---|---|
| Explanation | The project didn't begin until 2021, which is not an option to select. |
Funding
Expected Funding
Expected Funding
$8,000
$8,000
$0
| Total | |||
|---|---|---|---|
| Glenbrook Homeowners Association (GHOA) | $8,000 | $8,000 | $0 |
| Grand Total | $8,000 | $8,000 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2021 | |
|---|---|---|
| Glenbrook Homeowners Association | $8,000 | $8,000 |
| Grand Total | $8,000 | $8,000 |
Photos
Culvert showing ponded water
(Timing: Before) (~5,146 KB)
Elevation of ground restored to ingress of culvert; eliminating impoundment issues.
(Timing: After) (~1,671 KB)
Headcut propagating from backshore
(Timing: Before) (~6,137 KB)
Erosion control feature built to eliminated headcut propagation further into the meadow.
(Timing: After) (~6,658 KB)
View of wetland north of project site
(Timing: Before) (~4,931 KB)
Headcut propagating from backshore
(Timing: Before) (~6,224 KB)
Project map
(Timing: Unknown) (~7,876 KB)
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
-
The purpose is to decrease the amount of water pooling at culvert by raising the ground surface elevation to match the inlet elevation of the culvert. The stagnant pond formed in front of the culvert creates mosquito issues. This project is part of a broader effort to reduce mosquito habitat and protect and enhance terrestrial wetland habitats. A headcut has propagated from the backshore area over the years and is now encroached upon the hydric soils in the meadow. The headcut has impacted soils below the root zone and is likely to accelerate if left unchecked.
Local and Regional Plans
Related Projects
Related Projects
01.02.01.0094 - Lake Mill Meadows Project is associated with following groups of projects.
External Links
No external links entered.
Notes
Notes
| 10/21/2021 3:39 PM | Sam Sears | No water was present throughout entirety of this two day project. Project was completed well within projected timeline. Project area One has been reseeded with a TRPA approved seed blend and native vegetation around culvert was salvaged. Project area Two - Erosion control feature utilized a geotech fabric placed behind native rock weir built; and will effectively eliminate further undercuts or head cut propagation into meadow. | ||
| 06/23/2021 3:24 PM | Sam Sears | The project area is referenced as Lake Mill Meadow and receives both seasonal runoff from snowmelt and water from Sullivan Springs, a State of Nevada water-righted spring source. In a typical water year flows from the Lake Mill Meadow only reach the shoreline of Lake Tahoe for a short period during spring runoff. This project addresses two ongoing habitat concerns at Lake Mill Meadow. This request seeks to 1) place fill in a stagnant pool created by an elevated culvert under Pray Meadow Road, and 2) mitigate an erosion feature in the lower meadow that is altering the meadow hydrology and causing a drop in the groundwater and loss of wetland/meadow habitat. The proposed erosion control structure will be constructed by hand with native stone to mitigate the erosion and preserve the shallow groundwater table. This small construction project will begin upon TRPA EIP approval and will end approximately 3 to 4 days after start date. USACE (SPK-2021-00082) and NDEP (NV-401-21-003) permits have been obtained for this project. The proposed project consists of two parts, part one addresses the stagnant pool created by the culvert at Pray Meadow Road elevated above the natural flowline. The purpose of part one is to decrease the amount of water pooling upstream the culvert by raising the ground surface elevation to match the inlet elevation of the culvert. The stagnant pond formed in front of the culvert creates mosquito issues and is concerning due to recent sample confirmation of West Nile Virus in the Glenbrook area. This project is part of a broader effort to reduce mosquito habitat and protect and enhance terrestrial wetland habitats within the community. Fill will be placed in areas lower than the bottom elevation of the upstream end of the culvert. Fill of stagnant water will address habitat (mosquito), and water quality issues currently impacting the area. The concrete box culverts under Pray Meadow Road will be unaffected, and only the inlet area will receive fill material and re-vegetation to improve the flow and function of the system. • Fill will be used to bring the upstream meadow ground elevation level aligned with the bottom (invert) elevation of the culverts. Proposed work is to be conducted after spring runoff has ceased. Existing ponded water will be managed with sandbags and will also be pumped into the upstream meadow as required to minimize the potential for discharge and to maintain a dry earthwork placement. • A low-ground pressure rubber tracked excavator will be used to salvage existing desirable vegetation, and soil from the fill area. To the extent possible, work will be done from the roadway and/or the dry /upland areas adjacent to the meadow. Work with excavator within the meadow is not anticipated or optimal and will be avoided to minimize incidental damage to desirable vegetation. • The final surface will be graded flat at the culvert inlet elevation and replanted with the Glenbrook native wetland seed mix and salvaged native materials. The existing ponded area to be filled extends approximately 14-feet wide (north-south) by 23-feet long (east to west), comprising a surface area of 322 square feet. Multiple depth measurements were made to determine the total volume; 320 ft3, or approximately 12 cubic yards of native wetland fill. Fill material will be sourced from the Slaughterhouse Meadow Restoration, an existing approved project constructed nearby. The fill material is native wetland soils from an adjacent area. Care has been taken to ensure this fill material is free from weeds or other contaminates. Part two of this project proposes the construction of a rock grade control structure to mitigate an erosion feature, best described as a deep rill or headcut, in the meadow west of Pray Meadows Road. The headcut has propagated from the backshore area over the years and is now encroached upon the hydric soils in the meadow. The headcut has impacted soils below the root zone and is likely to accelerate if left unchecked. The installation of the grade control structure will stabilize the shallow groundwater system near the ground surface and transition the flowline from the meadow elevation to the existing channel elevation using a rock (erosion proof) drop structure. The nature of this work is more seepage management than flow control and use of an impermeable geotechnical membrane between the rock and native soil, with appropriate key-ways at the edges will control both shallow groundwater, and eliminate the transport of fine sediments. • Tahoe alluvial granite boulders, sourced from Incline, NV. will be used to construct the structure. This rock match the existing color and texture and size of boulders in the area. The riprap will be carried to project site by a skid steer loader via the existing dirt/bark pedestrian trail. • The 12”-18” diameter rocks will be hand-placed. The measurements of the headcut is approximately 50” deep by 36” in width. • Proposed work will be done concurrent with part one, after the spring runoff has ceased to flow. Native live planting (salvaged native plants will be placed over all exposed soils. • While we do not anticipate any discharge, it will be managed through BMPS. There will be no water present at the site during construction. However, wattle and a silt screen will be placed at the west end of the project site to minimize the potential of discharge should an unexpected storm event occur. |