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Home My WebLink About2158 TWAIN AVE; ; CB022625; PermitCity of Carlsbad .,. , ,;, 1635 Faraday Av Carlsbad, CA 92008 10-18-2,002 Retaining Wall Permit Permit No: CB022625 Building Inspection Request Line (760) 602-2725 Job Address: Permit Type: Parcel No: 2158 TWAIN AV CBAD RETAIN Lot #: 65 Valuation: 2081802400 $6,899.00 CT97-16 Construction Type: NEW Reference #: Project Title: 438 SF RETAINING WALL Applicant: THE JASPER COMPANIES 2970 GRACE LN COSTA MESA, CA 92626 714-546-5730 Total Fees: $127.37 Building Permit Add'I Building Permit Fee Plan Check Add'I Plan Check Fee Strong Motion Fee Renewal Fee Add'I Renewal Fee Other Building Fee Additional Fees TOTAL PERMIT FEES Owner: Total Payments To Date: $0.00 FINAL APPROVAL Inspector: Date: Status: Applied: Entered By: Plan Approved: Issued: Plan Check#: Inspect Area: APPROVED 09/04/2002 SB 10/18/2002 PC020036 9145 10/18/02 0002 01. Balance Due: $76.59 $0.00 $49.78 $0.00 $1.00 $0.00 $0.00 $0.00 $0.00 $127.37 Clearance: CGp $127.37 E that ap o I of your project includes the 'Imposition' of fees, dedications, reservations, or other exactions hereafter collectively referred to as 'lees/exaction ." You hav O days from the date this permit was issued to protest imposition of these fees/exactions. If you protest them, you must follow the protest procedures set forth in Government Code Section 66020(a), and file the protest and any other required information with the City Manager for processing in accordance with Carlsbad Municipal Code Section 3.32.030. Failure to timely follow that procedure will bar any subsequent legal action to attack, review, set aside, void, or annul their imposition. You are hereby FURTHER NOTIFIED that your right to protest the specified fees/exactions DOES NOT APPLY to water and sewer connection fees and capacity changes, nor planning, zoning, grading or other similar application processing or service fees in connection with this project. NOR DOES IT APPLY to any i hi • ·v n N Tl imil r whi h • I 02 127-37 City of Carlsbad Bldg Inspection Request Permit# CB022625 Title: 438 SF RETAINING WALL Description: 222 CITY SPECS For: 03/06/2003 Type: RETAIN Sub Type: Job Address: 2158 TWAIN AV Suite: Lot 65 Location: APPLICANT THE JASPER COMPANIES Owner: SHEA HOMES LIMITED PARTNERSHIP Remarks: Total Time: CD Description Inspector Assignment: JM --- Phone: 7609120595 Inspector: ~ Requested By: DON Entered By: CHRISTINE 69 Final Masonry Act Com~ _AL_£ .......... ,~-------- Associated PCRs/CVs lnsgection Histoty Date Description Act lnsp Comments 12/27/2002 62 Steel/Bond Beam AP JE WALL DRAINS 12/11/2002 62 SteeVBond Beam WC JM 12/11/2002 66 Grout AP JM OK TO POUR 2ND LIFT 12/04/2002 66 Grout PA JM 1ST LIFT OK TO POUR 11/26/2002 61 Footing AP JM OKTO POUR 11/01/2002 11 Fig/Foundation/Piers CA NA City May 19, 2004 Amy Alder 215 8 Twain A venue Carlsbad CA 92008 of Carlsbad I :.1 Fi ,i,i• ,i· I •14 ·El a I; ,14 ,\ I RE: GEOSOILS INC. SLOPE EVALUATION Dear Ms. Alder, After review of the evaluation prepared by Geosoils Inc. and a site visit to observe the slope condition, the Planning Department has determined that some alteration to the slope is acceptable. A horizontal distance of approximately 30 feet, beginning approximately 12 feet south of the north property line and moving in a southerly direction, may be lowered by no more than three feet to equal the topography as it currently exists on the southern half of the property. The fence must be replaced on the newly stabilized slope top at approximately the same horizontal location as before the slope alteration. Do not move the fence westerly towards the bluff edge. If you should have any questions, please contact me at (760) 602-4614. Sincerely, Christer Westman AICP Senior Planner CW:mh Attachment: Geosoils Inc slope evaluation dated January 9, 2004 1635 Faraday Avenue • Carlsbad, CA 92008-7314 • (760) 602-4600 • FAX (760) 602-8559 • www.ci.carlsbad.ca.us @ Geotechnical • Geologic • Environmental 5741 Palmer Way • Carlsbad, California 92008 • (760) 438-3155 • FAX (760) 931-0915 Ms. Amy Alder 2158 Twain Avenue Carlsbad, California 92008 January 9, 2004 W.O. 4160-A-SC Subject: Limited Geotechnical Review of Slope Areas West of Residence Located at 2158 Twain Avenue, Carlsbad, San Diego County, California Dear Ms. Alder: In accordance with your request, GeoSoils, Inc. (GSI), has observed existing slope conditions with the rear yard of the subject site with respect to overall slope stability and performance. The scope of our review is limited to visual observations made during a site reconnaissance performed on December 19, 2003, engineering analysis, and preparation of this letter report. This report is limited to a visual observation of the existing slope areas west of the residence only, and does not constitute an overall evaluation of the stability of the site, except as discussed herein. The site consists of a residential lot located at 2158 Twain Avenue, in the City of Carlsbad, California. Existing improvements to the property consist of a single-family residential structure. A schematic diagram of rear yard conditions is attached as Figure 1 . An existing retaining wall, approximately 4 to 5 feet in height, is located atthe rear (west) of the building pad. A graded 2: 1 (horizontal to vertical) east facing, rear yard slope ascends from near the top of this wall an additional 7 to 1 O feet to the top of slope. From the top of this slope, a relatively level bench extends approximately 5 to 1 O feet westward, to the top of a west facing, natural slope. This natural slope appears to attain maximum slope gradients ranging to near vertical and appears to descend to the west, below the elevation of the building pad to the east. The east facing rear yard slope is landscaped and irrigated, while the natural slope supports a sparse growth of native vegetation and is not irrigated. Both the rear yard slope and the west facing natural slope are formed in relatively sandy Quaternary-age terrace deposits. Geologic structure within the deposits, generally consists of flat lying to gently west sloping bedding planes. Talus, including loose soil and cobble to boulder size blocks of cemented soil and terrace deposits occurs near the base of the natural slope. Based on our visual observations and overall experience with slopes formed in terrace deposits, the near vertical, natural slope is not likely considered stable, in accordance with current standards of practice. Over time, this westerly slope will weather, degrade and be reduced, due to erosion and mass wasting (i.e., slumping and/or toppling): accordingly, this condition should be anticipated. However, the period of time this occurs over may likely range from years, to perhaps a catastrophic (seismic) occurrence all at once. Based on the available data, the effect of the failure on the subject site is not entirely clear. As the amount of water in soil increases, the soil strength, and slope stability, generally tends to decrease. The observed irrigation of the newly constructed cut slope could potentially accelerate this process of degradation and wasting, as irrigation water enters the subsurface and migrates laterally, along bedding planes, to the existing natural slope, located only a short distance west of the irrigated slope. Given the relative location of the existing residential structure, it does not appear likely that periodic failures within the natural slope area will adversely affect the overall stability of the structure; however, failures could result in the natural slope receding eastward ultimately into the east facing, rear yard slope over time. In general, slope stability decreases with an increase in slope height. Therefore, the overall slope stability, performance and safety, may be enhanced by lowering the height of the slope. Lowering the slope height will also increase the distance between the two slopes, thus reducing the potential for the natural slope to recede into the rear yard slope over the life span of the structure. Irrigation that only provides the amount of water necessary to sustain native droughttolerant plant life will also minimize the potential to introduce excessive amounts of water into the subsoil. The homeowners association responsible for maintenance in this area should be made aware of site conditions due to the potential for injury from falling debris to anyone hiking and/or working at the bottom of the natural slope. As previously stated, lowering the slope height will improve this condition. The conclusions and recommendations presented herein are professional opinions. These opinions have been derived in accordance with current standards of practice and no warranty is expressed or implied. Standards of practice are subject to change with time. GSI assumes no responsibility for work, testing or recommendations performed or provided by others. Ms. Amy Alder 2158 Twain Ave., Carlsbad File:e:\wp9\4100\4160a.lgr GeoSoils, Inc. W.O. 4160-A-SC January 9, 2004 Page2 We appreciate the opportunity to be of further service. If you should have any questions, please do not hesitate to call our office. RGC/JPF/DWS/jh Attachment: Figure 1 -Schematic Diagram Distribution: (4) Addressee Ms. Amy Alder 2158 Twain Ave., Carlsbad File:e:\wp9\4100\4160a.lgr GeoSoils, Ine. Reviewed by: W.O. 4160-A-SC January 9, 2004 Page 3 Hi Christer, Here are the drawings from our landscaper as to the hill revision. Just a couple of notes as to our conversation on Monday: -The reason we would need to put the observation deck on the right side is that there is a larger bench at the top and the slope is not as steep which enables us to build steps to the deck. -Even if we didn't build an observation deck, based on the geotech's counsel, we would still be pursuing the same course of action to stabalize the hill so that we could walk up to the top and maintain landscaping. Please let me know if you need anything else. Thanks, Amy Alder (760) 438-4020 -----Original Message ----- From: Mark Leone To: alders@adelphia.net Sent: Wednesday, May 12, 2004 2:28 PM Subject: Plan Revisions (/ ) 0 "C l (t ) tT J - DE S IG NER.. MM l t Le o n e DAT f 05 - I 0-04 f= ► pm , - F' =\ ~ -~ l~u ![ i i, I' Ir- 5 O') rv 1i .G n j= ' jl "" " ~ l: = j l: m Fi ~· I:~ mf 4 ~ b ~ il! : 1 1 bl m r H k tl ::D I ; im : : : ~ • il m l l ! l m l m r ~ l.t r; i I: ii 11 f• )m l bm lm : i tm ; l:m l l:: : I I :n m Im ! ~ lll l l it l l t l! l ! l lm r i:l l l mi l :u m ml l j ~ lll l l 6i m: i pm : mi l m\ ll ! l t ~ lm l l) !!I l l i :t: J : l la : : :: : I ~ I lll l l : :m e Im = 1m l Cl lm r F lm r n: l: : m rt = ~ b Im : In : ! :i m 'l l l " !i : m i l ! J : l 11 ! : t b t im ll l n !m i : :t l " la ~ f 7 ... . . __ I Na t ure De s i g n s -. 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Ca . 76 0 . . 43 8- 4 0 2 0 Gate to Remal Relainmg Wall(+ 6'-01 Remove 3 Tien,: to 4'-0-· Heli;tlt Continuous Conctete Pad To Be Removed· lreeToBe~ Removed :+ Demolition Plan • RemO\fe 4'-0' Horizontal Ths Encs • 00l'1 Gate to Rem,in Utillty(GO$) Utility (Ele<lric) OownSj)oul Mound C...Jll.S!. ~~ Vle·wh~Al9a Planling .:-:???/i))///t/1 :::::::::::::::::::::::::::-:-:-:·.·.•-·.·.·.·.· f!:(i Planting • Aggrega!eP-atio Plonting Sswcut~y Planting Hardscape Plan Rah,g _, liletalni,t;Wal "Wltertalr Sit~ Moond Mulch Path Mound ng GENERAL NOTES 1. VERIFY LOCATION OF ALL UTILITIES PRIOR TO DEMOLITION. PROTECT AND PRESERVE ALL EXITING UTILITIES. NOTIFY DESIGNER OF CONFLICTS BElWEEN EXISTING UTILITIES ANO PROPOSED IMPROVEMENTS. 2. PROTECT ALL PRESERVED AMENITIES, VEGETATION, AND EQUIPMENT, INCLUDING THOSE TO BE RELOCATED OR REINSTALLED. REPLACE OR REPAIR ANY AMENITIES DAMAGED BY CONSTRUCTION OPERATIONS. 3. ALL HARDSCAPE IMPROVEMENTS TO HAVE POSlllVE DRAINAGE AWAY FROM FOUNDATION OF RESIDENCE. NOTIFY DESIGNER OF CONFLICTS IN DRAINAGE PATTERNS . 4. INSTALL EXPANSION AND CONSTRUCTION JOINT MATERIAL AS NECESSARY TO PREVENT CRACKING. 16' ~L....J--..-.1 Scale: 1" = 8'-0" Demolition Plan Hardscaoe Plan 12J North ... (!,) u c:: (!,) '"d Cl) Cl) 'C :, <ajai~ >, > 0 o E < ·"t < c: -c co ·-'J) (!,) 0::: ·-i (") o(I : Cl)..,. C t,--C: O E co oai co Cl) "' ,..._ E-I-,.. (I,) '"d -< ai N 0 l I JHU ,,11~~ iHH it-:~1 ,~hJi ~iH!l :a I bO c:: ·5. V} !'Cl Q) c:: u ,.. bO v, ;:1 ..... 'U ., ~ c:: zo..'.3 I-' PltOJl!CT NUM~ Rl!VISIONS: DeSIONl!Rl --· CHll!CQDI DAT"' 02-16-04 SHEaT NUMUII L-1