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HomeMy WebLinkAboutA. Case No. MISC 09-299, Francisco J. Urrutia CITY OF PALM DESERT DEPARTMENT OF COMMUNITY DEVELOPMENT STAFF REPORT REQUEST: Approval to lower an existing pad for a portion of the property to allow for a garage and entry motor courtyard located in the Canyon View Estates at Ironwood Country Club at 49-825 Desert Vista. SUBMITTED BY: Kevin Swartz Assistant Planner APPLICANT: Francisco J. Urrutia 165 Luring Drive Palm Springs, CA 92262 CASE NO. Misc 09-299 DATE: July 21, 2009 I. EXECUTIVE SUMMARY: Approval of staff's recommendation would allow the applicant to lower an existing pad from an elevation of 593.00 ft. to an elevation of 588.50 ft. in the front of the lot for a portion of a proposed home for the garage and entry motor courtyard. II. BACKGROUND/ DISCUSSION: Tentative Tract Map 29713 was approved through City Council Resolution 02- 134 in October 2002. The tentative map established pad elevations for 52 residential lots in Canyon View Estates at Ironwood Country Club. In 2003, Tetra Tech Engineering submitted rough grading plans and a hydrology study to the Public Works Department for review and approval. The hydrology study that was submitted ascertained that the approved lot elevations did not adequately protect the lots from flooding. The pad elevations on the rough grading plans submitted raised the pad elevations significantly from the approved tentative map elevations. The rough grading plans were approved by the City Engineer in December 2003. The City Engineer has requested that the applicant's engineer certify that the new lower pad height will not adversely be impacted and will provide adequate protection from flooding. The hydrology study back in 2003 indicated that the Staff Report Misc 09-299 July 21, 2009 Page 2 of 3 rough grading pad heights for the entire tract have been raised from the approved pad heights shown on the tentative map. The report showed that the lower pad heights shown in the tentative map did not provide adequate protection from flooding. The applicant's engineer has submitted a written letter and certifies that the new lower pad height does provide adequate protection from flooding. The proposed Schlosser Residence is located on Lot 38 of Tract Map 29713. The approved rough grading pad elevation for this lot is at 593.00 ft. The pad elevation of the main part of the house agrees with this elevation. Several wings of the house have a proposed pad elevation that is 4'-6" lower. Municipal Code 26.24.220 states that the "grade elevation shall not vary more than six inches plus or minus that shown on the approved tentative map." In this case, the approved rough grading plan elevations are the standard to which all single family pad elevations are held for this tract. The applicant's engineer certifies that the new lower pad height does provide adequate protection from flooding. The change in pad height would not adversely impact the neighboring properties, including their drainage patterns or view lines. In order for the applicant to lower the pad more or less than six inches, the Planning Commission must review the approved and proposed pad elevations and make a decision whether to allow the change. III. CONCLUSION: In conclusion, staff believes by lowering the existing pad elevation for a portion of the proposed home for the garage and entry motor courtyard will not be considered detrimental to the existing pad or surrounding area. The applicant's engineer certifies that the new lower pad height does provide adequate protection from flooding, based upon the letter submitted. IV. RECOMMENDATION: Staff recommends that the Planning Commission adopt Resolution No. approving Misc 09-299, subject to the attached conditions. G:\Planning\Kevin Swartz\Word\Canyon View Estates Pad Height\Staff Report pc.doc Staff Report Misc 09-299 July 21, 2009 Page 3 of 3 V. ATTACHMENTS: A. Draft Resolution B. Legal notice C. Exhibits: Residential site plan, elevations, and grading plans by Francisco J. Urrutia Architect, dated 6 July 2009 D. Letter submitted by Ron Fiero, PE, dated 16 July 2009 Submitted by: Department Head: Kevin Swartz Lauri Aylaian Assistant Planner Director of Community Development G:\Planning\Kevin Swartz\Word\Canyon View Estates Pad Height\Staff Report pc.doc PLANNING COMMISSION RESOLUTION NO. A RESOLUTION OF THE PLANNING COMMISSION OF THE CITY OF PALM DESERT, CALIFORNIA, APPROVING TO LOWER AN EXISTING PAD FOR A PORTION OF THE PROPERTY TO ALLOW FOR A GARAGE AND ENTRY MOTOR COURTYARD LOCATED IN THE CANYON VIEW ESTATES AT IRONWOOD COUNTRY CLUB AT 49-825 DESERT VISTA. CASE NO. MISC 09-299 WHEREAS, the Planning Commission of the City of Palm Desert, California, did on the 21st day of July, 2009, hold a duly noticed public hearing to consider the request by Francisco J. Urrutia for approval of the above noted; and WHEREAS, said application has complied with the requirements of the "City of Palm Desert Procedure for Implementation of the California Environmental Quality Act", Resolution No. 06-78 in that the Director of Community Development has determined that the project is a Class 3 Categorical Exemption; and WHEREAS, at said public hearing, upon hearing and considering all testimony and arguments, if any, of all interested persons desiring to be heard, said Planning Commission did find the following facts and reasons to exist to justify approval of the said request: NOW, THEREFORE, BE IT RESOLVED by the Planning Commission of the City of Palm Desert, California, as follows: 1. That the above recitations are true and correct and constitute the approval of the Commission in this case. 2. That approval of MISC 09-299 is hereby granted, subject to conditions attached. PASSED, APPROVED AND ADOPTED at a regular meeting of the Palm Desert Planning Commission, held on this 21st day of July, 2009, by the following vote, to wit: AYES: NOES: ABSENT: ABSTAIN: VAN G. TANNER, Chairperson ATTEST: LAURI AYLAIAN, Secretary Palm Desert Planning Commission PLANNING COMMISSION RESOLUTION NO. CONDITIONS OF APPROVAL CASE NO. MISC 09-299 DEPARTMENT OF COMMUNITY DEVELOPMENT: 1. The development of the property shall conform substantially with exhibits on file with the Department of Community Development/Planning, as modified by the following conditions. 2. Prior to issuance of a building permit for construction of any use contemplated by this approval, the applicant shall first obtain permits and/or clearance from the following agencies: Building and Safety Department Public Works Department Evidence of said permit or clearance from the above agencies shall be presented to the Department of Building and Safety at the time of issuance of a building permit for the use contemplated herewith. 3. Any proposed change of this approval will require an amendment, which will result in a new public hearing. 2 CITY Of P11 [ 111 DESERT 73-510 FRED WARING DRIVE • " PALM DESERT,CALIFORNIA 92260-2578 M r y• TEL:760 346-0611 .4., • FAX:760 341-7098 .... •-i•r=. info@palm-dcscrt.org CITY OF PALM DESERT LEGAL NOTICE CASE NO. MISC 09-299 NOTICE IS HEREBY GIVEN that a public hearing will be held before the Palm Desert Planning Commission to consider a request by Francisco J. Urrutia for approval of a change to an existing pad elevation. The property is located at 49835 Desert Vista Drive. IIIIIIIIIR 111110110 m, t. • 111 v' f'--- ,A, ,.. v'. Z�, Z' t, Oa 'P 4, �, ,.R$" i?R�J. ,, 2, ,,,�3m `"a' '.. ,, :a; � .0a fir., VIV '� YZP2' SAID public hearing will be held on Tuesday, July 21, 2009 at 6:00 p.m. in the Council Chamber at the Palm Desert Civic Center, 73-510 Fred Waring Drive, Palm Desert, California, at which time and place all interested persons are invited to attend and be heard. Written comments concerning all items covered by this public hearing notice shall be accepted up to the date of the hearing. Information concerning the proposed project is available for review in the Department of Community Development at the above address between the hours of 8:00 a.m. and 5:00 p.m. Monday through Friday. If you challenge the proposed actions in court, you may be limited to raising only those issues you or someone else raised at the public hearing described in this notice, or in written correspondence delivered to the Planning Commission at, or prior to,the public hearing. PUBLISH: Desert Sun LAURI AYLAIAN, Secretary July 11, 2009 Palm Desert Planning Commission P.O.Box 12980 Palm Desert,CA 92255 (760)346 8015 [0:11 (760)346-2548 Fax www.feiro.net FEIRO ENGINEERING, inc. July 16,2009 City of Palm Desert 73-510 Fred Waring Drive Palm Desert,CA 92260 Attn:Lauri Aylaian,Planning Director RE: Lot 38,Desert Vista Drive,Ironwood(Schlosser Residence) Dear Ms.Aylaian, Per my conversation with Kevin Swartz this morning,below is my analysis and opinion regarding the lowering of a portion of the pad on the above referenced property. I have reviewed the Hydrology Studies prepared by SR Consultants and Tetra Tech for Tract 29713 (Canyon View Estates). Attached Exhibit"A"indicates the tributary area to Lot 38,as well as the 10-year and 100- year flow rates in Desert Vista Drive at the southerly property line. This exhibit is a portion of the overall Hydrology Map included with the Hydrology Study by Tetra Tech. It indicates a predicted maximum 100- year flow rate of 6.7 CFS. Exhibit"B",also a part of the Tetra Tech Hydrology Study,indicates the street capacity calculation for the streets within Canyon View Estates. A field survey by our company has revealed the street slope along Lot 38 frontage to be 1.8%.Using the curb capacity exhibit,I determined the maximum flow rate that can be contained within the street section(including 5'back of curb)to be 13.0 CFS. It is apparent that Desert View Drive can contain the 100-year flow rate at Lot 38 with a safety factor of 100%. Exhibit"C"is a cross section I prepared showing the proposed section at the lowest point of the garage (presumably the lowest point at which stormwater could enter the residence). The finish floor elevation at the garage door is 1.30 feet higher than the elevation 5'back of curb. In other words,even if a storm produced enough runoff in Desert View Drive that the street was flowing at full-capacity,the lowest point on the proposed garage would still be 1.30 feet higher. It is not predicted that a 100-year storm would even reach the elevation of the top of curb. It is my opinion that lowering the pad elevation as proposed still provides adequate protection from flooding. QRpFESS/ t,,0 �, Ronald K. Feiro �Q. +p O K. 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( rii \*,-4 'aig'11di' � sfi:1 (,: tt $1.\\1\kl \� spifit .. ... ,..\....-qi \\ *Id ' ll - �1r `Y . .. r`' ,�intita��!"14 ". , , k,,, tci 1 ---,\ t, PPt-614).'.-- ,"1 -11...iii;;Tflifitri ' * 1 kik 011111WARP VIC);:;44,1 0,, imp.-'4 1111 iii; \4 7 44101, ..... malim...:.1*\\I if foni,..,,,,,ittil, ti i ta PAN c) ' ' \,,. till.h- .1111,111 An'' (((' 1 11:; . \h, Aligi ....411.71.•_, ar- �''>4 \ c 2 /74\\.-All 'v t* I. N'Ww1"4"..„."7.4ir-C-14 , ., ::,,• iir\'`NrA ~i1 1t 1 ,+� ems.+ ,�, fr l 1 i i I. INTRODUCTION t ! The purpose of this report is to present an analysis of the 10-year and 100-year storm water i discharge to the proposed Ironwood Country Club Development(Tract No.29713) located in the city of Palm Desert, California.The proposed development will consist of 52 home sites. Drainage improvements will consist of open channels, storm drains and culverts to convey j incident storm water from the Santa Rosa Mountains west of the site through the site and to convey onsite drainage to natural discharge points.The purpose of this report is to: 1 • Analyze storm runoff from 10-year and 100-year storm events. • Propose drainage improvements to convey runoff from and through the developed site. II. METHODOLOGY 1 Drainage areas and concentration points are shown on the hydrology map included in this report. The storm water that passes through the site and the onsite storm water that is 1 collected is discharged to the existing golf course and all storm water ultimately flows to storm drain facilities. The peak storm flow discharge rates for the tributary drainage sub-areas were calculated with j integrated rational method/unit hydrograph method hydrology software available from ' Advanced Engineering Software(AES),Version 2001,based on the Riverside County Flood Control and Water Conservation District's(RCFC&WCD)Hydrology Manual. The software I was used to analyze the peak discharges generated by a 10-year and 100-year frequency 1 storms. The Technical Appendix contains a hydrology map of the site and shows the sub- basins and concentration points. 1 There is no soil group classified for the project area so type `D' soil classification was used. Rainfall intensity values were developed from the slope of the intensity duration curves the 11 1 RCFCD Hydrology Manual figure D-4.6. Storm drain pipe hydraulic calculations to size i drainage structures were done using the AES software. Catch basins were located initially to prevent street cross flow and to provide an outlet to existing drainage facilities. Final storm drain design and analysis will be submitted with the street plans. III. STREET FLOW p Depth of flow in the streets is required to remain below the top of curb in a 10-year storm, and within the right-of-way during a 100-year storm(5.0' back of curb at 2% slope). Street flow depths were analyzed using the typical street cross-section with the AES software for a 100-year storm. Locations of catch basins are shown on the hydrology map. Multiple catch basins will be used to in place of long catch basins to reduce the street flow to meet the RCFCD requirement that the 100-year storm remain within the right-of-way. .iExhibit B - 2 Street Capacity Design __ -- _ ----c, 7 .4 1 "i CAPACITY i 37' / / 0. 5 ' 1 8 / / 1 8 ; /1 0 05 A 1, / , ___.- , ---......,_____,..........„— ---------..._ 1LL ., Crown Capacity 15' 0, 7 2 ' 1-0.02' 0.30 NE 11 1 , 0.50' -----1.— MUM 2/3 1/2 • Q = 1 . 486,/n*A*f? *s , i A = 3. 11 SF. W. P. = 17. 51 Ft . 1 R — 0. 18 FT. n = 0. 015 1 , , Q = 96. 8 S1/2 S (ft/ft) 0.5% 1 .0% 1 .5% 2.0% 3.0% 4.0% 5. 0% I Q (c. f.s.) 5.8 9. 7 1 1 .9 , 1 3. 7 1 6.8 19.4 21 6 Exhibit B . , - Street Capacity Calculation — - , ,i o W% o N g4- o o aa L. ai ooh03W cy � �o o 'co c, 0 m � � g C4 01 o v o Psi, C4 ao � � w -g® E E ` 'Th ° O a © U o W r v,^J ; z iw O i I. : L Jaoo 1z1 d m 44 m Iki 1� • • 0 a. W F. a. nj ch —o Vic] 96 ££:£ 600Z/96/L '-i 6 i,x9.8 `bmp.i3Od6£n0I,\6mp\JassoluaS COO OlAspafoad\peaopnevd