 |
|
 |
|
 |
|
 |
|
 |
|
 |
|
|
|
|
||||||||||||||
|
|
|
|||||||||||||
|
|
|
|||||||||||||
|
|
|
|
|
During the Spring of 2003, a subcontractor to the Placer County Facilities Services Department damaged the Squaw Valley Park meadow with a D-10 Caterpillar earthmover, and damaged the ephemeral drainage nearby by incorrectly placing a 24" corrugated metal pipe in the drainage alignment, rip rap in the channel on both sides of the pipe, and soil over the top to allow vehicles to pass. The Lahontan Regional Water Quality Control Board (RWQCB) required that the damaged areas be restored as closely and as quickly as possible to their pre-damage condition. North Fork Associates, in association with Kelley & Associates Environmental Sciences, developed a restoration program that met RWQCB and County requirements, conducted a site visit, and submitted a detailed work plan. North Fork and Kelley & Associates had conducted wetland delineation of the area during the planning process for the park in 1997. The delineation included detailed soil and botanical analyses of the meadow, which was utilized in development of the restoration plan. Meadow restoration included soil reconditioning and contouring to alleviate compaction and revegetation with sedges, grasses, and other plant species of the meadow was promoted through natural recruitment to restored soils. In addition, the soil seed bank was augmented with seeds from other parts of meadow, which were harvested when seeds were suitably mature for propagation. Ephemeral drainage restoration included implementing temporary and permanent BMP's; removing fill rock, revetment rock, culvert, and fill wedge to original contours for length of fill wedge; establishing abutments to allow 18' bridge span; restoring the original contours to channel bottom and flanking banks; and restoring the layer of woody debris to densities observed upstream of the crossing. Restoration work has been completed as prescribed in the plan. After channel restoration and bridge construction were complete, North Fork conducted an evaluation of the necessity of revegetating portions of channel bottom or flanking streambanks. North Fork has conducted field monitoring each year since the completion of the restoration, and has submitted annual reports to both the County and to the RWQCB. Monitoring is to continue through 2008. |
|
|
|
||||
|
|
|
|
|
|
||||
