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Home My WebLink About2001-06-06; Planning Commission; ; CDP 00-65 - CLEMENTS RESIDENCETne City of CARLSBAD Planning Department A REPORT TO THE PLANNING COMMISSION Single-family Coastal Development Permit Item No. P.C. AGENDA OF: June 6, 2001 Application complete date: January 19, 2001 Project Planner: Paul Godwin Project Engineer: David Rick SUBJECT: CDP 00-65 - CLEMENTS RESIDENCE - Request for approval of a Coastal Development Permit to allow for the construction of an 824 square foot second story addition to an existing single-family residence within the City's Coastal Zone located at 5021 Tierra Del Oro within Local Facilities Management Zone 3. I. RECOMMENDATION That the Planning Commission ADOPT Planning Commission Resolution No. 4996 APPROVING Coastal Development Permit CDP 00-65 based upon the findings and subject to the conditions contained therein. II. INTRODUCTION Pursuant to Section 21.201.030 of the Carlsbad Municipal Code, the proposed addition to an existing single-family home within the City's Coastal Zone requires the processing and approval of a Coastal Development Permit (CDP). The CDP application was reviewed for consistency with LCP policies and implementation. There are no unresolved issues. The staff recommended approval with conditions is supported by the analysis as follows. III. PROJECT DESCRIPTION AND BACKGROUND Project Site/Setting: Existing single story, single-family residence located on the west side of Tierra Del Oro as shown on the attached location map. The lot area is .32 acres (14,100 square feet) and is located within the appeals jurisdiction of the California Coastal Commission. Proposed Residential Construction: New 824 square foot second story addition to an existing residential structure, creating a total building square footage of 2,440 square feet. The proposed addition will not change the existing footprint of the structure. The proposed project has been designed to retain a single story fa?ade along Tierra Del Oro by placing the second story addition over the rear half of the existing structure. The maximum height of the second story addition will be 25.5 feet and incorporates a hipped-roof design to minimize view impacts. The existing structure is non-conforming due to an inadequate west side yard setback of five feet (six feet is required). As described in chapter 21.48.090 of the Carlsbad Municipal Code, buildings which are non-conforming due to inadequate yards may construct additions which do not exceed 40% of the original square footage of the structure. The original square footage of the structure is 2,086 square feet. Total allowed additions, given the non-conforming side yard, may not exceed 834 square feet. The proposed addition is 824 square feet. CDP 00-65 - CLEMENT June 6, 2001 Page 2 SIDENCE Proposed Grading: No grading is proposed. Impact on Coastal Resources: None. IV. ANALYSIS As shown on the Coastal Development Compliance Table below, the proposed development is in compliance with all applicable regulations. Building permits may be issued subject to the conditions contained in Planning Commission Resolution No. 4996. COASTAL DEVELOPMENT COMPLIANCE TABLE LCP Land Use Plan General Plan Zoning Grading Permit Required Hillside Development Permit Required Native Vegetation Impacts STANDARD Front Yard Setback Side/Rear Yard Setback Max Building Height Lot Coverage RLM/OS (Res. Low-Medium RLM/OS (Res. Low-Medium R-l and Open Space) and Open Space) No No None REQUIRED/ALLOWED 20 Feet 6V12' 30' 40% PROPOSED 20' 5V150' 25.5' 15% Review of Required Coastal Findings 1. Conformance with the Certified Local Coastal Program and all applicable policies. The project is located in the Mello II Local Coastal Program Segment. The project proposes the construction of a second story addition on an existing single- family residence in an area designated for single-family development. As discussed below, the project complies with all applicable LCP provisions. The LCP Land Use Plan designates the site for RLM (Residential Low-Medium) density Development. The property is zoned R-l and therefore allows for single-family development. The proposed 824 square foot second story addition will be placed over the existing structure and will not increase the building footprint. The proposed project has been designed with single-story fa9ade along Tierra Del Oro, which helps to reduce the visual impact from the street. There will be no further encroachment into the existing non-conforming 5' north side yard setback. There are no agricultural resources located on the property. Public views of the coastline will not be further altered or impacted. 2. Conformance with public access and recreation policies of Chapter 3 of the Coastal Act. Per the Local Coastal Program, the subject site is not required to provide beach access. No opportunities for beach access exist on the site. CDP 00-65 - CLEMENT June 6, 2001 Page 3 SIDENCE 3. Coastal Overlay Zones. The subject site is located in the Coastal Resource Protection Overlay Zone, which requires that steep slopes of 25% grade and over be preserved in their natural state. The proposed second story addition does not impact any slopes and utilizes the existing building footprint and structural stringline setback. The proposed project complies with all applicable requirements of the Coastal Resource Protection Overlay Zone as illustrated in the table below: FINDING That a soils investigation be conducted to determine that the site slope areas are stable and grading and development impacts mitigable for at least 75 years, or the life of the structure. Grading of the slope is essential to the development of the site. Slope disturbance will not result in substantial damage or alteration to major wildlife corridors, habitat or native vegetation. No grading or removal of steep slopes will be permitted unless all environmental aspects have been mitigated. RESPONSE A soils and geologic analysis of the site was prepared in conformance with City requirements. The study determined that the proposed development will have a useable life of at least 75 years and that the development will have no adverse effect on the stability of the coastal slope. No grading is proposed. No slope disturbance is proposed. No grading or slope removal is proposed. Drainage, Erosion, Sedimentation and Habitat As designed and conditioned, the proposed project will adhere to the City's Master Drainage and Storm Water Quality Management Plan and Grading Ordinance to avoid increased run off and soil erosion. Landslides and Slope Instability The soils and geologic analysis report performed for the proposed project indicates that the conditions required for landslide threat are not present, thus landslide possibility is low. Seismic Hazards The soils and geological analysis report performed for the proposed project indicates that the materials at the site are not subject to liquefaction due to such factors as soil density, grain-size distribution and groundwater conditions. Floodplain Development No development on the property is proposed within the one hundred year floodplain. CDP 00-65 - CLEMENT June 6, 2001 Page 4 SIDENCE 4.Coastal Shoreline Development Overlay Zone The proposed development complies with all applicable requirements of the Coastal Shoreline Development Overlay Zone as described in the table below: STANDARD PROVIDED Lateral Access 25' dry sandy beach Proposed second floor addition does not impact existing lateral access and is located more than 100' east of the beach area. Bluff Top Access Applies to lots where no beach is present or where beach is not accessible. Per the Local Coastal Program, this site is not required to provide public beach access. No opportunities for beach access exist on the site. Geotechnical Report Analyze cliff erosion and geologic conditions. A geotechnical analysis of the project was prepared. The analysis concluded that the proposed development will have a useful life of at least 75 years and that the development will have no adverse effect on the stability of the coastal slope. Appearance Building developed on-site with a general attractive appearance related to surrounding development and natural environment. The proposed residential structure has been designed with attractive architectural features, which will be compatible with the surrounding development and natural environment. Ocean Views Building designed to preserve to the extent feasible ocean views. The project has been designed with a one-story element on Tierra Del Oro Street and the structure complies with applicable side yard requirements, which will, to the extent feasible, preserve existing ocean views from the street. Natural Features To extent feasible, retain natural features and topography. No slope development is proposed and the existing building footprint is not being expanded Grading Grading executed so as to blend with existing terrain. No grading is proposed. 'Stringline" Maintain a "stringline" setback for structures, patios, decks, pools and spas The project adheres to all coastal "stringline" setback requirements for the placement of structures, patios and decks. V.ENVIRONMENTAL REVIEW This project is exempt from CEQA per the exemptions listed below: (1) Section 15301 of CEQA exemptions (Class 3) exempts additions to existing structures which do not exceed 50% of the floor area before the addition or 2,500 square feet, whichever is greater. rm*CDP 00-65 - CLEMENLTRESIDENCE June 6, 2001 PageJ A Notice of Exemption will be filed by the Planning Director upon project approval. ATTACHMENTS: 1. Planning Commission Resolution No. 4996 (CDP) 2. Location Map 3. Disclosure Form 4. Background Data Sheet 5. Local Facilities Impact Assessment Form 6. Exhibit(s) "A" - "G" PG:cS SITE—>J CLEMENTS RESIDENCE CDP 00-65 •^P' ^^ City of Carlsbad Planning Department DISCLOSURE STATEMENT Applicant's statement or disclosure of certain ownership interests on all applications which will require discretionary action on the part of the City Council or any appointed Board, Commission or Committee. The following information MUST be disclosed at the time of application submittal. Your project cannot be reviewed until this information is completed. Please print. Note: Person is defined as "Any individual, firm, co-partnership, joint venture, association, social club, fraternal organization, corporation, estate, trust, receiver, syndicate, in this and any other county, city and county, city municipality, district or other political subdivision or any other group or combination acting as a unit." Agents may sign this document; however, the legal name and entity of the applicant and property owner must be provided below. 1 . 2. APPLICANT (Not the applicant's agent) Provide the COMPLETE. LEGAL names and addresses of ALL persons having a financial interest in the application. If the applicant includes a corporation or partnership, include the names, title, addresses of all individuals owning more than 10% of the shares. IF NO INDIVIDUALS OWN MORE THAN 10% OF THE SHARES, PLEASE INDICATE NON- APPLICABLE (N/A) IN THE SPACE BELOW If a publiclv^owned corporation, include the names, titles, and addresses of the corporate officers. (A separate page may be attached if necessary.) Person y Title X Corp/PartX Title AddressAddress Y OWNER (Not the owner's agent) Provide the COMPLETE. LEGAL names and addresses of ALL persons having any ownership interest in the property involved. Also, provide the nature of the legal ownership (i.e, partnership, tenants in common, non-profit, corporation, etc.). If the ownership includes a corporation or partnership, include the names, title, addresses of all individuals owning more than 10% of the shares. IF NO INDIVIDUALS OWN MORE THAN 10% OF THE SHARES, PLEASE INDICATE NON-APPLICABLE (N/A) IN THE SPACE BELOW. If a publicly- owned corporation, include the names, titles, and addresses of the corporate officers. (A separate page may be attached if necessary.) Person v*Title K A ^Address L Corp/Part. /4 Title Address //£// A 1635 Faraday Avenue • Carlsbad, CA 92008-7314 • (76O) 6O2-460O • FAX (760) 602-8559 3. NON-PROFIT OHr.*NTZATION OR TRUST If any person identified pursuant to (1) or (2) above is a nonprofit organization or a trust, list the names and addresses of ANY person serving as an officer or director of the non-profit organization or as trustee or beneficiary of the. Non ProftdTrustS IXMlU^Mi M'•- (h*s&$^on Profit/Trust Title ^T/UlM/?£. Title Address -Ayp* V Mfr^gf^^X./v Address 4. Have you had more than $250 worth of business transacted with any member of City staff, Boards, Commissions, Committees and/or Council within the past twelve (12) months? Yes I I No If yes, please indicate person(s):. NOTE: Attach additional sheets if necessary. I certify that all the above information is true and correct to the best of my knowledge. Signature of ownmoate^ Signature of applicant/date ' \ i ' i Is i iI/O ilU^fio HJ- \S cix* ^TX TVurg A O. Print or type name of owner Print or type name of applicant Signature of owner/applicant's agent if applicable/date X. Print or type name of owner/applicant's agent H:ADMIN\COUNTER\DISCLOSURE STATEMENT 5/98 Page 2 of 2 BACKGROUND DATA SHEET CASE NO: CDP 00-65 CASE NAME: Clements Residence APPLICANT: Robert Soto REQUEST AND LOCATION: 824 square foot second story addition to an existing single family residence at 5021 Tierra Del Pro Street. LEGAL DESCRIPTION: Lot 13 of Tierra Del Pro Subdivision according to Map thereof No. 3052, filed in the Office of the County Recorder of San Diego County, February 4, 1954. APN: 210-020-13-00 Acres: .32 (14.100 sq/ft) Proposed No. of Lots/Units: 1 GENERAL PLAN AND ZONING Land Use Designation: RLM/OS (Residential Low-Medium/Open Space) Density Allowed: 0-4 du/acre Density Proposed: One unit Existing Zone: R-l Proposed Zone: N/A Surrounding Zoning, General Plan and Land Use: Zoning General Plan Current Land Use Site North South East West R-l R-l R-l R-l N/A RLM/OS RLM/OS RLM/OS RLM/OS N/A Single Family Res Single Family Res. Single Family Res. Single Family Res. Pacific Ocean PUBLIC FACILITIES School District: Carlsbad Water District: Carlsbad Sewer District: Carlsbad Equivalent Dwelling Units (Sewer Capacity): One ENVIRONMENTAL IMPACT ASSESSMENT Negative Declaration, issued Certified Environmental Impact Report, dated_ Other, Exempt Sections 15301 CITY OF CARLSBAD GROWTH MANAGEMENT PROGRAM LOCAL FACILITIES IMPACTS ASSESSMENT FORM (To be Submitted with Development Application) PROJECT IDENTITY AND IMPACT ASSESSMENT: FILE NAME AND NO.CDP 00-65 - Clements Residence LOCAL FACILITY MANAGEMENT ZONE: 3 GENERAL PLAN: RLM/OS ZONING: RJ DEVELOPER'S NAME: Robert Soto ADDRESS: 1611A South Melrose Drive. Vista, CA 92083 PHONE NO.: 760-630-1434 ASSESSOR'S PARCEL NO.: 210-020-13-00 QUANTITY OF LAND USE/DEVELOPMENT (AC., SQ. FT., DU): .32 acres. 14.100 sq/ft. 1 unit ESTIMATED COMPLETION DATE: September 2001 A. B. C. D. E. City Administrative Facilities: Library: Demand in Square Footage = 3.4767 Demand in Square Footage = 1.854 F. G. H. I. J. K. Wastewater Treatment Capacity (Calculate with J. Sewer) Park: Demand in Acreage = Drainage: Demand in CFS = Identify Drainage Basin = (Identify master plan facilities on site plan) Circulation: Demand in ADT = (Identify Trip Distribution on site plan) Fire: Served by Fire Station No. = Open Space: Acreage Provided = 1EDU .006953 N/A B 10 = 1 N/A Schools: Carlsbad Unified School District Elm=.261. JHS=. 072. HS=. 136 Total=469 (Demands to be determined by staff) Sewer: Demands in EDU 1 EDU (Identify trunk line(s) impacted on site plan) Water: Demand in GPD = 220 ^X^ If &K Eiif/iiiccrinl liic I I I I I I I I I I I I I I CIVIL, GEOTECHNICAL, » QUALITY ENGINEERING FOUNDATION DESIGN • LAND SURVEYING • SOIL TESTING CONSTRUCTION MANAGEMENT » INSPECTION erosion control device consisting of large boulders stacked at approximately 30 feet wide by 10 feet high. The purpose of this jetty is for the protection of the westerly • facing slopes on this lot and adjacent properties against erosion caused by ocean wave action. I FIELD AND LABORATORY TESTING On 15 February 2001, a Field Investigation was performed at the subject site. This investigation consisted of the excavation of two test pits dug with a hand drill auger. Locations of these test holes are shown on the Plot Plan, Enclosure (1) and the detailed Logs of these Test Pits are presented on Enclosure (2). As the test pits were advanced, the soils were visually classified by the Field Engineer. Undisturbed and bulk samples, as well as in-place density tests, were obtained at various depths representative of the different soils horizons. All samples were returned to our laboratory for detailed testing. Results of the in-place compaction tests, the Maximum Dry Density Test values for the various soils sampled and the Expansion Potential Test results are presented on Enclosure (3). These materials were also tested for Shearing Strength, Enclosure (4). • Shear tests were made with a direct shear machine of the strain control type in which the rate of strain is 0.05 inches perminute. The machine is so designed that tests may be performed ensuring a minimum of disturbance from the field conditions. Saturated, remolded specimens were subjected to shear under various normal loads. Expansion tests were performed on typical specimens of natural • soils. These tests were performed in accordance with the procedures outlined in the Uniform Building Code. SOIL CONDITIONS As indicated by our Test Pit Logs, Enclosure (2), the westerly side of the house pad is underlain with approximately 4 feet of fill materials consisting of dry to damp, loose to dense, brown silty sands. Underlying the fill materials and exposed on the westerly slope face are Terrace Deposit materials consisting of damp, moderately well cemented, massively bedded, silty fine to medium sands. 2 1611-A SO. MELROSE DRIVE #285, VISTA, CA 92083-5497 • 760-945-3150 • FAX: 760-945-4221 I I I CIVIL. GEOTECHN/CAL. i QUALITY ENGINEERING FOUNDATION DESIGN • LAND SURVEYING • SOIL TESTING CONSTRUCTION MANAGEMENT t INSPECTION 11 iug, Inc. I I 1 1 GEOLOGIC HAZARDS According to published information, there are no known active or potentially active faults on or in the immediate vicinity of the subject site. Therefore, the potential for ground rupture at this site is considered low. There are, however, several faults located within a close proximity to this site that the movement associated with them could cause significant ground motion. The following table presents the distance of major faults from the site, the assumed maximum credible earthquake magnitudes and estimated peak accelerations anticipated at the site. The probability of such an earthquake occurring during the lifetime of this project is considered low. The severity of ground motion is not anticipated to be any greater at this site than in other areas of San Diego County. SEISMICITY OF MAJOR FAULTS | MAXIMUM CREDIBLE ESTIMATED * FAULT DISTANCE MAGNITUDE(RICHTER) ACCELERATION(g) | Rose Canyon 4 mi. 7.0 0.25 Elsinore 29 mi. 7.5 0.35 | SanJacinto 52 mi. 7.8 0.17 " San Andreas 76 mi. 8.3 0.12 | The following information is presented relative to the subject site and Seismic Zone 4 per the U.B.C.: * SEISMIC PROFILE UBC TABLE 1 (z) Seismic zone factor = 0.4 16 A-I (Na) Near-source factor = 1.0 16A-S | (A) Seismic source type = A 16A-U * (Sd) Soil profile type = Sd 16A-J R (Ca) Seismic coefficient = 0.44 Na 16A-Q (Cv) Seismic coefficient = 0.64 Nv 16A-R (Nv) Near-source factor =1.2 16 A-T I 3 I 1611-A SO. MELROSE DRIVE #285, VISTA, CA 92083-5497 • 760-945-3150 • FAX: 760-945-4221 I 1 I 1 I I I fftiffiiiccrififf, flic. CIVIL. GEOTECHNICAL. A QUALITY ENGINEERING FOUNDATION DESIGN • LAND SURVEYING • SOIL TESTING CONSTRUCTION MANAGEMENT t INSPECTION LIQUEFACTION POTENTIAL Liquefaction analysis of the soils underlying the site was based on the consideration of various factors which include the water level, soil type gradation, relative density, intensity of ground shaking and duration of shaking. Liquefaction potential has been found to be the greatest where the ground water level is shallow and loose fine sands occur within a depth of 50 feet or less. These conditions are not present within the site area and, therefore, the potential for generalized liquefaction in the event of a strong to moderate earthquake on nearby faults is considered to be low. STABILITY The relatively dense nature of the slopes within the site and the nature of the material underlying the site generally preclude the occurrence of major landslide conditions. The area surrounding the site is not known to be within an area of ground subsidence. The potential for deep seated slope failure at the subject site is considered low. The site surface materials consist of silty sands that are relatively dense in their dry state. These materials are susceptible to erosion. Drainage control is essential to maintain the stability of any planned slopes or slope areas. " FLOODING i Flooding is not expected to present a hazard to the existing or proposed development, assuming that structures are constructed above the design historical 1 flood elevations. . TSUNAMIS I Tsunamis are large sea waves generated by a submarine earthquake or 1 volcanic eruption. The highest waves historically to affect the San Diego coastal area has been slightly in excess of 6 feet. There is a possibility that the site could be • subject to tsunami related hazards in an offshore seismic event. I 4 I 1611-A SO. MELROSE DRIVE #285, VISTA, CA 92083-5497 • 760-945-3150 • FAX: 760-945-4221 I I I I I I I 1 I I I 1 JKiffjfficcriiiij, flic. CIVIL. GEOTECHNICAL, t QUALITY ENGINEERING FOUNDATION DESIGN • LAND SURVEYING • SOIL TESTING CONSTRUCTION MANAGEMENT t INSPECTION CONCLUSIONS AND RECOMMENDATIONS Based on field data and our laboratory tests results, the following Conclusions and Recommendations are presented and are to be utilized in conjunction with the Building Plans. Based on the present site conditions, it is concluded that the long term recession of the westerly slope has been significantly reduced by the installation of the sea-wall jetty. It is further concluded that if the sea-wall jetty is properly maintained throughout the life of the project, the residence should have a usable life span of at least 75 years. I, On the basis of our investigation, development of the site as proposed is * considered feasible from a soils engineering standpoint provided that the _ recommendations stated herein are incorporated in the design of foundation systems |! and are implemented in the field. The main consideration in developing the subject site is the presence of loose to dense fill materials subject to possible creep. The thickness of these materials is approximately 2 to 4 feet below the existing surface. These materials are considered unsuitable in their present condition for the support of the proposed second story addition to the existing structure. In order to help mitigate this potentially adverse condition we recommend that the proposed foundation system shall be embedded into the underlying terrace deposit soils. Foundations shall be sized and constructed in accordance with the Structural Engineer's design, based on the earth pressures and the allowable bearing values listed below, along with the expected live and dead loads, and the projected wind and seismic loads. 1 All structural fill shall be compacted to at least 90% of the maximum dry density at near optimum moisture content as determined "in accordance with ASTM Test Procedure D 1557-91 or equivalent.I I I 5 |! 1611-A SO. MELROSE DRIVE #285, VISTA, CA 92083-5497 • 760-945-3150 • FAX: 760-945-4221 Site drainage should be dispersed by non-erodible devices in a manner to preclude concentrated runoff over graded and natural areas in accordance with the City of Carlsbad requirements.