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Home My WebLink AboutRCC AGENDA PK 1999/03/15 - - Drainage Plan In order to accommodate the runoff that currently runs through Poggi Canyon, as well as additional runoff from future deveìopment, the road extension plan includes a drainage system consisting of an earthen channel with drop structures and a detention facility. The minimum depth of the channel is 12 feet, and the bottom width of the channel varies between 30 and 50 feet. Side slopes are proposed at 3:1 in accordance with the City's design criteria. A buffer and a lO-foot wide maintenance trail are also proposed. A smaller temporary channel is proposed for the northern side of the road. At the time the southern side of the road is graded for future development, the temporary channel will be removed and the finished grading will match the northern side of the road. The temporary channel will have drop structures and erosion control landscaping. No native revegetation is planned for the temporary channel. Drop Structures There are 25 drop structures and one culvert on the secondary channel. The main channel has fewer drop structures than the secondary channel since the main channel will have a detention basin in addition to a revegetation area that is currently under construction. Most of the drop structures are 9 feet tall with the same three to one side slopes. The entire drop structure is riprap lined to protect from erosion and to minimize velocities. Detention Basin A large detention basis is also proposed which will accommodate the increased flow rates associated with increased impermeability of the watershed when developed through build- out. The proposed channel design will ensure that the 100-year post-development flood flow exiting the project area is kept to a level that is at or below the 100-year pre- development flows. Because the berm height is less than 25 feet and the basin capacity is less than 50 acre-feet, the detention basin does not qualify as a dam according to State dam criteria. Utilities The proposed project includes the placement of utilities within the Olympic Parkway right- of-way. Wet utilities include the Poggi Canyon sewer and potable water and reclaimed water lines. The Poggi Canyon sewer will consist of an IS-inch sewer lined and associated manholes. Potable water facilities consist of an Otay Water District 16-inch potable water line as well as the relocation of a 54-inch City of San Diego potable water line from Paseo Ranchero to La Media. The reclaimed water lines consist of a 16-inch line from Brandywine to La Media, and an IS-inch line from La Media to Eastlake Parkway. (H, lhomelplanmnglenvlronlís-Oly-pkwy.ND.doc) PlIJe2 - - Borrow Area About 4.7 million cubic yards of cut and fill will be required for project implementation. Fill material required for the project will be derived from five borrow areas within the Otay Ranch property, as well as from Eastlake. The borrow areas will be excavated in accordance with the existing approved development plans for the Otay Ranch, McMillian and Eastlake developments; however, rather than exporting the excess material to an undisclosed location off-site, the fill material that is excavated from these properties will be utilized for the Olympic Parkway construction. With the exception of borrow area one, these areas are void of any sensitive wetland or upland habitat. Borrow area one contains 7.14 acres of coastal sage scrub and 0.87 acres of maritime chaparral. Project Phasinl: Olympic Parkway will be constructed in the following four phases: Phase I (by the year 2000) includes grading the alignment from Brandywine to SR-125, constructing the Poggi Canyon Sewer from Brandywine to SR-125, constructing the water main from Eastlake Parkway to E. Palomar Street, and constructing roadway improvements from Brandywine to Paseo Ranchero. Phase II (by the year 2002) involves the construction of roadway improvements from Paseo Ranchero to E. Palomar Street. Phase III (by the year 2005) includes constructing roadway improvements from E. Palomar Street to Eastlake Parkway and grading thet alignment from SR-125 to Eastlake Parkway. Phase IV (by the 2005) comprises of grading from Eastlake Parkway to Hunte Parkway and constructing ultimate roadway improvements from Eastlake Parkway to Hunte Parkway. Project Permits Required 1. Section 404 permit. Under the Section 404 of the Clean Water Act, placement of dredged or fill material within waters of the U. S. requires a permit issued by the U.S. Army Corps of Engineers. 2. Section 401 Certification or Waiver. The Clean Water Act also requires the issuance of a state water quality certification or waiver under Section 401 to be issued by the Regional Water Quality Control Board for any action that may result in degradation of the waters of the State. (H:\home\plannlng\enV1ron\ls-Oly-pkwy .NU.doc) Pa¡¡c3 - - 3. Section 1603 Agreement. In addition to the federal act requirements, the proposed project constitutes an alteration of a streambed and falls under the jurisdiction of the California Department ofFish and Game pursuant to Section 1600 et seq. of the California Fish and Game Code. Responsible Agencies V.S Fish and Wildlife Service V. S. Army Corps of Engineers Regional Water Quality Control Board (NPDES) Trustee Agencies California Department of Fish and Game C. Compatibility with Zoning and Plans The Olympic Parkway extension project traverses and is consistent with the ciruculation plans of several Planned Communities for which environmental impact reports have also been prepared. The project is also consistent with the Circulation Element of the City of Chula Vista General Plan. D. Identification of Environmental Effects An Initial Study conducted by the City of Chula Vista (including an attached Environmental Checklist Form) determined that the proposed project will not have a significant environmental effect, and the preparation of an Environmental Impact Report will not be required. This Mitigated Negative Declaration has been prepared in accordance with Section 15070 of the State CEQA Guidelines. A discussion of these potentially significant impacts from the proposed project is found in Exhibit "A" as attached. E. Mitigation is found in Exhibit" A" as attached. (H:\home\planmng\enVlron\ls-Oly-pkwy .NO.doc' PIIe4 - - F. Consultation 1. Individuals and Organizations City of Chula Vista: Benjamin Guerrero, Planning Doug Reid, Planning Marilyn Ponseggi, Environmental Consultant Alex AI-Agha, Engineering Cliff Swanson, Engineering Garry Williams, Planning Brad Kemp, Assist. Director of Building Robert Cunningham, Fire Marshal Stephen Preuss, Crime Prevention Joe Gamble, Planning/Landscape Planning Ann Moore, Assistant City Attorney Chula Vista City School District: Dr. Lowell Billings Sweetwater Union High School District: Katy Wright Applicant's Agent: Cliff Swanson, Engineering 2. Documents Chula Vista General Plan (1989) and EIR (1989) Title 19, Chula Vista Municipal Code Biota Survey, Merkel & Associates, Inc. (February, 1999) 3. Initial Study This environmental determination is based on the attached Initial Study, any comments received on the Initial Study and any comments received during the public review period for this Mitigated Negative Declaration. The report reflects the independent judgement of the City of Chula Vista. Further information regarding the environmental review of this project is available from the Chula Vista Planning Department, 276 Fourth Avenue, Chula Vista, CA 91910. EN 6 (Rev. 5/93) (H:\home\planmng\cnv1ron\ls-Oly-pkwy. NO.doc) Pagc5 Mitigated Neg-tive Declaration -- PROJECT NAME: Olympic Parkway Extension PROJECT LOCATION: From the eastern boundary of Sunbow property to a point about one mile east of proposed SR-125. ASSESSOR'S PARCEL NO.: Various PROJECT APPLICANT: City of Chula Vista - Engineering Division CASE NO: IS-99- 20 DATE: February 15, 1999 A. Project Setting The proposed Olympic Parkway is located in an area of the City of Chula Vista known as the "Eastern Territories". The roadway will be an extension of East Orange Avenue, which currently extends from 1-805 in an easterly direction and terminates at Brandywine A venue. This portion of the roadway presently operates as a four-lane major street with bike lanes on both sides from 1-805 to Oleander A venue. East of Oleander A venue, it is a two-lane roadway with improvement along the avenue. The project area is partially developed area of the City. There are several large land holdings, all of which are proposed or approved for development. The preliminary design plans call for the roadway to basically follow the Poggi Canyon. The roadway will steadily climb from Sunbow approximately 20-30 feet above the existing elevation. Several biota studies have been prepared depicting the vegetation found within the roadway corridor. B. Proiect Description Roadway The proposed project consists of the extension of Olympic Parkway (Orange A venue) from the eastern boundary of the Sunbow property to a point about one mile east of SR-125. Olympic Parkway is a 5-mile long roadway which will provide access to 1-805 and State Route 125 (SR 125) from the pròposed development areas of the Eastern Territories of Chula Vista. This portion of the Olympic Parkway extension traverses the planned communities of Sunbow, Otay Ranch, McMillan-Otay Ranch, New Millennium and Eastlake. Olympic Parkway is currently classified by the Chula Vista General Plan Circulation Element as a six-lane prime arterial east ofI-805 to the proposed SR-125. lH:\home\planmng\envtron\as-Oly-pkwy .ND.doc' ~(lt- -.;.- r~-.... _ city of chula vista ~......... ~ planning department - - cnv OF environmental review section CHUlA VISTA