RES 16819 - Laserfiche WebLink

Mitigation Measure 4.3-5: The proposed project would impact approximately 0.022 acre of Waters of the United States (0.016 acre and 243 lineal feet of drainage channel waters, and 0.006 acre of in-channel wetlands). The connection to Sunset Creek Lane would require approximately 100 linear feet (400 square feet) of additional impact. While compensation for impacts to Waters of the United States shall occur at a minimum of a 1:1 replacement ratio, the CDFW and RWQCB generally require a replacement ratio of 2:1 or better. To the degree possible, the applicant shall replace lost wetland resources in kind. Thus, the project would create channel and seasonal drainage at least at a 1:1 ratio, including a 1:1 ratio of seasonal wetlands on the Lund Ranch property based on the final calculation of impact. Creation of new channels can be logistically difficult as there are finite areas within a site to accomplish this type of mitigation. Therefore, some mitigation for the seasonal channel may have to be out-of-kind. This could be accomplished by creating additional seasonal wetlands. The site supports sufficient opportunities to accommodate creation of wetland habitat. Even if the project could not create 1:1 ratio of channel, there are a number of areas along Drainage Areas A and B and within the non jurisdictional drainage swales on the site that could easily accommodate this type of creation mitigation. The goal of this mitigation should be to create new wetlands and enhance existing wetlands in a way that replaces the functions and values of the wetlands that are proposed to be filled. A qualified biologist should develop a restoration plan that identifies the full extent of the impact, location of suitable sites to create or enhance wetlands of the necessary acreage, and develop success criteria specific to the actual wetland creation design. The mitigation site should be monitored for at least five years. A detailed wetland restoration plan should be developed for this mitigation area during the regulatory permitting phase of the project. The plan will be subject to review by the City of Pleasanton and acquisition of the required permits through City consultation with the USACE, RWQCB, CDFW. This plan should incorporate additional studies and details, including the following: • Type and acreage of wetland to be impacted and goals for wetland creation • Detailed assessment of soil suitability for wetland creation • Description of site hydrology, including depth and duration of inundation, potential for scour or deposit of sediments, etc. • Site preparation measures, including grading methods, to relieve compaction and/or ensure low potential for scouring of soils • Revegetation and erosion control on slopes surrounding the mitigation site • Description of buffer areas around the mitigation • Maintenance program • Long term monitoring program, including performance and success criteria. • Measures to assure protection from human disturbance and to protect the area from development in perpetuity. GEOLOGY AND SOILS(SECTION 4.4) Significant Impact Impact 4.4-1: As is true for the entire region, the project would likely be subject to one or more severe earthquakes and associated seismic hazards during the life of the project. LUND RANCH II (PUD-25)RESIDENTIAL PROJECT 10 FINDINGS