01-14-2002 Council Packet - Laserfiche WebLink

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Task 2 - Location of Wetland Replacement The location of the wetland must be decided upon, which requires an analysis of drainage area and land use, water quality, surrounding vegetation, existing soils, existing water levels, proximity to natural areas, and final rationale for site selection. Much of this has been determined in completion of the initial wetland permit application, but needs to be documented and incorporated into the replacement plan. The remaining hours to complete this task have been included with Final Documentation (Task 9). Task 3 - Determination of Hydrology Jurisdictional wetlands require hydrology to be present as soil saturation to the surface for approximately two weeks within the growing season. To achieve this requirement, examination of hydrology in the mitigation area must demonstrate that sufficient hydrology can be maintained. I1ie type of wetland designed (Type I A) will have seasonal inundation or saturation, but may appear to be dry for much of the year. Determination of hydrology includes calculating water sources and quantity, seasonality of input, control of maximum water level, design of control structures (if needed) to maintain hydrology, maintenance of control structures, and rationale for bottom elevations. This task has not been completed. Task 4 - Soils An evaluation of the soils must be done in conjunction with the mitigation design. Existing soils will be analyzed for permeability, chemistry, and other physical properties. Additional soil borings may be required by the MCWD. The cost for soil borings is not included with this scope. Other soil analysis tasks include estimates of quantity removed and replaced, how the soil will be handled and stored, location of stockpiles, and preparation for planting. This task has not been completed. Task 5 - Vegetation A vegetation planting and maintenance plan will be drafted as part of the replacement plan to create the desired wetland type. Initial analysis will include an examination of existing species in both the surrounding upland areas and adjacent (reference) wetlands. Species will be selected for the wetland and a determination of planting density, location, timing, pretreatment, mulching, and maintenance w ill be completed. This is a critical component of the project and will require the most time to document and design. Portions of this have been completed with the wetland permit application. Task 6 - Erosion Control In conjunction with other portions of the project, a separate erosion control plan will be summarized within the mitigation design. This plan will include placement of BMPs, materials list, timing of controls, and other required erosion control structures. Some of this has or will be completed with the erosion control plan for the greater project, but will need to be summarized and most likely added to the erosion control plan for the mitigation area. Task 7 - Grading Plan and Construction A final grading plan identifying the final size of the wetland and any buffer areas will need to be