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Home My WebLink AboutGeological Assessment - GEO Geological Review - 12/1/2006 (2) GEOLOGICAL ASSESSMENT 31 EAST MERRIMOUNT ROAD UNION, WASHINGTON PREPARED FOR DOGWOOD CONSTRUCTION, INC. BY GEOTECHNICAL TESTING LABORATORY OLYMPIA, WASHINGTON DECEMBER 1 , 2006 GEOTECHNICAL TESTING LABORATORY CONTACT INFORMATION PREPARER INFORMATION GTL PROJECT NUMBER: 06-2971-11 CONTACT: LANCE LEVINE ADDRESS: 10011 BLOMBERG STREET SOUTHWEST OLYMPIA,WASHINGTON 98512 TELEPHONE: (360)754-4612 FACSIMILE: (360)754-4848 EMAIL ADDRESS: GEOTESTLAB@COMCAST.NET CLIENT INFORMATION CLIENT: DOGWOOD CONSTRUCTION,INC. CONTACT: ROB MCGUIRE TELEPHONE: (360)898-6100 FACSIMILE: (360)898-6102 MAILING ADDRESS: 90 EAST TOWER LANE UNION,WASHINGTON 98592 SITE ADDRESS: 31 EAST MERRIMOUNT LANE UNION,WASHINGTON 98592 PARCEL NUMBER: 322355201007 GPS LOCATION: N47" 21.286' W1230 01.010' 10011 Blomberg Street SW, Olympia, WA 98512 2 Phone#: (360)754-4612 Fax#: (360) 754-4848 GEOTECHNICAL TESTING LABORATORY SCOPE OF UNDERSTANDING DOGWOOD CONSTRUCTION,INC. 90 EAST TOWER LANE UNION,WASHINGTON 98592 RE: GEOLOGICAL ASSESSMENT SITE INFORMATION: 31 EAST MERRIMOUNT LANE UNION,WASHINGTON 98592 GPS LOCATION: N470 21.2861 W1230 01.0101 PARCEL NUMBER: 322355201007 Mr.McGuire: As per your request, we have conducted a geological assessment and analysis for the above-mentioned parcel. A site reconnaissance was performed on November 27, 2006. The results of this investigation are to be found in the following assessment. We have provided three copies for your review and distribution. We are also a full service laboratory that can meet all your building, testing(compaction, asphalt, concrete), and inspection needs. We appreciate this opportunity to be of service to you and we look forward to working with you in the future. If you have any questions concerning the above items, the procedures used, or if we can be of any further assistance please call us at the phone number listed below. Respectfully Submitted, r-- GEOTECHNICAL TESTING LABORATORY Was Harold Parks, L.G., L.E.G. Senior Engineering Geologist 60 HAROLD PARKS 10011 Blomberg Street SW, Olympia, WA 98512 3 Phone#: (360)754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY TABLE OF CONTENTS CONTACT INFORMATION SCOPE OF UNDERSTANDING................................................................................................................ TABLEOF CONTENTS............................................................................................................................. 4 PURPOSE....................................................................................................................................................... 5 SITECONDITIONS.......................................................................................................................................... 5 GEOLOGICCONDITIONS................................................................................................................................. 6 GROUNDWATERCONDITIONS........................................................................................................................ 7 DEPTHTO COMPETENT SOIL.......................................................................................................................... 7 PASTSLOPE INSTABILITY.............................................................................................................................. 8 HISTORY OF LANDSLIDE ACTIVITY................................................................................................................ 9 POTENTIAL FOR LANDSLIDE ACTIVITY.......................................................................................................... 9 RECOMMENDATIONS................................................................................................................................... 10 VICINITYMAP............................................................................................................................................. 11 10011 Blomberg Street SW,Olympia, WA 98512 4 Phone#: (360)754-4612 Fax#: (360) 754-4848 GEOTECHNICAL TESTING LABORATORY PURPOSE The objective of the geological assessment is to assess the surface and subsurface conditions prevalent at the subject site according to Mason County Critical Areas Ordinance 17.01.100.E4. We understand the parcel will be re-developed by raising the existing structure one(1)story to create the new lower level. A new addition(6 by 20 feet) will be added to the western side of the existing single-family residence. At the proposed/existing building location,the slope ranges from 25 to 36 percent. Hence, Mason County requires a geological assessment. .p r 4 SITE CONDITIONS The subject site is located approximately 3.5 miles east of the center of Union, Washington. The parcel is located in an area of moderate residential development, see the vicinity map following this report. The site is currently bounded by roads on the north, west, and south sides. A residential parcel is to the east. Access occurs from the existing driveway along the western portion of the site. Slope angles on this site range from 25 to 36 percent at the building location. The overall slope is approximately 31 percent. The lot is mostly vegetated with the salal, Oregon grape, sword ferns, blackberry, huckleberry, bracken ferns, rhododendron as well as hemlock, cedar, maple, alder, and fir trees. Surface water was not observed onsite. The roadside ditch along the north and west property lines exhibited signs of previous surface water. No slope instability was observed at or around the proposed building location. Onsite and surrounding trees are straight and vertical. • +f ,f 1001 1 Blomberg Street SW', Olympia, WA 98512 5 Phone#: (360) 754-4612 Fax#: (360) 754-4848 GEOTECHNICAL TESTING LABORATORY GEOLOGIC CONDITIONS The Soil Survey of Mason County, Washington, USDA Soil Conservation Service(1960)has mapped the site soils as an Alderwood gravelly sandy loam,30 to 45 percent slopes(Ad),at the site. The report reads: The Alderwood soils typically formed from gravelly glacial till. They are described as having good natural drainage. Typically, there is no occurrence of a high water table. Internal drainage is described as medium. An erosion hazard may exist if the vegetation is removed. h � t AL The Geologic Map of Washington—Northwest Quadrant(2002) has mapped the site geology as advance outwash deposits(Qga)of continental glacial origin. The report reads: Advance outwash — Glaciofluvial sand and gravel and lacustrine clay, silt, and sand deposited during the advance of glaciers; sandy units commonly thick, well sorted, and fine grained, with interlayered coarser sand, gravel, and cobbles; locally contains nonglacial sediments and deposits mapped as transitional between glacial and nonglacial. Includes the Colvos and Esperance Sand Members of the Yashon Drift and part of the Yashon Drift undivided. The Geologic Map of the Shelton 1:100,000 Quadrangle, Washington, by Logan (2003) describes the site as glacial advance outwash(Qga). The glacial advance outwash is described as: Advance outwash, late Wisconsinan (Pleistocene)— Glaciofluvial sand and gravel and lacustrine clay, silt, and sand deposited during the advance of glaciers; sandy units commonly thick, well sorted, and fine grained, with interlayered coarser sand, gravel, and cobbles and silt rip-up lag deposits at their base; may contain nonglacial sediments; generally overlain by till. _ 'It_. ' The Geologic Map of Southeastern Mason County, Washington, USGS Water-Supply Bulletin 29 by Noble and Molenaar(1970)describes the site as advance outwash. The advance outwash(Qva) is described as: Gravel and sand, with some silt and clay at base. Unconsolidated and generally is in discontinuous strata. Underlies till in most of area and up to 200 feet thick. Yields moderate to large quantities (20-800 gp.m) of water where gravel and coarser sand facies below water table. 10011 Blomberg Street SW,Olympia, WA 98512 6 Phone#: (360)754-4612 Fax#: (360) 754-4848 GEOTECHNICAL TESTING LABORATORY Y r � GROUNDWATER CONDITIONS Groundwater seepage was not observed at or near the building location. Wetland vegetation was not observed at or near the building location. Research of the local wells indicates that depth to static groundwater is relatively deep and beyond the scope of this report. Drinking water can be expected as deep as 460 feet. DEPTH TO COMPETENT SOIL The building location is underlain by Vashon glacial outwash material. This cemented and very competent material was observed at approximately 18 inches below the existing ground surface. r a A ;r�s F ZSFy 10011 Blomberg Street SW,Olympia, WA 98512 7 Phone#: (360)754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY ' .. � 'fir. ' � '• �, ��'..� , t �� .r L 1 A PAST SLOPE INSTABILITY Near the building location, trees were observed to be straight and vertical. No indication of past instability was discerned at the building location or throughout the site. At the building location, the slope is between 10 and 25 percent. k ,y AA s' ' r Y ,�•'��.era -f �R ;5i.•'- :try,... . - .q' ! i 1 � 10011 Blomberg Street SW,Olympia,WA 98512 Phone#: (360)754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY HISTORY OF LANDSLIDE ACTIVITY Slumping or sliding was not observed throughout the site. At the proposed building location,the slope is compact and dense with no indication of previous landsliding. The onsite trees are straight and vertical. A - r r POTENTIAL FOR LANDSLIDE ACTIVITY Even though slopes approach 36 percent onsite, the potential for landslide activity is not a concern for the proposed construction. The onsite and offsite slopes are not a concern for potential landslide activity. The subject site and surrounding areas are well vegetated with moderate slopes. The Liquefaction Susceptibility Map of Mason County, Washington by Palmer, Magsino, Poelstra, Bilderback, Folger,and Niggemann(September 2004)maps the site area as having a very low to low liquefaction potential. The Site Class Map of Mason County, Washington by Palmer, Magsino, Bilderback, Poelstra, Folger, and Niggemann (September 2004) maps the site area as site class C to D. Site class C is a very stiff soil or soft rock and site class D is a stiff soil. The Relative Slope Stability of the Southern Hood Canal Area, Washington, (1977)describes the site area as Class 2. Class 2 is described as: Areas believed to be stable under normal conditions, but may become unstable if disturbed by man's activities, if slope is oversteepened by erosion, or if subjected to strong seismic shaking. Slopes generally steeper than 15 percent, but may be less in some areas of weak geologic materials. Includes areas underlain by: well-drained sand and gravel, mostly on valley sides that lack known slope failures;glacial till with steep slopes;and bedrock. 10011 Blomberg Street SW, Olympia, WA 98512 9 Phone#: (360) 754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY RECOMMENDATIONS There is no evidence of soil erosion or deposition onsite to suggest that the site should be included in the Erosion Hazard Area designation. Site conditions for the development do not warrant a more comprehensive Geotechnical Report. We recommend no further action is needed unless areas of concern are unearthed during construction or damage ensues from vegetation clearing. To minimize erosion and sedimentation, we recommend that vegetation remain or be cultivated in areas outside the building location. If there are any changes in the loads, grades, locations, configurations or types of facilities to be constructed, the conclusions and recommendations presented in this report may not be fully applicable. If such changes are made, we should be given the opportunity to review our recommendations and provide written modifications or verifications,as appropriate. Changes to the Mason County Code require our firm to revisit the subject site prior to development, if six months has elapsed,to ensure the conditions are in agreement with our original report. f M 10011 Blomberg Street SW,Olympia, WA 98512 10 Phone#: (360) 754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY VICINITY MAP •"' OCLk 24 004 Shady TDPU l4 �L� °arr /y •i--+"— �r .r -lam 1 ~.�i ( o r=o r 161 POiIKf THE Sri' *° nr °M iY v° / �E ;tri k i 10011 Blomberg Street SW, Olympia, WA 98512 1 l Phone#: (360)754-4612 Fax#: (360) 754-4848 Dec 08 06 09:05a Dogwood 3608986102 p.1 DOGWOOD CONSTRUCTION, INC. New Construction ' Remodels " Garages ' Repairs DOGWOC 199OR4 90 E TOWER LN , Union,WA 98592 (360)898-6100 ` Cell(360)490-1941 FAX(360)898-6102 DOGWOODLHCTC.COV I CONSTRUCTION AGREEMENT DATE: 12/01/2006 BILL TO: ROY CORREA SITE: 31 EAST MERRIMOUNT 7015 78th AVE SE UNION, WA MERCER ISLAND, WA 98040 PHONE: 898-2982 AS PER PLANS PREPARED BY DAVID MACKEY HOME: (206)232-8596 ARCHTECTURAL DESIGN DATED 09-15-06 E-MAIL'. rj-curo@ao.com No Charge GEOTECHNICAL REPORT AS REQUIRED BY COUNTY No Charge MASON COUNTY BUILDING PERMIT (We will cover this added expense.) Pam Description DEMOLITION ELECTRICAL DEMO e DISCONNECT ELECTRICAL SERVICE > NEW PANEL @ NEW LOCATION DEMO e EXISTING MAST & BREAKER TO BE REMOVED BY ELECTRICIAN OWNER NEW ELECTRICAL - FIXTURES (LIGHTS)ALLOWANCE OWNER NEW HEATING FRAMER $266 DEMO f REMOVE ENTRYWAY DOORS &WALLS $1,064 DEMO f REMOVE BEDROOM &STUDY-SOUTH WALL $266 DEMO f REMOVE EXISTING DOOR IN STUDY& PATCH TO MATCH $399 DEMO f CUT NEW ROUGH OPENING INTO STUDY $399 DEMO If CUT NEW ROUGH OPENING FROM MASTER BEDROOM TO NEW BATHROOM $133 DEMO f REMOVE DECK STEPS& GATE ASSEMBLY $133 DEMO f REMOVE FRONT DECK STEP inc DEMO f REMOVE EXISTING SUPPORTS & FOOTINGS inc DEMO f REMOVE ALL GLAZING SASHES & FIXED PANELS $2,128 DEMO If DO NOT DISTURB EXISTING CEILING SUPPORT ASSEMBLY PLUMBER $4,025 DEMO p REMOVE EXISTING SHOWER UNIT&TERMINATE ALL CONNECTIONS inc DEMO p REMOVE EXISTING WATER HEATER & TERMINATE ALL CONNECTIONS inc DEMO p =save water heater for possible reinstallation inc DEMO p CAP SEWER&WATER CONNECTIONS inc Al p ROUGH-IN PLUMBING FOR NEW MASTER BATHROOM inc Al p ROUGH-IN PLUMBING IN EXISTING BATHROOM FOR SHOWERIWASHING MACHINE inc A6 p EXTEND ALL EXISTING& NEW WASTE VENTS & FAN DUCT OUTLETS inc PLUMBING FINISH -ALL LABOR TO SET TRIM Page t of 3 Pages CONSTRUCTION AGREEMENT Correa 121712GOG Dec 08 06 09:05a Dogwood 3608986102 p.2 TREE REMOVAL $2,294 DEMO REMOVE LARGE FIR TREE IN DRIVEWAY; REMOVE (2) CEDAR TREES BESIDE inc HOUSE; CLEAN UP DEBRIS AND GRIND FIR TREE STUMP. TAKE DOWN (1) inc SMALL FIR AND (1) CEDAR NEAR FUTURE GARAGE AREA. (TREES ARE MARKED WITH PINK PAINT) HOUSE LIFT $24,000 DISCONNECT ELECTRICITY, WATER, SEWER & CAP OFF inc LIFT & BRACE HOUSE inc LOWER HOUSE ONTO NEW FOUNDATION FOUNDATION PLAN $4.048 A2 BACKFILL, PEE GRAVEL & FINAL GRADE FOR HOUSE ONLY $14,350 A4 ENGINEERED CONCRETE, FOUNDATION TO CODE, REBAR & PUMPS inc A4 > TO INCLUDE SLAB IN CRAWL SPACE (3 CU YD), ENTRYWAY inc A4 > RETAINING WALL& EAST ENTRYWAY PAD (4 CU YD) inc A4 > ???ANY NEW PIERS TO BE POURED ??? inc A4 NEW BEAMS(4) $594 A4 NEW STRINGER FOR DECK STAIRS A4 EXCLUDES ANY MATERIALS FOR GARAGE/CARPORT MAIN FLOOR PLAN $5,578 Al f REPLACE ALL EXISTING WINDOW SASHES WITH MILGARD WINDOWS $1,065 Al f REPLACE EXISTING PATIO DOOR WITH MILGARD PATIO DOOR $325 Al f INSTALL SOLAR TUBE IN FOYER $325 Al f INSTALL SOLAR TUBE IN NEW MASTER BATHROOM S2,128 A2 f SIDING TO MATCH EXISTING HOUSE $3,634 Al I INSULATE ALL INTERIOR & EXTERIOR WALLS FRAMING PLAN $9,343 A2 FRAME PONY WALL ON UNDERSTRUCTURE inc A5 REPLACE ALL DECK BRACING inc A5 ??? REPLACE BEAM SUPPORTS ??? $7,765 A4 FRAME NEW ADDITION FROM FOUNDATION THROUGH ROOF SHEETING $1,064 A4 FRAME NEW ENTRYWAY &CLOSET $798 A4 FRAME NEW MASTER BATHROOM $798 A4 FRAME NEW STAIRS OFF NORTHERN DECK $1,725 A4 FRAME IN (2) NEW ENTRY DOORS ROOF PLAN $2,128 DEMO f REMOVE ROOF MEMBRANE SYSTEM $13,009 A3.2 INSTALL ENGINEERED SCISSOR TRUSSES OVER LIVING ROOM $5,320 A32 INSTALL ENGINEERED TRUSSES OVER REMAINING HOUSE inc A2 MATCH FINISHES & COVERINGS TO EXISTING HOUSE inc A6 ICE & WATER SHIELDS INSTALLED IN VALLEYS ?? ? A6 EXISTING RATED CHIMNEY SYSTEM TO BE EXTENDED Pa3e 2 of 3 Psges CONSTRUCTION AGREEMENT Correa 12M2006 Dec 08 06 09:05a Dogwood 3608986102 p.3 INTERIOR WORK $5.578 ROUGHIN ELECTRICAL- INSTALL NEW 200 AMP SERVICE, NEW GROUNDING inc & BONDING SYSTEM TO ALL METALLIC LINES, BRING EXISTING ROOMS UP inc TO CODE, REWIRE EXISTING BATHROOM, WIRE NEW BATHROOM, REWIRE inc EXISTING LIGHTING IN HALLWAY& BEDROOM, AND RELOCATE WATER HEATER. $7,590 ROOFING MATERIAL& LABOR FOR ARCH. COMP. ROOFING $729 CONTINUOUS GUTTERS, DOWNSPOUTS $2,645 SHEETROCKIPLASTER ABOUT 1600 SOFT OF BOARD inc (1) MASTER BEDROOM WALL & LID, (1) GUEST BEDROOM WALL& LID, inc (2) ENTRY WALLS & LID, (1) BATH WALL& LID, (1) SCISSOR TRUSSES IN inc LIVING ROOM ? ? ? CABINET PACKAGE BATH ? ? ? DOOR STYLE-OWNER BATH ? ? LAMINATE -MASTER BATH BATH ? ? ? CARPET??? BED ? r? ? VINYL ??? BED r? ?? MILLWORK??? ? ? ? DOOR KNOBS, TOWEL BARS, TP HOLDERS ? ? ? FINISH LABOR TO INSTALL ALL DOORS, TRIM & WINDOW TREATMENT ?? ? (2) COLORS EXTERIOR PAINT (OWNER TO DO INTERIOR PAINTING) S2,760 CLEAN UP CONSTRUCTION DEBRIS $0 JOBSITE RESTROOM 1$ 4,125 BUILDER OVERHEAD (LIABILITY INSURANCE, L&I, B&O TAX) $142,531 SUBTOTAL 1$ 1,830 TAX $154,361 TOTAL WE CAN START THIS PROJECT SHORTLY AFTER RECEIVING THE PERMIT&ACCEPTANCE OF BID. We are required bylaw to furnish this notice to the owners of all properties to which we deliver materials de supplies,so they may have notice that in the event of non-payment of our account,a materialman's lien may be claimed by us. This notice is not in itself a claim of lien,nor does it imply in anyway that lien may be necessary. It is sent only because we are required by statute to do sa. Rli mal"l is Wwam1ced to be as speoeed.NI NaKt�be c pleted In�euo tal vro kN rgke mannerR—ring to 3s 15CWI—suornttad,par syardard prac9;es Any e Asretan er d—in%or learn above spxfica*—in.W.M p en,cases vAi be--Red BY:Rob McGuire,President onN tFonh%i orders,endvNIbr.;ome ees aWa cha�e saner and above Yte estvrsate. At afire—nis r�ncryant.po,strkaa,�danm or delays toyond w .rjtroj.a.ne. Note: This propcsal may be wrthdrawn by b cenyfae,tornado and atner receasery inwrence 0�i weriem we wn r:o.ered W us if not accepted within days. Nbrkrneee C—Pan-eon Insennce.HOME OvdNER RESPONS13 E FOR COSTOF ALL UTILITIES:I LNtPORARY,PC RTAME,AND PERMANENT ACCEPTANCE OF PROPOSAL The above pnces,specifications Signature and conditions are salisfactory and are hereby accepted. You are authonrred to do the work as specified. payment will be Signature made as out5ned above. Date of acceptance _ Page 3 of 3 Pages CONSTRUCTION AGREEMENT Correa ?nr2o�