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2013, 06-13 Permit App: BLD-2013-1102 Retaining Wall Community Development Department (Staff Use Only) Permit Center 11703 East Sprague Avenue,Suite B-3 PERMIT NUMBER: Sp_Cry401"\ Spokane Valley,WA 99206 Tel: (509) 688-0036 PERMIT FEE: Valley Fax: (509)688 0037 pax: (5 9)688-00 anevalleY.orq RESIDENTIAL CONSTRUCTION PERMIT APPLICATION 0 NEW CONSTRUCTION ADDITION/REMODEL 0 ACCESSORY B 0. LDING El DECK 0 OTHER l I SITE ADDRESS: `. \`DC)c C DU -� . S ' r jc Ley �� P\c qc-tqcjG(G ASSESSORS PARCEL NO.: LEGAL DESCRIPTION: BUILDING OWNER NAME: / NAME: \ A.Cti.. M1 A , \.--)G\1 (- \_J'" 0.al ADDRESS: 1[L-D ..;;� E c ( '1 /k-A., • { . �� CITY: X1 r VCA \. -_t TE: ` A ZIP: Ct c. cc, f PHONE: -) „l `''l O [ - 3 1��(4? G _(SEED CONTACT NAME: 7�c( \( \\‘, I C 1(y) j PHONE: .Cts-S-( C" ,. (0 ' F� / / CELL: CONTRACTOR NAME: JCC f-U,',,, 5 / Qc-- \'Q5\ \ _ )(S-k--- INTS ' fQ , MAILING ADDRESS: CITY: ( ; V-.) C)C. `,�'C`,,, STATE: Uj A ZIP: PHONE: 50C-k— CA::._ — \y 13 F'': CELL: CONTRACTOR LICENSE No.: XPIRES: CITY BUSINESS LICENSE NO.: DESCRIBE THE SCOPE WORK I 'ETAIL AND INDICATE USE & PROPOSED USE: ****YO , MUST COMPLETE THE FOLLOWING**** MARK N A IF NOT APPLICABLE Height to Peak: Di -nsions: No.of Stories: Total Habitable Space: Main Floor SQ FT: •per Floor SQ FT: Unfinished Basement SQ Finished Basement SQ FT: FT: Garage SQ FT: Deck/Covered Patio SQ Impervious Surface 30%Slopes on FT: Area: Property: No.of Bedrooms: Construction Type: Heat Source: Sewer or Septic: TOTAL COST OFj'ROJECT: $ DISCLAIMER The permitted ver' s,acknowledges and agrees by their signature that: 1)if this permit is for construction or on a dwelling,the dwelling is/will be served by po;ale water. 2)Ownership of this City of Spokane Valley permit inure to the property owner.3) The signatory is the property owner or has p- mission to represent the property owner in this transaction. 4) All construction is to be done In full compliance with the City of Spokane Vali: Development code. Referenced codes are available for review at the City of Spokane Valley Permit Center. 5) The City of Spokane Va -y permit is not a permit or approval for any violation of federal, state or local laws, codes or ordinances. 6) Plans or additional informatio, may be required to be submitted and subsequently approved before this application can be processed. ��ni Sig, .ture ilk A (,1 ; i kc V A 044,A 4 Date: 67_f ) 13 pdated 1-11-11 Page 1 of 1 http://www.spoka nevalley.org/filestorage/124/938/210/948/1496/Building_Permit_-_Residential_11-11-11.doc • • A I_I. l'IEBr' Materials Testing nical Engineering Testing & Engineering Environmental Services June 4, 2013 Project No. 213-098G kia 2003-iro-z Mr. Bruce Williams 11502 East 20th Avenue Spokane Valley, Washington 99206 Re: Geotechnical Evaluation Proposed Segmental Block Retaining Wall 11502 East 20th Avenue Spokane Valley, Washington Dear Mr. Williams: ALLWEST Testing & Engineering (ALLWEST) has completed the geotechnical evaluation for the proposed segmental block retaining wall at the above-referenced site in Spokane Valley, Washington. The purpose of our services was to formulate recommendations for design to assist you in preparation of plans and specifications for construction. This report summarizes the results of our analyses, opinions, and recommendations. PROJECT DESCRIPTION We understand that the proposed project will consist of constructing a segmental block wall retaining the native soils and/or structural fill. The wall will be located in the rear yard of your property. The purpose of the retaining wall is to create a level area in your rear yard to accommodate recreational vehicle trailer storage. The exposed wall height will range up to approximately 12 feet. The ground surface will be level above and below the wall. A deck extending out from the rear of your house will overlook the trailer storage area and will be approximately 25 feet behind the face of wall once the wall is constructed. You indicated that the walls will be constructed using Anchor Diamond Pro segmental block which has a 7.1-degree setback from vertical. We understand that the retaining wall backfill will consist of native soils and imported structural fill from a nearby site. You mentioned both the native and imported soils consist of coarse sands and gravels. 690 W. Capstone Court• Hayden, ID 83835 • (208) 762-4721 • Fax (208) 762-0942 12928 E. Indiana Avenue #1 • Spokane Valley, WA 99216 • (509) 534-4411 • Fax(509) 534-9326 2127 2nd Avenue N. • Lewiston, ID 83501 • (208) 743-5710 • Fax (208) 743-8270 Geotechnical Evaluation Proposed Segmental Block Retaining Wall 11502 East 20th Avenue Spokane Valley,Washington Project No.213-098G Page 2 GENERAL SOIL CONDITIONS The USDA Natural Resources Conservation Service (NRCS) has mapped the soils on and around the site in the Soil Survey of Spokane County as Urban Land-Spens disturbed complex. The Urban Land-Spens soils are described as very deep, well-drained soils that formed in sandy and gravelly glaciofluvial deposits with minor amounts of loess and volcanic ash in the upper part. The exposed on-site soils appear to be consistent with the soil mapping. The NRCS Soils Map for the site is attached as Figure 2. ANALYSIS AND RECOMMENDATIONS Retaining Wall Data The proposed wall will consist of a reinforced segmental block wall retaining the existing soils and imported structural fill. The exposed wall height will range up to approximately 12 feet. The ground surface will be level above and below the walls. The area behind the retaining wall will be used for recreational vehicle storage. You indicated that the walls will be constructed using Anchor Diamond Pro segmental block which has a 7.1- degree setback from vertical. We analyzed reinforced retaining wall sections having a maximum exposed height of 12 feet. We analyzed the reinforced segmental block retaining wall using 8-inch Anchor Diamond Pro segmental block. Miragrid 3XT synthetic reinforcement was used for our analysis. A surcharge pressure of 250 pounds per square foot (psf)was used in the analysis to account for the traffic loads behind the wall. Based on the exposed soil conditions at the site, we used the following strength parameters for analysis: Unit Weight, Soil Type Angle of Internal Cohesion, pounds pounds per cubic Friction, degrees per square foot foot Foundation 36 0 125 Retained 30 0 120 Backfill 30 0 120 Stability Analysis Using the previously mentioned strength parameters, we performed a global stability analysis of the proposed wall using Bishop's method of slices to calculate the minimum factor of safety. The calculations were performed using XSTABL°software on a personal computer. The software is based on a computer program developed for the Federal Highway Administration by Purdue University. ALLWESTMaterials Testing Testing & Engineering Geotechnical Engineering Environmental Services Geotechnical Evaluation Proposed Segmental Block Retaining Wall 11502 East 20th Avenue Spokane Valley,Washington Project No.213-098G Page 3 We analyzed a segmental block retaining wall with a 12-foot exposed height and a flat ground surface above and below the wall (see Figure 3). This wall and slope configuration is considered to be the most critical relative to global stability. The factor of safety we calculated for this configuration was 1.698. For stability, a minimum factor of safety of 1.5 is typically considered to be adequate. Based on this analysis, it is our opinion that the wall/slope configuration will be stable after construction of the proposed wall provided the recommendations of this report are implemented. Wall Sections To assist us in our analysis and design, we used SRWaII 32TM computer software, which was created by the National Concrete Masonry Association (NCMA) for analyzing segmental retaining walls. We analyzed wall sections under static loading for exposed wall heights of up to 12 feet for the Anchor Diamond Pro block. Based on our analysis, we recommend installation of Miragrid 3XT reinforcement for exposed wall heights greater than 3 feet. Exposed wall heights less than 3 feet do not require the installation of reinforcement layers. Detailed wall cross sections are attached to this report (see Figures 4 through 6). Site Preparation We recommend that all topsoil be excavated and removed from the proposed construction areas. If fill is encountered at the time of construction, all fill should be removed to native, inorganic soil. Following topsoil and/or fill removal the exposed subgrade should consist of undisturbed native sand and gravel. ALLWEST must evaluate the exposed subgrade prior to placement of the leveling pad of crushed gravel. Areas that are loose, soft, or unsuitable for support of the wall should be remediated as recommended at the time of construction. Foundation Preparation We recommend that the lowest course of blocks be installed a minimum depth below grade as measured at the wall face and as shown on the attached wall cross sections drawings. These embedment depths are recommended to provide the necessary bearing capacity for the wall foundations and to resist base sliding. The blocks should be placed on a level pad of compacted crushed gravel. We recommend that the leveling pad be a minimum of 6 inches thick, extend 6 inches out from the face of the wall, and be a minimum of 2 feet wide. We recommend that the crushed gravel leveling pad be placed in one loose lift of 6 to 8 inches and be compacted to a minimum of 95 percent of its modified Proctor maximum dry density as established in accordance with ASTM D 1557. Topsoil extending to depths beyond excavation for the leveling pad should be completely removed before placement of structural fill or the leveling pad. ALLWESTMaterials Testing Testing & Engineering Geotechnical Engineering Environmental Services Geotechnical Evaluation Proposed Segmental Block Retaining Wall 11502 East 20th Avenue Spokane Valley,Washington Project No.213-098G Page 4 Backfill and Fill We recommend that fill be placed within 12 inches of the back of the wall consist of a permeable, free-draining material such as crushed gravel with less than 5 percent by weight passing a No. 200 sieve. This is necessary to reduce the potential for water to build up behind the wall. We recommend that backfill behind the wall in the reinforcement area consist of a coarse, permeable sand or gravel (e.g., 5/8 inch minus —WSDOT Standard Specifications for Road, Bridge, and Municipal Construction 2012, section 9-03.9(3), or similar). We recommend that the backfill be placed in maximum 8-inch loose lifts. The backfill should be moisture conditioned to within 2 percent of the optimum moisture content and compacted to a minimum of 92 percent of its modified Proctor maximum dry density. In the upper two feet, we recommend the retaining wall backfill be compacted to a minimum of 95 percent of its modified Proctor maximum dry density. Hand operated equipment should be used to reduce the potential of imposing excessive lateral stresses on the wall. Retaining Wall Drainage Draintile should be placed at a location just behind the lowest course of blocks to remove water from behind the wall. The draintile should outlet at the lowest points of the wall at least at both ends of the wall. Additional Services Recommended We recommend that ALLWEST Testing & Engineering be retained to provide construction observations and testing to verify the soil and geologic conditions and that the report recommendations are incorporated into the actual construction. Compaction testing should be performed by an experienced engineering technician to verify that the recommended levels of compaction are achieved. If we are not retained to provide the recommended construction observation and testing services, we cannot be responsible for soil engineering related construction errors or omissions, nor can we provide any opinions regarding conformance of the construction to the recommendations of this report. 7 1��--: ere TC J/ �r a/'e 1% ri'✓1'1 �//1FY, k H l pi-L Jc REPORT LIMITATIONS `" 1,1, �C ) pvc 5 This report has been prepared to assist in the design and construction of the proposed retaining wall at 11502 East 20th Avenue in Spokane Valley, Washington. Our services consist of professional opinions and conclusions made in accordance with generally accepted geotechnical engineering principles and practices in our area at the time of this report. This acknowledgement is in lieu of all warranties either expressed or implied. ALLWESTMaterials Testing Testing & Engineering Geotechnical Engineering Environmental Services Geotechnical Evaluation Proposed Segmental Block Retaining Wall 11502 East 20th Avenue Spokane Valley,Washington Project No.213-098G Page 5 REMARKS It has been a pleasure being of service to you on this project. If you have any questions or need additional information, please do not hesitate to call us at (509) 534-4411 at your convenience. Sincerely, ALL /- ST Testi & Engi r e ng, LLC 10EL�l hof 9/4444, 9 CS Cole W. Warrick, P.G. a Jr Project Geologist b �I 42767 yy Andy J. Eliason, P.E. Project Engineer Attachments: Figure 1, Site Location Map Figure 2, NRCS Map Figure 3, Slope Stability Cross Section Figures 4 through 6, Wall Sections ALLWESTMaterials Testing Testing & Engineering Geotechnical Engineering Environmental Services Figure 3 213-0980 6-03-13 16:43 11502 East 20th Avenue 140 _ 10 most critical surfaces, MINIMUM BISHOP FOS = 1 .698 120 _ Ihr" a 100 _ X < 80 _ > 60 _ 40 40 60 80 100 120 140 160 180 200 X—AXIS (feet) Slope Stability Cross Section Created By: AJE Proposed Segmental Block Retaining Wall Project No. 213-098G 11502 East 20th Avenue ALLWEST June 4, 2013 Testing & Engineering Spokane Valley, Washington Figure 1 JL...........-.-..,4 .� �� .. �. . _ji 12711 i�-__.. . z , , _. ,,, r- t_._ *. Fa 1t \o,,_. ' T'w, 4 1 1 i f rte' The Po es L . , 1 „ , .2 1 . .* Ceo-1-7-\\ .. 41. =II ."1..--.... 11.( l! I j4 , i I....:- ;,........... ' [It - -. L ) , , _-_,.... _ ...,,, \ r,7---...... __, . _- Site ---- .. . 5 f — Ste$' _- _ . 44 IL t,,,..-,......,,, -- , --, . -.�.e Tlc � ,:ir_. . , .., w_,,,.. 20,.5 ________, z Weitil i ..,..,,,,.., ,, Fi 2013 rt Site Location Map Created By: AJE Proposed Segmental Block Project No. 213-098G Retaining Wall —� 11502 East 20th Avenue ALLWEST June 4, 2013 Testing ✓3gineing Spokane Valley, Washington Figure 2 • 7122 A Alo mss_ 20th Are Site I I, --:_dit.,,,.,„,*: L: . ' '.. - - 46w 9* 4- 7411.1116111.111 4.1 a 16 $ e 1119 NRCS Map Created By: AJE Proposed Segmental Block Project No. 213-098G Retaining Wall �,,, 11502 East 20th Avenue ALLWEST June 4, 2013 Testing && Engineering Spokane Valley, Washington _ /jtd- 2f -/(O7 - Aerial Map / Site Plan IP • . 1: 11‘:.1).?. ',i ��.�.Rs""' ��yy£ w. al 111 5 ,yam., . ; 45281.1534 , � 4 ° ;. 5aoicAa da ,aQ'37 : poaaaa WQ611,aW 11 ,J t a ' • f,. 45282:2501 1 i _i , i 1 ,q'23' ' I , 1 , 45281.1908 45281.1908 I45281.1909 I 1 59.8 0 29.91 59.8 Feet (31 This map is a user generated static output from an Internet mapping site and is for reference only.Data layers that appear on this map may or may not be accurate,current,or otherwise reliable. ^ter .,.. . _. a 8" X 12" ANCHOR DIAMOND PRO SEGMENTAL DRAINAGE RETAINING WALL BLOCK (TYP.) AGGREGATE (TYP.) 12" MINIMUM WIDTH PARKING AREA 7 .0. 6 L = 7.0' �. 4.0' MAXIMUM 5 �;rm EXPOSED ti. L = 5.5' 4 ►: �� HEIGHTY ��-COMPACTED FILL (TYP.) GROUND SURFACE � Y �►',� L =4.5' • w�0 �� 4" MINIMUM DIAMETER 1:4,50,.:4141^41DRAINTILE ROUTED TO APRROVED DISCHARGE 1 COURSE MINIMUM EMBEDMENT MINIMUM 6" THICK, 24"WIDE CRUSHED, GRAVEL LEVELING PAD COMPACTED TO 95% OF THE MODIFIED PROCTOR NATIVE, UNDISTURBED SANDS, GRAVELS, MAXIMUM DRY DENSITY. OR COMPACTED STRUCTURAL FILL L = LENGTH OF GEOGRID ALL GEOGRID FOR THIS WALL SECTION SHALL BE MIRAGRID 3XT OR EQUIVALENT. TITLE: 0.0' TO 4.0' EXPOSED HEIGHT ALlINEST SEGMENTAL BLOCK WALL SCALE: DATE: PROJECT#: HAYDEN&LEWISTON,IDAHO&SPOKANE,WASHINGTON FIGURE 4 NONE JUNE 4, 2013 213-098G (208)762-4721 (208)743-5710 (509)534-4411 DRAINAGE AGGREGATE (TYP.) 12" MINIMUM WIDTH 8" X 12" ANCHOR DIAMOND PRO SEGMENTAL RETAINING WALL BLOCK(TYP.) PARKING AREA 13. : L = 11.0' ' 12 :! 11 a'' L = 8.0' 8.0' MAXIMUM 10 : ' 5`COMPACTED FILL�� EXPOSED 9 8 (TYP.) HEIGHT s L = 8.0' 6 GROUND SURFACE El:- L = 8.0 L = 8.0' 4" MINIMUM DIAMETER DRAINTILE ROUTED TO APRROVED DISCHARGE MINIMUM 6" THICK, 24"WIDE CRUSHED, 2 COURSE MINIMUM GRAVEL LEVELING PAD COMPACTED EMBEDMENT TO 95% OF THE MODIFIED PROCTOR MAXIMUM DRY DENSITY. NATIVE, UNDISTURBED SANDS, GRAVELS, OR COMPACTED STRUCTURAL FILL L = LENGTH OF GEOGRID ALL GEOGRID FOR THIS WALL SECTION SHALL BE MIRAGRID 3XT OR EQUIVALENT. TITLE: 4.0' TO 8.0' EXPOSED HEIGHT ALLWEBT SEGMENTAL BLOCK WALL SCALE: DATE: PROJECT#: HAYDEN&LEWISTON,IDAHO&SPOKANE,WASHINGTON FIGURE 5 NONE JUNE 4, 2013 213-098G (208)762-4721 (208)743-5710 (509)534-4411 • DRAINAGE 8" X 12" ANCHOR DIAMOND PRO SEGMENTAL AGGREGATE (TYP.) RETAINING WALL BLOCK(TYP.) 12" MINIMUM WIDTH PARKING AREA ' 20 19 .f. L=13.5' 16' L=10.0' 15-: 14 1_t L=9.5' 12.0' MAXIMUM 12 5---COMPACTED FILLER. EXPOSED 11 (TYP.) L=9.5' HEIGHT 10 8 t L=9.5' 7 �Z 6 5 V L=9.5' GROUND SURFACE 3 � 2 • L=9.5' 1:17 kiimum DIAMETER • r ' O,' 01TD3g2l�# ffi O DISCHARGEPRROVED 2 COURSE MINIMUM EMBEDMENT MINIMUM 6" THICK, 24" WIDE CRUSHED, GRAVEL LEVELING PAD COMPACTED TO 95% OF THE MODIFIED PROCTOR NATIVE, UNDISTURBED SANDS, GRAVELS, MAXIMUM DRY DENSITY. OR COMPACTED STRUCTURAL FILL L = LENGTH OF GEOGRID ALL GEOGRID FOR THIS WALL SECTION SHALL BE MIRAGRID 3XT OR EQUIVALENT. TITLE: 8.0' TO 12:0' EXPOSED HEIGHT SEGMENTAL BLOCK WALL ALLINEST SCALE: DATE: PROJECT#: HAYDEN&LEWISTON,IDAHO&SPOKANE,WASHINGTON FIGURE 6 NONE JUNE 4, 2013 213-098G (208)762-4721 (208)743-5710 (509)534-4411 THESE PLANS M L'ST BE KEPT ON THE JOB SITE' THIS BUILDING SEJBJ r T TO FIELD INSPECTION CORRECTIONS .000Valley REVIEWED FOR CODE COMPLIANCE SPOKANE VALLEY BUILDING DIVISION izJ �' � i