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HomeMy WebLinkAboutBLD2008-00204 Geotechnical Report • • .r# `a' NTI ENGINEERING & SURVEYING 717 SOUTH PEABODY STREET,PORT ANGELES,WA 98362 Engineers■Land Surveyors■Geologists Construction inspection■Materials Testing NTI (360)452-8491 1-800-854-5545 FAX 452-8498 E-Mail info@nti4u.com www.ntidu.com 5/29/09 Royal &Valerie Schindler 270 Rhododendron Lane Brinnon WA 98320 RE: Construction and Completion of Rockery Bulkhead Wall,TPN 502151022 Dear Royal&Val Schindler: At the request of Jefferson County Building Department and Washington State Fish& Wildlife, I observed the construction of the Rockery Bulkhead Walls constructed at the above location. These rock walls were complicated in their location on the hill and at the toe of slope and included a concrete deck between the walls and four tall timber pilings. See photos below. ,, :‘.)4,11,1'i.t1,,,4$41il ‘,$:,;•'./117.,,.!kt,',:/`'g'il,:*„)",47,{4;t1 • 04. 44,.,,f. „,, v,..14..... ,„4 iz . i.,, 5 ' , - srkx� a r`_. ",r a Ysw t 1 r t ; r r p er, '' �t , ,, ;;� , �. - 1• C,�-"�xn x?y �' a '. M �y� i rs w ,t '4 ,,..L' .. x _.r '„�'.w. ‘4, - - ,t oili 01 iES , a•. i E These walls meet the intent of the Engineering for the bulkhead in these locations and it is our opinion that they meet the requirements set forth by the construction and pennit documents. This was an emergency repair for the bulkhead that was created by a slide during storms and major rains in the winter of 2007/2008. If you have any questions regarding this matter please contact us. Sincerely, NTI ENGINEERING & SURVEYING,INC. �F ,yE �, �,\N 'p4 'J!q c� , /, 4. Catherine Bailey,P.E. Y '1'4)z' Project Engineer � ;fir /� ' - 4 - 44468 00 4; k. q 1siVR \\ ASS/ONAl -4$' G:\Gen\Catherine\2008 Jobs1SCHY0802 Retaining Walls&Stairs\Rock Wall Constructic • ,L-DO8-ao4 bL Doq- May 30, 2009 To: David Johnson,Jefferson County Project Planner CC: Stacie Hoskins Subject: MLA09-00002, Schindler Stairway to Beach Replacement Hi David, The purpose of this memo is to provide a consolidated response to the DOE comments letter dated May 8, 2009 (Subject: Comments on stairway application for a building permit). My first response was emailed to you on Friday, May 15,2009 at 10:10 am. The comment letter from DOE identifies three areas of concern: Shorelands, Solid Waste &Financial Assistance and Water Quality. My comments below are to that of Shorelands. I accept the provisions/recommendations for Solid Waste& Financial Assistance and Water Quality. As a steward of my own land these last two comments are in my best interest. However, 1 have serious concerns about the shoreland recommendation to change my design such that the size of the landings are no wider that the stairway. Shading Impact First of all,the landing at the top is to be constructed at ground level and the one at the bottom will be about 5.5 feet above the concrete base. Neither of these decks affects the shading of the bank. The second deck from the top is to be constructed above an old deck that was built many years ago by the prior owners of the property. After this old deck is removed, the amount of shading will actually be reduced allowing more vegetative growth. This deck combined with the top deck was designed to provide further reinforcement of the bank stabilization features of the structure(i.e. they help to contain sloughing). Because of the distance of decks three and four from the hillside,the flow of sunlight does not shade any particular area for more than a couple of minutes at any one time.The extra width of deck three is approximately 23 ft off the bank horizontally and 26 ft vertically from the concrete base. The extra width of deck four is approximately 15 ft horizontally and 16 ft vertically off the concrete base. The design of the stairs at these two points has the landings on four vertical pilings (two for each landing)which support the stair structure with a minimum of mass. These "stilts" were designed to suspend the stairway structure from the hank to minimize the impact to the hank either from damage due to structural loads or from damage to the environment of the native vegetation which is the specific concern of the I)OE letter. The shadowing effect of the entire staircase is almost identical in nature to that which exists naturally from shade from the random 1 of2 i • evergreens found along the bank from crest to toe. Native lower foliage and ground cover is shade tolerant. The extra width of the landings that only occur on the waterside of the structure adds no consequential shading. Further the extra width of these two decks casts most of the shadows on the stair supporting structure before coming in contact with the bank vegetation. Because of the distance of the stair structure from the bank, the shadow effect of sunlight is present only for a short time during the early morning hours and as the sun moves westward the sun shines behind the structure directly onto the bluff. Any shadowing at that time would affect only the retaining wall and platform below. After about l pm to 2pm all sunlight is indirect on this East facing bluff and as a result any shading caused by the deck design extends out onto the beach without any impact to the bluff. The entire stairway design was conceived to minimize impacts to the bluff and will be very consistent with the kind and quantity of sunlight reaching the bluff prior to construction. Safety Impact The stairway is approximately 50 vertical feet of travel. Because of this distance, the concept of the landings and the additional width of the two landings in question were provided to meet residential code landing spacing and to provide rest stops out of the path of the stairway for people climbing this sizable structure. These rest stops are even more important when considering such things as emergencies, the safety of the elderly or very young and when transporting things like coolers, tables and chairs crab pots etc. for use at the beach. Without these rest stops, the stairway would be far more difficult and dangerous to use. Because of my wife's fear of heights, she would be unable to use the stairway if constructed per the recommendations of DOE. Safety in the design of the deck structure was of paramount importance and this issue was communicated to our engineering team and incorporated into the submitted design. Design Presidence The design of this new stairway was patterned after my neighbors' who is also the architect for the new stairway design. I submit pictures showing that the vegetation for his design is actually flourishing. Respectfully, Bud & Val Schindler 270 Rhododendron Lane Brinnon, WA 98320 2 of 2 17 NTI ENGINEERING &SUR YIN 717 SOUTH PEABODY STREET,PORTANGELES,WA 98362 Engineers I Land Surveyors IN Geologists • Construction Inspection■Materials resting Nil (380)452-8491 '•1-800/654-5545 FAX452-8498 E-Mail:irtfo©ntf4u.com www.nti4u com October 16, 2008 " Jefferson'County Department of Community Development 621 Sheridan St. • \ Port Townsend, WA 98368 Subject: Shoreline Revetment Wall for Bud and Val-Schindler • - • To Whom It May Concern: I spoke With Donna from the Community Development Department of Jefferson County. today, October 16,2008. After a discussion with her and review of the gebtechnical report for this project it is understood and agreed that each end of the lower revetment wall needs to return into the hillside to reduce the possibility of erosion from wave action working its way back behind the wall. If you have any questions please feel free to contact me af(360) 452-8491, Sincerely;'; NT!Engineering & Land Surveying Catherine Bailey, PE N E R. Project Engineer Q`� of .�,ps ,���1 cc: Bud &Val Schindler • /Pe 444•8 : /STAR SIONAL ECE1 #f` OCT 2-O 2008 JEFFENSON CUUNr1 ULu G:\Gen\Catherine\2008'Jobs\SCHY0802 Retaining Walls&Stairs\Plan Review Response.doc 11111 1 , NTI ENGINEERING & SURVEYING / 717 SOUTH PEABODY STREET,PORT ANGELES,WA 98362 Engineers I•Land Surveyors■Geologists I Construction Inspection I•Materials Testing (360)452-8491 1-800-654-5545 FAX 452-8498 E-Mail:info@nti4u.com N TI www.nii4u.com December 11, 2008 15 Jefferson County Department of Community Development 621 Sheridan St. Port Townsend, WA 98368 Subject: Bank Stabilization To Whom It May Concern: We are writing this letter in response to the"Conditions of Approval" for the revetment Building Permit#BLD08-00204 given to Royal Ae hindler and re-vegetation plan be approved by NTI and erie J. Schindler issued 11/3/2008. Condition#3 is requiring a r ge submitted to Jefferson County for review and approval.can be done to promote vegetation y NTI and dated April 16, 2008 states that anything growth on the bluff face should be attempted. importance of attempting to re-vegetate he bluff and NTI and the homeowner understand that re-vegetating the slope will be a difficult and ongoing task. With these understandings we firmly believe that the engineered b line the revetment walls,af o vertical timbers, and concrete slab have been designed to sufficiently his property to prevent the continuation of the slide. In addition de down the s lope,wil increase the management,correctly tied into the existing tight stabilization of the slope. If you have any questions please feel free to contact me at(360) 452-8491. Sincerely; NTI Engineering & Land Surveying �R\F WA Sy/NNE R \\\s-PE Catherine Bailey,PE e/lam Project Engineer rety:1 I ii tits cc: Royal&Valerie Schindler 2. ADO 4)F6,4 468o_ �4ci is ECG\ IJ'�►"U� G:\Gen\Catherine\2008 Jobs\SCHY0802 Retaining Walls&Stairs\Bank Stabilization.doc t • 4 7";rr NTI ENGINEERING & SURVEYING 717 SOUTH PEABODY STREET,PORT ANGELES,WA 98362 / Engineers II Land Surveyors■Geologists Construction Inspection■Materials Testing tIll (360)452-8491 1-800-654-5545 FAX 452-84 AppR www.nti4u.com SITE PLAN October 16, 2008 - 3 2008 Jefferson County Department of Community Developme JEFFLRsoN COUNTY 621 Sheridan St. nEri•of c rviurrlTY E�'El o''`'TNT Port Townsend, WA 98368 sIGNATU[� Subject: Shoreline Revetment Wall for Bud and Val Schindler To Whom It May Concern: I spoke with Donna from the Community Development Department of Jefferson County today, October 16, 2008. After a discussion with her and review of the geotechnical report for this project it is understood and agreed that each end of the lower revetment wall needs to return into the hillside to reduce the possibility of erosion from wave action working its way back behind the wall. If you have any questions please feel free to contact me at (360) 452-8491. Sincerely; NTI Engineering & Land Surveying �� 1NE R. B Catherine Bailey, PE /P� ,of WASy�N�A7/ Project Engineer �P , F- t ��� cc: Bud &Val Schindler flip, /1 Ir,, -9p 43F 44468 cO ' eSSIONAL ECGIR /61-4 '�d CEP\TF,- (� OCT 2 0 2008 Ji.tOSH C'ut1N11 ULu MOM # IN G:\Gen\Catherine\2008 Jobs\SCHY0802 Retaining Walls&Stairs\Plan Review Response.doc ,�I RS16 'L AT [C' • • ) cti9i' .c. 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