Agenda - 09-01-2009 - 6a - Laserfiche WebLink

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® As previously noted, a wetland reconnaissance investigation was conducted for the remainder of Site 056. The property boundaries were walked and several traverses conducted across the site. Areas that appeared to meet the criteria for jurisdictional wetlands or streams were approximately located and preliminarily mapped. See the attached site layout drawing for the wetland delineation line (i.e., a site reconnaissance was prepared for the area (west LLC property) north of the line and a detailed wetland delineation for the property south of the line). The findings of the wetland investigation and site reconnaissance were documented by HOA in the revised wetland and Endangered Species Investigations report dated April 29, 2009, which was made available to the public as part of the WTS siting process. ® Summit Consulting surveyed and prepared mapping for the wetland boundaries identified and flagged by HOA during their detailed wetland investigation of the southern half of the site. This survey was used by Olver Incorporated to establish potential wetland impacts resulting from development of the proposed WTS on the site. ® Based upon the preliminary WTS site layout, wetland impacts are avoided with exception of one crossing of a wetland area by the entrance road.. ® The USCOE conducted a site investigation of the wetland delineation prepared by HOA on June 18, 2009, and made minor adjustments to the wetland boundary previously established. ® A final survey (plat) of the wetland boundaries was prepared by Summit Consulting and submitted to the USCOE for certification. The USCOE 'issued (on August 11, 2409) a Notification of Jurisdictional Determination certifying that the plat accurately recorded the boundary of the jurisdiction of Section 404 of the Clean water Act. The total jurisdictional wetlands as certified by the USCOE is 5.66 acres (0.85 acre of Tract 1 and 4.81 acres of Tract 2). Note: Tract 1 is the USCOE designation for the 8.0 -acre parcel of property adjacent to Highway 54, and Tract 2 is the USCOE designation for the southern end of the 142.7 parcel. The preliminary site plan was revised with respect to the certified wetland delineation. Based upon the preliminary layout,. approximately 2700 square feet (0.062 acre) of actual wetlands would be disturbed by the entrance road crossing. See attached site layout. The receipt of the Notification of Jurisdictional wetlands from the USCOE represents the completion of a significant step in the development of the WTS site. The determination of the extent of wetlands by the USCOE is a necessary and well- established process, needed to provide a basis for design of the facility to avoid impacts to jurisdictional wetlands, and a means to mitigate impacts where they cannot be avoided. Any work impacting jurisdictional wetlands will be done under permits from the USCOE. As stated above and as has been noted publicly at several regular BOCC meetings and/or work sessions, the entrance road into the WTS will need to cross a narrow strip of linear wetlands. The following steps will be taken regarding permitting of this wetland crossing: The entrance road crossing will be designed to minimize the impact to the wetlands by crossing a narrow portion of the strip of wetlands at a right angle. Refer to the proposed site layout. This preliminary layout is based on the standard of avoiding impacts to the maximum extent practicable. Waste Transfer Station Siting Page 2 August 24, 2409 Status of wetland Determination 'Final