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HomeMy WebLinkAboutHDP 02-10; Dunn Residence; Hillside Development Permit (HDP) (27)City of Carlsbad October 18,2002 James Dunn 4316 Cassanna Way #305 Oceanside CA 92057 SUBJECT: CDP 02-42/HDP 02-ION 02-04 - DUNN RESIDENCE Dear Mr. Dunn: The following are issues raised by Engineering Department staff. Please address the issues and return corrected plans and documents to the Planning DeDartment. The Planning Department will route the corrected plans and documents to the Engineering Department for review. I. On the site plan: a. b. d. e. f. g* h. C. i. j. k. Plot existing structures within 100 feet of the subject property; Show the driveway approaches for the southerly and easterly properties; Clarify if curb, gutter and/or sidewalk exists on Highland Drive; Provide a profile of the driveway and include 1 0-foot vertical curves if grade breaks exceed 12%. Provide a typical detail of the retaining wall showing drain location and size of footings; Show overhead utility lines and poles on Highland Drive; Label the setback between the retaining wall and building footings; Label “Existing Drainage 20’ Easement” as “Existing 20’ Public utility Easement for Water Systems, Sewerage, Drainage, Power Line, Excavation and/or Embankment Facilities per File No. 109622, dated June 24, 1963”; Show full length of existinq storm drain to the headwall. Use lighter or screened lines; Plot the one-foot wide lot described as Lot “A“ located between the subject lot and Highland Drive. Remove “separate project” in reference to the storm drain. 2. On profile uPn-uPnl show the temporary 1 : 1 slope to be excavated for construction of the restraining wall. A slope no greater than a 1:l ratio is required for temporary slopes up to 15 feet high according to the soils report. This slope will cross over to the neighbor’s property. A condition will be added to the project requiring that the developer obtain a temporary construction easement from the neighbor to permit off-site grading. Label the flow direction and percent grade of the sewer pipe in Highland Drive. Also, indicate the percent grade and size of the proposed sewer lateral. Label 3. 1635 Faraday Avenue - Carlsbad, CA 92008-7314 (760) 602-2720 - FAX (760) 602-8562 @ the F.L. at the manhole. According to the improvement plans (DWG 131-7), the F.L. is 149.16 feet. 4. According to the assessor's page and Map 4944, a I-foot wide parcel (APN 156- 051-21) labeled as Lot A exists between Highland Drive and the subject property. Since the City accepted this lot but not for public use, the city will process documentation through the City Clerk to accept said easement for public use. 5. Provide a scaled profile of the storm drain and retaining wall at the point where the two cross. Include calculations to verify that the storm drain is located and designed such that it will be able to accept anticipated loads. 6. The proposed storm drain must be a 36" RCP per the "City of Carlsbad Master Drainage and Storm Water Quality Management Plan" dated March 1994. The plan indicates that a 24-inch line is proposed. Correct the plans accordingly. 7. Show proposed 20-foot dedication of a new public utility easement to be aligned with the new location of the storm drain. Depending on the depth of the drain, a wider easement may be necessary. Provide a profile of the proposed storm drain. Place vertical joints on the proposed retaining wall 10 feet on each side of the storm drain or wider if a wider easement is necessary. Also, indicate with a note that the existing easement will be quitclaimed and delineate the portions of easement to be quitclaimed. 8. Show riprap or another acceptable energy dissipater to be installed at the outlet. Although shown partially off-site, details of the location of the outlet and headwall will be determined during at final design subject to any environmental factors. 9. Show direction and percent flow of pad drainage. According to the soils report, no drainage shall be directed to flow over the slopes and drainage must discharge a minimum 10 feet from the building. The plan as proposed does not comply with this requirement IO. Although the Geotechnical Investigation prepared by Ron Gutier and Erik J. Nelson, dated February 17, 1989, analyzes the subject property, it does so for a different project (Proposed Lot Split). In addition it is outdated. Please provide an updated report and address the enclosed highlighted comments. 11. Propose installing curb or another acceptable barrier at the end of Highland Drive to control sedimentation from being transported to the storm drains on Highland Drive. 12. This project will be conditioned to require that the developer submit improvement plans through the City's plan check process to replace the public storm drain extending from Highland Drive to the north end of the property with a new storm drain. Since the existing storm drain is identified on the City's Master Drainage Plan of projects and considering the condition of the existing pipe, we will make a positive recommendation to Council that the property owner be reimbursed for the design and construction costs incurred by property owner to replace and upgrade the existing storm drain line. The amount reimbursed will not include any supplemental costs required to realign the storm drain outside the current ., .-• . _- A drainage easement. As you may be aware, the City has recently requested and was authorized funding by the City Council to begin design of the storm drain replacement. Although the City is working toward replacing the current storm drain with a new drain, construction of that drain may not be completed by the time that you would be ready to start grading of the site. Therefore, if you wish to proceed with processing of your permits and subsequently grading the project site, the project can only be approved on the condition that the developer design and construct the storm drain from Highland Drive to the north end of the property so that the installation of the drain occurs prior to or concurrent with project site grading. The developer’s design and construction costs of the public storm drain are reimburseable, consistent with the terms of a reimbursement agreement negotiated between the developer and the City. If the City’s design and replacement of the storm drain occurs before the developer begins grading the site, no reimbursement agreement will be necessary. With your next submittal to the City, please submit five copies of the corrected site/grading plan and two copies of the soils report. Also, please return the redlined plans and marked soils report with your next submittal. If you have any questions, please contact me at (760) 602-2781. Sincerely, David Rick Assistant Engineer Attached: Redlined site plan Soils Report with highlighted comments C: Robert J. Wojcik, Deputy City Engineer, Development Services Anne Hysong, Associate Planner Julia Coleman, Deputy City Attorney David Hauser, Deputy City Engineer, Planning and Programs