Loading...
HomeMy WebLinkAboutGEO Tech Review - BLD Engineering / Geo-tech Reports - 10/26/2007 GEOLOGICAL ASSESSMENT 15 PINE STREET UNION, WASHINGTON PREPARED FOR ANDY MENDENHALL BY GEOTECHNICAL TESTING LABORATORY OLYMPIA, WASHINGTON OCTOBER 26, 2007 GEOTECHNICAL TESTING LABORATORY CONTACT INFORMATION PREPARER INFORMATION GTL PROJECT NUMBER: 07-0605 CONTACT: LANCE LEVINE OR HAL PARKS ADDRESS: 10011 BLOMBERG STREET SOUTHWEST OLYMPIA,WASHINGTON 98512 TELEPHONE: (360)754-4612 FACSIMILE: (360)754-4848 EMAIL ADDRESS: GEOTESTLAB@COMCAST.NET CLIENT INFORMATION CLIENT: ANDY MENDENHALL TELEPHONE: (503)538-1894 CELLULAR TELEPHONE: (503)740-7112 MAILING ADDRESS: 102 WEST 3RD STREET NEWBERG,OREGON 97132 SITE ADDRESS: 15 PINE STREET UNION,WASHINGTON 98592 PARCEL NUMBER: 322325212015 GPS LOCATION: N47°21.0451 W123o 05.7791 #07-0605 10011 Blomberg Street SW,Olympia, WA 98512 2 Phone#: (360)754-4612 Fax#: (360) 754-4848 GEOTEC HNICAL TESTING LABORATORY SCOPE OF UNDERSTANDING ANDY MENDENHALL 102 WEST 31D STREET NEWBERG,OREGON 97132 RE: GEOLOGICAL ASSESSMENT SITE INFORMATION: 15 PINE STREET UNION,WASHINGTON 98592 GPS LOCATION: N47o 21.0451 W 123o 05.7791 PARCEL NUMBER: 322325212015 Mr.Mendenhall: As per your request, we have conducted a geological assessment and analysis for the above-mentioned parcel. A site reconnaissance was performed on October 8, 2007. The results of this investigation are to be found in the following assessment. We have provided three copies for our review and distribution. i g P P Y We are also a full service laboratory that can meet all your building, testing(soils compaction, asphalt, concrete, resteel), and other 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, W a.Sh. GEOTECHNICAL TESTING LABORATORY 17 CO Harold Parks,L.G.,L.E.G. Principal nglneering Geologist 827 d G e �o Hi',FOLD PARKS �:>ef(Qf:S 7-3(-oe 407-0605 10011 Blomberg Street SW,Olympia,WA 98512 3 Phone#: (360) 754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY TABLE OF CONTENTS CONTACT INFORMATION...................................................................................................................... 2 SCOPE OF UNDERSTANDING ................................................................................................................ 3 TABLEOF CONTENTS ............................................................................................................................. 4 PURPOSE ....................................................................................................................................................... 5 SITECONDITIONS.......................................................................................................................................... 5 GEOLOGICCONDITIONS................................................................................................................................. 6 GROUNDWATER CONDITIONS........................................................................................................................ 8 DEPTH TO COMPETENT SOIL.......................................................................................................................... 9 PAST SLOPE INSTABILITY.............................................................................................................................. 9 HISTORY OF LANDSLIDE ACTIVITY.............................................................................................................. 10 POTENTIAL FOR LANDSLIDE ACTIVITY........................................................................................................ 10 RECOMMENDATIONS................................................................................................................................... 11 REPORT LIMITATIONS AND GUIDELINES FOR USE........................................................................................ 11 LABORATORYSAMPLE................................................................................................................................ 13 FIGURE 1,VICINITY MAP ............................................................................................................................ 14 FIGURE2, SITE PLAN................................................................................................................................... 15 #07-0605 10011 Blomberg Street SW, Olympia, WA 98512 4 Phone#: (360) 754-4612 Fax#: (360) 754-4848 i 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.E.4. We understand the parcel will be developed by constructing a single-family residence(daylight basement)and garage. See photo below. The Mason County Resource Ordinance Geologically Hazardous Areas(12-27-2006)contains the following: 17.01.100 Landslide Hazard Areas E. Special Reports 1.Applicability Category d. Development proposed within 300 feet of areas with slopes between 15 percent (8.5 degrees) and 40 percent(21.8 degrees)will require a Geological Assessment. The proposed building location will be located where the slope is approximately 34 percent. Hence, Mason County requires a geological assessment. The subject site is not located within 300 feet of a landslide hazard area (17.01.100.E.4(6)). y$ r Proposed Garage S r �E • Location SITE CONDITIONS The subject site is located approximately 0.25 miles south of the center of Union, Washington. The parcel (0.23 acres) is located in an area of sparse residential development; see the Vicinity Map (Figure 1) following this report. The site is currently bounded by residential parcels on the west and north sides (see aerial photos on next page). A forested parcel is to the east; Pine Street bounds the parcel to the south. See Figure 2 Site Plan. Access will occur from an existing driveway from the southern portion of the site. At the proposed building locations,the slope ranges from 20 to 34 percent. For areas with less than 10 vertical feet of relief, the steepest slope measured onsite is approximately 38 percent along the eastern edge of the existing driveway. The lot is mostly vegetated with Scot's broom, blackberry, foxglove, lupine, and Japanese knotweed as well as cedar trees. Surface water flow was not observed onsite. Minor ponding was observed in a low area that was created during the driveway construction. No slope instability was observed at or around the proposed building locations. Onsite and surrounding trees are straight and vertical. #07-0605 10011 Blomberg Street SW,Olympia,WA 98512 5 Phone#: (360)754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY Mason Count),GIS TerraServer-USA aerial Photo E OpEAT BEMO Op ; AM- •.• ..- ESPRUCES � qV ik GEOLOGIC CONDITIONS The site is generally situated within the Puget Sound glacial upland. Multiple glacial advances deposited the onsite material. The near surface material was deposited during the.most recent Vashon stade (stage) of the Fraser glaciation that occurred between about 9,000 and 11,000 years ago. Weathering and erosion has occurred since. �r The figure (right) is a LiDAR image at a 12-ft. resolution. In the local vicinity, ridgelines trend northeast to southwest. The onsite soils are composed of sandy gravel with minor silt underlain by well cemented and well-graded sandy gravel (glacial till) material (17.01.100.E.4(4)). Fill ' material was observed along the eastern edge of the J existing driveway extending into the central portion of the site (see Figure 2, Site Plan). The fill material is approximately 5 feet thick at the maximum. The proposed ! building locations are located where little to no fill is ";, ` �`, ✓ present. The untested fill material cannot be verified for r' grain-size,moisture, or density(compaction). Offsite to the west, the parcel has an exposure of cemented jw ' and very dense sandy gravel characterized as glacial till : This cut slope stands nearly vertical for a height of 8 feet. Puget Sound LiDAR Consortium Little sloughing was observed at the base of the cut slope. Resources by Rogers and Walsh detailing faults in the Puget Sound were reviewed. No kiiovii iaults are mapped in the vicinity of the subject site(17.01.100.E.4(5)). #07-0605 10011 Blomberg Street SW,Olympia,WA 98512 6 Phone#: (360)754-4612 Fax#:(360)754-4848 GEOTECHNICAL TESTING LABORATORY Published descriptions of the onsite soils are included with this report(17.01.100.E.4(1)). The following geologic excerpts are for the information of the client and not necessarily for the review staff at Mason County. The following photos portray the onsite material. The Geologic Map of Washington — Northwest Quadrant (2002) has mapped the site geology as glacial till deposits(Qgt)of continental glacial origin. The report reads: Till— Unsorted, unstratified, highly compacted mixture of clay, silt, sand, gravel, and boulders deposited by glacial ice; may contain interbedded stratified sand, silt, and gravel. Includes part of the Vashon Dry undivided. a s t " , The Geologic Map of the Shelton 1:100,000 Quadrangle, Washington, by Logan (2003) describes the site as late Wisconsinan(Pleistocene). The glacial till(Qgt)is described as: Unsorted, unstratifted, highly compacted mixture of clay, silt, sand, gravel, and boulders deposited by glacial ice of the Puget lobe; gray; may contain interbedded stratified sand, silt, and gravel; sand-size fraction is very angular and contains abundant polycrystalline quartz, which distinguishes this unit from alpine till; cobbles and boulders are commonly striated and (or)faceted; although unweathered almost everywhere, may contain cobbles or small boulders of deeply weathered granitic rock. The Geologic Map of Southeastern Mason County, Glacial Till Washington, USGS Water-Supply Bulletin 29 by Noble and Molenaar (1970) describes the southern site as Till. The Till(Qvt)is described as follows: r Till. cobbles and course gravel in matrix of mine sand, silt, and clay. Generally a compact, unsorted mixture. Extensively underlies drift plains in thicknesses of a few `A feet to more than 50 feet. Poorly pervious, but has sand and gravel streaks that may yield small quantities of perched groundwater. Serves as confining aquiclude "`' to artesian groundwater at some localities near sea level. #07-0605 10011 Blomberg Street SW,Olympia,WA 98512 7 Phone#: (360)754-4612 Fax#: (360)754-4848 ^tF^,3s�p .c fa;� ^`" ',"i�!.. •C �"'�A.' f aaifi 2' • 'y r t� a t!„t.rwl`ga.;M! •T `•� ���7-.1� {` SA '' e�,+ew 4'3' ._'.,t*',,.:R ^,-� �`Td� r.. n� . t•. �. 'q•. " s *• k -�, s ! Yi�f is iir "a; _ u s'• lot f• s .St w. ��� • � �" �� �� �`•- . '' yJ�C �' ft�f�" ."�1':s-q��f�4 r �6�r)� :I-+i� Ri r..� :!.,.. .��.�(i�tbi.�^p�a���3�' r i4• ����� � i� ���T�F+� �`,µ- Ponding or AV ir .._.¢``�� � 4z•�` r Yt} i�3�.{•:y►'+1 Jt3$•p3i1*s'+�'•` �SRt- �a�r ys•�� ��,���i �'��`�'.ram•a: �. ��•'M��r-�!': !` r••',;w� �:• ♦ "�%1^'.y19•��`�;`:,�i�Y„dt"a.4JF�' {i�-'�". •`fie.. T+*'t�'" TT� �:?%�(.. t ,. -fir,.. f 7T7fl�� 1�/ �3 d.A(, r •� +. • '# '_ ���►y.'f!Itr- .%'��•�•"1•,. r •'. • 1 1. • •1 1 1 • 1• 1 1 1 • • • • • • 1• 1 1 1 1 • •J • 1 1" • 1 •1 • 1• • • •1 1•" • 1 • 1 • • •1 • 1 - • 1 1 /•1 - • 1 • 1 1 r 9�F6 1 t? `' de .- ]" "�.frf3 /4'��rl�eaY• ��' �I1^ �e,,� i �� ,. r �' �' �t y i },%Y, �~� t •' T �• a ' r f..j 1.h�j�i r X L`+�l. jgl 1 �. �:s['• .. ' ! •( S.iw ;C*. ; -gyp'a'' "f.r+� `�'i'» •2 °` -.., ''1� • *.� �`% x.: I ..q� p *? �♦ r r 1,• ✓ ..�� �t. �:r7��af t Y 4•L� by �.y ' ' n / 1 j`�ITilt 1 eq �.t � ! 5.SCi_yid 1 1•`�' ?f "`• .'}f ,.3�, ��'` /►.�:G; pp' ��"+ -� s way''��•�'"'' `,�-.,�"a �^r Y��'.s, z -• Y '.i°�+� s•.•.'` ''f,`.: 7 • 1 -• r r • • r' • q • r • • r• •1 r • • • 11 r • • r- • • r• • r• - - - �K-. wtC I-T�� '. r �•YKil� � '!kr -' Yrt '!�.� �X'.��.; ,,a��. -•. '1,w' x•,'! • w +.' +•l. X, .}ty,y e'�¢,P, iyie..a �'. Y' •• t -n-^•_ f�r r :\_1S � ' -`�f i-. 'fr.�77 � � •tr�gic. J. • , `,� a .I ...` � ? ��• {.:• •. •may. 1' 74 f, I�y,rl, fps - •. ry �' •;.�` {:� .`• . �. V .S"�• v 5 b i44 •• -�' f � •`, i-. -�J�° � �Y- .�' a't r L "'�+) Offsite Glacial Till OutcropkDr Location � 'i1' �x"7��t�" f �1�- '' .`�+ '•. -a el 04 Proposed Residence a ' GEOTECHNICAL TESTING LABORATORY HISTORY OF LANDSLIDE ACTIVITY Slumping and sliding was not observed near the subject site. At the proposed building location, the slope is well vegetated with no indication of previous landsliding. The onsite trees are straight and vertical throughout and surrounding the site. The Coastal Zone Atlas, Volume 9, Mason County (MA-7) maps the site as Vashon glacial till (Qvt). Coastal Zone Atlas Foundation stability is described as "excellent." Seismic stability is described as"good." The slope �. Ayres Point s stability is described as "stable." See figure to r J right. 4 ?' POTENTIAL FOR LANDSLIDE ACTIVITY . scak 1324,OOD Even though slopes approach 34 percent at the ME proposed building location, the potential for === _= ®� - landslide activity is very slight. The onsite and offsite slopes are not a concern for potential landslide activity. The surrounding area includes moderate slopes that are well vegetated and developed with residences. See following photos. s The Liquefaction Susceptibility Map of Mason J ^ County, Washington by Palmer, Magsino, Poelstra, Bilderback, Folger, and Niggemann (September ti 2004)maps the site area as having a very 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. Site class C is a very stiff soil or soft rock. Existing Septic Drainfield V. �s 1�k. '�5Rf � '7 •'� K c r. + 10011 Blomberg Street SW,Olympia,WA 98512 10 Phone#: (360)754-4612 Fax#:(360)754-4848 GEOTECHNICAL TESTING LABORATORY r' Proposed Residence '': ' �> Location ht ` l �y 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. No landslide hazard areas were observed within 300 feet of the site. Proposed activities and site conditions for the development do not warrant a more comprehensive Geotechnical Report (17.01.100.E.4(7)). We recommend no further action is needed unless areas of concern are unearthed during construction or damage ensues from removing vegetation. 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 procedure may 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. REPORT LIMITATIONS AND GUIDELINES FOR USE We have prepared this report for the exclusive use of Andy Mendenhall and his authorized agents for the proposed single-family residence and garage in Mason County, Washington. Site inspections, research, and mapping have culminated in this report. This report is intended to meet the requirements of the Mason County Critical Areas Ordinance. This report does not specify setbacks for: line-of-sight setbacks, FWHCA setbacks, eagle tree setbacks, wetland setbacks, or property line setbacks. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in the field of geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions, expressed or implied,should be understood. 407-0605 10011 Blomberg Street SW,Olympia, WA 98512 11 Phone#: (360)754-4612 Fax#: (360)7544848 GEOTECHNICAL TESTING LABORATORY CONTRACTORS ARE RESPONSIBLE FOR SITE SAFETY ON THEIR OWN CONSTRUCTION PROJECTS i Our geotechnical recommendations are not intended to direct the contractor's procedures, methods, schedule or management of the work site. The contractor is solely responsible for job site safety and for managing construction operations to minimize risks to onsite personnel and to adjacent properties. READ THESE PROVISIONS CLOSELY Some clients, design professionals, and contractors may not recognize that the geoscience practices (geotechnical engineering or geology) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. Geotechnical Testing Laboratory includes these explanatory"limitations"provisions in our reports to help reduce such risks. Please confer with Geotechnical Testing Laboratory if you are unclear how these"Report Limitations and Guidelines for Use"apply to your project or site. �I GEOTECWGCAL,GEOLOGIC,AND ENVIRONMENTAL REPORTS SHOULD NOT BE INTERCHANGED The equipment, techniques and personnel used to perform an environmental study differ significantly from those used to perform a geotechnical or geologic study and vice versa. For that reason, geotechnical engineering or geologic reporting does not usually relate any environmental findings, conclusions or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Similarly, Y environmental reports are not used to address geotechnical po g e or geologic concerns regarding a specific project. i i� i � II it i 407-0605 10011 Blomberg Street SW,Olympia,WA 98512 12 Phone#: (360)754-4612 Fax#:(360)754-4848 it GEOTECHNICAL TESTING LABORATORY LABORATORY SAMPLE U.S.Standard Sieve Opening in Inches U.S.Standard Sieve Numbers Hydrometer Results 100% 20 6 4 3 1% % 'A ? *4 10 16 20 30 40 50 100 200 0% 90% ` 10% 80% 20% 70% 30% r 60% ` ` 40% pt 50% ` 50% W 40% 60% Q) a 0 30% ` 70% 20% �` 80% o 10% 90% 0% 100% 1000 100 10 1 0.1 0.01 0.001 Grain Size in Millimeters Gravels Sands Cobbles Silts Clays Coarse I Fine Coarse Medium Fine Date: 10 08/07 D10= 0.34 Classification %Gravel Sample#: 1542 D30= 2.70 GW,Well-graded Gravel with Sand 60.20% Sample ID: Gravel w/Sand D60= 10.27 Specifications %Sand Source: SL-1 Cc= 2.09 WSDOT 9-03.10 Gravel Base 36.91% Project: Mendenhall Cu= 30.34 %Moisture:6.5% %Silt&Clay Client: Mendenhall Liquid Limit--- 0.00 Dust Ratio= 2.89% Boring#: SL-1 Plastic Limit-- 0.00 Fineness Modulus Sample Meets Specs Depth: 12" Plasticity Index-- 0.00 5.43 Yes oarse Actual Interpolatedrues Actual Interpolated Section Cumulative Cumulative Section Cumulative Cumulative Sieve Size Percent Percent FSpecs Specs Sieve Size Percent Percent Specs Specs US Metric Passing Passing I Max Min US Metric Passing Passing Max Min 6.00" 150.00 100.0% #4 4.750 39.8% 39.8% 100.0% 22.0% 4.00" 100.00 100.0% #8 2.360 28.4% 28.4% 3.00" 75.00 100.00/0 #10 2.000 25.9% 2.50" 63.00 100.00/0 0 1.180 20.1% 20.1% 2.00" 50.00 100.0% 100.0% 75.0% #20 0.850 17.0% 1.75" 45.00 100.00/0 #30 0.600 14.5% 14.5% 1.50" 37.50 100.00/0 #40 0.425 11.5% 1.25" 31.50 100.0% #50 0.300 9.3% 9.3% 1.00" 25.00 100.0% 100.0% #60 0.250 8.1% 7/8" 22.40 92.4% #80 0.180 6.3% 3/4" 19.00 82.4% 82.4% #100 0.150 5.5% 5.5% 5/8" 16.00 76.3% #140 0.106 4.0% 1/2" 12.50 69.2% 69.2% #170 0.090 3.4% 3/8" 9.50 56.8% 56.8% #200 0.075 2.9% 2.9% 10.0% 0.0% 1/4" 6.30 45.4% #270 0.053 Copyright Spears Engineering&Technical Services PS,1996-2004 907-0605 10011 Blomberg Street SW,Olympia,WA 98512 13 Phone#: (360)754-4612 Fax#:(360)754-4848 GEOTECHNICAL TESTING LABORATORY FIGURE 1,VICINITY MAP C 1 BEND � Ty Pnr 2• F I N� 6F I Np i N O j / I r,d.l3 BM rd tp� v„en7, 8M9. i1.01_ re.ia - C ' ? S A 0K0MI'tH J Yl u F L A {ch / d I� -� �lil 4T am � l o }� 5th Street UQy Port Townsend Street ii �' �1-.1 If gal• t,] �j � ,a Site r a r 3jk /'? {, ten. Pine Street zip '~ � McReavy ��>, /�qt ��` x_ Road `' --- K © Dalb}Road 1 rd 20 2 D.•orm.lJ TOPeDu�E•u�-D.ts copYrl9ht o1 cont.nt owns. -- - - 407-0605 10011 Blomberg Street SW,Olympia, WA 98512 14 Phone#: (360)754-4612 Fax#:(360)7544848 DATUM DUES AND SO PLW MCLUDING THE VARIOUS Geotechnical T-N-CITE 'IQUE9ANDSOURCFSMCA-R1NG S-r PoU—BRUNT �ro T.nrr.n, TAPING AND PACING,SLOPE MEASUREMENTS WITH AN /-- G O TRANSIT.S TE LOCATIONS OCS AND BEARINGS USING A BAND HELD a ox.awx�ex, GOO NIT,TO,SITELOCATIONSUSINGAGAAMEO,HAND HEIR Testing GPS UNIT,TOPOGRAPHIC MAPS FROM S RECORDED MASON COUNTY OUN PASS ES AND SURVEYS RECORDED N THE MASON COUNTY ASSESSOR.GEOLOGIC SITE RECONNAISSANCE Laboratory OCCURRED ON OCTOEER 3,207 BY LEVDIE. NORTH 4G R+••a THE PRESENT RECORDED SURVEY DATED NNE 23.1190.THE u•ry SURVEY IS FILED UNDER AFN 90033. o +9 w w a rvvomronA mxo,oa. ."�^rws:.irenn o� --------------------280---------------------- ------------------------------- --------- --------- EXISTING -------- --------------- STRUCTURE W W wr.aco,n.va .. ------------------290---------------------- ----------------------- ----------- Geotechniwl Services — R.....x.v� QA/QC Services _______________________________________ - rnlal r.Yec.wLLYMx�Wo,•cMMow,oLLMF Testing Services YRa[,A,RD VaOaTATm r.V„snpMYn ro Mro we,ur Av sa.av 100, zo w, W rwroMaaiernaard nrt,ait� ID011 Blomberg St.SW veonAreo vconAreo '^ ,oumr,ua,nMworoanxrow.ora na.>K u»rA Olympia,WA 98512 EXISTING SEPTIC v' a .'.`,:;..""cwe",�,"e iK,n w�'.,.,v Phow(360)754-4612 Z a.. .n..<.w� wR., ....,., 300-- Fax:(380)7544848 __________ _______________ _________ ------_ vaoarAto--in aini-----_—_________________________________ ..Mnuwio.nomx nn.....c wua.r..uoa.vwn NOTE: viceRunu ----------- ----�----- oate: lonznoo7 FILL MATERIAL RANGES FROM O D awn Dy:by:L MINE 0-3 FEET IN THICKNESS. wwa A n PROPOSED S .� Checked by:LEVINE ................ .o.,.wM.,,,,.,,,a.�,,.a,..a.xm.a.r.xw. EcoLOG D/NG wwTM asm[ BOIL ga:10-22-07-105 ... .................... rcon"reo Dw ,n,u ruacroaawuw,•w.nw -----Br-oc EXISTING ___________________________________ ARP 100, STRUCTURE - -------- - TT ......ve anrc eoR e�aPe ran ------------------ ' ` AAHrn oPA�.R�vecerAreo r,runoxuorrw.xce o..u.xowox�x,xnrxw... ' � `��{� PROJECT NAME: E ET MENDENHALL SITE T fir 1 _____ 15 PINE STREET rood' . w aY�.`..�ho.0 UNION,WASHINGTON - - -- --- PARCEL322325212015 )rM RL4PR rll,ea,nxxe,ax x,baanoaciwwex 330 `ipW InW,,,,•id" as as Tww ' eMul o� __________________ _____________________________________ ca1111xY WMwY a,LLLxaWe.wrt,grK WrtL ro. 1�0. lwrc K,na a,Mw W nw1 M[1M,r,»"�anuw rAIX NOTE: a o.Pd...�.a�....... ... r g --------------- FILL MATERIAL RANGES FROM ---------- 3-5 FEET IN THICKNESS ALONG DRIVEWAY NEAR PINE STREET. TM;�;d --- —340 w.,.,wr,.x »»'oxwx aaa.nera SCALE I kh-40led EXISTING w.rnnm ran wxwr aran.. nx STRUCTURE axr rorum FIGURE 2 EXISTING STRUCTURE SITE PLAN i 1/2 INCH MINIMUM DIAMETER STEEL ROD (STRAP)CLAMPED SECURELY TO PIPE /MAN CORRUGATED TIGHTLINE 4 INCH �M(/M MINIMUM,6 INCH SUGGESTED i1.:"". '�' 'Y '+.;t' '.` .t�M:`i':i:.:. `' . .:.-i,•'t�•:`;ate.... ,^"i�r.i.\..�.ir::f:+•••4 t r.i:l:�i%�%'P -1 Si1.�$" .�.�'• TIGHTLINE ANCHORED WITH TWO, 3 FOOT REBAR LENGTHS OR BOLTS. FLARE END SECTION ax^4 QUARRY SPALL OR ENERGY ` DISPERSION DEVICE f�''::�`: i,ti a,>:��'� ::::•.. ;e.:- iM_:;�,�: GRASS-LINED SWALE SHOULD BE A MINIMUM ONE FOOT WIDE AT THE BOTTOM AND ONE FOOT DEEP WITH A MAXIMUM SLOPE OF 5 PERCENT. MINIMUM 4 FEET LEVEL SECTION GEOTEXTILE FABRIC Geotechnical Testing Laboratory Geotechnical Services 1o01+B10-b-g sL sw FIGURE S QA/QC Services 01Y' i.WA 98512 ax: zs4� 1360)754-4-481z DRAINAGE DETAILS Testing Services F (xo) eee Not to scale Orin\ V\ L0 6ro - " Mason County Review Checklist For a Geological Assessment Instructions: This checklist is intended to assist Staff in the review of a Geological Assessment. The Assessment is reviewed for completeness with respect to the Resource Ordinance. If an item is found to be not applicable, the report should explain the basis for the conclusion. The Assessment is also reviewed for clarity and consistency. If the drawings, discussion, or recommendations are not understandable, they should be clarified. If they do not appear internally consistent or consistent with the application or observations on site, this needs to be corrected or explained. If resolution is not achieved with the author, staff should refer the case to the Planning Manager or Director. Applicant's Name: Permit# 6&b &),3 - lo) Parcel # Date(s)of the Document(s) reviewed: 6z (1) A discussion of geologic conditions in the general vicinity of the proposed development, with geologic unit designation based on refer ced maps. OK? ✓ Comment: (2) (a)A dis�Lssion of the ground water conditions at the site, OK? l/ Comment: (b) A discussion of the estimated depth to water OK? Comment: (c) A disc ssion of the quantity of surface seepage OK? Comment: (d) A discussion of the upslope geomorphology OK? Comment: (e) Adis,pufsion of location of upland waterbodies and wetlands. OK? V Comment: (3) The appro imate depth to hard or dense competent soil, e.g. glacial till or outwash sand. OK? 7 Comment: (4) A discussion of any geomorphic expression of past slope instability(presence of hummocky ground or ground cracks, terraced topography indicative of landslide block movem bowed or arched trees indicating downslope movement, etc.). OK? en Comment: (5) A discussion of the history of landslide activity in the vicinity, as available in the reference maps and records. OK? Comment: (6) An opinion on whether the proposed development is within the landslide hazard area or its associated buffer or setback and the potential for landslide activity at the site in light of the prop9s6d development. OK? V Comment: (7) A recommendation by the preparer whether a Geotechnical Report should be required to further ev ate site conditions and the proposed development of the subject property. OK?Comment: (8) If the presence of a hazard is determined within 300 feet of the proposed development, then the following are delineated on a geologic map/site map: (a) the area of the propose development, OK? Comment: Page 1 of 2 Form Effective June 2008 (b) the boundaries of the landslide hazard area (top, both sides, and toe), OK? Comment: (c) the associated buffers (top, both sides, and toe) OK? Comment: (d) building or other setbacks (top, both sides, and toe). OK? Comment: (9) A site map drawn to scale showing the property boundaries, scale, north arrow, and the location and nature of exis ' g and proposed developme`n�_on the site. OK? Comment: Are the Document(s)signed and stamped? . Type and #of License: / �c°o�a , e `Sf/�-1' 3 9' If not approved, what is the next action/recommendation for further action? Reviewed by //�UE'CM /! , on Time spent in review: SECOND REVIEW/UPDATE: td�'1� yif'�510 ��'►o/'�J� ti'n /'�of , Reviewed by P , on A 7 Time spent in second review: �Si►r, THIRD REVIEW/UPDATE: Reviewed by on Time spent in third review: Disclaimer: Mason County does not certify the quality of the work done in this Geological Assessment Page 2 of 2 Form Effective June 2008 ��►r� �'°��� -erg' Form Effective June 2008 Mason County Department of Community Development Submittal Checklist For a Geoloigical Assessment Instructions: This check list must be submitted with a Geological Assessment and completed, signed, and stamped by the licensed professional(s)who prepared the Geological Assessment for review by Mason County pursuant to the Mason County Resource Ordinance. If an item found to be not applicable, the report should explain the basis for the conclusion. Applicant/Owner: ANDYMENDENHALL Parcel #: 322325212015 Site Address: 15 PINE STREET, UNION, WA (1) A discussion of geologic conditions in the general vicinity of the proposed development, with geologic unit designation based on referenced maps. Located on page(s) 6-7 (2) (a) A discussion of the ground water conditions at the site, Located on page(s) 8 (b) A discussion of the estimated depth to water Located on page(s) 8 (c) A discussion of the quantity of surface seepage Located on page(s) 8 (d) A discussion of the upslope geomorphology Located on page(s) 5 e A discussion of location of upland water bodies and wetlands. ( ) P Located on page(s) 8 i I I Form Effective June 2008 (3) The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand. Located on page(s) 9 (4) A discussion of any geomorphic expression of past slope instability (presence of hummocky ground or ground cracks, terraced topography indicative of landslide block movement, bowed or arched trees indicating down slope movement, etc.) Located on page(s) 9 (5) A discussion of the history of landslide activity in the vicinity, as available in referenced maps and records. Located on page(s) 10 (6) An opinion on whether the proposed development is within the landslide hazard area or its associated buffer or setback and the potential for landslide activity at the site in light of the proposed development. Located on page(s) NA (7) A recommendation by the preparer whether a Geotechnical Report should be required to further evaluate site conditions and the proposed development of the subject property. Located on page(s) NA (8) If the presence of a hazard is determined within 300 feet of the proposed development, then the following are delineated on a geologic map/site map: (a) the area of the proposed development, Located on Map(s) NA (b) the boundaries of the landslide hazard area (top, both sides, and toe), Located on Map(s) NA (c) the associated buffers (top, both sides, and toe), Located on Map(s) NA �I I Form Effective June 2008 (d) building or other setbacks (top, both side, and toe), Located on Map(s) NA (9) A site map drawn to scale showing the property boundaries, scale, north arrow, and the location and nature of existing and proposed development on this site. Located on Maps(s) FIGURE 2 _ I, CURTIS CUSHMAN hereby certify under penalty of perjury that I am a civil engineer licensed in the State of Washington with specialized knowledge of geotechnical/geological engineering or a geologist or engineering geologist licensed in the State of Washington with special knowledge of the local conditions. I also certify that the Geological Assessment, dated OCTOBER 26, 2007 and entitled 15 PINE STREET, UNION, WA meets all the requirements of the Mason County Resource Ordinance, Landslide Hazard Section, is complete and true, that the assessment demonstrates conclusively that the risks posed by the landslide hazard can be mitigated through the included geotechnical design recommendations, and that all hazards are mitigated in such a manner as to prevent harm to property and public health and safety. (Signature and Stamp) Washj' '"o IgMNMIq d�010M � 2432 c+a'a d 0 CURTIS DEAN CUSHMAN Disclaimer: Mason County does not certify the quality of the work done in this Geological Assessment. ' s . GEOTECHNICAL TESTING LABORATORY ANDY MENDENHALL 102 WEST 3RD STREET NEWBERG,OREGON 97132 R OCT cr2 � 20 RE: ADDENDUM LETTER o� SITE INFORMATION: 15 PINE STREET UNION,WASHINGTON 98592 GPS LOCATION: N47o 21.0451 W123o 05.779' PARCEL NUMBER: 322325212015 DATE: OCTOBER 23,2008 Mr.Mendenhall: This is an addendum to the geologic assessment report dated October 26, 2007. We have provided three copies for your review and distribution. ESTIMATED DEPTH TO WATER To estimate the depth of static water table the surrounding well logs were reviewed. The estimated depth of static water table ranges from 150 to 200 feet. The well logs are attached with this letter. UPSLOPE GEOMORPHOLOGY The geomorphology of the Union area is marked by glacial outwash and till deposits,forming thick layers of non- lithified sediments, commonly well consolidated, marked by upland low rolling hills. These commonly have relatively steep slopes made locally irregular by numerous small, often unnamed, streams. The Mendenhall property is immediately backed by such a slope leading to a point 400 feet above sea level. There are numerous glacial kettles in the area,now forming small lakes,but none are in the immediate area of the client's residence. 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. of Washy Respectfully Submitted, j,O' GEOTECHNICAL TESTING LABORATORY i O-L�hU ✓ n¢neering Geologist / 2439 �y s e.j G eo�o ^- TIS DE`.'! CU�HMAN Curtis D Cushman,L.G.,L.E.G. �� Senior Engineering Geologist 907-0605 10011 Blomberg Street SW,Olympia,WA 98512 1 Phone#: (360)754-4612 Fax#: (360)754-4848 GEOTECHNICAL TESTING LABORATORY WELL LOGS Yil,4..deal.fed rent C.My wnq ' .he D,•.t,on of water R..w..ee �ti'ATFR 1VELL REPORT Ayvl:aaOM N o._... s...etd CoOY--owerr's Copy aura Cagy Dtiner's COMY •TATE OF WASMNOTON Pem.tt No. t: ?I) OWNER: Name te0.11o_.Jb�-.LJ&f-- "*U.CGAtftty...._. AdCttw.$.41! lit... O 2) LOCATION OF WELL: c~.......►�t> tCN_----- ------ !Z _. ..Yi get. XL.T_..2.;N..R.3W W M. W r"rhee am Aistwoce ftortl sekoon or stebav{[Ion termer Lot 9 3Lk 7. Grayl11•>FRo! � Oaitm Cl,tr_w•i_i�_Additioo cr__ 13) PROPOSED USE: Moamar a laawtria(3 sarecepal 17 (10) WELL LOG: p/ 41 .7yea.p T.,..en Q Otetr O ►orsatlaw.e"of ae by ee a•. flea kind,nn of meteet t eewd enol�•r,..d j Now-peseta to am&a so.d Pb tdmt n Baton of IM not of 1»eor� ateoraw p�etnlad,Mtb tl YaM apes twt•y for eonft tAwpt aJ Jarmot,e.. a 14) TYPE OF WORK: oroersnuralbera:.eo No. ' .� of awed flu.gaol.... __..._.4L_...� MA7URtAL FROM To L Now well n Method:Deli D •oral O Deepened D 'Cabta j) Proven 12D 9011• a•r A tllarel TO- 8 . e feeooreauloned C aMA"0 J«NA Q _FiRlA P•a •_ I lA O — Cupoted Cl f•La grew*1 - 8J_ 60 e (3) DIMENSION'S: Dlamerter of pewit_..?iQ__-_ 1wMa. Drilled- TlIS...-_-a -npu,ae.aattNa d.en__3��.... tl "Grl"I"L I ttl0-wttr 60 62 _. Claw L Ll�t!•L_ 62 99 E (6) CONSTRUCTION D$TA11S: " ii!•rel frltle Mate! 99 SOS, _. `O Casing installed:- . 6._-d.eM1 n.. ._.0_tL r..Yk ..A S1y Orel -- lOS _ c r..r.aeed C d a'Dlatei pan -.Q'-« r. .rL .� 139 1W wndeo A ...-Wamm►fiaaa--R b..._.�..L1. ..� 1•` 68 2" c► S'e44r a aravel with Mate! _ 2S9 S_ 1'rr[orntiont: v«■ lee "' Ct r 1 _ 265 �278 ,�I.. preerat«oeae-Qlilla Itbife.,_�____ c1.1r 8 t(ravel L Mat r 278 7 O �:ZE of erft 11 tr -3/8.........in-by --._.-2.._ ._[IL - - --- c 13 _ l'opertoratt.ea trom n. �� 1297 298 oerratwe.t from .+R b ...A. ._ ... .__... pettorstiom from .._..__._.-.fL i Screens: Ye.p NO a. ManVt.Hur.rY Naeta�._�_..-...».._..........�»--- Trvr.....__... ..._._.......- --._ slab" t Diane._......WI at=...._....treae.......-fL ea-__A. ` Diem._...-"MO aha:-----front el.is....._-.OL - e Gravel packed: yea O 1%a an or Iaaa•It - a- Gravel staved itorlt - r3 Surface sea[: yesar[ N. To.k.t a.Putt_11._. fL MeeterW osd M O Din any strata tewtallt ttntwbla tratert .yea Q ilia O . -- Z Types of --- Depth of streta_-___ >telnod of Milan - _ I p17) PUMP. Ieantl��tt Type. 71 O (3) WATER LEVELS: O Itatte Level. 2A3 . ..___..•lt,e.eow tap or Mao L) %n Mee Prts"r. ... ..-_. .. 16e.Per square Ins# -- LLI Ara.tsa want M easer000d by.- O (9) WELL TESTS: 1Drraae�edo-1. 1!Wat A"d Is OCt. 27 �� Maea Maned -.. . No.. .2 c ... _.)s fl •.r.s a Pwn*teat made, Yn n No❑ If r�by whorret. Dri tttsu.. ._ .. pNltatn with �,2` It.deawdowee-aNer�3.- hn. WM.L DRILLERS STATEMENT: ` .- ---- - - This,well was drilled under my juilvlletlon and this rfpurt Is - _ true to the best u[ mr knowledge and Ileliel- a •!vrovery n+ta Itlme�seto a seyo .Mo pump taro"erg) (wade level Q metawred tto..rwR ioo to Wier W eti Dri111 R Stn►fill Toe wowLeur1( Tema Water Lee Tatar wow&&"I NAhtr. e7... -_..... ..........�..�........__.._.._-.. ._ _.. IP`raew.asmea.m aar00talIMD ITf Pa M Prtpl ,.._................. ..._-, t ....___......_.....^....._................�....�.�...� 1 let. i Mae 16S 1tseNrtea 11d• � ....2 �,i1Lea....1Q...[�a....t0_.11��.G... ta_............�..._ Address.........___....P.__._.....-�....._J........ .........__._..r_........�. ......... mte oe test. 11/2 1.....__ [Signrd] Ba,ert eett ... Wlwdw..ee. fL draweeswn ales.-----Jeri• eNeR T)tallert rt,nerratum of wear Mar chemeal aotatYats made yet Q Noah Utente No..074.106..01,1._._..Dahl.- •... ..�..........,1a.71 dl� �r V toss AfsOeTIONAL stesres IT Nlacesswarl ♦. :ha rt.v�•<tt�! as Mrs #07-0605 1001 1 BlombergStreet SW Olympia, A 512 ,0 Yn►P a,W 98 2 i Phone#: (360)754-4612 Fax#: (360) 754-4848 i GEOTECHNICAL TESTING LABORATORY WATER WELL REPORT ICYoRRENT ckee orleteet No.W237312 /?rpnal�1`.aq�-FaM<t.T"ee�-wre*.Y'ws�-htRe. t c r t'A'G'l Unique Ecology Wen ID Tog No.ALr101S Carts/ructiort/I3e.Ini sioa Cx"in rNek) ElConstruction ��'' 8 Water Right Permit No.ExEmrr WELL Decommission OMINAL MTAt LfT!(>r T Property Owner Name DAVID STEEtE cl hnpnr Nalarber Well Street Addrm 231 E LINDA VISTA COURT rrtOrQ�Itm Ocarcric kambid 8 Mauegl ❑aa�r. tom.. ret lta I)tkn City UNION County MASON r%v%oT"101M Or.nn6rar.Jl hfaor am r.r1 L' an 1!6-III 1/1 Sec 2 Twn wer . RT R!W ❑ad. Sm——a mmmieird .wuw.- D s Maw p o..e. Y+•/m a o.toaa.a 8crear 0Reg" p k"W Lwl.nod(s.I.r Lot Deg Las Wrw Sec ane%alowa+fxwmwdrdt 6_�dw 4rRd 200 ! S611 REQUIRED) Lo%Deg Left MpAw D,A dmaoAarA wall,].$�,� R C0fM1tLCT1Ov D6'TAHa Tax Panel No 322333SI)M(1M arras W.0 d i - a— tarnRtii Ltarlawaaar IAra i— » Rae R. CONSTRUCTN?N OR Ilf"FAMENION PROCKDIIRL. n .a r.wlto - o .Ace L L Ye 0W TPrrttr OrstM bN rt�doter.aav d�aet.nr aar rrer4 W M tab rd Trre dasbara rraa $own orft aarewat m sad eraarn P—A.'k ro r toe aaswry IN r&cb-v 9( wommam ZONAL SHEETS tF rh-' SK SARY SSf tLl wf�_w bT n ad ao drr6_her.�L»_R MATER AL FRCP TO .ireaww: E3v. Ne Wttt LNpr _. ORMIN SILT'SAND AND GtA VTI U 16 Mr.fanua 1,NA r --- BRMN SILT ROUND SAND AND(TRAVEL 16 a3 IrK hag"NO GRAYCLAY 92 67 O.m Sigs�ee � n,a w ara_ SiaaQ M rt.a w CKAYS1LTBOUND SAND AND GRAVE L 47 so Gve"Wriww RFZISFI DROWN SILTY SAND AND GRA VLL 6e IN ►erae6 ptoad eon n_a L (XtAYSrL-rYClAVANDGRAVEL M Ila S.wble Se*Oyes QRb Towtr 4traf•20 L BRO%%W SILT BOUND SAND AND GRAVEL Ito Its wsw.u.w i.wo B•,ftl'r0r.[[EfNIhS RF.O SrL IY SAND AND GRAVFI 135 NS tarauy+rmoaoorwbtmaa- Qyet OYe I"SIL7Y SAND.GRAVEL,WV PAS qT Tvyadwrr+_ DWb4f ras BU.IECLAY Is? 196 vaAaAdaeli�rrwM GRAV ULAV 196 213 PI:AtP seaadLvows NW" RPDSll:1•GRAVEL.COMPACT.WET 213 2" It". 11,r GRAVEL AWDWATFA 26R no WA1ERLM4L+ladoadaeee/e.nm Ae«e ner+sa tr•el __e 9afak.tll logo ARlµn Pwrw .�_am P..care rea Dow Ada by_. (top,-We ac WIE"TTSSTS.FAW.Aeww h areas" am►at 1.I—w ho—do.last Was aPrp wa,aaaA Q Yr ON- Irvc-,by i— _ ylA1___„_,jacrw•vui 11.6twdD�.e a�n irs YIMA ya.aar aiai _.�,_R.pa..dwa vin _*ri Ykfg _Ad a-wk_ R.6o4wo aln__lei Jleewy d—fv r=A- :an,altw.7a.WAewr,Igv h.ay.f:MwroswJ�rw,watt wr M""L-alr C♦� nm War ai.d In— Wrap Ltd TW" woes Lf-* �•• s Dareerael —— iLalar[r1 _Y1laar rri+ rt.w.vw.aM aR 1 . AYYr __ we rww.0 r 270 •fee 1 au , .. - ..- Aweir.A— Apm Dar TasP=s=QrWr WLaac68v"daa-5 -NOW. QVe ON* Sun Dow Ati07 (bwrreree0aes dihVT WELL CONSTRUCTION CERTIi1GATIOr: 1 oua.xntclod a0d16r A4cspr responiAmlit)tax aulmudios ofthi%wcil,and its mmphaacc with all Ww;hinelnn vw:11 v.onslrurtim i andas& Malerials eavccd and ft inronnati0o regaled•hove are WUe 10 Rly best►nowkdge and belied. Wnntn oeft—OT—Nira(►viw ED NELSOCi nrHliR C<wpr7 ARCADIA pRll,_LINQ It'!C Ui1c.•Tiper�rrawet Siprtm AAA..tr�OBOX 1790 dlrare latwr Laaar tN llfr6 EDb:�NOP Lb SF XTJN WA 99564 tf TRAiYEj. Camamrti oalrra tAaee A.. Reomewor w ARCADDIMIC 1 ow 4AM �'�A�otre m►aee w r rqd ctTrwrwrr riaNaw WY 0364-20(Re,1As) flri 0"Wb not of ECOM does NOT WWrWitr IAs Daft 0 C610 MNonRatlon on this Well Report. #07-0605 10011 Blomberg Street SW, Olympia, WA 98512 3 Phone#: (360)7544612 Fax#: (360)754-4848 L-