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HomeMy WebLinkAbout03696 - Technical Information Report - Geotechnical . . $13ooZ-� � � , . C,�i �T � � 3� �- ' I a m Geotechnical Engineering Report Renton Highlands Starbucks Renton, Washington May 2, 2013 Terracon Project No. 81135021 Prepared for: SCM Solutions, LLC Ft. Collins, Colorado Prepared by: Terracon Consultants, Inc. Mountlake Terrace, Washington CITY O; - E,,r,��`: RECEIVED MAY 3 0 2013 BUILDING DIVISION ,� ��; :::�� ,,: i e � : . � : � � � � : , � � � � ,r�- > �,� ,�-; �>�- � .__:="> �{ .... � � i � � 3 � �� � . � 1 r�rracon May 2, 2013 SCM Solutions, LLC 1281 East Magnolia, Unit#186 � Fo�t Collins, CO 80524 Attention: Ms. Lisa Sunderland & Ms. Elizabeth Hughes RE: GEOTECHNICAL ENGINEERING EVALUATION Renton Highlands Starbucks NE 3`d Street & NE 4`h Street Renton, Washington Terracon Project No. 81135021 Dear Lisa and Elizabeth, Terracon Consultants, Inc. (Terracon) has completed a geotechnical engineering evaluation for the above-referenced project. Our services were performed in general accordance with our proposal (Terracon No. P81130056) dated February 26, 2013. This report presents the results of our evaluation and provides our geotechnical recommendations concerning design and construction issues. We appreciate the opportunity to be of service to you on this project. If you have any questions conceming our report, or if we may be of fu�ther service, please don't hesitate to contact us. Sincerely, Terracon Consultants, Inc. �S�AKK t�.�.,�18'r�� �� �� ~��� , �;.. � .�: � � ,�� � �� � � � ��` � ��2/�� � eT,6R� �'Jf9 i ,i ' � ��A �ISfti'��v�'...`� t . ' _ � IOIYAL t�u Robert W. Sargent, P.E. James M. Brisbine, P.E., L.G. Project Geotechnical Engineer Sr. Project Geotechnical Engineer Copies to: Addressee(1 PDF copy via email) Sara Martin/Sterling Design Associates (1 PDF copy via email) , i B"��;. .,., .__ �8 i!� ._ �1�._ - =� ._ ..� , J.. ._ ��� ���C..f'�Z��'.@ TE["a�� i,�s''��.C� „'? ��'.,=3 - - ,.� - .. .. , _ cC: C_^ - i : l��rr�con TABLE OF CONTENTS I EXECUTIVE SUMMARY...............................................................................................................i ' 1.0 INTRODUCTION ...................................................................................................................1 �I 2.0 PROJECT INFORMATION....................................................................................................1 2.1 Site Delineation ..................................................................................................................1 2.2 Existing Site Usage............................................................................................................2 2.3 Proposed Site Development...............................................................................................2 2.4 Scope of Work....................................................................................................................2 3.0 SITE SETTING ......................................................................................................................3 3.1 Regional Geography ..........................................................................................................4 3.2 Regional Geology...............................................................................................................4 3.3 Regional Zoning .................................................................................................................4 4.0 SITE CONDITIONS ...............................................................................................................4 ' 4.1 Development and Surtace Features...................................................................................4 4.2 Soil Stratigraphy.................................................................................................................5 4.3 Groundwater Levels...........................................................................................................6 5.0 CONCLUSIONS AND RECOMMENDATIONS......................................................................6 5.1 General Design Considerations .........................................................................................6 5.2 Site Preparation..................................................................................................................7 5.3 Spread Footings.................................................................................................................8 5.4 Slab-On-Grade Floors......................................................................................................10 5.5 Drainage Systems............................................................................................................11 5.6 Pa�ement Sections ..........................................................................................................11 5.7 Structural Fill ....................................................................................................................14 6.0 CLOSURE............................................................................................................................15 FIGURES Figure 1 — Site Location Map Figure 2 — Site & Exploration Plan APPENDIX A– Field Exploration Procedures, General Notes, and Logs APPENDIX B– Laboratory Testing Procedures, Soil Classifications and Results APPENDIX C–Supplemental Information . � Geotechnical Engineering Report 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 EXECUTIVE SUMMARY Terracon has completed a geotechnical engineering evaluation for the proposed construction of a new Starbucks coffee shop at the project site. Our scope of work included five exploratory borings, limited laboratory soil testing, geotechnical analysis, and preparation of this report. � Based on our findings, we have derived the following geotechnical conclusions and recommendations: ■ Subsurface Conditions: The entire site appears to be underlain at shallow depths (typically about 1 foot) by generally medium dense, granular soils, which we interpret as recessional outwash. One boring disclosed approximately 6 feet of loose fill soils , over the outwash deposit. None of our borings encountered groundwater within the � depths explored (about 20 feet below the surface). ■ Geo/ogica/Hazards: Based on municipal zoning maps, the site does not appear to be impacted by landslide risks, liquefaction potential, abandoned landfills, peat deposits, or other geological hazards that would adversely affect site development. E Building and F/oor Support: The proposed building walls and columns can be supported by conventional spread footings that bear on undisturbed native recessional outwash. A conventional slab-on-grade floor can be used within the proposed building if the floor subgrades are properly prepared. � Earthwork Considerations: The on-site soils are moderately silty, which renders them sensiti�e to moisture conditions and difficult to compact when wet. As such, earthwork should be performed during periods of dry weather. - Infiltration Considerations: The native recessional outwash deposit that underlies the site likely possesses a low to moderate permeability. Although percolation rates will not be high, the site does appear to offer the potential for infiltrating stormwater runoff. This summary should be used only in conjunction with the entire report for design purposes. It should be recognized that geotechnical details were not included or not fully developed in this section; as such, the report must be read in its entirety for a comprehensive understanding of the items presented above. Also, please refer to the GENERAL COMMENTS section for a discussion of the report limitations. , ' . 1��rr�con GEOTECHNICAL ENGINEERING REPORT RENTON HIGHLANDS STARBUCKS NE 3RD 8� NE 4T" STREET RENTON, WASHINGTON Terracon Project No. 81135021 May 2, 2013 1 .0 INTRODUCTION This report presents the results of our geotechnical engineering evaluation performed for the proposed construction of a Starbucks coffee shop on the subject site. The purpose of our evaluation was to provide geotechnical characterizations, conclusions, and recommendations concerning the following elements of the project: ■ Building foundations ■ Flexible pavements ■ Slab-on-grade floors ■ Rigid pavements ■ Geological hazards ■ Structural fill ■ Seismic criteria ■ General earthwork ■ Infiltration potential . Building drains 2.0 PROJECT INFORMATION The following sections present information regarding site delineation, existing site usage, proposed development features, and our geotechnical scope of work. Terracon should be notified if any significant changes are made in the proposed site location, layout, or details. 2.1 Site Delineation The project site comprises a vacant parcel located at the western corner of the intersection of NE 3�d Street and NE 4`h Street in the Highlands area of Renton, Washington. Table 1, below, summarizes our understanding of the site location and boundaries, as gained from maps, survey plans, aerial photos, team communications, and a site reconnaissance. Figure 1 shows the general site location. and Figure 2 illustrates the approximate site boundaries in relation to surrounding features. ������ _�ns. 'a�t_ �, � �1�,.`_ - �4 _ , _ ��ii!� ?rr . .,, •ak: T_ �__ ;�a:� �°�'�� _ . _.. . F .�L: • : , , � . Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 TABLE 1 SUMMARY OF PROJECT SITE DELlNEATlON Parameter General Description Township!Range/Section NE '/.of NW'/<, Sect. 16, T23N, R5E Latitude/ Longitude Lat=47.488 deg. Lon = -122.179 deg. Overall Shape: Trapezoidal. Geometry Approximate Dimensions: 130 feet x 240 feet overall. Approximate Total Area: 25,363 square feet. North Side: NE 4th Street; residential property beyond. South Side: NE 3`d Street; commercial property beyond. Visual Boundaries West Side: Abandoned gas station and parking lot. East Side: Undeveloped grassy area. 2.2 Existing Site Usage Most of the site is currently vacant and unde�eloped. However. the southwestern corner of the site is currently occupied by a parking area and sign that are associated with the adjacent abandoned gas station. 2.3 Proposed Site Development Development plans call for constructing a Starbucks coffee shop on the site. According to a conceptual layout plan, the new de�elopment will comprise a 1650-square-foot building situated in the northwestern portion of the site, with a drive-through lane extending around the northern and western sides of the building, and with an asphaltic parking lot located on the eastern and southern sides. We anticipate that foundation, floor, and pavement loads will be relatively low. It has not been determined whether stormwater runoff will be discharged into a municipal storm drain system or infiltrated on site. 2.4 Scope of Work We performed all geotechnical services in general accordance with our previously mentioned proposal. It should be noted that our authorized scope of services did not include any environmental characterization or testing of on-site soil samples. We ultimately completed the following geotechnical scope items: Reliable ■ Responsive ■ Convenient ■ Innovative 2 � � • Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 � Reviewed topographic maps, aerial photographs, surface photographs, municipal hazard , maps, and geologic maps regarding the site vicinity. � Performed a surface reconnaissance of the site and immediate vicinity. -. Advanced five exploratory borings (designated B-1 through B-5) to depths ranging up to about 21 feet below existing grades, at strategic locations across the site. � Performed limited geotechnical laboratory testing on representative samples of the near- surface soils. Analyzed subsurface conditions in relation to the proposed development, and prepared this written report. The functional locations, elevations, and depths associated with our recent on-site explorations are summarized in Table 2, and their relative locations are illustrated on Figure 2. Appendix A describes our field exploration procedures, and Appendix B describes our laboratory testing procedures. TABLE 2 SUMMARY OF SITE EXPLORATlON PROGRAM Functional Surface Termination Exploration Location Elevation Depth (feet) (feet) B-1 Proposed Building Footprint 322 21'/z B-2 Proposed Building Footprint 323 21'/ B-3 Proposed Parking Area/Drive Thru Lane 324'h 6'/z B-4 Proposed Parking Area 324% 9 B-5 Proposed Entry/Exit Area 322 6Yz Note: All exploration depths and elevations should be regarded as only approximate values. Elevation datum: Concept Plan provided by SCM. 3.0 SITE SETTING We obtained information concerning regional conditions in the site vicinity from a review of topographic maps published by the U.S. Geological Survey (USGS), geologic maps published by GeoMap Northwest, and on-line zoning maps prepared by King County. Our research findings are discussed below, and excerpts from selected maps and photo files are contained in Appendix C. Reliable • Responsive � Convenient � Innovative 3 , � Geotechnical Engineering Evaluation l��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 3.1 Regional Geography Topographically, the project site is situated on the western edge of a large upland plateau known as the Renton Highlands. Regional surface grades slope gently downward to the west across this plateau, and surface elevations range from about 320 to 325 feet (USGS datum) in the site vicinity. Judging by local topography, it appears that very little cutting and possible only minor filling was performed near the site as part of the original development of neighboring properties and streets. 3.2 Regional Geology According to the 2007 Geologic Map of King County, the site and immediate vicinity is mantled by a recessional outwash deposit. Recessional outwash typically consists of silty sands with moderate densities and a thickness ranging from a few feet to several tens of feet. The geology map shows that this su�cial soil deposit overlies a more-widespread glacial till deposit, which is exposed to the north and east of the project site. 3.3 Regional Zoning King County's on-line regional zoning maps show approximate locations where geological hazards and other Environmentally Sensitive Areas are documented or suspected. According to these maps, there are no potential or known landslide areas, wetlands, liquefaction zones, abandoned landfills, or peat deposits within or near the site vicinity. 4.0 SITE CONDITIONS Terracon representatives visited the project site several times during February and March of 2013 to evaluate surface and subsurface conditions. Due to the undeveloped nature of this site, we had no communications with the current property owners and, as a result, did not obtain any site information from them. Our geotechnical observations, measurements, findings, and interpretations are described in the following text sections. 4.1 Development and Surface Features The following paragraphs briefly discuss existing site deve�opment and surface features, as observed or inferred during our site reconnaissance. = Surface Grades: Most of the site is fairly flat, with a very gentle slope downward to the west. We observed two gently rounded high points on the site: one in the central- southern portion and another at the far northwestern edge. The site has an average surface elevation of about 324 feet (USGS datum). Reliable ■ Responsive � Convenient � Innovative 4 . Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 Pavements: Asphaltic pavement presently covers a roughly triangular area that I encompasses approximately 3000 square feet at the southwestern corner of the site. This pavement extends onto the site from the adjacent abandoned gas station. It generally appears to be in fair condition, but the thickness of the pavement is unknown. . Vegetation: Existing site vegetation includes several deciduous trees within the landscaping verge at the northern edge of the site (alongside NE 4�' Street), several evergreen trees at the northwestern edge of the site, and a clump of bushes near the northwestern corner. The remainder of the site is predominantly covered by short grasses with a few scattered deciduous trees. h, Structures: No buildings currently exist on the project site. Near the southwestern corner of the site, there is a two-leg sign that is associated with the adjacent abandoned gas station. � Utilities: We infer that the neighboring site to the west is serviced by underground sewer and water, and possibly by underground gas. The electrical service appears to be o�erhead. Utilities do not currently appear to be established on the project site. 4.2 Soil Stratigraphy Our exploratory borings revealed two shallow soil deposits below the site, as described in the following paragraphs. The boring logs contained in Appendix A and the lab sheets contained in Appendix B provide details regarding on-site soil conditions. Although our scope of work did not involve any sampling or testing for possible environmental soil contaminants, it should be noted that we did not detect any petroleum sheens or odors in any of the soil samples that we obtained. � Surficial Fill Soils: One of our five borings (B-4) disclosed a deposit of loose, gravelly, silty sand extending approximately 6 feet below existing grade. We interpret this deposit to represent a pocket of either old fill soil or reworked native soils. ■ Recessiona/ Outwash: At a depth of less than 1 foot below existing grades, our remaining four borings encountered silty, gravelly sand or gravelly sand with silt, which we interpret as native recessional outwash. This deposit ranged from loose to dense but was generally medium dense, and it extended to the termination depth of all five borings. Our grain-size analyses performed on two representative samples revealed a fines (silt and clay) content of about 4 to 12 percent, a sand content of about 56 to 65 percent, and a gravel content of about 24 to 39 percent. Measured field moisture contents ranged from about 4 to 12 percent. Reliable � Responsive e� Convenient � Innovative 5 � � Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 4.3 Groundwater Levels Our exploratory borings did not encounter groundwater at the time of drilling (March 28, 2013). However, it is likely that perched water forms atop the glacial till deposit, which we infer to underlie the site at greater depths. Over the entire site, groundwater conditions probably fluctuate with season, precipitation patterns, on-site or off-site usage, and other factors. 5.0 CONCLUSIONS AND RECOMMENDATIONS Based on our surface reconnaissance, subsurface exploration, and document research, we conclude that the proposed site development is feasible from a geotechnical standpoint, contingent on proper design implementation and construction practices. Our geotechnical conclusions and recommendations concerning general design considerations, site preparation, spread footings, slab-on-grade floors, drains, pavement sections, and structural fill are presented in the following text sections. ASTM specification codes cited herein refer to the 2010 manual published by the American Society for Testing & Materials. WSDOT codes refer to the 2012 edition of Standard Specifrcations for Road, Bridge, and Municipal Construction published by Washington State Department of Transportation. I 5.1 General Design Considerations We offer the following comments, conclusions, and recommendations concerning general geotechnical design issues affecting the overall development. Geological Hazards: King County's on-line regional maps do not show any geological hazard areas, such as steep slopes, landslide zones, peat deposits, landfills, and liquefaction zones, at or near the subject site. Our surface reconnaissance and subsurface exploration confirmed this regional mapping. Consequently, the proposed site develoqment does not appear to be constrained by anv municipal Sensitive Area Ordinances (SAO) of a Qeoloaical nature. Earthwork Considerations: Our borings and laboratory testing disclosed generally silty soils underlying the site. Because these soils are moisture-sensitive and easily disturbed when wet, we recommend that earthwork be scheduled for extended periods of drv weather. Foundation Considerations: Our borings revealed that the site is generally underlain by medium dense recessional outwash soils. These near-surface soils are adequately suited for foundation bearing due to their fairly low compressibility and moderate shear strength. We therefore conclude that conventional shallow spread footinps can be used to support the new buildinq if subQrades are properlv prepared and qrotected from weather. Reliable � Responsive �a Convenient �� Innovative 6 f . • Geotechnical Engineering Evaluation 1��rracon Renton Highlands Starbucks Renton, WA � May 2, 2013 Terracon Project No. 81135021 ' Seismic Site Class: The 2009 Intemafional 8uilding Code (IBC) assigns a seismic Site Class on the basis of geological conditions prevailing within a depth of 100 feet below the local ground surface. Although our borings did not extend to a depth of 100 feet, we infer from near-surface soil observations and from available geologic maps that the overall subsurface conditions correspond to Site Class "D" as defined bv the IBC. Infiltration Potential: Our scope of work did not include infiltration testing or analysis, but we infer from density and textural properties that the recessional outwash deposit underlying the entire site would likely offer a low to moderate percolation rate (probably on the order of 0.5 to 1.0 inch per hour). As such, the on-site soil conditions appear to be suitable for some degree of stormwater infiltration. We recommend that in-situ percolation testing and quantitative analvses be performed if the development plans call for infiltratinq some or all stormwater at the site. 5.2 Site Preparation Preparation of the project site will involve tasks such as temporary drainage, stripping, cutting, filling, erosion control, and subgrade compaction. The paragraphs below present our geotechnical comments and recommendations concerning these various issues. Temporary Drainage: Any sources of surtace or near-surface water that could potentially enter the construction zone should be intercepted and diverted before stripping or grading activities begin. We tentatively anticipate that a system of temporary curbs or berms placed around the upslope (eastern) side of the construction zone will adequately intercept most surface water runoff. However, the selection of an appropriate drainage system will depend on the water quantity, season, weather conditions, construction sequence, and contractor's methods; therefore, final decisions regarding temporary drainage details are best made in the field at the time of construction. The site is bordered by sidewalks with curbs on the uphill portions of the site and we anticipate that current surface drainage features will control most surface runoff. Clearing and Stripping: After surface and near-surface water sources have been controlled, the construction zone should be cleared and stripped of all existing pavements, slabs, sidewalks, sod, and topsoil. Stripping depths on the order of 6 to 12 inches appear adequate over most of the site, but these should be adjusted as needed to remove all root mats, tree root balls, muck, and other deleterious materials. Weather Considerations: It should be realized that if the stripping or cutting operations proceed during wet weather, greater stripping depths might be necessary to remove disturbed moisture-sensitive subgrade soils. For this reason, site earthwork is best performed during a period of dry weather. Reliable :. Responsive -� Convenient � Innovative 7 . Geotechnical Engineering Evaluation 1��rracon Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 5.3 Spread Footings Conventional spread footings can be used to support the proposed building if the subgrades are properly prepared. We offer the following comments and recommendations concerning design and construction of spread footings. In the event that unfavorable soil conditions are revealed by future excavations, then we might need to provide supplemental recommendations for subgrade impro�ements or an alternative foundation system. Footing Depths and Widths: For frost and erosion protection, the bottoms of all exterior footings should bear at least 18 inches below adjacent outside grades, whereas the bottoms of interior footings need bear only 12 inches below the surrounding slab or crawlspace level. To reduce post-construction settlements, continuous (wall) and isolated (column) footings should be at least 18 and 24 inches wide, respectively. Bearing Provisions: We recommend that all footings bear directly on firm, undisturbed, native, recessional outwash soils. In the event that localized zones of loose or soft native soils or uncontrolled fill are encountered below footing subgrades, these deficient soils should be overexcavated and replaced with suitable bearing material. This will involve overexcavating the existing soil downward as needed to reach firm native soils, and outward a commensurate distance as indicated in the sketch below. The resulting overexcavations should then be backfilled to create aggregate bearing pads in accordance with the following paragraph. (It�}11�t4t��� �{(�)It=�4l�1Vt IS(:�l(—}4( t�ll( �11�11�' 2/3D w 2� /3D � � � }I( Design Footing Level � 5t�� Compacted �ff Fill p S�� 1��=��1� r.l(�U� ��`Sl �- Bearing Pad Materials: We recommend using a fairly clean, granular soil for the aggregate bearing pads where needed beneath footings. Suitable imported materials would include "Ballast" per WSDOT: 9-03.9(1), "Gravel Borrow" per WSDOT: 9-03.14, and "Crushed Surtacing Base Course" per WSDOT: 9-03.9(3). Portions of the on-site outwash soils might also be suitable for this purpose if adequately moisture-conditioned at the time of placement. In all cases, the bearing pad materials should be compacted to a uniform density of at least 95 percent (based on ASTM: D-1557). Reliable ■ Responsive ■ Convenient ■ Innovative 8 � Geotechnical Engineering Evaluation 1��rrac�n Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 Bearing Capacities: Based on the bearing provisions described above, we recommend that all footings be designed for the following maximum allowable soil bearing capacities. These values incorporate static and transient (wind or seismic) safety factors of at least 2.0 and 1.5, respectively. Design Parameter Allowable Value Static Bearing Pressure 2500 psf Seismic Bearing Pressure 3300 psf Footing Settlements: We estimate that total post-construction settlements of properly designed footings bearing on properly prepared subgrades will not exceed 1 inch. Differential settlements between new foundation elements o�er horizontal spans on the order of 50 feet could approach 3/4 inch. In all cases, these settlements would be reduced if the actual design bearing pressures are lower than our recommended maximum allowable pressures. Footing and Stemwall Backfill: To provide erosion protection and lateral load resistance, we recommend that all footing excavations be backfilled on both sides of the footings and stemwalls after the concrete has cured. Either imported or on-site granular soils can be used for this purpose. All footing and stemwall backfill soil should be compacted to a uniform density of at least 90 percent (based on ASTM: D-1557). Lateral Resistance: Footings and stemwalls that have been properly backfilled as described above will resist lateral movements by means of both passive earth pressure and base friction. We recommend using the following allowable values, which incorporate static and transient (wind or seismic) safety factors of at least 1.5 and 1.1, respectively. Allowable base friction, which includes a safety factor of 1.5, can be combined with the respective passi�e pressure to resist static and transient loads. Design Parameter Allowable Value Static Passive Pressure 275 pcf � Transient Passive Pressure 375 pcf Base Friction Coefficient 0.4 Subgrade Verification: Footings should never be cast atop loose, soft, organic, or frozen soil, slough, debris, existing uncontrolled fill, or surfaces covered by standing water. We recommend that the condition of all subgrades be verified by a Terracon representative before any bearing pad fill is placed, and then again before any footing concrete is poured. Reliable Responsive Convenient Innovative 9 . Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 5.4 Slab-On-Grade Floors In our opinion, a soil-supported slab-on-grade floor can be used in the proposed new building if the subgrade is properly prepared. We offer the following comments and recommendations concerning slab-on-grade floors. Floor Sections: A slab-on-grade floor section typically comprises a concrete slab over a vapor barrier over a capillary break layer and, where needed, a subbase course. We recommend the following minimum thicknesses for these layers. Our specific recommendations for subgrade preparation and layer materials are discussed below. Floor Layer(top to bottom) Minimum Thickness Concrete Slab (by others) Vapor Retarder/Barrier 10 mil Capillary Break 4 inches Subbase Course 6 inches Subgrade Preparation: After the slab-on-grade floor area has been cut down to an elevation that will accommodate the appropriate layers, the exposed subgrade soils should be compacted to a firm and unyielding condition by means of a vibratory-drum roller. Any localized zones of soft, organic-rich, or debris-laden soils disclosed during compaction should be overexcavated and replaced with structural fill material. If the subgrade is prepared during wet weather, it might be advantageous to cover it with a separation geotextile (such as Mirafi 140N) before the subbase course is placed. Subbase Course: A subbase course provides structural support for a floor slab and helps to reduce long-term differential settlements. For this purpose, we recommend using imported, well-graded sand and gravel, such as "Ballast" per WSDOT: 9-03.9(1) or "Gra�el Borrow" per WSDOT: 9-03.14. Alternatively, an angular material such as "Crushed Surfacing Base Course" per WSDOT: 9-03.9(3) could be used, although these materials would likely be more expensive. In the interest of using recycled materials, it would also be acceptable to use crushed cement concrete, provided that it meets the same textural criteria as the aforementioned WSDOT materials. Capillary Break: A capillary break is a layer of relatively porous material placed beneath floor slabs to retard the upward wicking of groundwater, as well as to provide a smooth bearing surface. Ideally, the capillary break would consist of clean, uniform, well-rounded gravel, such as 5/8-inch or 7/8-inch washed rock. It would also be acceptable to use a clean, angular gravel such as "Crushed Surfacing Base Course" per WSDOT: 9-03.9(3) for this purpose. Reliable ;� Responsive � Convenient � Innovative 10 � � � I Geotechnical Engineering Evaluation 1��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 Floor Settlements: If the subgrade and floor layers are properly constructed, we estimate that I total post-construction settlements of the slab-on-grade floor will not exceed 3/4 inch. Differential settlements across the length of the floor could approach one-half of the actual total settlement. Subgrade Verification: Floor slabs should never be cast atop loose, soft, organic, or frozen soil, slough, debris, existing uncontrolled fill, or surFaces covered by standing water. We recommend that the condition of all subgrade areas be verified by a Terracon representative before any underslab fill is placed, and then again before the slab is poured. 5.5 Drainage Systems In our opinion, the new development should be provided with permanent drainage systems to reduce the risk of future moisture problems. We offer the following recommendations and comments for drainage design and construction purposes. Foundation Drains: We recommend that the building be encircled with a perimeter foundation drain to collect exterior seepage. This drain should consist of a 4-inch-diameter rigid, perforated pipe within an envelope of pea gravel or washed rock, extending at least 6 inches on all sides of the pipe. The gravel envelope should be wrapped with filter fabric (such as Mirafi 140N) to reduce the migration of fines from the surrounding soils. Ideally, the drain invert would be installed no more than 8 inches above or below the base of the perimeter footings. Subfloor Drains: Based on the groundwater conditions obsenred in our site explorations, we currently do not infer a need for drains beneath floor slab if the foundation drains are properly installed. Howe�er, the final decision regarding the need for subfloor drains should be made at the time of construction, after the floor subgrade has been exposed and the foundation walls have been cast. Runoff Water: Roof downspouts, parking lot drains, and drains from any other runoff surfaces should not be tied into the perforated piping system of the foundation drain. Instead, the runoff water collected from such sources should be routed through a separate tightline piping system. Also, final site grades should be sloped so that surface water flows away from the building rather than ponding near the foundation walls. 5.6 Pavement Sections We anticipate that some combination of flexible and rigid pavements will be used in new parking lot and drive-through lane. The following comments and recommendations are given for pavement design and construction purposes. Soil Design Values: Soil conditions can be defined by a California Bearing Ratio (CBR), which quantitatively predicts the effects of wheel loads imposed on a saturated subgrade. Although Reliable � Responsive � Convenient � Innovative 11 , • , Geotechnical Engineering Evaluation ���rr�COn Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 our scope of work did not include a CBR test on the surficial site soils, we infer from our limited textural testing that a CBR value of 10 to 15 would likely be appropriate for pavement design purposes. Correlation charts indicate that this CBR range corresponds to a subgrade reaction modulus range of about 200 to 250 pci. Traffic Design Values: Traffic conditions can be defined by a Traffic Index (TI), which quantifies the combined effects of projected car and truck traffic. Although no specific traffic data was available at the time of our analysis, we estimate that a TI of 3.0 to 4.0 would likely be appropriate for the car-parking lot and drive-through lane. A slightly higher TI of about 5.0 appears appropriate for an access driveway subjected to daily deliveries by small freight trucks, but this does not accommodate frequent use by heavy freight trucks. Flexible Pavement Sections: A flexible pavement section typically comprises an asphalt concrete pavement (ACP) over a crushed aggregate base (CAB) over a granular subbase (GSB). Although the GSB can be omitted in certain cases, we infer that it is beneficial at this site in order to mitigate the moisture-sensitive subgrade conditions. Our recommended minimum thicknesses for flexible pavement sections, which are based on the aforementioned design values and a 20-year lifespan, are shown below. Minimum Thickness Flexible Pavement Layers (top to bottom) Parking Lot 8 Light-Truck Drive-Thru Driveway Asphalt Concrete Pavement(ACP) 3 inches 3'/2 inches Crushed Aggregate Base(CAB) 3 inches 4 inches Granular Subbase (GSB) 6 inches 6 inches Rigid Pavement Sections: A rigid pavement section typically comprises a cement concrete pavement (CCP) over a crushed aggregate base (CAB) over a granular subbase (GSB). Although the GSB can be omitted in certain cases, we infer that it is beneficial at this site in order to mitigate the moisture-sensitive subgrade conditions. Our recommended minimum rigid pavement sections, which are based on the aforementioned design values, are shown below. Minimum Thickness Rigid Pavement Layers (top to bottom) Parking Lot& Light-Truck Drive-Thru Driveway Cement Concrete Pavement(CCP) 5 inches 6 inches Crushed Aggregate Base(CAB) 2 inches 2 inches Granular Subbase (GSB) 6 inches 6 inches Reliable � Responsive � Convenient � Innovative 12 . • Geotechnical Engineering Evaluation 1��rracon Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 Subgrade Preparation: All pavement subgrades should be compacted to a firm and unyielding condition before any pavement layers are placed. We recommend using a vibratory roller in granular (sand or gravel) subgrade areas and a static roller in cohesive (silt or clay) subgrade areas. The resulting subgrade condition should then be verified by proof-rolling with a loaded dump truck or other heavy construction vehicle, in the presence of a geotechnical representative. It should be specifically noted that boring B-4 disclosed up to 6 feet of loose fill soils. We recommend that this existing fill material be overexcavated and then either be recompacted (if properly moisture conditioned) or be replaced with imported granular material. Granular Subbase: We recommend that all GSB material consist of imported, well-graded sand and gravel, such as "BallasY' per WSDOT: 9-03.9(1) or "Gravel Borrow" per WSDOT: 9- 03.14. In the interest of using recycled materials from on-site or off-site sources, it would be acceptable to substitute up to 20 percent of the GSB with crushed asphalt concrete or up to 100 percent of the GSB with crushed cement concrete, provided that the final mixture meets the same textural criteria as the aforementioned WSDOT materials. Regardless of composition, all GSB material should be compacted to a minimum density of 95 percent based on the Modified Proctor maximum dry density (per ASTM: D-1557). Crushed Aggregate Base: We recommend that all CAB material conform to the criteria for "Crushed Surfacing Base Course" per WSDOT: 9-03.9(3). In the interest of using recycled materials from on-site or off-site sources, it would be acceptable to substitute up to 20 percent of the CAB with crushed cement concrete, provided that the final mixture meets the same textural criteria as the aforementioned WSDOT material. Regardless of composition, all CAB material should be compacted to a minimum density of 95 percent based on the Modified Proctor maximum dry density (per ASTM: D-1557). Asphalt Concrete Pavement: We recommend that the ACP aggregate gradation conform to the control points for a 'h-inch mix (per WSDOT: 9-03.8(6)) and that the binder conform to PG 58-22 criteria (per WSDOT: 9-02.1(4)). We also recommend that the ACP be compacted to a target average density of 92 percent, with no individual locations compacted to less than 90 percent nor more than 96 percent, based on the Rice theoretical maximum density for that material (per ASTM: D-2041). Cement Concrete Pavement: We recommend using Portland cement concrete with a minimum compressive strength of 4,000 psi and a minimum rupture modulus of 580 for the CCP. We also recommend that the concrete be reinforced with a welded wire mesh such as W2-6x6. positioned at a one-third depth within the layer. Compaction Testing: Compaction of the CAB and GSB layers should be verified qualitatively by method observations, proof-rolling, and hand-probing, as well as quantitatively by nuclear densometer testing. Compaction of the ACP should be quantified by laboratory testing of core samples, along with in-situ nuclear densometer testing. Reliable � Responsive y: Convenient � Innovative 13 • � , Geotechnical Engineering Evaluation Renton Highlands Starbucks Renton, WA 1��rr�con May 2, 2013 Terracon Project No. 81135021 Pavement Life and Maintenance: It should be realized that asphaltic pavements are not maintenance-free. The foregoing pavement sections represent our minimum recommendations for an average level of performance during a 20-year design life; therefore, an average level of maintenance will likely be required. Furthermore, a 20-year pavement life typically assumes that an overlay will be placed after about 10 years. Thicker asphalt, base, and subbase courses would offer better long-term performance, but would cost more initially; thinner courses would be more susceptible to "alligator" cracking and other failure modes. As such, pavement design can be considered a compromise between a high initial cost and low maintenance costs versus a low initial cost and higher maintenance costs. 5.7 Structural Fill The term structural fill refers to any materials placed under foundations, retaining walls, slab-on- grade floors, sidewalks, pavements, and other such features. Our comments, conclusions, and recommendations concerning structural fill are presented in the following paragraphs. Structural Fill Materials: For general use, a well-graded mixture of sand and gravel with a low fines content (commonly called "gravel borrow" or "pit-run") provides an economical structural fill material. For specialized applications, it may be necessary to use a highly processed material such as crushed rock, quarry spalls, clean sand, granulithic gravel, pea gravel, drain rock, controlled-density fill (CDF), or lean-mix concrete (LMC). Recycled asphalt or concrete, which are derived from pulverizing the parent materials, are also potentially useful as structural fill in certain applications. Soils used for structural fill should not contain any significant amount of organic matter or debris, nor any individual particles greater than about 6 inches in diameter. Soil Moisture Considerations: The suitability of soils used for structural fill depends primarily on their grain-size distribution and moisture content when they are placed. As the fines confent (that soil fraction passing the U.S. No. 200 Sieve) increases, soils become more sensitive to small changes in moisture content. Soils containing more than about 5 percent fines (by weight) cannot be consistently compacted to a firm, unyielding condition when the moisture content is more than 2 percentage points above or below optimum. On-Site Soils: Because only minor cuts are planned for the site after surface stripping, we expect that only small quantities of on-site native soils will be generated during earthwork activities. Most or all of these on-site soils will likely consist of sands with gravel and a variable I, silt content. Depending on the silt content, most on-site soils will likely be reusable during dry ' weather, but they are moderately moisture-sensitive will be difficult to reuse during wet weather. Any zones of organic soil should be excluded. Wet-Weather Earthwork: As discussed above, most of the on-site nati�e soils would be difficult to reuse as structural fill during wet weather. Consequently, the project specifications Reliable ■ Responsive ■ Convenient ■ Innovative 14 , • , Geotechnical Engineering Evaluation l��rr�con Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 should include provisions for using imported, clean, granular fill. As a general structural fill material, we recommend using a well-graded sand and gravel such as "BallasY' or "Gravel Borrow" per WSDOT: 9-03.9(1) and 9-03.14, respectively. For combined structural fill and drainage purposes, a relatively clean and uniform angular material such as "Crushed Surfacing Base Course" per WSDOT: 9-03.9(3) is preferable. Fill Placement and Compaction: Structural fill materials should be placed in horizontal lifts not exceeding about 12 inches in loose thickness. Unless stated otherwise in this report, we recommend that each lift then be thoroughly compacted with a mechanical compactor to a uniform density of at least 90 percent, based on the Modified Proctor test (ASTM: D-1557). Compaction is not necessary for certain structural fill materials, such as pea gravel, drain rock, quarry spalls, CDF, and LMC. Subgrade Verification and Compaction Testing: Regardless of material or location, all structural fill should be placed over firm, unyielding subgrades prepared in accordance with our various recommendations for site preparation. The condition of all subgrades should be verified by a Terracon representative before soil or concrete placement begins. Also, fill soil compaction should be verified by means of in-place density testing, hand-probing, proof-rolling, or other appropriate methods pertormed during fill placement so that the adequacy of soil compaction efforts may be evaluated as earthwork progresses. 6.0 CLOSURE Terracon should be retained to review the final design plans and specifications so comments can be made regarding interpretation and implementation of our geotechnical recommendations in the design and specifications. Terracon also should be retained to provide observation and testing services during grading, excavation, foundation construction, and other earth-related construction phases of the project. The analysis and recommendations presented in this report are based upon the data obtained from the explorations performed at the indicated locations and from other information discussed in this report. This report does not reflect variations that may occur between explorations, across the site, or due to the modifying effects of construction or weather. The nature and extent of such variations may not become evident until during or after construction. If variations appear, we should be immediately notified so that further evaluation and supplemental recommendations can be provided. The scope of services for this geotechnical project does not include either specifically or by implication any environmental or biological (such as mold, fungi, and bacteria) assessment of the site, nor any identification or prevention of pollutants, hazardous materials or conditions. Our companion Phase 1 environmental report should be consulted regarding such information. Reliable � Responsive �: Convenient � Innovative 15 . Geotechnical Engineering Evaluation 1��rracon Renton Highlands Starbucks Renton, WA May 2, 2013 Terracon Project No. 81135021 This report has been prepared for the exclusive use of our client, for specific application to the currently proposed project, and in accordance with generally accepted geotechnical engineering practices. No warranties, either express or implied, are intended or made. Site safety, excavation support, and dewatering requirements are the responsibility of others. In the event that changes in the nature, design, or location of the project as outlined in this report are planned, the conclusions and recommendations contained in this report shall not be considered valid unless Terracon reviews the changes and either verifies or modifies the conclusions of this report in writing. Reliable ■ Responsive • Convenient s Innovative 16 � , 'yC fi�F� ��. _ � �y_- 4,!5'. - � . ( '�: � ^, �. a " N ��ai rC - '4� , _ I �-7 � � `��� u� y�-,�t��_ � T - _ � .� _ ...�.,. - : � " � � � 1 � ti 1 S?'j��J � ' �'�'lq�, � '`�i�' G ,� � J t�F �t��P; Y �, �"r�s.� ��' ? � ��� m .:, _.at_ ;°y ti 'L �'ir'` �'C�� _ C� ,� .5 � ,=i �i� ����� t , �, ,� �,.,- �.'�''��ti15�r �" ,�' ,i�-.;� - H�ils Fark � �' � ±! - ,���` t A _^ � �8�'•� f''�� � r: ,-�F=.a`h.?r c �,- - ' - t•,F df', ..- F'er'.�:,ti � _. ,i�, ..Ni":. �.a S'� `_rr;-r; � r��er,�-- � � f-;i-�. . `� :, i:F- -�i.:.�:, ■ r1 . -. � H �r�r�l,�r:,.�� 4= _ L =�o�.� —����1�� — f?:�nt,�:n �.�i`���� y"t''ti^ti�� : ., t r-,:�j�:s.� r���1a- 'td i� t� ` , ,� ., i � � i•- ��3'f�'�t � t�,F .�ri�., :;` � '�'� �;�d r,,, t� �,i � � � :?:.���€, n• 1' �tr �a f7 ,;�:- m �1����i I ti�' �s�1 '� ' � .t.�fl'IC �f�j' ��Y. �4f+y- m �a_- M y 5� � i t���� � ��• - .�C�� � �n�Af �!�„c�"` j �� ��rk �`���_. �2ne vi � �'�� _E _ ,.i '1 =.,� +..s���,�'�,. t'`�.� "L ?':�,;,r L'�` �'-t� _-,, , , . �= �`� t . . � *��V�f lt���{f'tr 1.�4 ('�_ a�rk ��ft'y� i�t�� a'�'}��, � °f.��_ y� ���r= � 'r=�e Map data C2013 Google _.e.' , P�,�_,M�9, �.R��No �E �N� �N�� FIG. Nc Rws 8„3502, 1 t'�rrac� °"�'B; "'� Renton Highlands Starbucks RMS NottoScale �hK�a�� Fee,�o ConsW6ngEngineersandSdenbsts JMB Te�F� S. Renton, Washington � �vede; ca�e z����E<„,we��e�.s��oo ������raa�e�•,�=�.: pranarari fnr• C(:M Cnlirtinne I I C: . NE 4TH ST. ----- __ - — _ — __-� --- — - — - --- � � — -- — --- -- ��. �__ -� r -s�. � - �� � ;_� r � - � ' � — .���� � -- � �`-- B-2 � � 0 Bs --- O � -- � , ; ; I a : I --- � � B-� O I = � � _ 1 �� �.� I O , ------- / . . � , I B� o i, � �� � � � ° ' � � � � . :� , , ., _� , � . ,: � � � , --- , N � , ,.,_ �,�. � o _ , e- , , `� � , � I , , � I __ � ii � , . , i I � , � � � 30 0 10 20 3( l�3daC SCkLE IN FEET �B-1 BORING NUMBER AND Basemap DWG file provided by Steriing APPROXIMATE LOCATION Design Associates and modified by Terracon. P�°"�'",¢ Rws '"R""° 81135021 SITE AND EXPLORATION PLAN FIG. Nc °'a""a' R�s S�k AssHowN ���«�� Renton Highlands Starbucks ��x�xe� Fk w Consult�ng Engineers and Sden6sts �Ma Te�F Renton, Washington 2 apprc�eee; cai= ns�[[:nae�r.n se�x� r.�u,�ate-an-e;�a.nxma pranarari fnr• �('.M .Cnliitinnc � � r APPENDIX A FIELD EXPLORATION PROCEDURES, NOTES, AND LOGS 81135021 � € 1 FIELD EXPLORATION PROCEDURES The following paragraphs describe our procedures associated with the on-site subsurface explorations and field tests that we conducted for this project. Interpreti�e stratigraphic logs of our auger borings are enclosed in this appendix. Our scope of work did not include a precise survey of each exploration location. Instead, all horizontal positions were determined by pacing or taping distances from existing site features, and all depths were referenced to existing site grade. As such, the locations and depths given in the report text, shown on the report figures, and stated on the stratigraphic logs should be considered accurate only to the degree implied by our measuring methods. Auaer Borinqs All borings were advanced with a hollow-stem auger, using a track-mounted drill rig operated by an independent drilling firm (Boretec-1, Inc.) working under subcontract to Terracon. As each boring was completed, the borehole was backfilled with suitable materials and the surface was patched with asphalt or concrete. Excess soil cuttings were deposited on site in discreet locations. A geotechnical specialist from our firm continuously observed the borings, logged the subsurface conditions, and collected representative soil samples. Throughout the drilling operation, soil samples were obtained at 2'/2- �r 5-foot depth intervals by means of the Standard Penetration Test (SPT) per ASTM: D-1586. All samples were stored in watertight containers and later transported to our laboratory for further visual examination. Interpretive stratigraphic logs of our explorations are enclosed in this appendix. 81135021 � � GENERALNOTES DRILLING 8 SAMPLING SYMBOLS: SS Split Spoon-1��8"I D_2' G D,unless ether��ise�oted HS Haila:.Ste�n Auger ST Thin-4Valled Tube-2"O.D.,unless aihenvise notetl PA: Pov:er Auger RS: Ring Sampler-2.42"I.D..3"O D.,uniess othern�se noted HA: Hand Auger C�6 Diamond Blt Conng-4' N,B RB: Rock Bit 6S: Bulk Sample or Auger Sample WB: NJash Bonng or�,Aud Rota^� The number of blrnns reqwred to advance a starxlard 2-inch O D split-spoon sampler (SS)the last 12 inches ef the total 1?•-inch penetrabon w�th a 140-pound hammer falling 3Q inches is considered the Standard P�n�tration'or�N-value'. WATER LEVEL MEASUREMENT SYMBOLS: 4"JL Water Leve1 WS: 1Yhtle Sampling N:E Not�nco�ntered ti'VCI VJet Cave in WD: Whle Onlling DCi Dry Cave in BCR: Before Cas�ng Removal AB After Bonng ACR: ARer Casing Removal VJater levets indicated on the bonng logs are the leveis measured in the bonngs at the times indicatetl. Groundwater Ieveis a?ether 5mes and ott�er locations across the site couid varV. in pervious sals,the indicated levels may reflec[the localion af groundwater. In low permeabiiity soils.the acwrate cletermination of groundwater levels may not be possible with onry short-term observations DESCRIPTIYE SOIL CLASSIFICATION: Sal classification is basetl on the Unified ClassiflcaUon S�^stem. Coarse Graine� Scils have more than 50°b of their dry weighl retained on a#200 s�eve; their pnncipal descnptors are: boulders, cobbles, gravel or sand Fme Grained Soiis have less than 50%of their dN weight retained on a#2D0 sieve:they are pnnclpall��descnbed as days if they are plastic. a�silts if the��are slghtly plastic or non-plastic. PAapr constituents may be added as modifiers and minor cons(duents may!ae ad�ed accortling to the reladve proportians based on grain size. In addilion to gradation coarse-grame�soils are deflned on tne bas�s c`their in-place relafive densit�•and fine-gramed soils on the bas�s oi their consistency. CONSISTENCY OF FINE-GRAINED SOILS RELATIVE DENSITY OF COARSE-GRAINED SOILS Standard Unconffned Penetration or Standard Penetratfon Compressive N-value(SS) or N-value(SS► Strenath.Qu,qsf Blows/Ft. BlowslFt. Consistencv Relative Densiri <`00 Q Very•Son 0-3 '��ery Loose 500 - 1,�00 2-3 Soit 4-5 Loose 1 D01 - 2.000 4-5 Medium Stiff 10-29 f.ledium Dense 2.001 - 4.000 7-12 Stiff 30-45 Dense 3 001 - 8.000 13-25 ��ery Stiff 50+ Very•Densr 8 OOQ+ 26+ Hard RELATIVE PROPORTIONS OF SAND AND GRQVEL GRAIN SIZE TERMINOLOGY Descn�tive Term(sl of other Percent of Mafor Com�onent constituents Drv Weiaht of Samele Particle Size Trace � 15 6ouiders Ov�r 12 in t3QOmm) With 15-25 CobUles 12 in tc 3 in_(300mm to 75 mm) �.todifier >30 Gravel 3 in.to+*»sieve(75mm to 475 mm) Sand �cd to#200 sieve(4.75mm to 0.075rnm) RELATIYE PROPORTIONS OF FINES Silt or Clay Passing�200 Sieve(O C75mmi Descri�tive Termis)of other Percent of PLASTICITY DESCRIPTION constituents Dry Wefght Term Plasticitv Index Trace � Non-plastic 0 ti"Jith P�_12 Low 1-10 Modifiers > 12 Medium 11-30 Hgh 30+ 1 r�rr�con 81135021 I , • BORI NG LOG NO. B-1 Page 1 of 1 PROJECT: Renton Highlands Starbucks CLIENT: SCM Solutions, LLC Ft. Collins,CO SITE: NE 3rd and NE 4th Street ' Renton,WA c� LOCATION See 6diibit A-2 �� w -- w0 a c r e O = J Q w d' �J W~ 1 LL Z a a W� J � �� a F d d J � SuRace Elev.:322(Ft.) o ¢m a o '�� 3� a 3 0 � � c� �Pni ELEVAl10N Ft. — os FILL-SILN,GRAVELLY SAND(SMI.gray-brown,moist szts ° SILTY.GRAVELLY SAND TO GRAVELLY SAND WITH SILT(SMI,gray,medium � dense to dense,moist g o` '�� '' 6 �a9 11 �a N=17 � _ 'a j� 5 o' '`;��" 14 a-ia�� �e� N=2� >� - a, . �i }; 8 N�34� 7 12 0 e � 10.0 312 .� --_ _ _ GRAVELLY SAND WITH SILT fSM1,mottled orangegray-bravn,medium dense. &12-13 moist 12 N=25 12.0 310 POORLY GRADED SAND(SPI,trace sitt and gravel,gray,medium dense.moist to wet , � 1 - - �8 &9 8 8 N=17 2 �s 8-��-�2 o zta 3oo.s N=23 � 8oring Terminated at 21.5 Feet a z � & 0 � 0 � LL O w Q Strabficabon lines are approbmate In-situ,the transiGon may be gradual. Hammer Type: cathead � Groundwater not obsened ATD a a w '� Advancement Method: Notes�. " HSA 0 ¢ > r - � AbBndOfYflCfll�Aethod: � C� � WATER LEVEL OBSERVATIONS z - 1��rracon BoringSlarted 328�2013 BoringCompleted 3�282013 � Om - Dnll Rig:tradc Dnller Boretech � - - -- - Zt?."i,'.iath A�e t J Sc��,te 1(x7 = 1.1-�u^�'�.�.-;G...-...r.,��� ',':�:�-��� �.�.;�i Pro�ect No�.81135021 6diibit: A� � , • BORI NG LOG NO. B-2 Page 1 of� PROJECT: Renton Highlands Starbucks CLIENT: SCM Solutions, LLC Ft. Collins,CO SITE: NE 3rd and NE 4th Street Renton,WA c� LOCATION See 6tiibit A-2 � w — JZ ` r e U V O O ^ w H H > W H �� c = J Q w � F J W Z l i d H K� J j �� Q w C � Surface Elev.:323(R.) o Q m Q O �� �� a 3 a � � c� DEPTH ELEVATION Ft. — -o s FILL-SILTY.GRAVELLY SAND(SMI.gray-broNm,moist 322.5 SILTY.GRAVELLY SAND TO GRAVELLY SAND WITH SILT(SMI,gray to �I gray-brown,medium dense to dense,mast :( 6 11-13-18 7 N=31 5 18 6-9-11 4 4 N=20 t,, 12 �-9-10 4 N=19 1 % 12 7-13-16 N=29 �s.o 3oe 15 SAND[SPI,trace gravel,trace to with silt,gray-brovm,medium de�se,moist �8 9 �8 N=17 2 � '' �s �0-�3-�a 0 2t5 301.5 N=27 a � Boring Terminated at 21.5 Feet a z c� � 0 � 0 � LL � W � Stratification lines are appropmffie.Ir�siN,ihe transition may be gradual. Hammer Type: cathead a Groundwater not obsened ATD �� w LL Pdvancemerrt Method: Notes: i 0 HSA J � F � Abandonment Method: � c� 0 � WATER LEVEL OBSERVATIONS Z ---- Boring Started:3/2&2013 Boring Completed:3r28l2013 � - �rr�con - --- o _ __ _ __ _ __ m a;u w9 ,� Q;u�e«�,�r, ✓> -- - 2i90554th,ave l'v.Su,?et�� i �� ��9o;�nr.ake-erac� !�^;aeh�oq;o�� Projeci No.:81135021 Ediibit A-5 , • BORI NG LOG NO. B-3 Page 1 of 1 PROJECT: Renton Highlands Starbucks CLIENT: SCM Solutions, LLC Ft.Collins, CO SITE: NE 3rd and NE 4th Street Renton,WA c9 LOCATION See E�ibit A-2 �Z w � _, o a O � W F- H � w J W~ � S _ � W ~ W a Q w Ww a o �w �z m � Surface Elev.:3245(Ft.) O Q m Q w '�� � a DEPTH ELEVAl10N FL 3� � � — `0.5 FILL-SILTY.GRAVELLY SAND(SMI.gray-brown,mast 32a GRAVELLY SAND(SMI,with silt,gray-brown.medium dense to dense,mast ; 14 15-13-18 4 N=31 5 ,z: 18 a-9-7 4 6.5 318 N=16 Boring Tenninated at 6.5 Feet � 0 w � a z c� � 0 � 0 � 0 w Q Stratification lines are approzmate.ln-situ.the transilion may be gradual. Hammer Type: cathead � Groundwater nol obsen�ed ATD a a w � Advancement Mefhod: ry��: `—` HSA 0 < > � � Abandonment MeThod: � c� 0 WATER LEVEL OBSERVATIONS Z -- Boring Staried:3J28I2013 Boring Completed:3/28I2013 � 1��rr�con _- -- m _ -- �riu w9:aac� a;uer eore,eu, � 2i�564ih A�e !^!.Swte�00 � � �.1��u�-�'!ake Terrace S'Ja�hinaton Prqect No._81135021 6diibit: A-6 � • BORI NG LOG NO. B-4 Page 1 of� PROJECT: Renton Highlands Starbucks CLIENT: SCM Solutions, LLC ' Ft. Collins, CO SITE: NE 3rd and NE 4th Street Renton,WA c� LOCATION See E�ibit A-2 �Z w � � � w� � wr �� a� U � = J Q w �J W Z l LL Q W a W ww a �w �Z � � Surface Elev.:324.5(Ft.) O a m Q �� O a DEPhi ELEVATION Ft. 3 O � — 'o.e FILL-SILTY.GRAVELLY SAND fSMI,gray-brown,moist sza FILL-GRAVELLY.SILTY SAND(SM1,brown,loose,mast to wet 12 5 — � 6.0 318.5 11 GRAVELLY SAND(SPI,trace to with silt,gray-brown,medium dense.mast to wet _ 9.0 315.5 Boring Terminated af 9 Feet � 0 w � a z c� � 0 � 0 � 0 w Q Stratification lines are approbmffie.Ir�situ,the transilion may be gradual. Hammer Type: cathead � Groundwater rwt obser�ed AlD a a w '� Advancement Method: Notes `—` HSA � a > � � Abandaiment Method: � � O WATER LEVEL OBSERVATIONS Z -- -- Boring Started:3128I2013 Boring Completed:3/28J2013 � 1��rr�con - m Drill Rig:track Driller:BwetecFt � 2�90554ih Ave V'J.Suite 100 ---- -- --- -. ..- _ . F �.'buntlake Terrace.1Nashingten Prqect No.:81135021 6diibit A-7 . r BORING LOG NO. B-5 Page 1 of� PROJECT: Renton Highlands Starbucks CLIENT: SCM Solutions, LLC Ft. Collins, CO SITE: NE 3rd and NE 4th Street Renton,WA c� LOCATION See 6triibit A-2 �� w � ^ wZ a r o V LL. WO H W F �� c = J Q w F.J W Z ILL a F 4'� J �� Q w C � Surface Elev.:322(Ft.) o Q m Q �� �O a �PTM ELEVATION FL 3� � U — '0.5 FILL-SILTY.GRAVELLY SAND(SMI,gray-brown.moist 321.5 GRAVELLY SAND{SP-SM�,trace to with silt,gray,medium dense,moist �'�'� 5 5 X 6 6.5 315.5 Boring Terminated at 6.5 Feet � 0 w � a z � � 0 � 0 � � LL 0 w Q Stra6fica6on lines are approbmate.In-situ,the Vansition may be gradual. Hammer Type: cathead � Groundwaler not obsen,ed ATD a a w � Advancernent Method: Notes: " HSA 0 a > � � Abandonmeni Metl�od: � C� O WATER LEVEL OBSERVATIONS z 1��rr�con Bonng9tarted 3/28/2013 BoringCompleled 3/26/2013 � � Drill Ri :track Driller:Boretech m m ----� - --_. . ._--- ---- � �r c,.,�,n�, --� --- ,,�, : - - _ . ._ ._._ .. _ ._ , „�., . ., � -� � • � APPENDIX B LABORATORY TESTING PROCEDURES, CLASSIFICATIONS, AND RESULTS 81135021 . + LABORATORY TESTING PROCEDURES The following paragraphs describe our procedures associated with the laboratory tests that we conducted for this project. Our test results are enclosed in this appendix and/or are shown on the exploration logs contained in Appendix A. As part of our testing program, the samples were examined in our laboratory and classified in accordance with the attached General Notes or the Unified Soil Classification System (USCS), based on the texture and plasticity of the soil. A brief description of the USCS is included with this appendix. Visual Classification Procedures Visual soil classifications were conducted on all samples in the field and on selected samples in our laboratory. All soils were classified in general accordance with the United Soil Classification System, which includes color, relative moisture content, primary soil type (based on grain size), and any accessory soil types. The resulting soil classifications are presented on the exploration logs contained in Appendix A. Moisture Content Determination Procedures Moisture content determinations were performed on representative samples to aid in identification and correlation of soil types. All determinations were made in general accordance with ASTM: D-2216. The results of these tests are shown on the exploration logs contained in Appendix A. Grain Size Analvsis Procedures A grain size analysis indicates the range of soil particle diameters included in a particular sample. Grain size analyses were performed on representative samples in general accordance with ASTM: D-422. The results of these tests are presented on the enclosed grain-size distribution graphs and were used in soil classifications shown on the exploration logs. 81135021 � � UNIFIED SOIL CLASSIFICATION SYSTEM Crrteria for Assi�ing Group Symbols and('xoup Narnes Using Labaatory Tests` Sal Classrt�ca6on Group Symbol Group Namee Coarse Gr�ned Sois Gravets C�ean Gravds Cu_4 and 1_Cc_3` G'T; 'ldell-gradeC gravel` More than 50�o reta�ned h7ore than 5Q%of coarse Less tRan 5%fines` C� 4 and!or 1 Cc 3` G? Poorty gratled graret` fracoon retained on an No 200 siere � 4� Gravels with Fnes More Fines dass�fij as M�or MH GM Sil^�gravei`O" than 12%fines Ftnes classfi as�L or CN GC Ga i yey Oravef=• Sands Clean Sands Cu_6 a�i_Gc-3` SW ��.'4'e1-graOeC sa�' `-0q6 or rrqre of coarse Less than 596 fines- Cu o and)or 1 -Cc 3` SP Foaty gradec sand frac�passes � y�ve Sands wi�Fu�es Fines dassrry as�.1L or MH SM Slwy santl'-^ More than t 2%fines- Fines Gassifyr as G�a GH SC Clayey sand°"' Fi�e-Grained Soils S�Its and GFa;s inorganic FI -7 and plots on or above"A"line CL Lean cla�f`" _��0�or more passes m�e �qud limit less chan�� FI 4 or pb:s tx�ow`A'I�ne� ML S�IY_" Na 20C siev2 Off�fVlc �1qUPd IlRlit-01+Qf1�REd �f3ftlC G2j/-'�" ���e, o� Lrqud 4rnd-not dned c�arnc s�ft'"' S Its a^d Clays i*n;�gas�c PI pbts on or�ove'�'line CN Fat ctay`" Liq,:ic Ilmi:�:r_r rwre PI plats below'A"line MH Efasoc Sil"'`" crgan� Lqu�1 ii^ut-ov�n dneC rxganic da;�-"'' �,�q �,f Liquid iimR-np:dneC Crganic s+tt" "� Hi�hly Ofga�iC SOi15 Ftim2nly(Xg211iC�"18�2f.��k in cobr.and organic odor PT Pe3�' "Based on the matenai passing the 3-in.(75-mmj sieve "If fines are organw.a�'Yr�th orgarnc fines'to group name ��f field sarriple contairied cobbles a boulders,or both.add"with cobi�les if soil coritains�15%gravel.add`wrth gravel'to grcxip name or boulders.or both`to g•oup narr�e -If Atterberg limits pbt in shaded area sai is a CL-ML,silty clay. 'Gravets wilh 5 to 12°�fines require duai syn�ois: GVi�-GM wel�-graded 'If soil contains 15 to 29°k plus No.200-add`with sand'ar`mth gravel with silt G1h'-GC vrell-graded gra�el with clay.GP-GM poorty 9��e�,-���ver is predonNnarit graded gra+el wrth sift,GP-GC poorly graded grave�with clay -ff�I contains�3d%plus No 2(Mi predommantly sand,add `Sands wrth 5 to 12°ro fines require dual symbols S1A'-SM well-graded •�x}y to group name. sarid�mth silt SW-SC well-graded sand with clay.SP-5M poorly graded u ff�I contains�30°!� lus No 20G_ edorrtina ravel.add sxid with silt SP-SC poorlY 9raded sand with clay P Pr �Y 9 `gravelly`Fo group�ame- `�u=D;�,/D,- Cc= ��) °PI_4 and plots on o�above-A-line _ D c x Deo '`PI-. 4 or plots belo'�'`q, i,ne `If sai coniains�15°io sand,add'wdh sand"ta group na��e 'PI plots on or�ove`A'I�ne. 'If fines dassify as C=ML use dual syrnbol GC-GM,or SC-SM. �PI pbts beiow'A"line. r,:i For classifxation of fineyrained solls a�d flne-prelned Tractio� � of coarse-gralned soils 5���,• +P�re � - 'qua'��'M'A -Inn ?� io�¢un:�at PI-4 t�LL-25 5 X qp then PI.O 7's 1L401 Q� . . pEquahor M•U'-Yr� �,� z ��er6ca�atLL=181oPi=Z G > 3p ther Pi.p 9 f11�81 . - � U � � O� , ,n � G\.�. a y MH c-OH i �'� �` t --� ML or OL 0 0 10 .^ 2�J 30 4p :r:i x %�_ _. '.3I; I;J:1 "IU LIQUID LIMIT(LL? 1��rracon '�� 81135021 , � , � GRAIN SIZE DISTRIBUTION ,asTnn�azz U S SIEVE OPENWG IN INCHES U S.SIEVE NUMBERS ITYDROMETER 6 4 3 2 1 5 � 3!4 1/23/8 3 4 6 $'I D �416 20 30 40 50 60 100140 200 100 , , 95 --- — ' I � i i � so — . . . � . 85 80 , 75 70 � � 65 � � i� ' 2 � � 60 � � 55 I � r a m M � ,1,1 m Z 50 �I � � � w Z 45 1, o w � � � 40 a zwW I I d , ' w 35 � I � 30 � 0 � 25 , � � 20 ' � � i : ; : n 0 15 c� Y 10 S I � 5 Y ' I 0 °° 100�� 10 1 � 0.1 � 0.01 0.001 � � � GRAIN SIZE IN MILLIMETERS � N COBBLE� GRAVEL SAND i Z ' I coarse fine coarse medium fine SILT OR CLAY I a � � � � Boring ID Depth' USCS Classification LL PL PI Cc Cu � - a • &1 7.5 2.45 13.67 w � a z � � 0 � 0 � � � Boring ID Depth D,� D� D,� D,o %Gravel %Sand %Silt %Clay < - Q • B-1 7.5 25 0.811 0.343 23.8 64.4 11.9 a -- - ------- w � � O � Q > H I � �_ -___. . _ _ Z i W � Q PROJECT: Renton Highlands Starbucks � PROJECT NUMBER: 81135021 � _ __ l��rr�con __ _ _ > SITE: NE 3rd and NE 4th Street CLIENT: SCM Solutions,LLC o Renton,WA I Ft.Collins,CO � - ---- -- --i 21905 64th Ave W. Suite 100 �- --- - - m Mountlake Terrace, Washington '�� EXHIBIT: B-1 . � , GRAIN SIZE DISTRIBUTION ASTM D422 U.S.SIEVE OPENING IN INCHES I U.S.SIEVE NUMBERS ITYDROMETER 6 4 3 Z 1.5 1 4 1/23/8 3 4 6 810 1416 20 30 40 50 sp 100140200 100 • 95 -- - - — � 90 -- —-- 85 I 80 . 75 1,1 70 65 F- I = I � ��u 60 � 5 � � r 55 a m L9 i� m W 50 Z I � li � � I i � F- 45 u' Z \ I I O W � � U a w W 40 \ U z a LL 35 a '� 30 � � m � �'� 0 � 25 ' � , I m , ' ''� : � o I ' � 20 � i m � j Ii 0 15 i J i I Z ,O � i � o ' � m � 5 m .� . � � �. �� , � � �OQ�I" �0 � �f� � �.�� I �.��� N � � GRAIN SIZE IN MILLIMETERS � � COBBLES GRAVEL SAND SILT OR CLAY ? coarse fine coarse medium fine a � c� � Boring ID Depth USCS Classification LL PL ' PI Cc Cu � a • &2 5.0 POORLY GRP�DED SAND with GRAVEL(SP) 0.38 16.91 w � a � � � , - 0 � 0 � LL � Boring ID Depth D,� D� � D� D,o %Gravel %Sand %Silt %Clay a - - . _ Q • B-2 5.0 19 4.496 0.678 0.266 39.0 56.7 4.3 a - -- w , � LL � J Q J f � -_-- _- . .__.._. Z I W � � a PROJECT: Renton Highlands Starbucks � PROJECT NUMBER: 81135021 N - - 1f�rr�con - W � > SITE: NE 3rd and NE 4th Street CLIENT: SCM Solutions,LLC o Renton,WA Ft.Collins,CO � - - - - 21905 64th Ave W. Suite 100 - - - m Mountlake Terrace Washington , EXHIBIT: �1 J I , • APPENDIX C SUPPLEMENTAL INFORMATION 81135021 I � � NE 4TH ST. - - -,- - - - -- ---— - _ - — - -- - - ---r� _ \.. I E.� PSPAd.�AS�MENT P�R� .. I �_--,---' ���C. h.,� R p .�,�Qz� -- �_H'- `� :� ORDER BOARD _�-; : ; _- :-_--_ _ - __ _ - - _ -- --'- �,,_��:; - S89'13'02"E 131.34 CLEARANCEBAEi �`"�*' ` -- — — ' — — — .,.,,} , — __.. �.�_.�_ __ _ :.� � . -_ ._ LS 1ADA _— �`[_�- ,�� ��-�� �,, �_ ACCESS I S 1�:�'` '`�'� _ i �.�_ � �, ✓'� 5 ' t� il � �- "-' LS � � � � � 9.0� � � �C - I�S _.� I,650 SF � � _ ,�J 0 s.z� _- ss.r a o� 20.o�-�k—za.o�---�I�zo.o� o � �, ' � �� o �, . PATIO "' �`//' �,° � � BIKE -� LS _ ,,I�'� �. RACKS Q J'� �o' -�/ ,� _ LS v �, � - is.o� f �� u.ss �" TRASH I iz.o� O 8.5 2a.o� � , �r-> L5 i � 16.0' y ` - - - - - � � 20. .� � ' �� � 9.0' �� � �y '�� 0 5.D' ,sot6'a;;' I O Q � �/qJ� � ' :^� o ` 24,�0' �,��u.z6 z � j i ` / DIRECTIONAL � ��1' �� SIGNAGE � j ' � �� /"� � .�' �� /` I EXISTING F1RE HYDRANT n / �o'�o, ^��o� ,- y� 'y� �.J'� �'�' ,'.,, � �, '��`°` Q,Q I y� � �` � .���°` , ' , , ��� �°`� ��. , I �� ,: �� ; , / ;' � � ' ��' ; i / ��_� �F � 'I� �s�E�.; � � . --_ � , � ,':� . , ; , CONSTRUCTION TYPE:V-B � ' ' ' OCCUPANCY:A-3 � STARBUCKS-CONCEPT PLAN PARKING REQUIRED-22 RENTON,WA PARKING PROVIDED-22 GONCEPT SITE PLAN � Sterling Design Associates, Ilc SCALE I"=30' 'PROPERTY AND REGULATORY NORTH DATE 02/07/13 INFORMATION HAS NOT BEEN VERIFIED � � � Excerpt from 1994 USGS map titled "Renton, WA" (contour interval = 25 feet) �, , i (� � 1 'y ��i ' � ' +L+.� + • � ' ,� :'CD , 5 r �`ft '� 'V . _� �L_�a�� .�L ��'�.,�` i � ��t'} ,'�1 ,' t�lE dTi�l � � �a� •'.`• �r�,._ ; ,� ' �i { � � � 4 !�. 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'� '^�!� i� �.:� �� 1� ; � 1� �'f ,',5��'� - �:'r r''� ti`i i ' �'' -f�� '� � (�' ��� = _ ,�,,rjl � - ,�,;,f� �� ,'� ; ,, �F 'I ( .i � ��� •�Y� E r t +.,�: �;CI�KmgCounty .�r� __- r�� r 0 445ftC.. � ! : i ��., i The infamation incfuded on,this map�has been compled by King Counry staR from a variery ot sources and is subject to change without nolice.King County makes no representations w warranties,express or im�lied,as to accuracy,completeness,timeliness,or rghts to the use of such infom�ation. This dxumen[is no[intended tor use as a survey producl Kmg County sha�l not be liable fw any general,special,mdirect.inadental,or consequenual a � damages induding,but no[limited to.lost revenues or los[protits resulhng hom the use o�misuse oi the mfonnation contained on th�s map.Any sale of K�ng County this map a information on this map is prohibiled except by written pertnission of King County. Date:��9;20�3 Source�King Coun[y iMAP-Sensi6ve Areas(http:i/www.metrokc.govlGlSliMAP) t � � Excerpt from 2013 King County iMAP Le ge nd �_� County Boundary Streets 5A0 Erasion � Mountain P�aks ��+peway CAO Basin Condition Contours (5ft dark f �r�� � ��,�„ ,i{f IOD:500:100D Lawl � A1 a1�u m. r � , o�nor Parcels � �ox, CAO Shoreline Condition Lakes and l.arge Rivers � ���h Streams Modrum 5Aa Wetland �� � 5A0 LandslidQ Highways r=-�. 5A0 Coal Mine ��, �f Incorporated Area ::.\ SAO 5eismic The information included on this map has been compled by Ring County staft!rom a vanety of sources and is subject lo change wi[houl noUce.King County makes no representa6ons or warranties,express or�mplied,as to accuracy,completeness.Gmeliness,or nghts to the use of such information. This document�s not intended for use as a survey product.K�ng County shall not be hable fa any general,speciai,indirect.incidentai,or consequential a � damages indudmg.but not limded to.lost revenues or lost profRs resulhng From the use w misuse of the infonnation contamed on this map.Any sa�e of King County tt�is map or infama8on on this map is prohibrted excep[by wnrien permission of Kmg Counry. Date:479f2013 Source:King Couniy iMAP-Sensi6ve Areas(http:t.'www.metrokc.gov/GIS(iMAP� � • ,?908 �lortheast 4th Street - Goo`�le Maps Page 1 of 1 Address 2908 Northeast 4th Street ��. ��i�' ��„� ���� ,,����.x�,,�,�� � -�, ,f x � ,j i `\,�F� ,� ��� �� . ; � �,�* � ` � t-`,_ �_. �F. �/��.i.' ��G�'.L. Y.► .4 , ,� , �s��. 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