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Home My WebLink AboutGEO-Tech Review - COM Engineering / Geo-Tech Reports - 8/6/2015 �wv�►-otecl� ��v�.eer�v�,g ceotechv�.c.OL- EvW. rov�xvtevt,OL -DY-R v age -T oadwaU RECEIVED December 22, 2014 FEB 2 3 2015 426 W. CEDAR ST. Jerry K. Schaaf WIG`*Sec/Tres.Wondervue Association L N I PO Box 356 Union, Washington 98592 RE: Bulkhead/Retaining Wall Evaluation—Wondervue Condominiums, 5321 E State Route 106, (Parcel 32232-56-00900)Union,Washington Dear Mr. Schaaf, Envirotech Engineering (Envirotech) has completed this retaining wall analysis of an existing modular block wall, and its influence with respect to an underlying concrete bulkhead. The block wall reportedly replaced a rock wall about 3 years ago. For design considerations, the block wall is 3 feet high by 18 feet in length above a portion of the bulkhead that is 4 feet to 6 feet above grade. The existing reinforced concrete bulkhead has been recently addressed by Envirotech for repairs. The following analysis is provided: Existing Concrete Bulkhead with Block Wall Surcharge Soil Parameters y = 120 psf T = 35 ° ca = 0 psf Pore Pressure: No Earth Pressure: Active 0 ° yw= 62.4 psf Load Inputs q 0 psf DL 0 Ib/ft LL 0 Ib/ft w 0 lb Soil Conclusions K 0.27 Wall Geometry (assumed) Ke 0.24 B = 60 in 6 23.33 h = 12 in 4P 0.00 Po gox994 getfn�r, wash�wgtovu92.s28 Ot f: 360-2 j Cell: 3G�0-68°1-6046 �aK: 360-2��4�89 ewv%rotech@g eotech uLi.ca law fD.cDtM r i b= 12 in Rsl 1625.94 H = 10 ft RsH1 1492.96 t= 10 in RsV1 644.00 D= 2 in Rw 0.00 n = 12 in Rq 0.00 Key: No RqH 0.00 RqV 0.00 Re 1099.99 Rs2 0.45 RsH2 O.41 RsV2 0.66 Sliding Fr= (ZWi + RsV1 + RgV)tan6 + cA+ RsH2 + RsV2 2520 Ib/ft Fs = RsH1 + RqH + Re + Rw 1493 lb/ft F.S.static= Fr/Fs 1.7 o.k. F.S.dynamic= Fr/(Fs+ Re) 1.1 o.k. Overturning Mr= F-Wixi + RsH2y2 + RsV2xsV2 + RsV1 + RgVxsV1 16285 lb Mo = RsH1yl + Rwyl + RgHyq 4977 lb F.S.static= Mr/Mo 3.3 o.k. F.S.dynamic= Mr/(Mo + Reye) 1.4 o.k. Block Wall Analysis saturated unit weight of soil (pcf) 130 angle of internal friction (phi) 36 adhesion, ca (lb/ft^2) 0 Footing depth, D (in) 0 height of wall, H (ft) 3 average size of rock (in) 12 maximum weight of rock(lb) 76 coefficient of friction between rocks 0.6 dead loads on wall (lb/ft) 0 live loads on wall (lb/ft) 0 surcharges (psf) 0 distance from top of wall to surcharge (ft) 0 Page 2of 3 OUTPUT Soil Parameters earth pressure coefficient, k 0.26 earthquake pressure coefficient, kh 0.19 angle of external friction, delta 24.00 deg Active Rankine Zone (ARZ) angle 63 deg 90-ARZ 27 deg Lateral pressure from soil 44 Ib/ft Lateral pressure from water 156 Ib/ft Lateral pressure from earthquakes 9 Ib/ft Lateral pressure from surcharges 0 Ib/ft Resultant earth pressure 209 Ib/ft Resultant horizontal earth pressure 191 Ib/ft Resultant vertical earth pressure 85 Ib/ft Resultant location from base of single rock 0.35 ft Resistance against overturning, Rov 235.1 Factor of Safety, F.S. 3.6 We conclude that the existing block retaining wall and its influence of the concrete bulkhead is satisfactory. Envirotech appreciates the opportunity to be of assistance on this project. We anticipate that this retaining wall analysis/ conclusions will meet your expectations. Please contact Michael Staten at 360-275-9374 if you have any questions or require additional information. Sincerely, Envirotech Engineering 1��1 CLYDE ST �X WASy�L 9Tn. r , � r2/Z?//� �3045 VC �FcIsre�E° w rs%NAI- Michael Staten, P.E. Project Director Page 3of 3 ,fir-��`�'�, �....•- • _ � - f J �'� S 6�•y-. ,�4 t. ' • � !-yam r[��.� ,y.� � � �• i-2/05!2014 ir Tt it T � .$ v, r� wk� .� 12 0 l2014 a EXISTING CONCRETE BULKHEAD .d . .d MHHW VARIES a ' —8.5 FT MAX ABOVE GRADE a d . o CORE DRILL F❑❑TINGS 4' d D.C. AS C❑NSTRUCTION AID TO PLACE CONCRETE. b ALLOWS FORM TO MOUNT d FLUSH TO FOOTING. ZERO NET LOSS OF BEACH STRATA SEVERE UNDERMINING ALONG ISOLATED L❑CATIONS d - a d BEACH GRADE VARIES 2 FT FILL CAVITIES J WITH CONCRETE PROPOSED CONCRETE PLACEMENT 2 FT I-- NOTES, 1. ALL CONCRETE TO BE PLACED ON COMPETENT UNDISTURBED SOIL. 2. ALL CONCRETE SHALL HAVE A MINIMUM 28-DAY PROJECT/ OWNER/ LOCATION: COMPRESS3. CONCRETEVE SHALLRENGTH OF 2500 BE PLACED USINpsi. (MECHANICAL CLYDF S W❑NDERVUE C❑NDOMINIUMS VIBRATION. P T 4, AT A MINIMUM, CONCRETE SHOULD EXTEND 2 FEET `L� OF %NAS�jt1, �� BULKHEAD REPAIR BELOW BEACH GRADE, AND FROM THE FOOTING TOE WONDERVIEW CONDOMINIUMS TO THE BACK FACE OF THE WALL AS SHOWN. 5321E STATE ROUTE 1IU UNION 5. FOUNDATION REPAIR SHOULD BE PERFORMED IN 17' PARCEL STATE O E 10 MAX ALTERNATING INCREMENTS. MASON COUNTY 6 00900 6. FAST CURING ADDITIVES SHOULD BE APPLIED TO `� CONCRETE MIX, AS SALT WATER SHOULD NOT /•:: ENGINEERi CONTACT WET CONCRETE. v owENVIROTECH ENGINEERING 7. ALL WALL CRACKS AND SEPARATATIONS SHOULD BE P 4?0�$ PO BOX 984 THOROUGHLY CLEANED AND FILLED WITH MARINE � �i. GRADE EPDXY. , �C ISTE. BELFAIR, WASHINGTON 98528 8. ALL WORK SHALL BE IN ACCORDANCE WITH f�SjO�,ALti�� 360-275-9374 PROPRIATE IBC, STATE AND LOCAL CODES. DETAILS y��'�C:1wi,CR.i° >✓�r.,vi�pwz��rs�i°D�GiiwO,1� °Rf;v".��:'?U July 25,2014 Wodervue Condominiums PO Box 36 Union, Washington 98592 RE: Bulkhead Repair for Wondervue Condominiums 5321 E State Route 106, Union, Washington Envirotech Engineering has completed this geotechnical/structural evaluation for a concrete bulkhead repair at the referenced property. The following analysis provides an analysis for sliding and overturning. Design sheets enclosed with this letter depict specifications and other information relating to this retaining wall design. Soil Parameters Y= 120 psf tP= 35 ° ca = 0 psf Pore Pressure: No Earth Pressure: At-rest P = 5 ° Yw= 62.4 psf Load Inputs q 0 psf DL 0 Wit LL 0 Ib/ft w 0 lb Soil Conclusions K 0.46 Wall Geometry(assumed) Ke 0.26 B= 60 in b 23.33 h= 12 in W 0.00 b= 12 in Rsl 1362.95 H = 7 ft RsH1 1251.48 t= 10 in RsV1 539.84 D - 2 in Rw 0.00 n = 12 in Rq 0.00 Key: No RqH 0.00 RqV 0.00 Re 569.59 Rs2 0.77 RsH2 O.71 RsV2 0.66 I PO BOX 984 Belfair,Washington 98528 Off: 360-275-9374 Cell: 36o-689-6045 Fax: 360-275-4789 envirotech@geotechnicalinfo.com 1 of 3 Sliding Fr= (7-Wi+ RsV1 + RgV)tan6+cA+ RsH2+ RsV2 1821 Ib/ft Fs= RsH1 + RqH+ Re+ Rw 1251 Ib/ft F_S.static= Fr/Fs 1.5 o.k. F.S_dynamic= Fr/(Fs+ Re) 1.1 o.k. Overturning Mr= EWixi + RsH2y2+ RsV2xsV2+ RsV1 + RgVxsV1 11668 lb Mo= RsH1yl + Rwyl + RgHyq 2920 lb F_S.static= Mr/Mo 4.0 o.k_ F.S.dynamic=Mr/(Mo + Reye) 2.2 o.k. Y= soil unit weight q = surcharges T= angle of internal friction DL= dead loads on wall ca= adhesion LL= live loads on wall Pore Pressure: pressures due to water w= extra sliding/overturning resistance Earth Pressure: active, passive, or at rest ¢= angle of backfili Yw= water unit weight B = footing width h = footing thickness b = footing length Fr= resistance against sliding H = height of wall Fs= sliding forces t= wall thickness F.S.static= Factor of Safety.(static) D = foodting depth F.S.dynamic= Factor of Safety(dynamic) n = footing length beyond wall face Key: "notched"footing for sliding resistence Mr= resistance against overturning Mo= overturning forces F_S_static= Factor of Safety(static) F.S.dynamic= Factor of Safety(dynamic) K= earth pressure coefficient Ke = earthquake pressure coefficient s= Rsl = soil partical resultant force RsH1 = horizontal resultant force RsV1 = vertical resultant force Rw= pore water resultant force Rq = surcharge resultant force RqH = horizontal surcharge component 2of3 RqV= vertical surcharge component Re= earthquake resultand force Rs2= opposite soil partical relultant force RsH2 = horizontal component RsV2 = vertical component Envirotech is pleased to submit this engineering analysis. If you have any questions or need additional information, please contact Michael Staten at 360-275-9374. Best Regards, Envirotech Engineering `, cJ_�f) /STl Michael Staten, P.E. Project Manager 3 of 3 � w eKVwoteak evL-oivxeer K O ceotechwacal- AraCwage 0 izoadwa� RE CE jVED July 31, 2015 AUG 0 6 2015 426 W, CEDAR ST. Jesfield Construction PO Box 1590 Allyn,Washington 98524 RE: Bulkhead Repair Inspection—Wondervue Condominiums, 5321 E State Route 106, Union, Washington(Pmel 32232-56-00900) COM2O15-00039 To Whom It May Concern: Envirotech Engineering (Envirotech) has conducted inspections of the reinforced concrete bulkhead repair for the referenced project known as the Wondervue Condominiums Bulkhead Repair. Site inspections were performed on July 29", and July 30t', 2015. Envirotech verified reinforcement steel, extents of the repair, and observed concrete placement. We certify that work performed exceeded the engineered plans prepared by Envirotech, dated February 21,2015, which were approved by Mason County DCD Planning on July 14, 2015. Please call Michael Staten at 360-275-9374 if you have any questions or require additional information. Sincerely, Envirotech Engineering ty CLYDp S G OF ASy� T9T ti T F k 43045 cif FC/STYE NALtiNG` Michael Staten,P.E. Project Director PO gox984 gel fair, Washiwgtovti98528 Off: 360-2j 593�-4 CCU: 360-689-6045