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HomeMy WebLinkAboutHDP 02-10; Dunn Residence; Hillside Development Permit (HDP) (28)L CITY OF CARLSBAD ENGINEERING DEPARTMENT PROJECT REVIEW October 24,2003 TO: FROM: VIA: Anne Hysong - Associate Planner - Planning Departmnet David Rick - Assistant Engineer - Development Services Division Deputy City Engineer - Development Services Division CDP 02-4ZHDP 02-10: DUNN RESIDENCE PROJECT REPORT AND CONDITIONS TRANSMllTAL Engineering Department staff has completed the review of the above-referenced project and are recommending: - X That the project be approved subject to the conditions as listed on the attached sheet. - - X That the project be denied for the following reasons: The following is a final Land Development Section project report for inclusion in the staff report for this project. DEVELOPMENT SERVICES DIVISION Proiect Report LOCATION: North end of the most northerly terminus of Highland Drive (2200 Highland Drive). BRIEF DESCRIPTION : Development of a 3,017 square foot single family dwelling unit and a 2,000 square foot detached garagekhed on a 2.6 Acre property. TRAFFIC AND CIRCULATION: Projected Average Daily Traffic (ADT): 10 A Traffic study was not required because of the minimal impacts of 10 ADT. Comment: The frontage roadways are adequate to accept the additional vehicle loads. SEWER: Sewer District: Carlsbad Municipal Water District 1 Sewer EDU’s Required: (1) edu/dwelling x 1 dwelling = 1 EDU Comment: An 8 inch VCP sewer is located in Highland Drive and currently terminates 50 feet south of the subject property. No sewer laterals currently serve the subject property. Because the street elevation at the northerly end of Highland Drive is lower than the bottom of the sewer manhole located at the end of the sewer main, gravity flow cannot be obtained. Therefore, the developer will install a new 4 pressurized PVC sewer lateral between the sewer manhole and a proposed private sewer pump located on the subject property. WATER: Water District: Carlsbad Municipal Water District GPD Required: 220 gpd/edu x 1 edu’s = 220 GPD Comment: No major water issues are associated with this proposed project. A new 1 inch water service and 5/8” meter will serve the subject property and a new water easement for the meter will be recorded over a small section of the front property. SOILS & GRADING: Quantities: Approximately 10,000 cubic yards of remedial grading. Cut: 486 cy Fill: 334 cy Export: 152 cy Import: 0 cy Permit required: Yes Off-site approval required: No Hillside grading requirements met: Yes (see planning analysis) Preliminary geo-technical investigation performed by: Vinje and Middleton Engineering, Inc. Comment: The 2.5 acre property consists of approximately 4,000 square feet of level area topographically suitable for development at the north end of Highland Drive which is also the southern portion of the subject property. This portion of the property is nearly level with the elevation of Highland Drive. From this pad, the property slopes downward to the north at a 1:1 to 2:l horizontal to vertical ratio. The topography of this 50 to 60 foot high slope was achieved by placing undocumented fills atop natural ground surfaces more than 36 years ago. In order to establish a suitable and stable pad for development, the undocumented fill and a portion of the natural slope will be excavated to the underlying bedrock and recompacted on top of a keyway. Geogrids will be used at the lower portion of the slope for improved stability. Two modular retaining walls are also proposed at the base of the slope to establish a maximum 2:l slope grade as required per City standards. DRAINAGE AND EROSION CONTROL: Drainage basin: A Preliminary hydrology study performed by: N/A Erosion Potential: Currently High. Erosion potential should significantly decrease if the grading design and techniques recommended in the soils report are implemented. 2 Comment: A City maintained storm drain collecting drainage from Highland Drive traverses the property and discharges the storm water at the base of the previously mentioned slope. This drain is broken and is in need of complete replacement. The City is currently working towards replacing this pipe. Construction plans are near completion and funding is in place. A condition has been added to the project requiring that this storm drain be installed prior to or concurrent with the slope remediation planned for the development of the lot. The City is coordinating with the developer to ensure that the grading for both the development of the lot and the storm drain replacement is completed concurrently. Segments of the old pipe will either be removed or filled with slurry and the easement for this pipe will be quitclaimed. The new pipe will be placed in a different alignment and new easements will be recorded. The location of the new pipe and easement was located such that it would not conflict with the proposed single family development. LAND TITLE: Conflicts with existing easement: No Easements dedication required: A 20 foot wide public utility and access easement for the new storm drain and a 5 foot X 10 foot water easement for the proposed water meter will be required. Site boundary coincides with land title: Yes Comment: No major land title issues are associated with this project. IMPROVEMENTS: Off-site improvements: The entire street frontage on Highland Drive will consist of a new driveway approach and a curb inlet. The curb inlet will be constructed as part of the City's Storm Drain replacement project. Standard variance required: None Comment: No major improvement issues are associated with this proposed project. ENGINEERING CONDITIONS NOTE: Unless specifically stated in the condition, all of the following conditions, upon the approval of this proposed tentative map, must be met prior to approval of a building or grading permit whichever occurs first. General 1. Prior to hauling dirt or construction materials to or from any proposed construction site within this project, Developer shall apply for and obtain approval from, the City Engineer for the proposed haul route. 2. Prior to issuance of any building permit, Developer shall comply with the requirements of the City's anti-graffiti program for wall treatments if and when such a program is formally established 3 by the City. 3. Prior to the issuance of a grading permit, the property owner shall enter into an encroachment agreement with the City for the proposed private drainpipe connection to the proposed public storm drain. FeedAareements 4. Developer shall cause property owner to execute and submit to the City Engineer for recordation, the City's standard form Geologic Failure Hold Harmless Agreement. 5. Developer shall cause property owner to execute and submit to the City Engineer for recordation the City's standard form Drainage Hold Harmless Agreement regarding drainage across the adjacent property. 6. Developer shall cause property owner to execute, record and submit a recorded copy to the City Engineer, a deed restriction on the property which relates to the proposed cross lot drainage as shown on the site plan. The deed restriction document shall be in a form acceptable to the City Engineer and shall: A. Clearly delineate the limits of the drainage course; B. State that the drainage course is to be maintained in perpetuity by the underlying property owner; and C. State that all future use of the property along the drainage course will not restrict, impede, divert or otherwise alter drainage flows in a manner that will result in damage to the underlying and adjacent properties or the creation of a public nuisance. 7. Prior to approval of any grading or building permits for this project, Developer shall cause Owner to give written consent to the City Engineer to the annexation of the area shown within the boundaries of the subdivision into the existing City of Carlsbad Street Lighting and Landscaping District No. 1 and/or to the formation or annexation into an additional Street Lighting and Landscaping District. Said written consent shall be on a form provided by the City Engineer. Grading 8. 9. 10. Upon completion of grading, Developer shall file an "as-graded'' geologic plan with the City Engineer. The plan shall clearly show all the geology as exposed by the grading operation, all geologic corrective measures as actually constructed and must be based on a contour map which represents both the pre and post site grading. The plan shall be signed by both the soils engineer and the engineering geologist, and shall be submitted on a 24" x 36" mylar or similar drafting film format suitable for a permanent record. Based upon a review of the proposed grading and the grading quantities shown on the site plan, a grading permit for this project is required. Developer shall apply for and obtain a grading permit from the City Engineer prior to issuance of a building permit for the project. All pad drainage shall be designed to flow away from the slope and to Highland Drive in the event that drainage into any of the yard drain inlets was blocked. 4 - I Dedicationdlmprovements 11. 12. 13. 14. 15. Developer shall cause Owner to make an offer of dedication to the City and/or other appropriate entities for the proposed 20-foot wide storm drainage easement and water meter easement shown on the site plan. The offer shall be made by a separate recorded document. All land so offered shall be offered free and clear of all liens and encumbrances and without cost. Streets that are already public are not required to be rededicated. The alignment and size of said easements shown on the site plan are subject to change. Said easements shall be aligned and sized per the final approved alignments and sizes shown on the City Storm Drain Construction Plans @WG 413-9, Project No. 39051) on file with the City. Additional drainage easements may be required. Developer shall dedicate and provide or install drainage structures, as may be required by the City Engineer, prior to or concurrent with any grading or building permit. The public storm drain, inlets, outlet and other related appurtenances must be installed prior to the issuance of a building permit. All pipe and related facilities shall be constructed per Drawing 413-9 (Project No. 39051) on file with the City unless otherwise directed by the City Engineer. The Developer may construct the storm drain improvements or allow the City to construct or contractually construct said improvements. If the Developer chooses to construct said improvements, he shall, unless otherwise permitted by the City Engineer, execute and record a City standard Development Improvement Agreement to install and secure with appropriate security as provided by law, public storm drain improvements per said Drawing to City Standards to the satisfaction of the City Engineer. Improvements shall be constructed within 18 months of approval of the development improvement agreement or such other time as provided in said agreement. The Developer may be eligble for reimbursement from the City. Reimbursement of any costs must be approved via a reimbursement agreement with the City prior to the issuance of a grading permit. Developer shall have the entire drainage system designed, submitted to and approved by the City Engineer, to ensure that runoff resulting from 10-year frequency storms of 6 hours and 24 hours duration under developed conditions, are equal to or less than the runoff from a storm of the same frequency and duration under existing developed conditions. Both 6 hour and 24 hour storm durations shall be analyzed to determine the detention basin capacities necessary to accomplish the desired results. Prior to the issuance of grading permit or building permit, whichever occurs first, Developer shall submit for City approval a “Storm Water Management Plan (SWMP).” The SWMP shall demonstrate compliance with the City of Carlsbad Standard Urban Stormwater Mitigation Plan (SUSMP), Order 2001-01 issued by the San Diego Region of the California Regional Water Quality Control Board and City of Carlsbad Municipal Code. The SWMP shall address measures to avoid contact or filter said pollutants from storm water, to the maximum extent practicable, for the post-construction stage of the project. At a minimum, the SWMP shall: a. identify existing and post-development on-site pollutants-of-concern; b. identify the hydrologic unit this project contributes to and impaired water bodies that could be impacted by this project; c. recommend source controls and treatment controls that will be implemented with this project to avoid contact or filter said pollutants from storm water to the maximum extent practicable before discharging to City right-of-way; d. establish specific procedures for handling spills and routine clean up. Special considerations and effort shall be applied to resident education on the proper procedures for handling clean up and disposal of pollutants; e. ensure long-term maintenance of all post construct BMPs in perpetuity; and 5 f. identify how post-development runoff rates and velocities from the site will not exceed the pre-development runoff rates and velocities to the maximum extent practicable. Carlsbad Municipal Water District 16. Prior to issuance of building permits, Developer shall pay all fees, deposits, and charges for connection to public facilities. Developer shall pay the San Diego County Water Authority capacity charge(s) prior to issuance of Building Permits. The Developer shall install potable water services and meters at a location approved by the District Engineer. The locations of said services shall be reflected on public improvement plans. The Developer shall install sewer laterals and clean-outs at a location approved by the District Engineer. The locations of sewer laterals shall be reflected on public improvement plans. This project is approved upon the express condition that building permits will not be issued for the development of the subject property, unless the District Engineer has determined that adequate water and sewer facilities are available at the time of occupancy. A note to this effect shall be placed on the Final Map, as non-mapping data. 17. 18. 19. 6