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HomeMy WebLinkAboutCDP 10-05; CARLSBAD BOULEVARD RIPRAP EXTENSION; Admin Decision Letter. CITY OF 9 V CARLSBAD FILE COPY Planning Department EMERGENCY COASTAL DEVELOPMENT PERMIT NOTICE OF DECISION www.carlsbadca.gov March 17, 2010 Jacob Moeder Associate Engineer City of Carlsbad Transportation Division 1635 Faraday Avenue Carlsbad, CA. 92008 Brian Gaudet, PMCI California State Parks San Diego Coast District/North Sector 2680 Carlsbad Boulevard Carlsbad, CA 92008 Jeff Leads Encina Wastewater Authority 6200 Avenida Encinas Carlsbad, CA 92011 SUBJECT: CDP 10-05 -CARLSBAD BOULEVARD ROADWAY & SEWER LINE REPAIRS - EMERGENCY PERMIT The Planning Director has completed a review of the application for an Emergency Coastal Development Permit to install riprap to stabilize and protect the currently eroding southbound Carlsbad Boulevard roadway embankment, relocate a section of the California Department of Parks & Recreation's 6" sewer force main and sewer lift station, and protect the Encina Wastewater Authority's sewer outfall pipeline located under the area in which riprap is planned. Emergency repairs, which would occur in an area south of the Encinas Creek bridge, are necessary as the area along Carlsbad Boulevard was undermined and exposed by severe storms which produced substantial rainfall, flooding and destructive tidal-surge wave action in this area. These events occurred on or about the same time as higher than normal tides produced by an astronomical high tide event. On February 2, 2010, during a routine inspection, City of Carlsbad staff determined that the roadway along Carlsbad Boulevard, south of the Encinas Creek Bridge had been compromised and the integrity of the roadway was at risk. Additionally, it was discovered that portions of the California Department of Parks & Recreation's 6" sewer force were exposed by the recent storm events, exacerbating the unsafe conditions of this area. Staff implemented protocols to ensure the safety of the motoring public, bicyclists, and pedestrians, and a local emergency was declared on February 5, 2010; this declaration has been subsequently extended by the City of Carlsbad City Council. The project description for the emergency permit follows. California Department of Parks & Recreation's 6" Sewer Force Main and Sewer Lift Station The California Department of Parks & Recreation's will relocate their sewer force main and sewer lift station from this area as part of this emergency CDP. If the California Department of Parks & Recreation is unable to relocate their sewer force main in a timely manner, the City will install a temporary sewer bypass line and remove this section of pipeline in order to install the 1635 Faraday Avenue, Carlsbad, CA 92008-7314 T (760) 602-4600 F (760) 602-8559 ® CDP 10-05 -CARLSBAD BOULEVARD RIPRAP EXTENSION March 17,2010 Page 2 riprap in this area. State Parks Department will relocate the remaining sewer force main and sewer lift station afterward. This will be determined in the field as work proceeds on both projects. The State has proposed to tie into the City's sewer force main to the south and east of the current location. Relocating this section of sewer force main will necessitate the removal of the sewer lift station that is located just to the south of the exposed line. The lift station will be demolished and a pre-fabricated lift station will be installed at the north end of the State campgrounds to the south of the project site. Encina Wastewater Authority's Sewer Outfall Pipe Line The Encina Wastewater Authority's (EWA) outfall sewer line is also located in this area. Though the outfall sewer line was not exposed by the storms, the outfall line is underneath where a section of riprap will be installed. The City attempted to locate the depth of the Encina outfall by potholing in the area, but the potholing did not uncover the outfall pipe. Excavation is required to expose the outfall pipe in order to make sure the installation of the riprap does not damage the outfall pipe from the weight of the riprap. Once the Encina outfall line is exposed, and its depth verified, then a modified riprap design will be prepared by the City and a design to protect the Encina outfall will be prepared by EWA. The location and protection of the outfall pipe line is part of this emergency permit and all work on this line will occur landward (east) of the Mean High Tide Line (MHTL). City of Carlsbad's Riprap Extension The northern end of the proposed riprap would start approximately 149 feet south of the Encinas Creek Bridge, which is where the southern end of the riprap will be installed under the Encinas Creek Bridge replacement project that started construction in January of this year (CDP 09-08, SUP 09-03, and HMP 09-06). Placement of riprap will extend southward an additional 280 feet, terminating just north of the California Department of Parks & Recreation's existing sewer lift station. There is some existing riprap in the area, which would be reconfigured and supplemented with an additional 1,434 cubic yards of 4-ton riprap, 1,174 cubic yards of 2-ton riprap, and 673 cubic yards of %-ton riprap on the west side of the roadway. The riprap design is the same as the design used for the Encina Creek Bridge replacement project. The design will need to be modified in the area 25 feet on both sides above the Encina VVastewater Treatment Plant outfall pipe to help protect the existing 48-inch diameter reinforced concrete pipe. The closed southbound lanes of Carlsbad Boulevard, just south of the Encinas Creek Bridge Replacement project site, will be used for all construction staging, including parking for contractors' equipment and vehicles. Excavation and backfill equipment will be stationed on the roadway above the bluff and not on the beach. Sheet piles will be required on the beach, just west of the bluff and east of the MHTL to prevent wave action in the area where the riprap will be installed. The sheet piles will be driven into the ground by either a drop hammer, or a vibratory hammer using a crane with the appropriate attachments. The crane is currently in the area completing work on the Encinas Bridge Repair project and will not have to be brought to this area. The contractor is not allowed to have any equipment west of the westerly sheet piles, nor store any material or equipment on the beach. Beach activity will be limited to installation of sheet piling, replacement and supplement of riprap, excavation of the outfall sewer pipe, installation of a protective cover over the outfall sewer pipe, and the removal of the sewer force main. CDP 10-05 -CARLSBAD ^ULEVARD RIPRAP EXTENSION March 17,2010 Paqe 3 The Planning Director APPROVES this request for an Emergency Coastal Development Permit based upon the following: Findings: 1. An emergency exists that requires action more quickly than permitted by the procedures for coastal development permits or for regular permits and the work can and will be completed by May 28, 2010 unless othenA/ise specified by the terms ofthe permit; 2. At its March 9, 2010 meeting, the City Council of the City of Carlsbad proclaimed the continuation of a declaration of a local emergency to repair/replace roadfill at Carlsbad Boulevard. The riprap extension permitted herein is in response to this declaration. 3. Public notice on the proposed emergency action has not occurred because time did not allow; and 4. The work proposed will be consistent with the requirements of the certified Local Coastal Program (LCP). The project site is located within the Mello II Segment of the Local Coastal Program and within the City's permit jurisdiction as the project has been designed to remain landward (easterly) of the mean high tide line, and thus outside of the California Coastal Commission's retained permit jurisdiction, however, within their appeal jurisdiction. The site is also located within and subject to the Coastal Resource Protection Overlay Zone (Chapter 21.203), and the Coastal Shoreline Development Overlay Zone (Chapter 21.204) ofthe Carlsbad Municipal Code. The proposed project will comply with Mello II Policy 4-6 - "Sediment Control" Practices by adhering to the City's Master Drainage Plan, Grading Ordinance, Storm Water Ordinance, Standard Urban Storm Water Mitigation Plan (SUSMP) and Jurisdictional Urban Runoff Management Program (JURMP) to avoid increased urban run-off, pollutants and soil erosion. The zone is intended to protect sensitive resources. It requires preservation of steep slopes with vegetation (dual-criteria slopes) with some exceptions. No development is proposed in areas of steep coastal bluffs. The proposed project is consistent with the LCP in that the project will protect and stabilize the existing Carlsbad Boulevard southbound roadway and bike lane thereby ensuring access to the shoreline. In addition, the project will comply with Mello II Policy 7-13 - Visual Access by removing the existing above ground sewer lift station structure which will remove an obstruction to public ocean views. In addition, the relocated sewer pipelines will be installed underground, rip rap will be placed at or below existing road level, and the new lift station will be located in a vegetated area without direct ocean view. Therefore, the project will not obstruct views of the coastline as seen from public lands or the public right-of-way, nor otherwise damage the visual beauty of the coastal zone. 5 This emergency project is statutorily exempt from the California Environmental Quality Act pursuantto CEQA Guidelines Section 15269. Conditions: 1. The Planning Director does hereby APPROVE the Emergency Coastal Development Permit, for the project entitled "Carlsbad Boulevard Rip Rap Extension" (Exhibits "A" - ^U CDP 10-05 -CARLSBAD BT)ULEVARD RIPRAP EXTENSION March 17, 2010 Page 4 "E"), dated March 17, 2010, on file in the Planning Department and incorporated by this reference, subject to the conditions herein set forth. 2. The Emergency Coastal Development Permit is granted subject to completion of the emergency repair work by May 28, 2010. 3. The Developers (City of Carlsbad, California Department of Parks & Recreation, and Encina Wastewater Authority) shall submit a formal application for a regular Coastal Development Permit and Floodplain Special Use Permit (Coastal High Hazard area) to the City within 30 days of this letter. 4. The location and protection of the outfall pipe line is part of this emergency permit and all work on this line will occur landward (east) of the Mean High Tide Line (MHTL). 5. The riprap design shall be the same as the design used for the Encinas Creek Bridge replacement project. 6. The contractor is not allowed to have any equipment west of the westerly sheet piles, nor store any material or equipment on the beach. Beach activity will be limited to installation of sheet piling, replacement and supplement of riprap, excavation of the outfall sewer pipe, installation of a protective cover over the outfall sewer pipe, and the removal of the sewer force main. CITY OF CARLSBAD DON NEU Planning Director DN:PD:sm c: California Coastal Commission, Attn: Deborah Lee, District Manager, 7575 Metropolitan Drive, Suite 103, San Diego, CA 92108 State of California Department of Parks and Recreation, Attn: Brian Ketterer, Sector Superintendent, San Diego Coast District/North Sector, 2680 Cartsbad Boulevard, Cartsbad, CA 92008 Skip Hammann, Transportation Director Eva Plajzer, Senior Civil Engineer Dave de Cordova, Principal Planner File Copy Data Entry