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Home My WebLink AboutGEO2016-00065 for FPA2016-00004 and BLD2016-00889 - GEO General - 9/29/2016 N.L. OLSON & ASSOCIATES, INC. Engineering, Planning and Surveying September 29, 2016 Project Number: 9385-16 Attn: Michael MacSems Mason County Community Development 615 W Alder St Shelton, WA 98584 Subject: Seepage Clarification Proposed Single Family Residence 150 East Island Road North Grapeview, WA 98546 Mason County Parcel #: 12108-75-00080 Mr. MacSems; N.L. Olson and Associates (N.L. Olson) has provided our response to Mason County's Review, checklist item #2.c, per the reviewer, further clarification of surface seepage quantity was needed. N.L. Olson's Response: During our site work that occurred, N.L. Olson did not encounter or observe subsurface seepage in the test pit excavations. At the time of our site work, no surface seepage was observed. If we can be of further assistance or if you have any questions regarding this project, please contact our office. Sincerely, Wesl4yy4MZonP.E. Geotec�nical Division Manager P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 • Fax: (360) 876-1487 \\SERVER\UsersVMohnson\project folder\Proect Folder%9385 boles\Letter,doc r�PA aoi� - oDbo �l Ea 20 I(.a . oo Xe 5 2bI to - DO889 SLOPE ASSESSMENT PROPOSED SINGLE FAMILY RESIDENCE 150 GRAPEVIEW, WA 98546 CLIENT: RECEIVED SEP 12 2016 Gerald & Wendy Boles P.O. Box 224 615 W. Alder Street Grapeview, WA 98546 BY: N.L. OLSON AND ASSOCIATES, INC. 2453 BETHEL AVE. SE PORT ORCHARD, WA 98366 (360) 876-2284 JOB NO. 9385-16 v s _ August 2016 N.L. OLSON & ASSOCIATES INC. Engineering, Planning and Surveying August 31, 2016 Project Number: 9385-16 Attn: Gerald & Wendy Boles P.O. Box 224 Grapeview, WA 98546 Subject: Slope Assessment Proposed Single Family Residence 150 East Island Road North Grapeview, WA 98546 Mason County Parcel #: 12108-75-00080 Dear Mr. & Mrs. Boles; This report presents the results of our field investigation for the referenced property. In the following, we present our findings and conclusion for the slope assessment and proposed single-family development. We appreciate the opportunity to be of service to you on this project. If we can be of further assistance or if you have any questions regarding this project, please contact our office. Sincerely, Wesley R. Johnson, P.E. Geotechnical Division Manager P.O. Box 637.2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\wjohnson\project folderTroject Folder\9385 boles\geo assesment.doc APPENDIX A TABLE OF CONTENTS INTRODUCTION ........................................................................................................................1 SITELOCATION .........................................................................................................................1 SITECONDITIONS......................................................................................................................1 PROPOSED DEVELOPMENT ........................................................................................................1 DEPARTMENT OF ECOLOGY WATER WELL REPORT.....................................................................2 SLOPE RECONNAISSANCE AND LANDSLIDE ACTIVITY....................................................................2 HISTORICAL LANDSLIDE RESEARCH............................................................................................2 UPSLOPEGEOMORPHOLOGY .....................................................................................................3 UPLANDWATER BODIES............................................................................................................3 WETLANDS ............................... ................ .......................................................................... CONCLUSIONS AND RECOMMONDATIONS...........................................................................3 REPORT LIMITATIONS .............................................................................................................4 VICINITYMAP............................................................................................................ FIGURE 1 SITEPLAN................................................................................................................. FIGURE 2 TESTPIT LOGS......................................................................................................FIGURE 3-8 APPENDIX A - MASON COUNTY DEPARTMENT OF COMMUNITY DEVELOPMENT SUBMITTAL CHECKLIST SLOPE ASSESSMENT PROPOSED SINGLE FAMILY RESIDENCE 150 EAST ISLAND ROAD NORTH GRAPEVIEW, WA 98546 INTRODUCTION This report presents the results of our site assessment for the referenced project. The assessment was done per Mason County Resource Ordinance, 17.01.100 landslide hazard areas, section E, special reports, page 6 of 15, dated June 16, 2009. NLO has included Mason County Department of Community Development Submittal Checklist for a geological Assessment in the Appendix A of this report. SITE LOCATION The property is located at the address of 150 East Island Road North, Grapeview, WA and by section 8, township 21 north, range 1 west, in Mason County, Washington. The Vicinity Map illustrating the location of the property is shown on Figure 1. SITE CONDITIONS The site is bordered to the west by East Island Road North, to the north by East Island Crest Road, to the south by undeveloped land and to the east by a single family residence. The property is rectangle in shape and about 4.89 acres in size. Access to the property is provided from East Island Road North. We have shown the subject property on the Site Plan, Figure 2. The site was comprised of secondary growth consisting of douglas fir, cedar, alder and large leaf maple and low lying brush underlying the canopy. PROPOSED DEVELOPMENT The client has proposed to construct a single family residence on a 4.89 acre lot located at 150 E Stretch Island Road N in Grapeview. Approximately 2,300 sf of building and 2,400 sf of driveway are proposed on the property, along with associated well and septic drainfield. We have shown the approximate building area on the Site Plan, Figure 2. FIELD INVESTIGATION AND LABORATORY TESTING Subsurface Investigation The site soil conditions were explored on May 19, 2016 by excavating six (6) test pits. The test pit excavations ranged in depth from 12 feet below current site grades. The purpose of test pits were to observe underlying soil conditions for future infiltration of storm runoff. Bill McTuranl Enterprises performed the excavation work with a Kamatsu excavator. The approximate test pits locations are shown on the attached Site Plan, Figure 2. P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\wjohnson\project folderTroject Folder\9385 boles\geo assesment doc Project No. 9385-16 August 31, 2016 Page No.2 Site Soil Conditions The site was generally underlain by a brown, loose to medium dense silty sand roughly three feet to four feet in thickness overlying a dense, gray, silty sand, (glacial till). For additional information concerning the site's soil conditions, please see the attached test pit logs, Figures 3 through 8. Ground Water Subsurface water was not encountered during our subsurface exploration program. Laboratory Testing Phoenix Soil Research, in Kingston, Washington was utilized for the laboratory analysis. The laboratory testing result have been summarized in the Table 1. Laboratory Results, Table 1 Test SAMPLE SAND (%) Silt(%) Clay (%) Pit DEPTH TP-1 2.5 ft 81.3 16.8 1.9 USDA soil gradation indicates a loamy sand DEPARTMENT OF ECOLOGY WATER WELL REPORT Depending on elevation, the water well logs in the general vicinity of the subject property indicated a roughly 25 feet to 30 feet thick layer of till underlain by clay. Below the clay, sand and gravel were encountered with the water table ranging about 50 to 100 feet below ground surface. SLOPE RECONNAISSANCE AND LANDSLIDE ACTIVITY As part of our fieldwork performed on May 19, 2016, the slope area was examined for indications of slope instability. Indications of slope instability include head scarps, hummocky terrain, inconsistent patterns of vegetation, tension cracks, seepage zones and course grain material overlaying silt and clay soils. The proposed building area will be located on a slope that descends from west to east. The gradients in the proposed building area ranged from 15 to 20 percent with a vertical relief from the building area to the wetland was about 50 feet the length of the site. The slope areas that extend off the property to the west reduced in steepness. At the time this report, no slides or erosion concerns were observed on the property and the overall project area appeared stable. HISTORICAL LANDSLIDE RESEARCH A review of "Coastal Zone Atlas of Washington" Department of Ecology, Volume 9, 1979 (Mason County)" was performed in conjunction with preparing this report. The slope stability mapping along the proposed bulkhead alignment has been mapped as stable (S). P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\*ohnson\project folderTroject Folder\9385 boles\geo assesment doo Project No. 9385-16 August 31, 2016 Paqe No. 3 Stable slopes are generally less than 15 percent but can include areas of steeper slopes that are stable due to low groundwater concentration or competent bedrock. The stable slope designation also includes areas underlain by weak areas such as peat, which are stable because they have no significant slope. UPSLOPE GEOMORPHOLOGY According to Eric J. Schuster's, "Geologic Map of Washington State", the site and its surrounding geologic makeup predominantly to the south west was classified as Pleistocene Continental Glacial Drift (Qgd). This includes the sediments as mentioned by the WDGER above. The geomorphology of this area shows signs of glacial scouring in generally a northeast-southwest direction. These trending ridges and valleys were carved by the retreat of glacial ice in the Pleistocene (approximately 10,000 to 12,000 years ago to the end of the Epoch). During the retreat and melting of the glacial ice, the scoured areas and closed depressions were filled with outwash material (alluvium). Alluvium consists of glacial fluvial sediments, such as sand and gravel that are deposited near the terminus of the glacier in a size-sorted manner (fines up sequence). The property and surrounding areas consisted of glacial till. Glacial till is comprised of glacially consolidated sand, gravel, and cobbles with variable amounts of silt and clay that exhibits high strength and low compressive characteristics. Locally, this soil unit is referred to as "hardpan". UPLAND WATER BODIES Non exist WETLANDS NLO has reviewed maps in the area of the proposed development and a previously prepared wetland report has identified the area along the east side of the property. The previously prepared wetland report titled "The Wet Land Corps, Mason County Parcel #: 12108-75-00080, E Stretch Island Drive North, Grapeview, WA", TWC project Number TWC16W38 dated April 2016, has provided buffer/setbacks for the subject property. The wetland area has been identified on the Site Plan, Figure 2. Given the separation distance, existing vegetation coverage and gradual sloping topography, N.L. Olson does not anticipate the development occurring upslope of the wetland area will be impacted. CONCLUSIONS AND RECOMMONDATIONS Following our review of Mason County Resource Ordinance, Ordinance Number 77-93, we conclude that large scale sliding or deep-seated rotational failures resulting from the proposed construction appears negligible. The overall global stability of the property under the present site conditions appears good. In our opinion, the property is not located within or near a landslide hazard area and an additional geotechnical engineering report will not be necessary in regards to the proposed development. P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\*ahnson\project folderTroject Folder\9385 boles\geo assesment doc Project No. 9385-16 August 31, 2016 Page No. 4 REPORT LIMITATIONS This report has been prepared for the client regarding the subject project. Information presented in this report has been collected and interpreted in a manner consistent with the level of care and skill ordinarily exercised by members of the profession currently practicing under similar conditions, and in accordance with sound and generally accepted principles consistent with normal consulting practice. No other warranty, expressed or implied, including (but not limited to) any warranty or merchantability or fitness for a particular use has been made. In the event that change in the nature, design, or location of the proposed construction is made, or any physical changes to the site occur, recommendations are not be considered valid unless the changes are reviewed by NLO and conclusions of this report are modified or verified in writing. Any site involving sloping terrain has inherent risk of earth movement. As a result, the CLIENT agrees to accept full responsibility for all risks associated with steep slopes. The CLIENT acknowledges that this risk cannot be completely eliminated and that engineering and geologic analysis is intended to reduce the inherent risk associated with slopes. No amount of geotechnical engineering and geologic analysis can provide a guarantee of stable slopes. Geotechnical engineering and geologic analyses are based heavily on subjective interpretation, professional judgment, and opinion regarding the physical conditions at a specific site. Subsurface conditions are only documented at those points where samples were taken and interpolation and extrapolation is necessary between and around sample locations. Conditions can vary between samples and can change over time due to natural processes and/or human activity. Analyses and recommendations provided in this report are based in part upon the data obtained from the subsurface explorations. P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\wjohnson\project folder\Project Folder\9385 boles\geo assesment doc SITE M n \ E GRAPEVIEW Il Qp , : T � � � �� ate•` =q ` c STRETCH ISLA F k ` CASE INLET S�f tit5;.' y.. �a• r- .. r g,�.�r sit ,�.F x k t - r Atriw VICINITY MAP N.L.Olson&Associates,Inc. Test Pit Logs Engineering, Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O.BOX637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged By. Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL ste5n9/;6 End5Date/19/16 62' TP-1 1 of 1 Surface Conditions: General Notes Y c K Fir Trees a USCS ;E Geologic Sample Collected SYMBOL m Code 0 TPSL Topsoil ' ' } Brown silty SAND with gravel, moist, medium dense .r. r..r:• 1 1.0 ' 1.:1 - Fine to medium grained sand i .� is -Sub-angluar to semi-rounded gravels up to 2" in particle size J. 1:4.` 2 - Iron oxide staining at T bgs 3— el. 59' r.1.A Gray silty SAND with gravel, moist, very dense, glacially consolidated r..t. 1°•I' + . - Fine to medium grained sand rl '1.'. 4.0 :� ;� .�. - Sub-angluar to semi-rounded gravels up to 3" in particle size A .i SM 5 -Trace cobbles �1 i. I. 6.0 ; A, t 6 - Interbedding layer of gray SILT at 6' bgs + t' 7 ' f. .( ._ 8 F I •I- 9 10 el. 52' End of Test Pit 10.0 ft bgs 11 12 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn ey: Date Test Pit Completion Bill McTumal Enterprises Rick Grab NJL 5123116 ❑ Monitoring Well Equipment Groundwater Elevation El Excavator Checked By: Date Piezometer WRJ 5/23/16 ® Abanonded and backfilled Notes: Revision By. Date ❑ �-�� 3 A'*AN.L.Olson&Associates,Inc. Test Pit Logs Engineering,Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O. BOX637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged By: Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL Sta 5/19/16 Ends/9/16 56' TP-2 1 of 1 Surface Conditions: General Notes s s v Fir Trees a E USCS -5 Geologic Sample Collected SYMBOL o Code TPSL Topsoil Brown silty SAND with gravel, moist, medium dense - Fine to medium grained sand r._i:.:i; 2 -Sub-angluar to semi-rounded gravels up to 2" in particle size el. 54' =i is :` Gray silty SAND with gravel, moist, very dense, glacially consolidated : - Fine to medium grained sand r .r .t 3 - Sub-angluar to semi-rounded gravels up to 3" in particle size .m.l a . -Trace cobbles .► �. 4 SM - Interbedding layer of gray SILT at 6'bgs 1 T I 1 4 .I. 6.0 + �''t. . 6 h 1.'t- A VA.. .l: 7 l .t.;1': t I: I-, t.. f:. 1. el. 48' 8 Gray SILT, moist, hard, glacially consolidated 9.0 9 -Trace coarse grained sand - PP=4.5 tsf ML 10 11 -Sand content increases 12.0 12 el. 44' End of Test Pit 12.0 ft bgs 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn By: Date Test Pit Completion Bill McTumal Enterprises Rick Grab NJL 5/23/16 ❑ Monitoring well Equipment Groundwater Elevation ❑ Komatsu Excavator Checked By: Date Piezometer m WRJ 5/23/16 ® Abanonded and backilled Notes: Revision By: Date ❑ L'-`i N.L.Olson&Associates,Inc. Test Pit Logs Engineering,Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O.BOX637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged By. Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL Sta5//19/16 End5/119/16 44' TP-3 1 Of 1 Surface Conditions: General Notes o Fir Trees n E USCS Geologic Sample Collected C2!r j SYMBOL o Code TPSL Topsoil { ' Brown silty SAND with gravel, moist, medium dense - Fine to medium grained sand 2.0 .: 2 - Sub-angluar to semi-rounded gravels up to 2 in particle size -t: el. 41' 3 Gray silty SAND with gravel, moist, very dense, glacially consolidated 4 - Fine to medium grained sand 4.0 - Sub-an luar to semi-rounded ravels u to 3" in article size I ` r SM g 9 P P ';t I -Trace cobbles 1.1..:1 1 7.J . 5 - Iron oxide staining at 4' bgs .1 '4, .t 6 rrl _ 7 t I:•L, 8.0 r..`+: I. el. 36' 8 End of Test Pit 8.0 ft bgs 9 10 11 12 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn By. Date Test Pit Completion Bill McTurnal Enterprises Rick Grab NJL 5/23/16 ❑ Monitoring Well Equipment Groundwater Elevation ❑ Komatsu Excavator Checked By: Date Piezometer WRJ 5/23/16 ® Abanonded and backfilled Notes: Revision By: Date ❑ • A!A N 1.01son&Associates,Inc. Test Pit Logs Engineering,Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O. BOX 637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged By: Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL Start/19/16 End5/19116 44' TP-4 1 Of 1 Surface Conditions: General Notes s g Fir Trees n E USCS r,, Geologic Sample Collected tE kn SYMBOL m Code 0 TPSL Topsoil ' ' } Brown silty SAND with gravel, moist, medium dense 1 - Fine to medium grained sand 1.5 a:"I - Sub-angluar to semi-rounded gravels up to 2" in particle size .I ; 2 el. 41' I i•rl•; 3—Gray silty SAND with gravel, moist, very dense, glacially consolidated 1%:.�:i . 4 - Fine to medium grained sand . ; - Sub-angluar to semi-rounded gravels up to 3" in particle size t U.:I. ' SM -Trace cobbles 5 - Iron oxide staining at 5.5' bgs 6- 7- 8— it 9 10.0 10 el. 34' End of Test Pit 10.0 ft bgs 11 12 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn By. Date Test Pit Completion Bill McTurnal Enterprises Rick Grab NJL 5/23/16 ❑ Monitoring Well Equipment Groundwater Elevation ❑ Checked By: Data Plezometer Komatsu Excavator WRJ 5/23116 ® Abanonded and backfilled Notes: Revision By. Date ❑ �C U A • A!AN-L.0Ison&Associates,Inc. Test Pit Logs Engineering,Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O.BOX637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged By. Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL Start 9//16 End 5/19/16 32' TP-5 1 of 1 surfere Conditions: General Notes o Fir Trees n E LISCS t Geologic Sample Collected rn SYMBOL m Code TPSL Topsoil 1 ' Brown silty SAND with gravel, moist, medium dense :G 1 - Fine to medium grained sand 1.5 r :� SM 2 -Sub-angluar to semi-rounded gravels up to 2"in particle size J. 1. '.I; 31 r:r:r el. 28.5' 4 Brownish gray poorly grades SAND with silt, moist, medium dense SP-SM - Fine to medium grained sand 5 -Traces sub-angluar to semi-rounded gravels up to 1" in particle size -Slightly cemented el. 26.5' ML 6 Gray SILT, moist, stiff, mottled, PP=2.5 tsf el. 26' Gray silty SAND with gravel, moist, very dense, glacially consolidated 7 - Fine to medium grained sand - Sub-angluar to semi-rounded gravels up to 3" in particle size -Trace cobbles 8.0 I•...1.:{ .. 8 SM g 10 :L....1. J. 1 1.'1:, T -f 1. 1..1. 1 . lit A_ 12 el. 20' End of Test Pit 12.0 ft bgs 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn By. Date Test Pit Completion Bill McTumal Enterprises Rick Grab NJL 5/23/16 ❑ Monitoring Well Equipment Groundwater Elevation Komatsu Excavator Checked By: Date ❑ Piezometer WRJ 5/23/16 ® Abanonded and backfilled Notes: Revision By: Date ❑ k-611 N-L.Olson&Associates,Inc. Test Pit Logs Engineering,Planning and Surveying 150 E Stretch Island Road North 2453 BETHEL AVENUE P.O.BOX 637 Grapeview,WA PORT ORCHARD,WASHINGTON 98366-0637 Job Number. Logged 8y Subsurface Exploration Ground Surface Elevation Test Pit Number Page 9385 NJL Start End5/19/16 30' TP-6 1 of 1 Surface Conditions: General Notes _ Fir Trees a E LISCS EGeologic Sample Collected y SYMBOL O Code TPSL Topsoil Brown silty SAND with gravel, moist, medium dense 1.5 ' 1 - Fine to medium grained sand r..�: % - Sub-angluar to semi-rounded gravels up to 2"in particle size 2 el. 27.5 f- F: 3 Gray silty SAND with gravel, moist, very dense, glacially consolidated Fine to medium grained sand F`: 4 - Sub-angluar to semi-rounded gravels up to 3" in particle size -Trace cobbles r { :4:".t SM 6 IrI 7 .I .1 A .. . 8- 9— :IA. h .I _ 1 0 t..,. ..,.. I. t 11 12.0 ;` � :� 12 el. 18' End of Test Pit 12.0 ft bgs 13 14 15 16 17 18 Contractor Operators Name Sampling Method Drawn By: Date Test Pit Completion Bill McTurnal Enterprises Rick Grab NJL 5/23/16 ❑ Monitoring Well Equipment Groundwater Elevation ❑ Komatsu Excavator Checked By: Date Piezometer WRJ 5/23/16 ® Abanonded and backBlled Notes: Revision By: Date 0 GERALD & WENDY BOLES ESP z }` STRETCH, \\90014I I I I 1 1 12108-76-90010 I 112108-75I I 12108-75 o -00033 I -00032 II -00031 II -00030 -00043 I -00042 I -00041 I -00040 12108-11-00010 -90013 N FOUND REBAR AND CAP FOUND IRON PIPE 0.2' N. '� _T^"'r J \ 0.1' E. OF PROPERTY LINE I I I I HELD AS SE FOUND IRON PIPE r�, -£.,c / U:CTL lI AND 0.2' E. OF \ ICALCULATED POSITION FOUND IRON PIPE 0.2' E CORNER OT 4 FOUND BENT IRON PIPE ' ? a IPOINT OF BEGINNING S 89'15'27" W OF CALCULATED POSITION I I 0.3' E. OF CALCULATED � 'T (LOT 6) E. ISLAND CREST RD. _ s sT3r3z' w sss.aT(D) _ _ _ _ POSITION CASE INLET s.. _ ......._.... _........ ..._. - - _ - - N Bazs'ss" w 227.72'(G) N - e , Scale:1,�, Tom■7f 1■,1■I`■P ri'i ■'■,■■�i �Tr :■ ■'■ ■ '■ ■ 1L! Sri• ■ ■ �� ■ 'Ira _ O 0 b h T1% O 6 Q', 0 h �b •u 1■�■� ■ ■ - 40 0 ao ao ( .. ... 82 n v 6 ti 7h tiff ^� ry0 �� / ry" ryry \ 09 2 rA VICINITY MAP N 89 46 27 ,6 6 6 *� 0 h 5 � t� h h �• All that portionof Government Lot 9 Section 8,Township 21 % * ® / ;' ;' '•• ,�ap_y,,• -�� 4 �Tpr.6 North,Range I West,W.M.in Mason County,Washington p r 30 j . Ss•e/.w /' I F _ I ^ r '- -- � .' ; -�I�� ', •' r / ,, � / . ';_ ■ LF 1-4:;f`+F,TY �^iE to NOTES 1. HORIZONTAL DATUM: WASHINGTON o N,' -- i.' / / ,% / / / /" / 8 // / I EGENt1 STATE COORDINATE SYSTEM NAD ® FOUND 5/8" REBAR AND CAP LS 28237 63/2011, NORTH ZONE PER CPS I _ R,. -- '• , i• / / / 12108-7 00060\ - $ TIES TO WSRN. a ' ' //� , �/ / / r i / / / / BGO• ./` .`L O FOUND 3/4" IRON PIPE AND CAP "LOVRT" / / / / m^ 0 FOUND 3/4" IRON PIPE, NO CAP 2. VERTICAL DATUM: NAVD88 PER TIES I I. / / / r/ / ,' / / / / / / e�\}' TRANSFORMER TO WSRN. o- - , 3. REFERENCE: SURVEY RECORD IN 2 POWER VAULT VOLUME 1, PAGE 115, RECORDS OF O / /! / / /' /• •' Z_o TELEPHONE RISER MASON COUNTY, WASHINGTON. / CABLE TELEVISION RISER 4. REFERENCE: SPECIAL WARRANTY DEED Z I o N RECORDED UNDER AUDITOR'S FILE a _ �• SIGN NUMBER 2025292. RECORDS OF I '�• �` '�• / Z _T 1 MASON COUNTY, WASHINGTON. .�• : ,/- / j •/ - ' BOLLARD p,� j / / j/" ' ■ 6" SOIL TEST BORING, AS NUMBERED 5. THIS SURVEY WAS PERFORMED Z L, '■,' ; ^�,. / Q r WOOD STAKE SET BY CLIENT WITHOUT THE BENEFIT OF A TITLE • REPORT AND DOES NOT SHOW (IF _ ANY) EASEMENTS OF RECORD. N i I:'. M1 6 tw ry 0 �, ry q c' y:•/ ry / _ a To ai` !� e� h ► h sP,"� �y 'S •'� !V !v ,1, •18 FLA"Iti 3: Cqr:CRS _ GRAVEL 6. PARCEL ONES AND ROAD RIGHT OF U .._. .• ` ' R E!•��,M ■ ■ ■ 'Owl'■ ■ ■ ■ ■ r- ■ ■ ■ ■ ■ ■ _ .._._,...._M. ,-. WAY WIDTHS SHOWN HEREON ARE T y- i J ■ ■'•� �■ / FENCE ' IN BB'S11 E / / N 8T09'tt' E 787.70'(0) FOUND BENT IRON PIPE (C) CALCULATED BASED ON MASON COUNTY 0.4' N. E CALCULATED ASSESSOR'S DIGITAL MAPPING AND ' (D) PER DEED, SEE NOTE 4 MAY BE SUBJECT TO REVISION. (n I /' / POSITION ■ ■ � PROPERTY LINE Z9 HELD FOUND IRON PIPE LL! I I AS SW CORNER LOT 8 //r I �1_7 TEST PIT SITE DATA 70- PROPOSED MAJOR CONTOUR LINE SITE ADDRESS: 72-- PROPOSED MINOR CONTOUR LINE 150 E STRETCH ISLAND ROAD, GRAPEVIEW WA DESCRIPTION ------- GRADE BREAK TOTAL PARCEL AREA 212,998 SF (4.89 AC) DISTURBED AREA 32,679 SF 0.75 AC) - - - CLEARLING UMITS ( ALL THAT POR110N OF THE GOVERNMENT LOT 9, SECTION B. TOWNSHIP 21 NORTH, RANGE 1 WEST, W.M. IN AREA TO BE LAWN/LANDSCAPING 11,868 SF (0.27 AC) MASON COUNTY, WASHINGTON. PARTICULARLY DESCRIBED AS FOLLOWS: 0 PROPOSED CONCRETE DRIVE AREA TO TO BE PASTURE 16,161 SF 0.37 AC) SHEET INDEX -SO-SD- PROPOSED STORM PIPE BEGINNING AT THE MEANDER CORNER BETWEEN SECTION 5 AND 8 ON THE WEST SIDE OF STRETCH ISLAND, P;30POSED IMPERVIOUS AREA WHICH IS A 3/4" IRON PIPE; THENCE NORTH 89'58'39" EAST ALONG THE SECTION LINE BETWEEN SAID SHEET DFSCRIP710N PROPOSED STORM CLEAN OUT SLAG 2,260t SF SECTIONS 5 AND 8, A DISTANCE OF 558.63 FEET, MORE OR LESS, TO THE NORTHWEST CORNER OF CONCRETE 2,390t SF GOVERNMENT LOT 9; THENCE SOUTH 00'15'07" WEST ALONG THE WEST LINE OF SAID GOVERNMENT LOT 9, A C1.0 COVER SHEET -RD-RD- PROPOSED ROOF DRAIN DISTANCE OF 399.36 FEET TO THE POINT BEGINNING OF THE TRACT OF LAND HEREBY DESCRIBED; C2.0 SURVEY ■ PROPOSED CATCH BASIN, TYPE SHOWN ON PLAN VII *SITE CUT AND FILL QUANTITY CONTINUING THENCE SOUTH 00'15'07" WEST ALONG THE SAID WEST LINE OF GOVERNMENT LOT 9, A DISTANCE C3.0 EXISTING CONDITIONS & TESC PLAN Cl 1,100t/1,100t CY OF 285.55 FEET; THENCE NORTH 8T09'11" EAST 787.70 FEET; THENCE NORTH 00'15'07" EAST PARALLEL TO -SS- PROPOSED SANITARY SEWER THE WEST UNE OF GOVERNMENT LOT 9, A DISTANCE OF 271.50 FEET TO THE SOUTH LINE OF A TRACT OF C3.1 TESC NOTES AND DETAILS LAND RETAINED BY WALTER 0. ECKERT AND AUGUSTA ECKERT IN DEED DATED APRIL 30, 1951. RECORDED IN PROPOSED SANITARY SEWER CLEAN OUT ' QUANTITIES ARE APPROXIMATE VOLUME 138 OF DEEDS, PAGES 419 AND 420; THENCE SOUTH 89'46'09' WEST 227.70 FEET ALONG THE C4.0 SITE PLAN o o SEPTIC TANK NOTE: SOUTH LINE OF SAID ECKERT TRACT; THENCE SOUTH 8T31'32" WEST 559.47 FEET, MORE OR LESS, TO THE C5.0 UTILITY & GRADING PLAN IT IS THE CONTRACTOR'S RESPONSIBILITY TO POINT OF BEGINNING; C5.1 GRADING NOTES AND DETAILS ® WATER WELL DETERMINE MATERIAL QUANTITIES. THE ESTIMATES PROVIDED MUST NOT BE USED FOR BIDDING EXCEPT THEREFROM STRETCH ISLAND COUNTY ROAD. X FILTER FABRIC FENCE PURPOSES. (ALSO KNOWN AS TRACT B OF SURVEY RECORDED OCTOBER 23. 1974 IN VOLUME 1 OF SURVEYS, PAGE 115. GRASS PLANTINGS UNDER AUDITOR'S FILE NUMBER 204274). PASTURE PLANTINGS NOTE -`� N.L. Olson & Associates, Inc. THE APPROXIMATE LOCATION OF EXISTING UNDERGROUND UTILITIES Engineering, Plannin and Surveyingo4' F-� OjbSO FOR:ARE SHOWN ON THE PIONS. IT IS THE CONTRACTOR'S ES PRIOR TO g Gerald &Wendy Boles TO DETERMINE THE LOCATION OF EXISTING UTILITIES RESPONSIBILITY PRIOR TO COMMENCING WORK. THE CONTRACTOR SHALL BE RESPONSIBLE FOR P.O.BOX 224 DAMAGES THAT MIGHT BE OCCASIONED BY THE CONTRACTOR'S FAILURE p(� p,1 TO LOCATE,PRESERVE AND PROTECT UNDERGROUND UTILITIES. (360)89S-2350 or(360)8/�7 6-2284 GRAPEVIEW,WA98546 CALL48 HOURS A��A JT�719 4� (360)551-1051 tat � BEFORE YOU DIG 2453 Bethel Avenue,P.O.Box 637,Port Orchard,WA 98366 �r$OMALENGw BUTCH.BOLES@GMAIL.COM JU Y 5'0 811 C-�&Oz/6 - o 6(k 5 Mason Countv Department of Community Development Submittal Checklist For a Geological Assessment Instructions: This checklist 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 Gerald &Wendy Boles Parcel# 12108-75-00080 Site Address 150 E Stretch Island Road N, Grapeview ,, 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) Z «••mil 3 (2) (a)A discussion of the ground water conditions at the site, RECEIVED Located on page(s) 2 SEP 15 2016 (b) A discussion of the estimated depth to water ,. Alder Street Located on page(s) 2 (c) A discussion of the quantity of surface seepage Located on page(s) (d) A discussion of the upslope geomorphology Located on page(s) 3 (e) A discussion of location of upland waterbodies and wetlands. Located on page(s) 3 (3) The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand. Located on page(s) 7— (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 downslope movement, etc.). Located on page(s) Z (5) A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and records. Z Located on page(s) (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. 3 Located on page(s) (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. Page 1 of 2 Form Effective June 2008 Located on page(s) 3 (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 develop t, Located on Map(s) (b) the boundaries of the landslide hazard area (top, both sides, and toe), Located on Map(s) l'( /4 (c) the associated buffers(top, both sides, and toe) Located on Map(s) A (d) building or other setbacks (top, both sid s, and toe). Located on Map(s) AllA (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 the site. Located on Map(s) I, hereby certify under penalty of perju that I am a civil engineer licensed in the State of Washington with specialized knowledge of eotechnical/geological engineering or a geologist or engineering geologist licensed in the State of Washington with special knowledge of the local conditions. I also certify 1 that the Geological Assessment, dated A,q, .?/THY , and entitled Se4m /-hSSPss y�„'1 &4QA4 ifi eC-'Si!>CS.6/CC, meets all the requirements of the Mason Co y 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) Sti of wns�iiy ';.e, a R�c9R�oG��w�v SSIONAL Disclaimer: Mason County does not certify the quality of the work done in this Geological Assessment. Page 2 of 2 Form Effective June 2008 APPENDIX A ' II Mason County Department of Community Development Submittal Checklist for a Geological Assessment Instructions: This checklist 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 PP P should explain the basis for the conclusion. Applicant/Owner Gerald & Wendy Boles Mason County Parcel #:12108-75-00080 SITE ADDRESS: 150 EAST ISLAND ROAD NORTH (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) 2&3 (2) (a) A discussion of the ground water conditions at the site. Located on page(s) 2 (b) A discussion of the estimate depth to water Located on page(s) 2 (c) A discussion of the quantity of surface seepage Located on page(s) 2 (d) A discussion of the upslope geomorphology Located on page(s) (e) A discussion of location of upland waterbodies and wetlands. Located on page(s) 3 (3) The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand. Located on page(s) 2 (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 downslope movement, etc.). Located on page(s) 2 (5) A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and records. Located on page(s) 2 (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) 3 (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) 3 I (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) N/A (b) The boundaries of the landslide hazard area (top, both sides, and toe), Located on Map(s) N/A (c.) The associated buffers (top, both sides, and toe) Located on Map(s) N/A (c) Building or other setbacks (top, both sides, and toe). Located on Map(s) N/A Note: NLO has provided discussion for a building setback from a steep slope area. Our slope assessment has indicated no landslide hazard exists with in 300 feet of the area proposed for development. (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 the site. Located on Map(s) Site Plan RgiIrp 9 P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\wjohnson\project folder\Project Folder\9385 boles\geo assesment.doc (6/12/2008) Michael MacSems Geological Assessment Review Checklist 6-08.doc Page 1 G-Ep Zc) 6 - oac- G5 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: B,1'Q S Permit# riPla Irm P 0Y4 Parcel# Date(s)of the Document(s)reviewed: (1) A discussion of geologic conditions in the general vicinity of the proposed development,with geologic unit designation based on referenced maps. OK?L/Comment: ; (2) (a)A discussion of the ground water conditions at the site, OK? ✓ Comment: d' L (b) A discussion of the estimated depth to water OK? ✓ Comment: 7 (c) A discussion of the quantity of ace seepage OK? �/ Comment: Le,{Icy (d) A discu sion of the upslope gepo�hology OK?Comment: /�J (e) A discussion of location of upland waterbodies and wetlands. OK? V Comment: P 3 (3) The approximate depth to hard,or dense competent soil, e.g. glacial till or outwash sand.L,� OK? ✓ Comment: 3 - -7 (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 tr s indicating downslope movement,etc.). OK?L[_Comment: 72 (5) A discussion of the history of lands iide activity in the vicinity,as available in the referenced maps and records. n OK?__Comment: �" 3 (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. OK? r Comment: (7) A recommendation by the preparer whether a Geotechnical Report should be required to further!rluate site conditions and�e�roposed 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 proposed develoert, OK? ✓ Comment: SS (b) the boundaries of the landslide hazard area(top, both sides,and toe), Page 1 of 2 Form Effective June 2008 (6/12/2008) Michael MacSems -Geological Assessment Review Checklist 6-08.doc Page 2 OK? kl Comment: JV / (c) the associated buffers(top, both sides, and toe) OK?_ Comment: A/ //'d (d) building or other setbacks(top, boi th sdes,and toe). OK?_[Comment: &) A (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 the site. OK? ✓ Comment: Are the Document(s)signed and stamped? Type and#of License: 1Y1,4 C Y)C,I&;,— ✓ r) 3 U 3 3 Ci C ? .� If not approved,what is the next action/recommendation for further action? u Reviewed by on Time spent in review: SECOND REVIEW/UPDATE: Reviewed by on Time spent in second review: 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 A APPENDIX A Mason County Department of Community Development Submittal Checklist for a Geological Assessment Instructions: This checklist 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 Gerald & Wendy Boles Mason County Parcel #:12108-75-00080 SITE ADDRESS: 150 EAST ISLAND ROAD NORTH (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) 2&3 (2) (a) A discussion of the ground water conditions at the site. Located on page(s) 2 (b) A discussion of the estimate depth to water Located on page(s) 2 (c) A discussion of the quantity of surface seepage Located on page(s) 2 (d) A discussion of the upslope geomorphology Located on page(s) 3 (e) A discussion of location of upland waterbodies and wetlands. Located on page(s) 3 (3) The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand. Located on page(s) 2 (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 downslope movement, etc.). Located on page(s) 2 (5) A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and records. Located on page(s) 2 (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) 3 (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) 3 (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) N/A (b) The boundaries of the landslide hazard area (top, both sides, and toe), Located on Map(s) N/A (c.) The associated buffers (top, both sides, and toe) Located on Map(s) N/A (c) Building or other setbacks (top, both sides, and toe). Located on Map(s) N/A Note: NLO has provided discussion for a building setback from a steep slope area. Our slope assessment has indicated no landslide hazard exists with in 300 feet of the area proposed for development. (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 the site. Located on Map(s) Rite Plan Figure 9 P.O. Box 637. 2453 Bethel Avenue • Port Orchard, Washington 98366 Phone: 1(800) 755-1282 Fax: (360) 876-1487 \\SERVER\Users\wjohnson\project folderTroject Folder\9385 boles\geo assesment doc MASON COUNTY, 1951, N0. 9 n surrounding slopes. Gradients are strong enough well as on seasonal moisture. Excessive rain late in spring or early in summer causes crops to fail. good surface drainage. Ise and suitability.—)Most of the soil'is uncleared or Hay and oats are the main crops. Truck crops are y partly cleared and is used as woodland pasture and not grown extensively because of the distance to market. grazing. The few small areas in farms are in grass Permanent pastures can be grazed well into the summer r pasture; oats are grown as some places for grain and, in many seasons, all summer long. pp few hay. The use of this soil for farming is limited by plantings his soil ofs not blueberriesthave fruits, or galthes.ough they way the lower lying valley soils are used. to this the soil is in capabi ity subclasalder, Orego Ills; it is nmaple, g for crow well, but the soil isntooewetrfor the other'Blackberries kinds Iof xed forests consisting of red berries. Reed canarygrass is suited to areas that are llow, spruce, and redcedar. difficult to drain. BELLINGHAM SERIES Ordinarily, fertilizer other than barnyard manure is not used. ost enefit reated with The Bellingham series consisccuf pupland ldep ession pl os h to ivs appl ed. bTr ckwcrops r ceivhen manuree a comp)to ,rk gray silty soils. They o py ve develop id glacial lake basins. They ha from fertilizer. Lime is rarely used on crops. 46 to for acial materials under rainfall rngingsfrom dense forest red alde This r,)Oregon-is in mapletyvillow,�sli hemlock, sprucet is , and ches per year. The nativevegetation F alder, maple, willow cedar, and an occasional spruce redcedar. nd as en. Under theo dt is Spirea tolen dgerassnse eso anld (Be).—Most of thisam soil oili s on Squaxin Island and on otay loam, 0 to 3 percent her f wild rose2 sedges, um - d Pickering drubs. Bellingham soils are are associated d with the K t ap with Bellinghamsilt oasm,g0 to 31 percent yslopes,abut 1 orgganic matter. They Rd Cloquallum soils and with other glacial soils of the differs er subsoil. 1 The lower subso subsoiltextured very dense,soil and 24 [plands. slopes IBdI—This to 34 inches from the surface it rests on dense clay sedi- Bellingham silt loam,0 to 3 percent the ,oil is widely distributed with the eastern so lsart f On the This soil is also closely associated with ounty and is associated ;he islands of Case Inlet and Pickering Passage and Use and suitability.—This soil is more difficult to drain ,)ordering the mainland, it is associated with the Lltsap more dean nse Bellingham worked under,)adverto 3 se percent ocon and is ditions. ;oils. nd The surfacre s6 t is a o 10 giranu thick. Itacontaina much yields.Otherwise, it is similar to that soil in use, crops, and gray silt loam, This soil is in capability subclass IVw• it is fair for organicbla matter eand in many small roots. t is covered bysa, hit red alder, Oregon-maple, willow, hemloc , spruce, and nearly , p redcedar. peaty layer. Under the surface soil is a plastic silt loam CARSTAIRS SERIES or silty clay loam, 4 to 8 inches thick. This layer con- The Carstairs series consists of very dark, excessive)yy and less organic m c tains fewer roots eon- natter than the layer drained soils. They occupy the nearly treeless outwash above it. At depths ranging from silt loam or silty clay loam g rades sharply tuclae light- plains in the southwestern part of the county (fig. 3).gray clay mottled with yellow,brownish yellowl andIn position and parent material, they are similar to the plastic when wet, Grove soils. Carstairs soils have developed from basic ! brown. The clay is hard when dry, p aks into fine aggregates parent material and under rainfall that ranges from 60 of d firmsuban when moist From aIt e depth of 24 to 3 inches 90 inches a year. The native vegetation dgetation consists of Al- and down to 48 to 72 inches,the T sand substratum clay.13Thiistmatethough the 1solil is su round d by'a nse forests low ,it has no to dark-gray silt loam, clay, o y overstory, except for a few lodgepole pines, Douglas-firs, rial is faintly mottled with yellowish brown to bluish plastic, dense, and massive. Below and clumps of Oregon-oak. gray and is very Carstairs soils are friable shot free, gravelly, porous, depths of 48 to 72 inches, the substratum rests on glacia and droughty. They resemble the Grove soils in being lake sediments or drift. porous, droughty, and gravelly. The are finer textured ' Areas of this Bellingham soil joining areas of CIO- mapped in uallum or Kitsap soils have a lighter colored n may places and grade ace than the Amore graduall soils ynto hot e very)looses and poroon us ) q soil and a less distinctly mottled subso subsoil and substratum. the transition from this soil to Cloqualhim or Kitsap gravelly Carstairs rs gravelly loam,0 to 5 percent slopes (Ca).-- soils is gradual. if not drained. Dense clay The surface soil is a friable, fluffy, very dark gray ' The soil is wet and swampy gravel) loam about 7 inches thick. It has a weak, fine granular structure; contains no shot; and, when mist, is in the subsoil prevents the use of file for drainage, but, b excess surface water can be removed by using regularly nearly black or very dark brown. The subsurface layer, spaced ditches in fields and at the bases of slopes. between depths of 7 and 15 inches is a friable, dark- ' _ brown gravelly loam. It has a very weak, fine, granular ' Use and suitabilityastu�reeoats, and truck crops. it p structure and contains more gravel than the surface layer. soil is suited to hay, pasoductive and ture, The subsoil extendingto a depth of 25 inches, is a very moderateeilYields and depend on adequate drainage as p friable, brown gravelly sandy loam. It is single grained � j well in summer.