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2006, 04-18 Permit App: 06001308 Retaining Wall Project Number: 06001308 Inv: 1 Application Date: 4/18/2006 Page 1 of 2 THIS IS NOT A PERMIT Penalties will be assessed for commencing work without a permit Project Information: "",-eft* vw:rv5w«A '¢ YYsn.:wrc6.".n'.riot'rohIXsJM:aT'. t'w'"�D'utuiR[e eF,AdiN.wfl:d w+'dwm+ % A 'm ;""""!a,..�.,m:Ss:reo u^M f3",+,.:!+e£T.aa nntv'P a&aaeT`A;k' Permit Use: Retaining wall Contact: NORRIS,GREG&HUEBSCHMAN,LAU Address: 2424 N COLEMAN RD C-S-Z: SPOKANE VALLEY,WA 99212 Setbacks:Front Left: Right: Rear: Phone: (509)954-8900 Group Name: Site Information: Project Name: Plat Key: Name: SHP-02-04 District: Sout Parcel Number: 45281.2703 Block: Lot: 3 SiteAddress: 11609 E 20TH AVE Owner:Name: NORRIS,GREG&HUEBSCHMAN Address: 2424 N COLEMAN RD Location::CSV SPOKANE VALLEY,WA 99212 Zoning: UR-3.5 Urban Residential 3.5 Water District: Hold: ❑ Area: 11,391 Sq Ft Width: 0 Depth: 0 Right Of Way(ft): 55 Nbr of Bldgs: 1 Nbr of Dwellings: 1 Review Information: Review Building Plan Review ReledBy; Originally Released: 4/17/2006 By: TMELBOU Landuse/Zoning/HE Conditions Relcas d'By t." Originally Released: 4/12/2006 By: CJJANSSE Sewer Review Released By. 09/16/04 Originally Released: 4/12/2006 By: amblake Operator: AMB Printed By: AMB Print Date: 4/18/2006 Project Number: 06001308 Inv: 1 Application Date: 4/12/2006 Page 1 of 2 THIS IS NOT A PERMIT Penalties will be assessed for commencing work without a permit Project Information: e^n Permit Use: Retaining wall Contact: NORRIS,GREG&HUEBSCHMAN,LAU Address: 2424 N COLEMAN RD C-S-Z: SPOKANE VALLEY,WA 99212 Setbacks:Front Left: Right: Rear: Phone: (509)954-8900 Group Name: Site Information: Project Name: by*,3e a„ „4 1:-i, .u aver W'9'.w.w, aa+k'aT±N.,dM1.,9>- f. iPF,� a.. Ya'ri_.m.sr :n`:9 i4Y,..3✓o'„Ae flL�:.F.S.^ atk&Y'' Plat Key: Name: SHP-02-04 District: Sout Parcel Number: 45281.2703 Block: Lot: 3 SiteAddress: 11609 E 20TH AVE Owner:Name: NORRIS,GREG&HUEBSCHMAN Address: 2424 N COLEMAN RD Location::CSV SPOKANE VALLEY,WA 99212 Zoning: UR-3.5 Urban Residential 3.5 Water District: Hold: ❑ Area: 11,391 Sq Ft Width: 0 Depth: 0 Right Of Way(ft): 55 Nbr of Bldgs: 1 Nbr of Dwellings: 1 Review Information: WINUMMONIMIESSUSEr Review Building Plan Review R � �a �_u Landuse/Zoning/HE Conditions Sewer Review 09/16/04 Originally Released: 4/12/2006 By: amblake Perm its: ,mss a � uiar ,:;: w• a a u r aur s. .W ,u i�a mow- rm Building Permit Contractor: OWNER Firm: OWNER Phone: (000)000-0000 Operator: AMB Printed By: AMB Print Date: 4/12/2006 Project Number: 06001308 Inv: 1 Application Date: 4/18/2006 Page 2 of 2 THIS IS NOT A PERMIT Penalties will be assessed for commencing work without a permit Building Permit Contractor: OWNER Firm: OWNER Phone: (000)000-0000 This Application: Total Project: Description Grp Type Notes Sq Ft Valuation Sq Ft Valuation 1&2 FAMILY R-3 VB retaining 0 $3,400.00 0 $3,400.00 wall Totals: 0 $3,400.00 0 $3,400.00 Item Description Units Unit Desc Fee Amount RESIDENTIAL PERMIT FEE 1 SELECT $97.25 WSBC SURCHARGE 1 SELECT $4.50 SF PLNS RVW<7999 SQ FT 1 SELECT $38.90 Permit Total Fees: $140.65 Payment Summary: r W -� a� ror a a e my eau , �w p�, , sro a a,a s y,ran: de, r Permit Type Fee Amount Invoice Amount Amount Paid Amount Owing Building Permit $140.65 $140.65 $0.00 $140.65 $140.65 $140.65 $0.00 $140.65 Disclaimer: Submittal of this application certifies the owner(or person(s)authorized by the owner)has both examined and finds the information contained within to be true and correct,and agrees that all provisions of laws and/or regulations governing this type of work will be complied with. Subsequent issuance of a permit shall not be construed to be a permit for,or an approval of,any violation of any of the provisions of the code or of any other state or local laws or ordinances. Signature: Operator: AMB Printed By: AMB Print Date: 4/18/2006 ezr 11ci70uu7i E uLrcar ue Ave, Suite 106S one PERMIT NUMBER Th1i i Spokane Valley,WA 99206 PERMIT FEE: y J __(509)688-0036 FAX: (509)688-0037 L I. ui city De eldpnitflt, '�,'w.spokanevalllev,ora.com I 4e5idectitiPI t:4!!'ilit action o New Construction o Accessory Bldg ekmit Ap lica T n r-i o Addition/Remodel o Deck L . ❑ Other: SITE ADDRESS 1/ (p 0 of F 7 .44.4. ASSESSORS PARCEL NO: LEGAL DESCRIPTION: Buildin ,:. , .,...., . • Contractor h';: Name: /A)chfv-1's, G k e - l--L_ALk�Gvc c_ �L Name: S��v+.�. Address: ('`_ v G� (� O — Address: City: Zip: City: Zip: Phone: Fax: Phone: Fax: Lic No: Exp.Date: :..._....,. ,- City Business Lic No: Name: (jy. e q & o vim; S Phone: CiEc-f _ 0 0 Describe the scope of work in detail: Cost of Project: I $ 1 go O O° j &Q 4-4--L C - U41 (Ly i ik-e (---.-e l ec CLQ /C i'.--, .',/-13c4 `( d1. **************The following MUST be complete: (write N/A if not applicable)********************** HEIGHT TO PEAK: DIMENSIONS: #OF STORIES: TOTAL HABITABLE SPACE: MAIN FLOOR TO SQ. 2'""FLOOR SQ. FTG: UNFIN BASEMENT SQ. FTG: IMPERVIOUS SURFACE FTG: AREA: FINISHED BASEMENT GARAGE SQ. FTG: DECK/COV. PATIO SQ. FTG: 30% SLOPES ON SQ. FTG: PROPERTY: #OF BEDROOMS: CONSTRUCTION TYPE: HEAT SOURCE: SEWER OR SEPTIC? DISCLAIMER The permitee verifies, acknowledges and agrees by their signature that 1) If this permit is for construction of or on a dwelling,the dwelling is/will be served by potable water. 2) Ownership of this City of Spokane Valley Permit inure to the property owner. 3) The signatory is the property owner or has permission to represent the property owner in this transaction. 4) All construction is to be done in full compliance with the City of Spokane Valley Development Code. Referenced codes are available for review at the City of Spokane Valley Permit Center. 5) This City of Spokane alley Permit is not a permit or approval for any violation of federal,state or local laws,codes or ordi noes.6) Plans or additiona ' formation may be required to be submitted, and subsequently approved before this application can be cessed Signature .� r-, - Date 14/3 / 6 (e, Method of Payment: (Faxed pe applications will only be accepted with major bankcard) 0 Cash (Check 0 Mastercard 0 VISA 0 Other Bankcard#: Expires: _ VIN#: Authorized Signature: REVISED 812512005 ►Jf�li €ZFG L L I v Jpzzgue Ave, suite 1 ub N I YI✓K ViiT UM ER: # Val e Spokane Vall X,WA 49206 _-!� (509)688-003 ( 5 6iC$- PERMIT FEE: Community Develcpraent w �.spokaTe v. ,c APR 12 Residential Construction I D' o`IlNe .struction o AccessoryBldg g Permit Application ] �J fn,` i Tk ; ' emodel o Deck Other: SITE ADDRESS ,,,///,'-(>76 ZJ 'N . ASSESSORS PARCEL NO: LEGAL DESCRIPTION: L•c-r 3 sP DZ -o y Building wµ` `.F. 5. • owner :: ;:,. :.<y,k:;' �,, .Contractor,;� ;,:..:;` • . .. Name: 6 we, Akatzi S Name: Address: Z-gz,i e'©iS144A/✓ Address: City: Villin/ Zip: 7921a City: Zip: Phone: q sem( ,Mc) Fax: Phone: Fax: f3 _ r Lic No: E .Date: f':_. jt-ale"�:'F'-+*'[--.• t��::�.tiL r'sf. :Contact:Pe_r""son':. • ` • ' -rte.-�r:.,ti:•? :�.t.,.+};�... "�,r`` ` ;" City Business Lic No: • Name: 6;404 Phone: Describe the scope of work in detail: Cost of Project: $ -5, qct i.g 126711/4/r1(, (A)/4/,L D(Q B. C)I'` /2E:6 JOc-?. e /7Avtti CSNJ /V 6;0(7 v1 vJ(li,L -;o 3, ,1," So•;c 4 � /., 5YL�(� �Gr'��e 6n �'�C�o'�'1 l7(Jr�-se **************The following MUST be complete: (write N/A if not applicable)********************** HEIGHT TO PEAK: DIMENSIONS: #OF STORIES: TOTAL HABITABLE SPACE MAIN FLOOR TO SQ. 2111`)FLOOR SQ. FTG: UNFIN BASEMENT SQ. FTG: IMPERVIOUS SURFACE FTG: AREA: FINISHED BASEMENT GARAGE SQ. FTG: DECK/COV. PATIO SQ. FTG: 30% SLOPES ON SQ. FTG: PROPERTY: #OF BEDROOMS: CONSTRUCTION TYPE: HEAT SOURCE: SEWER OR SEPTIC? DISCLAIMER The permitee verifies, acknowledges and agrees by their signature that 1) If this permit is for construction of or on a dwelling,the dwelling is/will be served by potable water. 2) Ownership of this City of Spokane Valley Permit inure to the property owner. 3) The signatory is the property owner or has permission to represent the property owner in this transaction. 4) All construction is to be done in full compliance with the City of Spokane Valley Development Code. Referenced codes are available for review at the City of Spokane Valley Pe t Center. 5) This City of Spokane Valley Permit is not a permit or approval for any violation of federal,state or local laws,codes o ordinances.6) Plans or additional information may be required to be submitted,and subsequently approved before • this applicatio ".ba be processed. Signature Date l -/ Method of Payment: (Faxed permit applications will only be accepted with major ankcard) 0 Cash 0 Check ❑ Mastercard VISA 0 Other Bankcard#: Expires: _ VIN#: Authorized Signature: REVISED 82srzDD5 Spalblian' e .0,001Valley 11707 E Sprague Ave Suite 106 ♦ Spokane Valley WA 99206 509.921.100D f Fax 509.921.1008 ♦ cityhalt@spokanevaltey.org Residential Plan Submittal Minimums ❑ Completed Building & Mechanical application with: Accurate address, Parcel Number and/or Legal Description, description of work, owner and contractor information, signature, and date. ❑ Two sets of plans including Site Plan, elevations, floor plans,foundation plans With details, roof plan, framing plans &details. ❑ Show the height of any proposed buildings or accessory structures. ❑ Floor plan for each floor Dimension to scale (minimum 1/8") and label each • Room (including sq. footage of house and garage on plans) Show each level of existing house and square footage of any additions. ❑ All braced wall panel types: show locations and details of installation, including engineered design. • ❑ Egress windows: Provide at least one window or exterior door approved for Emergency escape or rescue from a basement and in every room for sleeping. ❑ Smoke detector locations ❑ 22" X 30" attic access location O 18" X 24' crawl space access: • ❑ One-hour separation detail: between house and garage • ❑ Floor framing details: Joist type, size, spacing and installation details ❑ Roof framing plan and details ❑ Furnace and hot water heater location. • . o All header locations: type, size, and connections • • ❑ Foundation plan ❑ Insulation information 6\-1 RECEIVED BY AIEST '' CITY OF SPOKANE VALIF`i Materials Testing • Geotechnical Engineering March 28, 2006 AUG 14 2007 206-059G PERMIT ENTER BY: Mr. Ryan Yeoman Rock Placing Company 14115 East Trent Avenue Spokane Valley, WA 99216 Re: Geotechnical Design Evaluation Proposed Boulder Retaining Wall 11609 East 20th Avenue Spokane Valley, Washington Dear Mr. Yeoman, We completed the geotechnical design evaluation for the proposed boulder 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 analysis, opinions, and recommendations. PROJECT DESCRIPTION We understand that the proposed wall will consist of a boulder wall retaining the native soils. The exposed wall height will range up to 7 feet high. The ground surface above the wall will slope up at a 3:1 (horizontal to vertical) slope for approximately 4 vertical feet, and then flattens. The ground surface below the toe of the wall will be relatively flat. The face of the wall at the toe will be approximately 10 feet away from the house at its closest point. FIELD INVESTIGATION A geotechnical engineer from our firm visited the site on March 17, 2006. We observed the exposed soils along the alignment of the proposed wall. The exposed soils consisted of poorly-graded sands. The existing ground surface was relatively flat below the proposed toe of the wall and sloped upward at an approximate 3:1 (horizontal to vertical) slope for a total slope height of approximately 10 feet at the highest point. 1010 N. Lake Road • Spokane, Washington 99212 • (509) 534-4411 • Fax (509) 534-9326 Geotechnical Evaluation Norris Retaining Wall 11609 East 20th Avenue, Spokane Valley, WA 206-059G Page 2 The USDA Natural Resources Conservation Service (NRCS) has mapped the soils on and around the site in the Soil Survey of Spokane County, Washington as Marble loamy sand. The Marble soils are described as excessively drained soils that formed in sandy outwash. The permeability is rapid and the hazard of erosion is slight. Our observations indicate that the soils are consistent with the NRCS data. ANALYSIS AND RECOMMENDATIONS Design Data The proposed wall will range from 0 to 7 feet of exposed height. The ground surface below the toe will be relatively flat. The ground surface above the wall will slope up at a 3:1 slope for a total slope height of approximately 4 feet and then flatten. We designed a gravity retaining wall having a maximum exposed height of 7 feet. We designed the retaining wall using boulders having minimum diameters of 4 to 6 feet. We used a 14-degree setback from vertical for design. We have assumed that on-site sands will be used to backfill the wall. Assuming the soil types as described in our previous reports, we used the following strength parameters for design: Unit Weight, Soil Type Angle of Internal Cohesion, pounds pounds per cubic Friction, degrees per square foot foot Foundation 40 0 120 Retained 34 0 120 Infill 34 0 120 Stability Analysis Using the previously mentioned strength parameters, we performed a global stability analysis of the slope 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. The factor of safety we calculated was 2.089 for a 7-foot high wall (see Figure 3). For stability, an acceptable factor of safety would be 1.5. These results indicate that reinforcement will not be necessary. Based on our analysis, we recommend that the lowest course of boulders have a minimum diameter of 5 feet (also known as 6-man rock). We also recommend that the upper course of boulders have a minimum diameter of 3 to 4 feet (4 to 5-man rock) 1WEST Materials Testing•Geotechnical Engineering Geotechnical Evaluation Norris Retaining Wall 11609 East 20th Avenue, Spokane Valley, WA 206-059G Page 3 Foundation Preparation We recommend that the lowest course of boulders be installed a minimum of 1 foot below grade as measured at the wall face. This is recommended to provide the necessary bearing capacity for the wall foundation and to resist sliding along the wall base. The boulders 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 three feet wide. Backfill and Fill We recommend that fill placed within 12 inches of the backs of the walls consist of a clean, free-draining sandy gravel or pea gravel having less than five percent by weight passing a 200 sieve. This is necessary to provide for positive drainage through the wall face and reduce the potential for water to build up behind the wall. We recommend that the infill behind the wall consist of a sand or sandy gravel having less than 15 percent by weight passing a 200 sieve. We recommend that the backfill be placed in thin lifts not exceeding 6 to 8 inches. We recommend that the backfill be compacted to a minimum of 92 percent of the maximum dry density determined in accordance with the American Society for Testing and Materials (ASTM) Method of Test D 1557 (modified Proctor). Hand operated equipment should be used to reduce the potential of imposing excessive lateral stresses on the walls. OTHER CONSIDERATIONS We also analyzed the potential for excess lateral pressures to develop against the basement wall. We analyzed the lateral earth pressures on the below-grade wall using Rankine earth pressures. Lateral earth pressure against a below-grade wall develops as a result of movement in a wedge of soil (active wedge) defined by a failure plane extending from the bottom of the wall to the ground surface (see Figure 5). The angle of the failure surface ([3) is a function of the soil type present. For cohesionless soils (sands and gravels), the inclination of the failure surface is related to the angle of internal friction (0) according to the following equation: 13 = 45 + 0/2 (inclined from the horizontal) For the sands at the site, we assumed the angle of internal friction to be 30 degrees. This value is relatively conservative for sand soils. Using this friction angle, we calculated (3 to be 60 degrees. Using this angle to establish the failure surface and a wall height of 8 feet, we calculated the active wedge at the ground surface to be approximately 4.6 feet from the below-grade wall (see Figure 6). 11 WEST Materials Testing•Geotechnical Engineering Geotechnical Evaluation Norris Retaining Wall 11609 East 20th Avenue, Spokane Valley, WA 206-059G Page 4 Based on our analysis, the retaining wall and slope do not encroach upon the active soil wedge. Therefore, it is our opinion that the presence of the boulder retaining wall and slope above the retaining wall will not induce additional lateral pressures on the below-grade walls as constructed. REPORT LIMITATIONS This report has been prepared to assist in the design and construction of the proposed boulder retaining wall at 11609 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. This acknowledgement is in lieu of all warranties either expressed or implied. 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 your convenience. Sincerely, ALLWEST Testing & Engineering, LLC �✓ Q"k‘fli3y.Ne A Andy Eliaso EIT Staff En er4.g `k 4304,37240 !' Paul . Nelson, P.E. EXPIRES: Air�y- 7 Senior Geotechnical Engineer - _ - Attachment: Figure 1, Site Location Map Figure 2, SCS Map Figure 3, Slope Stability Cross Section Figure 4, Wall Section Figure 5, Active Earth Pressure Diagram Figure 6, Site Specific Earth Pressure Diagram 11 WEST Materials Testing•Geotechnical Engineering • •-_70:t.11 ,A, .:3-11.,:::ai` ',,,7': rekr .0-. •ik.- '1 All,,r!.• • ;,.•• ?t,•,�`w• li J +:"[' .k•y, ;... - '. .• �.1 ,e'4.0" y.' X151 � �,)1� Y:f,�• .IY' r w► r. :y'e'• L a •-f •r.• �'x „?'y1. f -�'�,,!�''YI'• t ':,., '�.*ti'A!"rl st'f�l'• )'S:i• :,'.10.') i:%.' ,d'F. �1�� O !'�z Y " t;�. •'t • t M p'.RSti,•.i• ` N_ t t't,"1"^•1 ' r+ �.^ • '",N'�a ;,�lr O N'.Id ,' �p Sl k, /1•J °' r`•'} 1.3:WP .`tit';4..G" i,,,,Vri. :,F;I.t .: fT 1 . ...' 1'. ..e.,'.1!P ,{nr .1 ..,'4" a -r�Ja,.. '-gf;k ,�, 'Idf5: r Figure 2 • F'-i i .: . & ,x 4.: 1.1€ - Site ,t a 4. 41 4 r e4 Py SCS Map Designed By: AJE Proposed Boulder Retaining Project 206-059G Wall A EST 11609 East 20th Avenue, March 27, 2006 * •Geolecnnical Engineering Spokane Valley, Washington Figure 3 206-059G 3-27-06 13:44 Norris Retaining Wall 125 _ 10 most critical surfaces, MINIMUM BISHOP FOS = 2.089 115 _ 1105 Q 95 _ >- 85 _ 75 0 10 20 30 40 50 60 70 80 X—AXIS (feet) Slope Stability Cross Section Designed By: AJE Proposed Boulder Retaining Project 206-059G Wall A ST 11609 East 20th Avenue, March 27, 2006 �� Spokane Valley, Washington 3:1 i' L""14-14° 1 ` MIN. ' COMPACTED FILL 4 7' ) UNDISTURBED NATIVE SOIL OR PREVIOUSLY COMPACTED STRUCTURAL FILL 1 I . . ) 1 1 12"MIN t �--_. COMPACTED UNDISTURBED NATIVE SOIL OR BEDROCK TITLE: BOULDER ROCK WALL AZA SCALE: DATE: PROJECT #: HAYDEN, IDAHO & SPOKANE, WASHINGTON FIGURE 4 NONE 03/28/06 206-059G (208) 762-4721 (509)534-4411 Figure 5 ; l £ _I a , 40, Failure Surface Active Wedge H ♦ 4 / a 45+ /2 d u ♦ e t Q Active Earth Pressure Diagram Proposed Boulder Designed By: PTN Retaining Wall Project 206-059G � , 11609 East 20th Avenue, A EST Spokane Valley, March 27, 2006 `�� Washington • • • Figure 6 2:1 SLOPE--� BOULDER RETAINING WALL 10' 4.6' { : >7 Failure Surface Active Wedge 8' 4 •600 • t 3 " Site Specific Earth Pressure Diagram Designed By: PTN Proposed Boulder Project 206-059G Retaining Wall 11609 East 20th Avenue, A EST Spokane Valley, March 27, 2006 Mdedds lsollrip•G/OkUricd Efiginesting Washington CITY COPY THIS BUILDING SUBJECT TO FIELD INSPECTION CORRECTIONS :07 . COP PLIANCE SNOKANE VALLEY LDiN DIVISION —rc� ,7 6-c - w RECEIVED BY + CITY OF SPOKANE VALLEY \-1 1 WEST AUG 14 2007 Materials Testing •Geotechnical Engineering PER CENTER August 15, 2006Y'206-225G Ms. Laura Huebschman 11609 East 20th Avenue Spokane Valley, WA 99206 Re: Erosion Control Recommendations Proposed Residential Structure 11609 East 20th Avenue Spokane Valley, Washington Dear Ms. Huebschman, As you requested, we have prepared this letter regarding erosion control at the above-referenced site in Spokane Valley, Washington. The purpose of our services was to provide recommendations for remediation and control of erosion at the site. This letter summarizes our opinions and recommendations. FIELD INVESTIGATION A geotechnical engineer from our firm visited the site on August 11, 2006. We observed the exposed soils above the boulder retaining wall along the east and north sides of the house. Several moderately deep erosion gullies were observed in the slope above the wall and on the slope west of the wall. The soils at the site consist of poorly-graded sands. Vegetation was sparse with scattered weeds. OPINIONS AND RECOMMENDATIONS Based on our observations at the site, we recommend re-grading the slopes, placing either topsoil or erosion control matting, and establishing vegetation. We recommend that the erosion gullies be filled with on-site soils and the slopes re- graded. If topsoil is placed, we recommend placing a minimum thickness of 4 inches. If erosion matting is placed, we recommend placing a matting that would act as a growing medium and would also decompose over time. We recommended that the areas be seeded prior to placing the matting and reseeded immediately after placing matting or topsoil to establish vegetation as soon as possible to reduce the potential for further surface erosion to occur. 12928 E. Indiana Avenue • Spokane, Washington 99216 • (509) 534-4411 • Fax (509) 534-9326 Erosion Control Recommendations Proposed Residential Structure 11609 East 20th Avenue, Spokane Valley, WA 206-225G Page 2 We recommend that the remediation occur as soon as possible as August is a relatively dry month. Remediating now would allow for vegetation to establish itself prior to the wetter fall season. In addition, we observed that one of the erosion gullies was near a power pole at the top of the slope above the boulder retaining wall. Based on our observations, it is our opinion that the current level of erosion has not affected the stability of the pole. However, replacing the soils in the erosion gully as soon as possible will limit the potential for instability due to further erosion. REPORT LIMITATIONS This report has been prepared to address observed surface erosion at 11609 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. This acknowledgement is in lieu of all warranties either expressed or implied. 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 your convenience. Sincerely, ALLWEST T ing & Engineering, LLC �,, �t ikE tS Paul T. Nelson, P.E. Senior Geotechnical Engineerit XPIIRES412Y C 7 �- P WEST Materials Testing•Geotechnical Engineering gLANNING DEPT. APPROVED BY•� � 0�- DATE•. � Z PAC) Pcysc1; r /Goq c ? - Z0T 3 -:51� OZ -o`/ Z-ja,VjM—'.'� L:+-�`1i 11 AAII;�