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HomeMy WebLinkAboutNORTH CHANNEL AND RIVO ALTOxxxxxxx 640-2281 December 9, 1976 Clerk of the Board of Supervisors P.O. Box 6S7 Santa Ana, California 92702 Subject: Notice of Determination --Maintenance Dredging of West Newport Channels To whom it may conceal: Enclosed is a Notice of Determination for the subject project. A Negative Declaration has been prepared and is on file in our Conunity Development 0epart:nent. If you have any questions, please cell me at (714) 6404128. Very truly yoyrs, Irwin Miller Administrative Assistant Public Works Department IMzjd Enclosure cc: Community Development Department, Bill Foley, N, • June 14, 1976 CITY OF NEWPORT BEACH PUBLIC WORKS DEPARTMENT MAINTENANCE DREDGING OF WEST NEWPORT CHANNELS ENVIRONMENTAL REVIEW --NOTICE OF DETERMINATION A preliminary environmental review of the proposed project forthemaintenancedredgingofWestNewportchannelshasbeencompleted. The review was conducted in compliance with the requirements of the California Environmental Quality Act of 1970, the State Guidelines for Implementation of same, and the City's "Policies and Procedures for Implementing the California Environmental Quality Act." As a result of the preliminary review, it has been determined that: 1. The project is approved. 2. The project will not have a significant effect on the environment. 3. An Environmental Impact Report has not been prepared. A Negative Declaration has been prepared and is attached hereto. oseph T. Devlin, RCE No. 9537 Public Works Director AIM:jd Att. June 14, 1976 TO: ENVIRONMENTAL AFFAIRS COMMITTEE FROM: Public Works Department SUBJECT: MAINTENANCE DREDGING OF WEST NEWPORT CHANNELS Notice of subject i with any findings Attached for the Committee's review and comment are the Determination and the EIR Negative Declaration, for the mprovements. The Public Works Department will supply the Committee additional information which may be required to make and recommendations in this matter. The tentative project schedule calls for construction to start in fall of 1976. Joseph T. Devlin 49'f7U Public Works Director AIM:jd Att. ca 49 rfff 64-.06 1 $',2,. CITY OF NEWPORT BEACH PUBLIC WORKS DEPARTMENT MAINTENANCE DREDGING PROJECT FOR WEST NEWPORT CHANNELS ENVIRONMENTAL STATEMENT NEGATIVE DECLARATION JUNE 1976 I. Location: The West Newport Channels are 100 to 125 feet wide man-made waterways in the City of Newport Beach separating Newport Island from the surrounding area. The project lies southerly of the Pacific Coast Highway between Balboa Boule- vard and Newport Boulevard. II. Project Description: The work consists of the maintenance dredging of sand which has sloughed to the center of the West Newport channels. The length of the project is 1880 feet and the total amount of material to be repositioned will be approximately 5,000 cubic yards. The entire project will take approximately 60 days. A portion of the dredged material will be placed back against the bulkheads and the remain- ing surplus material (approximately 3,000 cubic yards) will be disposed of at sea. The final depth in the center of the channels will be minus 7.0 feet below mean lower low water. The project is jointly funded by the City of Newport Beach and the County of Orange. Plans are attached showing a plan view and cross sections. III. Purpose of the Project: The purpose of this project is as follows: A. Increase the depth of the center of the channel to allow for safer, navigation and improved recreational boating and swimming use. B. Raise the level of the sand at the bulkhead to ensure proper struc- tural stability of the bulkhead. C. Reduce the growth of weeds and the eutrophication of the channel bottom. IV. Discussion of Environmental Impacts: ' A. Land Use Existing land use adjacent to the proposed project is water oriented residential, and the prime recreational facility is the West Newport channels. 4 Environmental Stateme• - Negative Declaration 410 Maintenance Dredging Project for West Newport Channels Page 2 In addition to the local benefit, the channels are within public ownedright-of-way and are used extensively by the general public for boating as well as the adjacent beaches for bathing. B. Marine Environment Three recent projects in the City involving dredging near existing bulk- heads have• had environmental reviews conducted. In late 1972, Marine Biological Consultants, Inc. of Costa Mesa conducted environmental reviews'. for two projects.- the Balboa Cove development and the Bayshores Marina and in 1974•H. V. Lawmaster & Co. Inc. of Stanton conducted an environ- mental review for the Grand_Canal Balboa Island dredging project. In each case the consultants did not identify any significant environ- mental impacts resulting from the dredging work associated with these projects. There would be short term localized siltation and water dis- coloration, but it was concluded that the limited population of bottom dwelling organisms which would be disturbed would be restored in 6 to-- 9 months after dredging. • C. Water Resources This project should not affect the water resourcesof the area. See Section K, Short Term Impacts; for discussion. D. Recreational Environment The dredging of the West Newport Channel will againrestore the boating and swimming activities to their previous level. This will provide a recreational benefit. • E.' Human Resources - There will be no effects on human resources caused by this project: since ' the work is within public owned right-of-way and no relocation of resi- dences will be made. F. Geological Hazards There are no known unique geological hazards within the project area. G. Flooding Erosion or Siltation The project will not affect the potential for flooding as it is already a waterway. The project will not produce any conditions that will cause appreciable amounts of siltation as the channel flow line will be con- structed on a horizontal plane. The project will increase volume of tidal exchange but the associated velocities should be unaffected. H. Groundwater There are no known acquifers in the area of the project. The nature of the construction is such that contamination or blockage of acquifers will not occur. x Environmental Statement - Negative Declaration Maintenance Dredging Project for West Newport Channels Page 3 I. Noise Levels This project will neither increase nor decrease the level of noise in the area. The construction activities will create a short-term increase in noise levels; however, these operations will be limited to working hours to create the minimum of disturbance to neighboring residents. J. Air Resources This project will not increase or decrease the volume of vehicle emissions. K. Short -Term Impacts There will be some short-term water turbidity during the dredging opera- tion. Past experience in dredging the Grand Canal has shown that the proposed hydraulic dredging method, with the discharge spout being kept under water at all times, minimizes water turbidity outside of the project area. There will be a short-term negative aesthetic impact. The dredged material placed against the bulkheads will appear darker than the existing adjacent material. This condition will only exist for a short time until it is bleached by the sun. Another short-term impact will be an inconvenience to boat traffic during construction. The construction noise may also be a minor inconvenience. L. Vegetation and Animal Life There are no known rare or endangered species of animal or plant life within or adjacent to the project area. M. Summary The project does not appear to have a significant effect on the environ- ment and should be of overall benefit to the community. V. Basis for Negative Declaration: The proposed project has been reviewed in conjunction with Sections 15081, 15082 and 15083, Chapter 3--Guidelines for Implementation of the California Environmental Quality Act of 1970, Division 6, Title 14, California Adminis- trative Code. Criteria set forth in those sections indicate that the proposed project will not have a significant environmental impact. CITY OF NEWPORT BEACH PUBLIC WORKS DEPARTMENT MAINTENANCE DREDGING PROJECT FOR WEST NEWPORT CHANNELS ENVIRONMENTAL STATEMENT NEGATIVE DECLARATION BY CITY OF NEWPORT BEACH April 1975 I. Location: - The West Newport Channels are 100 to 125 feet wide man-made waterways in the City of Newport Beach separating Newport Island from the surrounding area. The project lies southerly of the Pacific Coast Highway between Balboa Boulevard and Newport Boulevard. II. Project Description: The work consists of the maintenance dredging of sand which has sloughed to the center of the West Newport Channels. The length of the project is 1880 feet and the total amount of material to be repositioned will be approximately 3,000 cubic yards. The entire project will take approximately 30 days of which one week will be required for pumping. A portion of the dredged material will be placed back against the bulkheads and the remaining surplus material (approximately 2,000 cubic yards) will be pumped in a pipe along 40th Street across the peninsula into the ocean. The discharge pipe will be placed well into the surf zone to allow the currents and surf action to distribute the material along the beach. The final depth in the center of the channels will be minus 7.0 feet below mean lower low water. The project is jointly funded by the City of Newport Beach and the County of Orange. Plans are attached showing a plan view and cross sections. III. Purpose of the Project: The purposepurpose of this project is as follows: A. Increase the depth of.the center of the channel to allow for safer navigation and improved recreational boating and swimming use. B. Raise the level of the sand at the bulkhead to ensure proper structural stability of the bulkhead. C. Reduce the growth of weeds and the eutrophication of the channel bottom. IV. Discussion of Environmental Impacts: A. Land Use Existing land use adjacent to the proposed project is water oriented residential, and the prime recreational facility is the West Newport Channels. Environmental Statement - Negative Declaration Maintenance Dredging Project for West Newport Channels Page 2 In addition to the local benefit, the channels are within public owned right-of-way and are used extensively by the general public for boating as well as the adjacent beaches for bathing. B. Marine Environment Three recent projects in the City involving dredging near existing bulk- heads have had environmental reviews conducted. In late 1972, Marine Biological Consultants, Inc. of Costa Mesa conducted environmental reviews for two projects - the Balboa Cove development and the Bayshores Marina and in 1974•H. V. Lawmaster & Co. Inc. of Stanton conducted an environ- mental review for the Grand Canal Balboa Island dredging project. In each case the consultants did not identify any significant environ- mental impacts resulting from the dredging work associated with these projects. There would be short term localized siltation and water dis- coloration, but it was concluded that the limited population of bottom dwelling organisms which• would be disturbed would be restored in 6 to 9 months after dredging. C. Water Resources This project should not affect the water resources of the area. See Section K, Short Term Impacts, for discussion. D. Recreational Environment The dredging of the West Newport Channel will again restore the boating and swimming activities to their previous level. This will provide a recreational benefit. E." Human Resources There will be no effects on human resources caused by this project since the work is within public owned right-of-way and no relocation of resi- dences will be made. F. Geological Hazards There are no known unique geological hazards within the project area. G. Flooding Erosion or Siltation The project will not affect the potential for flooding as it is already a waterway. The project will not produce any conditions that will cause appreciable amounts of siltation as the channel flow line will be con- structed on a horizontal plane. The project will increase volume of tidal exchange but the associated velocities should be unaffected. H. Groundwater There are no known acquifers in the area of the project. The nature of the construction is such that contamination or blockage of acquifers will not occur. ill . Environmental Statement - Negative Declaration Maintenance Dredging Project for West Newport Channels Page 3 I. Noise Levels This project will neither increase nor decrease the level of noise in the area. The construction activities will create a short term increase in noise levels, however these operations will be limited to working hours to create the minimum of disturbance to neighboring residents. J. Air Resources This project will not increase or decrease the volume of vehicle emissions. K. Short Term Impacts There will be some short term water turbidity during the dredging opera- tion. Past experience in dredging the Grand Canal has shown that the proposed hydraulic dredging method, with the discharge spout being kept under water at all times, minimizes water turbidity outside of the project area. There will be a short term negative aesthetic impact. The dredged material placed against the bulkheads will appear darker than the existing adjacent material. This condition will only exist for a short time until it is bleached by the sun. Another short term impact will be a minimal inconvenience • to boat traffic during construction. The construction noise may also be a minor inconven- ience. L. Vegetation and Animal Life There are no known rare or endangered species of animal or plant life within or adjacent to the project area. M. Summary The project does not appear to have a significant effect on the environ- ment and should be of overall benefit to the community. V. Basis for Negative Declaration: The proposed project has been reviewed in conjunction with Sections 15081, 15082 and 15083, Chapter 3 -- Guidelines for Implementation of the California Environmental Quality Act of 1970; Division 6, Title 14, California Adminis- trative Code. Criteria set forth in those sections indicate that the proposed' project will not have a significant environmental impact. 1 0 CN.AAefJEC. 50' TYPlCALSECTION 5' rstcQFFEEr- is o eoa- NOR/ 2DNTAG IAA, 5C4tg OF FEET 200 0 400 Coo t.,, i Ik 1r- lk fi PC.54* SCAti" Q r FEET. loco Fo- " loon soow- y LOCA" TIOM MAP'" From CB&S Chew"' 4b 2451-//! NW Aga: 722/7'BE'aFIt'e tE-'' og 4IEo C&FR' B L` PROPOSEIJ wet ir /tNLt CN4VNEG. ORFDG/N6 N Newport Deceit ` , • ' AT NOWA Chor,ne/ and The iZivcAlto- - CO(.iNTY. OF' Orange: 'STATE• Ca/ifornia - • rt./CAT/ON QY City : of Newport • Beach - DATE - 3