HomeMy WebLinkAbout2041.01 McCarthy Planning Modification Ltr
19019 36th Avenue West, Suite E Lynnwood, Washington 98036 (425) 582-9928
Zipper Geo Associates, LLC
Geotechnical and Environmental Consulting
Project No. 2041.01
August 26, 2019
Mary McCarthy
3403 Burnett Avenue North
Renton, WA 98105
Subject: Land Use Code Modification Request
McCarthy Slope Stabilization
3403 Burnett Avenue North
Renton, WA
Dear Ms. McCarthy:
Zipper Geo Associates, LLC prepared retaining wall construction plans and stability calculations for the
proposed slope stabilization project located on your property dated August 8th , 2019. The City of
Renton Land Use department reviewed those plans and indicated that modifications to the plans are
required in order to meet Section 4-4-040.2.e.i and 4-4-040.2.f of the Renton Municipal Code (the
Code). It is not feasible to meet those requirements and the purpose of this letter is to provide required
information in support of a Land Use Code Modification Request as required and described in the
Renton Planning Division’s Submittal Requirements, Modification document. The requested
information or reference to it is provided below.
1. Pre-Application Meeting Summary: A formal pre-application meeting was not held. However,
email correspondence with Ms. Vanessa Dolbee was completed and through that
correspondence, Ms. Dolbee has indicated that it appears the modification can be approved.
2. Wavier Form: No waiver form was provided.
3. Land Use Permit Master Application Form: A land use permit master application form was
previously submitted and is also attached to this letter.
4. Fees: Fees have not been submitted, however Ms. Dolbee has indicated the fee will be
determined after the Modification submittal information has been received.
5. Project Narrative: The project will consist of constructing a two-tiered retaining wall and
associated landscaping on a slope located along the west side of the subject property. The
slope is currently experiencing erosion and shallow landslide instability. The purpose of the
retaining walls and landscaping is to permanently stabilize the slope. Detailed information
regarding the geometry of the proposed retaining walls and landscaping can be found on the
attached plans.
6. Justification for the Modification Request to Section 4-4-040.2.e.i: Section 4-4-040.2.e.i of
the Code requires that “The width of a terrace shall be equal to the height of the tallest abutting
retaining wall; however, the minimum terrace width shall be two feet (2').” The tallest abutting
retaining wall under the current proposal is 4 feet. As such, this section of the Code would
require a minimum terrace width of 4 feet. Under the current proposal, a terrace width of only
Zipper Geo Associates, LLC
McCarthy Slope Stabilization
Project No. 2041.01
August 26, 2019
19023 36th Avenue West, Suite D Lynnwood, Washington 98036 (425) 582-9928
Page 2
3 diverging to 4 feet can be provided for approximately the south half of the upper proposed
retaining wall (Wall 2). The only feasible retaining wall system that can work at this site due to
access constraints is one installed with hand-carried equipment as currently proposed. The
proposed wall system is at it’s structural limit. Moving Wall 2 down-slope to provide the 4 foot
terrace width for the entire wall length would result in inadequate structural capacity for the
lower wall (Wall 1) as the upper wall would begin to impose passive lateral earth pressures on
the lower wall therefor requiring a wall with larger structural elements that cannot be installed
with hand-carried equipment. Adding capacity to the lower wall through installation of
additional piles is not feasible as the piles are spaced as close as reasonably feasible such that
they do not interact therefore reducing capacity. Using machined equipment to install larger
structural elements is not feasible as the existing home blocks access to the area from the top
and such equipment would have inadequate reach from the bottom.
Justification for the Modification Request to Section 4-4-040.2.f: Section 4-4-040.2.f of the
Code requires that “For land area that is not between two (2) retaining walls (i.e., not a terrace),
the lower soil grade (i.e., ground at the bottom of a retaining wall’s exposed surface) and the
upper soil grade (i.e., ground at the top a retaining wall) abutting a retaining wall shall be level
for a horizontal distance (measured perpendicularly to the wall) equaling one foot (1') for every
one foot (1') in height of the retaining wall.” This section would require a level grade at the
bottom of the lower wall (Wall 1) extending 4 feet from the wall face. A gently sloping grade
extending only 3 feet from the wall face can be provided under the current proposal. Providing
a level grade distance of 4 feet would require the height of Wall 1 to be increased or the tier
width between Walls 1 and 2 to be decreased. For similar reasons under the justification for
Section 4-4-040.2.e.i, a 4 feet level grade distance cannot be provided. The current proposal is
at it’s structural limit.
Modification Compliance: We interpret that the primary intent of the land use requirements
under the sections in which modifications are requested is one of aesthetics. It is our opinion
the proposed modification substantially meets the land use element by providing 3 of the 4
feet required and is the minimum adjustment needed to allow for the proposed retaining wall
system. Providing 3 of the 4 feet will still allow for landscaping and an aesthetically pleasing
finished product. The proposed modification allows for safety and environmental protection
by stabilizing an otherwise relatively unstable slope. The proposed modification will not be
injurious to other properties in the vicinity as it still provides a majority of the requirements.
The modification is justified and required based on reasons cited above. The modification will
not create adverse impacts to other properties as it provides a majority of the require ments.
7. Neighborhood Detail Map: See attached.
8. Site Plan: See attached plans.
9. Architectural Elevations: See attached plans.
Zipper Geo Associates, LLC
McCarthy Slope Stabilization
Project No. 2041.01
August 26, 2019
19023 36th Avenue West, Suite D Lynnwood, Washington 98036 (425) 582-9928
Page 3
Respectfully submitted,
Zipper Geo Associates, LLC
Robert A. Ross, P.E.
Principal
8/26/19
FIGUREJob No.Zipper Geo Associates, LLC19019 36th Ave. W.,Suite ELynnwood, WASHT. of11NEIGHBORHOOD DETAIL MAP2041.01DATE: AUGUST 20191MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASCALE IN FEET010010050PROJECT SITEN 34TH ST.N 35TH ST.BURNETT AVE. N
LAKE WA BLVD. N
DESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTSAS SHOWNCONTACT INFORMATION:CLIENT:MARY MCCARTHY3403 BURNETT AVENUE NORTHRENTON, WA 98327(253) 720-0126LANDSCAPE ARCHITECT:FRANCINE M DAY LANDSCAPE ARCHITECTURE700 NW 42ND STREET, #409SEATTLE, WA 98107(206) 930-7493GEOTECHNICAL ENGINEER:ZIPPER GEO ASSOCIATES, LLC19019 36TH AVE. WEST, SUITE ELYNNWOOD, WA 98036(425) 582-9928CONTACT: Robert Ross, P.E.rross@zippergeo.comSHEET INDEXC1.0 - SITE AND TESC PLANC2.0 - TESC NOTES AND DETAILSC3.0 - GRADING AND DRAINAGE PLANC3.1 - DETAILSC3.2 - DETAILSC3.3 - DETAILSAPPROXIAMTE SCALE IN FEET051010BASEMAP FROM TOPOGRAPHIC SURVEY BY TYEE SURVEYORS DATED 6/14/18 AND MODIFIED BY ZGAINSTALL CATCHBASIN FILTERHATCHED AREA INDICATESAPPROXIMATE LIMITS OF SLOPESTABILIZATION WORK3403 BURNETT AVENUENORTHPROPOSED RETAINING WALLSEXISTING ROCKERY
TEMPORARY EROSION AND SEDIMENT CONTROL GENERAL NOTESPART 1 - GENERAL1.THE SUCCESS OF THIS PROJECT IS HIGHLY DEPENDANT ONCONTROL OF SURFACE WATER RUNOFF INTO THE WORKAREA TO PREVENT EROSION AND FURTHER DESTABILIZATIONOF THE SLOPE.2.COMPLETION OF THIS PROJECT WILL REQUIRE TEMPORARILYREMOVING VEGETATION FROM A STEEP SLOPE. THEEXPOSED SURFACE MUST BE PROTECTED FROM EXPOSURETO DIRECT RAINFALL AND SURFACE WATER RUNOFF TO THEEXTENT POSSIBLE DURING CONSTRUCTION. IF WETWEATHER IS EXPECTED (DEFINED AS FORECAST RAINFALLGREATER THAN 0.25 INCHES IN A 12 HOUR PERIOD), AT THEEND OF EACH WORK DAY, THE SLOPE SHALL BE COVEREDWITH ANCHORED PLASTIC SHEETING. AREAS OF THE SITETHAT WILL BE UN-WORKED FOR MORE THAN TWO DAYSSHOULD BE COVERED WITH ANCHORED PLASTIC SHEETING.DEPENDING ON THE CONSTRUCTION PROGRESS, THERE MAYBE A NEED TO TEMPORARILY DELAY WORK AT THE SITE IFHEAVY RAINFALL IS FORECAST. TEMPORARY WORK DELAYSDURING CONSTRUCTION WILL BE EVALUATED ON ACASE-BY-CASE BASIS THROUGH OBSERVATION OF SITECONDITIONS BY ZIPPER GEO ASSOCIATES IN COORDINATIONWITH THE CONTRACTOR.3.CONSTRUCTION EROSION CONTROL MEASURES MUST BE INPLACE AND APPROVED BY THE ENGINEER AND CITY PRIOR TOANY EARTH DISTURBANCE.4.THE IMPLEMENTATION OF THE TEMPORARY EROSION ANDSEDIMENT CONTROL (TESC) PLANS AND THE CONSTRUCTION,MAINTENANCE, REPLACEMENT AND UPGRADING OF THE TESCFACILITIES IS THE RESPONSIBILITY OF THE CONTRACTORUNTIL ALL CONSTRUCTION IS APPROVED AND SITE ISPERMANENTLY STABILIZED.5.THE CONTRACTOR SHALL PROVIDE AND MAINTAINTEMPORARY SEDIMENTATION COLLECTION FACILITIES TOENSURE THAT SEDIMENT-LADEN WATER DOES NOT ENTERTHE PUBLIC DRAINAGE SYSTEM. AS CONSTRUCTIONPROGRESSES AND UNEXPECTED (SEASONAL) CONDITIONSDICTATE, MORE TEMPORARY SEDIMENTATION COLLECTIONFACILITIES MAY BE REQUIRED TO PREVENT VIOLATINGAPPLICABLE WATER STANDARDS. THEREFORE, DURING THECOURSE OF CONSTRUCTION IT SHALL BE THE OBLIGATIONAND RESPONSIBILITY OF THE CONTRACTOR TO ADDRESS ANYNEW CONDITIONS THAT MAY BE CREATED BY THEIRACTIVITIES AND TO PROVIDE ADDITIONAL FACILITIES THATMAY BE NEEDED TO PROTECT ADJACENT PROPERTIES.6.THE TESC FACILITIES SHOWN ON THESE PLANS MUST BECONSTRUCTED IN CONJUNCTION WITH ALL CLEARING ANDGRADING ACTIVITIES, AND IN SUCH A MANNER AS TO ENSURETHAT SEDIMENT-LADEN WATER DOES NOT LEAVE THE SITE,ENTER THE DRAINAGE SYSTEM, OR VIOLATE APPLICABLEWATER STANDARDS.7.NO SEDIMENT SHALL BE TRACKED INTO THE STREET ORPAVED SURFACES. SEDIMENT SHALL BE REMOVED FROMTRUCKS AND EQUIPMENT PRIOR TO LEAVING THE SITE. IN THEEVENT OF FAILURE OF THE EROSION CONTROL SYSTEMRESULTING IN SEDIMENT BEING TRACKED ONTO PAVEDSURFACES, THE CONTRACTOR SHALL IMMEDIATELYIMPLEMENT MEASURES TO CORRECT THE SITUATION, ANDVACUUM STREET SWEEPING SHALL BE EMPLOYED ON ANEMERGENCY BASIS. IF VACUUM STREET SWEEPING VEHICLESARE UTILIZED, THEY SHALL BE OF THE TYPE THAT REMOVESTHE SEDIMENT FROM THE PAVEMENT. WASHING OF THESTREETS WILL NOT BE ALLOWED WITHOUT PRIOR CITY OFRENTON APPROVAL.8. AREAS NOT WORKED FOR MORE THAN 2 DAYS SHALL BECOVERED WITH ANCHORED PLASTIC SHEETING.PART 1 - GENERAL CONT.9.NO SEDIMENT SHALL BE ALLOWED TO ENTER ANY CATCHBASIN WITHIN THE SITE, OR ADJACENT PROPERTIES. IN THEEVENT OF A FAILURE OF THE TESC PLAN THAT RESULTS INSEDIMENT ENTERING A CATCH BASIN, THE CONTRACTORSHALL REMOVE ALL SUCH SEDIMENT IMMEDIATELY.10.DISTURBED SOILS THAT ARE EXPOSED TO SURFACE RUNOFFSHALL BE IMMEDIATELY STABILIZED WITH TESC MEASURESAND APPROVED BY THE ENGINEER AND CITY.11.THE TESC FACILITIES SHALL BE INSPECTED DAILY BY THECONTRACTOR AND MAINTAINED AS NECESSARY TO ENSURETHEIR CONTINUED FUNCTIONING.12.CATCH BASINS IN THE STREET SHALL BE INSPECTED BY THECONTRACTOR DAILY. WATER LEAVING THE SITE DURINGCONSTRUCTION, INCLUDING WATER CARRIED BY TRUCKS,SHALL BE CLEAN. THE CONTRACTOR SHALL CLEAN CITYCATCH BASINS AND IMPLEMENT EXTRA SEDIMENTATIONCONTROL MEASURES IF NECESSARY AND AS DIRECTED BYTHE CITY OF RENTON INSPECTOR/DOE INSPECTOR AT NOADDITIONAL EXPENSE TO OWNER.13.THE TESC FACILITIES SHALL BE MAINTAINED UNTILPERMANENT EROSION CONTROL (REVEGETATION WITHTREES, SHRUBS, GROUND COVER, ETC.) PER THEAPPOROVED PLANS IS IN PLACE.14.WHERE SEEDING FOR TEMPORARY EROSION CONTROL ISUSED, FAST GERMINATING GRASSES SHALL BE APPLIED ATAN APPROPRIATE RATE.15.WHERE STRAW MULCH FOR TEMPORARY EROSION CONTROLIS USED, IT SHALL BE APPLIED AT A MINIMUM THICKNESS OFTWO INCHES.16.THE CONTRACTOR IS SOLELY RESPONSIBLE FOR ALL MEANSAND METHODS AND SEQUENCING OF TESC MEASURES ANDENSURING WATER QUALITY REQUIREMENTS ARE MET.PART 2 - TEMPORARY EXCAVATION STABILITY1.A TEMPORARY EXCAVATION WILL BE REQUIRED TO REMOVELOOSE SOIL FROM AN AREA IN THE SOUTHERN PORTION OFTHE SLOPE. TEMPORARY EXCAVATION SLOPE STABILITY IS AFUNCTION OF MANY FACTORS, INCLUDING: GROUNDWATERSEEPAGE, THE TYPE AND DENSITY OF THE VARIOUS SOILSTRATA, THE DEPTH OF CUT; SURCHARGE LOADINGSADJACENT TO THE EXCAVATION, AND THE LENGTH OF TIMETHE EXCAVATION REMAINS OPEN.2.AS THE CONTRACTOR IS CONTINUOUSLY PRESENT AT THESITE AND ABLE TO CONTINUOUSLY OBSERVE SITECONDITIONS, THE CONTRACTOR SHOULD BE RESPONSIBLEFOR MAINTENANCE OF SAFE SLOPES AND WORKER SAFETY.WE RECOMMEND THE CONTRACTOR CONTINUOUSLYOBSERVE TEMPORARY EXCAVATIONS FOR INDICATIONS OFINSTABILITY SUCH AS SOIL SLUMPS, GROUNDWATERSEEPAGE AT THE SURFACE OF THE SLOPE, AND CRACKS ORDOWN SETTING OF THE GROUND SURFACE AT THE TOP OFTHE SLOPE OR ALONG ANY PORTION OF THE SLOPE. IF SIGNSOF INSTABILITY ARE OBSERVED, THE CONTRACTOR SHALLSTOP WORK AND CONTACT ZIPPER GEO ASSOCIATESIMMEDIATELY FOR FURTHER OBSERVATION ANDRECOMMENDATIONS.3.ZIPPER GEO ASSOCIATES (ZGA) SHALL PROVIDE PERIODICOBSERVATION OF GRADING AND RESTORATION AS ITPROCEEDS. ZGA SHALL OBSERVE THE SITE AND TEMPORARYEXCAVATIONS IMMEDIATELY AFTER A RAINFALL EVENTTOTALING 0.5 INCHES OR MORE IN A 24 HOUR PERIOD.TEMPORARY PLASTIC COVERINGCATCH BASIN INSERTDESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTSNOT TO SCALE
SDSDSDSDSDCB 132700 RIM = 44.13'IE 12" RCP NE, SE = 42.21'SD
SDSDSDINSTALL 53 LF OF NEW 4"DIA. PERFORATED DRAINPIPE TRENCH DRAIN PERDETAIL 1, SHT. C3.3CONNECT NEW 4" DIA. PERFPIPE TO EXST. CB 132700IE = 43.0'3' OFF ASPHALT EDGEIE = 43'CAP ENDIE = 43'CAP ENDIE = 43.0'UPON COMPLETION OF RETAININGWALLS, INSTALL ECBVERDYOL C32 BLONG TERM EROSION CONTROLBLANKET ON SLOPE BELOW WALL 1 ANDPLANTINGS PER LANDSCAPING PLAN.SEE DETAILS ON SHT. C3.3.SECTION A-A'SEE THIS SHEET3'5' (ȭ PILE TO ȭ PILE)WALL 2F.G. @ T.W. ELEV. 62.5'F.G. @ B.W. ELEV. 58.5'WALL 1F.G. @ T.W. ELEV. 58.5'F.G.@B.W. ELEV. 54.5' (MIN.)EXST. 1' TO 2'ROCKERY3' MIN.TOP OF SLOPE ~ ELEV. 62.5'EDGE OF PAVEMENTEXST. GRADE. INSTALL LONGTERM EROSION CONTROLBLANKET BELOW WALL 1 (TYP)SEE DETAILS ON SHT. C3.3PL5055606545SECTION A - A'EXISTING ROCKERYTO REMAINPIN PILE RET. WALL 2PIN PILE RET. WALL 1PROPOSED FLAT BENCHW/ PLANTINGS7' MIN.GALVANIZED 2 12 " DIA. XHA53 GRADE B PILES (TYP.)~5'INSTALL NEW PERFORATEDDRAIN PIPE PER THIS SHT.AND DETAIL 1, SHT. C3.31" = 5'*SEE ADDITIONALDETAILS ON SHTS.C3.1 - C3.24' MAX.4' MAX.3'3' MIN.45+ $&7,9(:('*(
PROPOSED 3' GENTLYSLOPING BENCH W/PLANTINGS7' MIN.PLAN VIEWDESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTSAS SHOWNAPPROXIAMTE SCALE IN FEET051010
SECTION DETAILWALL 2PIN PILE RET. WALL 11' MIN.INSTALL MIRAFI G100WDRAINAGE COMPOSITE ONBACK FACE OF LAGGING PRIORTO BACKFILLING W/FILTERSIDE TOWARDS SOIL.PROVIDE 18" GAPBETWEEN LAGGING TOPROMOTE DRAINAGE.TUCK DRAINAGE FABRIC UNDERLAGGING AND EXTEND 6" MIN. BEYONDLAGGING FACE3' (TYP.)REMOVE AND REPLACE NATIVE SOILSWITH 1-14" CRUSHED ROCKBENCH CUT NATIVE SOILSPRIOR TO PLACING WALL 1BACKFILL1' (TYP.)NATIVE SOIL BACKFILLPLACED IN 6" LOOSE LIFTSAND COMPACTED WITHHAND-TAMPERPROVIDE 18" GAP BETWEEN LAGGING TOPROMOTE DRAINAGE. SEE WALL 2GAPPING DETAIL, THIS SHT.2"X10" TIMBERLAGGINGSTRIPS OF FOLDED MIRAFI 140N FILTERFABRIC SANDWICHED BETWEENLAGGING BOARDS18" LAGGING GAPGALVANIZED 2 12 " DIA. XHA53 GRADE B PILES (TYP.)2 X 10 PRESSURETREATED HEM-FIR NO. 2OR BETTER TIMBERLAGGING (TYP.)WALL 2 LAGGING GAP DETAIL6" MIN. THICKNESS 1-14"CRUSHED ROCK (TYP.)6" MIN. (TYP.)6" MIN. (TYP.)U-BOLTS (TYP.)COMPACT NATIVE SOIL SUBGRADE INFRONT OF WALL 26" (TYP.)6" (TYP.)2-1/2" SCHD. 80 CAP.ADHERE TO PILE USING ANAPPROPRIATE CONSTRUCTIONADHESIVE (TYP.)COMPRESSION FITTED SLEEVEDCOUPLERS (TYP.) COUPLERS SHALL BELOCATED AT LEAST 4 FEET BELOWFINISHED GRADE (TYP.)4' MIN.EROSION CONTROLBLANKETDESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTS-
U-BOLT DETAIL3/8" (DIA.) X 3" (W) X 5-1/2" (L) (MIN)HOT DIPPED GALVANIZED U-BOLT(SIZED FOR 2-1/2" DIA. PIPE)3/8" GALVANIZED LOCK WASHER3/8" x 1" GALVANIZED FLAT WASHER~4-3/8"2X PT LAGGINGGALVANIZED NUTGALVANIZED 2 12 " DIA. XH A53 GRADE BPILES (TYP.)FINISHED GRADE ATBOTTOM OF WALLFINISHED GRADE AT TOP OFWALL2 X 10 PRESSURE TREATEDHEM-FIR NO. 2 OR BETTERTIMBER LAGGING (TYP.)FACE ON VIEW (TYP.)8" (TYP.)4' (TYP.)3' - 4" (TYP.)GALVANIZED 2 12 "DIA. XH A53 GRADEB PILES (TYP.)U-BOLTS (TYP.)MIRAFI DRAINAGE COMPOSITEBEHIND LAGGING (TYP. WALL 1ONLY)RETAINED SOIL / BACK OF WALLFACE OF WALL2 X 10 PRESSURE TREATED HEM-FIR NO.2 OR BETTER TIMBER LAGGING (TYP.) GALVANIZEDU-BOLT PER DETAIL3, THIS SHT.(TYP.)8" (TYP.)TOP VIEW (TYP.)3' - 4" (TYP.)4' (TYP.)GALVANIZED 2 12 " DIA. XH A53GRADE B PILES (TYP.)GENERAL NOTESDESIGN LOADS1.~43 PCF EQUIVALENT ACTIVE FLUID EARTH PRESSURE.SPECIAL INSPECTION1.SPECIAL INSPECTIONS ARE REQUIRED AS INDICATED IN THEFOLLOWING TABLE. THE CONTRACTOR SHALL SUBMIT AWRITTEN STATEMENT OF RESPONSIBILITY TO THE BUILDINGOFFICIAL AND OWNER PRIOR TO COMMENCEMENT OF WORKIN ACCORDANCE WITH CHAPTER 1704.4 OF THE IBC2.INSPECTION REPORTS SHALL BE PROVIDED FOR EACH DAYON SITE BY GEOTECHNICAL ENGINEER. REPORTS SHALL BEDISTRIBUTED TO THE CONTRACTOR AND BUILDING OFFICIAL.3.ALL ITEMS MARKED WITH AN "X" SHALL BE INSPECTED INACCORDANCE WITH IBC CHAPTER 17. SPECIAL INSPECTIONSHALL BE PERFORMED BY THE GEOTECHNICAL ENGINEER(ZIPPER GEO ASSOCIATES, LLC).PIPE PILES1.PIPE PILES SHALL BE 2-1/2 INCH DIAMETER XH A53 GRADE B(35 KSI YIELD STRENGTH).2.PIPE PILES SHALL BE HOT DIPPED GALVANIZED INACCORDANCE WITH ASTM A123 AT A MINIMUM APPLICATIONRATE OF 2 OZ./SF.3.GALVANIZATION DAMAGE SHALL BE REPAIRED INACCORDANCE WITH ASTM A780. REPAIRED AREAS SHALLHAVE A MINIMUM DRY FILM THICKNESS OF 4 MILS.4.PIPE PILES SHALL BE DRIVEN TO THE MINIMUM EMBEDMENTDEPTH AS SHOWN ON THE PLANS. PILES TO BE DRIVEN INNOMINAL SECTIONS AND CONNECTED WITH COMPRESSIONFITTED SLEEVED COUPLERS.STEEL HARDWARE1.STEEL HARDWARE INCLUDING UBOLTS, NUTS, AND WASHERSSHALL BE ASTM A307 GALVANIZED IN ACCORDANCE WITHASTM A153.TIMBER LAGGING1.TIMBER LAGGING SHALL BE 2 X 10 PRESSURE TREATEDHEM-FIR NO. 2 OR BETTER TIMBER. TREATMENT SHALL BE INACCORDANCE WITH AWPA USE CATEGORY UC4A. LAGGINGCUTOFFS SHALL BE FIELD-TREATED BY TWO LIBERALAPPLICATIONS OF A COPPER NAPHTHENATE PRESERVATIVE.THE APPLICATION SHALL BE PER AWPA STANDARD M4.OPERATIONCONT.PERIODICREMARKSPILE INSTALLATIONXGEOTECHENGINEERLAGGINGINSTALLATIONXGEOTECHENGINEEREXCAVATION ANDBACKFILLINGXGEOTECHENGINEEREROSION CONTROLXGEOTECHENGINEERDESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTS-
4" TOPSOIL4" DIA. PERFORATEDDRAINAGE PIPE WITHPERFORATIONS FACING DOWN2' (TYP.)2'1' MIN.MIRAFI 140N NON-WOVENGEOTEXTILEGRAVEL BACKFILL FORDRAINS PER SECTION9-03.12(4), WSDOT STANDARDSPECS.TRENCH DRAIN DETAIL1.Prepare soil before installing rolled erosioncontrol products (RECPs), including anynecessary application of lime, fertilizer, andseed.2.Begin at the top of the slope by anchoring theRECPs in a 6" deep X 6" wide trench withapproximately 12" of RECPs extendedbeyond the up-slope portion of the trench.Anchor the RECPs with a row ofstaples/stakes approximately 12" apart in thebottom of the trench. Backfill and compactthe trench after stapling. Apply seed to thecompacted soil and fold the remaining 12"portion of RECPs back over the seed andcompacted soil. Secure RECPs overcompacted soil with a row ofstaples/stakes spaced approximately 12"apart across the width of the RECPs.3.Roll the RECPs (A) down or (B) horizontallyacross the slope. RECPs will unroll withappropriate side against the soil surface. AllRECPs must be securely fastened to soilsurface by placing staples/stakes inappropriate locations as shown in the staplepattern guide.4.The edges of parallel RECPs must be stapledwith approximately 2" - 5" overlap dependingon the RECPs type.5.Consecutive RECPs spliced down the slopemust be end over end (Shingle style) with anapproximate 3" overlap. Staple throughoverlapped area, approximately 12" apartacross entire RECPs width.2"-5"3B42513A12"6"6"3"ANCHORAGE DEVICES SHALLCONSIST OF 12" WOOD ECOSTAKES OR TL-TA1 12" TWISTPINS. INSTALL INACCORDANCE WITHMANUFACTURER'SRECOMMENDATIONS.EROSION CONTROL BLANKET INSTALLATIONEROSION CONTROL BLANKET ANCHORAGENOTE: INSTALL EROSION CONTROL BLANKET, PLANTING, ANDSEEDING IN ACCORDANCE WITH ECB MANUFACTURER'SRECOMMENDATIONS.DESIGNED:SCALE:CHECKED:DRAWN:DATE:SHEETJOB NO.OFBYDESCRIPTIONDATENO.PLOT DATE:DRAWING19019 36th Avenue West, Suite E |Lynnwood, WA 98036PH: (425) 582-9928 | Fax: (425) 582-9930 | www.zippergeo.comSUBMITTAL RECORD8/26/19LAST EDIT:RobZ:\Projects\2001 - 2050\2041 McCarthy Residence\2041.01 McCarthy Residence\Working File\Drafting\2041.01 Plans REV 3.dwgRAR4/25/19-INITIAL RELEASE6MCCARTHY RESIDENCE SLOPE STABILIZATION3403 BURNETT AVENUE NORTHRENTON, WASHINGTON8/8/192041.01TAJRARRARRAR7/25/19-REDESIGN W/PIN PILE WALLS - INITIAL RELEASE8/26/19RAR8/8/191REVISED PER CITY REVIEW COMMENTSRAR8/26/192REVISION TO ADDRESS PLANNING COMMENTSNOT TO SCALE