The URL can be used to link to this page

Home My WebLink AboutSoils Report Com 2011-00006 - GRD Engineering / Geo-Tech Reports - 3/22/2010 r T O BE KEPT l PARCEL N THE F/�E .3 Soils Report For South Shore Enterprises Vehicle Storage Building 750 E Dalby Road a 3 Lot 3 of Parcel 32232 43 00019 Union, Mason County, Washington March 22, 2010 Project#1027 Prepared For: South Shore Enterprises, LLC PO Box 249 Union, Washington 98592 AFL CLYpE sT WAsy� 9J Prepared By: Envirotech Engineering 3/12110 74 NE Hurd Road 43oa5 �� Belfair, Washington 98528 01'sFG`ST£��c,�� Phone: 360-275-9374 oNAL�N Fax: 360-275-4789 � 7 TABLE OF CONTENTS 1.0 Introduction.....................................................................................................................................2 2.0 Project Information.........................................................................................................................2 3.0 Surface Conditions...........................................................................................................................2 4.0 Subsurface Investigation..................................................................................................................3 dtmation Rates..........................................................................................................................3 4.1 Inf 4.2 Groundwater................................................................................................................................ 3 5.0 Engineering Conclusions.................................................................................................................3 6.0 Closure.............................................................................................................................................4 Appendix A-Site Plan Appendix B-Soil Information (Soil Logs;Well Reports) 4 ,e 1.0 Introduction Envirotech Engineering (Envirotech) has completed a soils report in conjunction with the stormwater management plan for the South Shore Enterprises, LLC Buildings. The proposed industrial development is located at 750 E Dalby Road (Lot 3 of Parcel 32232 43 00010) in Union, Mason County,Washington(Project). See the Vicinity Map below for a general indication of the Project location. O E 2NDM !4TN ET E STN ST EDR` WOMO�u- TSV! _E MASdI AV DAL"- - i F of • 3 E HnAND DR I Project --- !NANZAW&�. TACDYA POWER ACCESS RE) _ T21 NRIW Q. FOR r1 Vicinity Map from Mason County Website 2.0 Project Information Information pertaining to the Project was provided by Rick Buechel with South Shore Enterprises, LLC. The property is currently developed land with an existing 5000 sf building, 7000 sf concrete slab that was utilized for a pre-existing warehouse, a driveway, parking areas, on-site septic system and an off-site water well. The property has been recently divided from a large lot to a parcel of approximately 5.78 acres in size. Existing land use near the Project includes a mixture of commercial and residential development. The proposed development includes constructing a 7000 square feet metal building within the existing concrete slab area, improve the parking and driveways, and improve the site drainage. The existing building is planned to be utilized as office space for four employees. The proposed metal building is planned to be used for vehicle and equipment parking/ storage. See the accompanying stormwater management plans for an illustration of current and proposed site features. 3.0 Surface Conditions Information pertaining to the existing surface conditions for the Project was gathered on March 18, 2010 by Michael Staten, geotechnical engineer with Envirotech. During the site visit, site features were documented that may influence the Project. Past timber harvesting and vegetation clearing is apparent for this Project. Most of the property is Envirotech Engineering South Shore Enterprises Soils Report Ph. 360-275-9374 Page 2 of 4 750 E Dalby Road Fax: 360-275-4789 Union,Washington March 22,2010 covered primarily with scotch broom. Native vegetation on nearby properties includes firs, blackberry,and other trees and shrubs common to this area. The area of development has mild grades with steps in the terrain of up to 3.5 feet. Ascending grades are located to the northwest of the development with slopes ranging from less than 10%to just over 40%. Descending slopes are generally to the east, with maximum grades of approximately 20%. 4.0 Subsurface Investigation Information on subsurface conditions pertaining to the Project was gathered on March 18, 2010 by Michael Staten, gcotechnical engineer with Envirotcch. Information on subsurface conditions for the Project was accomplished by observing two test pit excavation to a depth of up to 3 feet below the existing ground surface.Additional information on subsurface conditions was collected by reviewing well logs originating from nearby properties, and reviewing published maps for the vicinity of the Project. Appendix B has pertinent information on subsurface conditions for the Project, including test pit logs. Specifically, soils for this project were described utilizing the Unified Soil Classification System (USCS)and the U.S. Department of Agriculture(USDA)Textural Classification System. Soils within the upper 3 feet of natural ground were observed to be moist, brown, loose to medium dense silty sand with gravel(SM). Expanded and specific subsurface descriptions, other than what is provided in this section, are presented in the soil logs located in Appendix B of this report. According to the USDA Textural Classification System, the upper 36 inches of soil were classified as sandy loam. Per the SCS classification, the site soils where drainage features will exist were classified as Alderwood Gravelly Sandy Loam,Ab. 4.1 Infiltration Rates According to the Stormwater Management Manual for Western Washington prepared by the Washington State Department of Ecology Water Quality Program, infiltration rates of the soils encountered at a depth of at least 42 inches below the ground surface is 4.14 inches/hour. This infiltration rate includes a factor of safety of 2,as recommended by the stormwater manual. Percolation tests were not completed for this Project. 4.2 Groundwater Per our site visit, groundwater was encountered at a depth of 3 feet below the existing ground surface near anticipated stormwater outlet locations. Shallower groundwater, as little as 12 inches below the ground surface, was observed directly downslope from anticipated facilities. 5.0 Engineering Conclusions The following sections present engineering assessments and conclusions concerning the proposed Envirotech Engineering South Shore Enterprises Soils Report Ph. 360-275-9374 Page 3 of 4 750 E Dalby Road Fax: 360-275-4789 Union,Washington March 22,2010 J development of the Project. These conclusions have been made available based on the planned improvements as outlined in the Introduction Section of this report; general observations of drainage and topography as summarized in the Surface Conditions Section; and, soil conditions that were identified by the field investigation and soils testing as outlined in the Subsurface Investigation Section. Conclusions for the Project that is provided herein, includes pertinent information for landslide and erosion hazards. It is apparent that the proposed redevelopment is within 300 feet of a landslide hazard area or its associated buffer or setback as defined in the Mason County Resource Ordinance. It is reported that a past geotechnical report has been prepared to address this slope. Based on the soil classification of the Project soils, the near surface soils have a moderate erodibility factor. Temporary erosion control measures may be minimal for this Project. This is due to the small nature of this project, relatively minor grades within the planned disturbed areas, and observed soil characteristics. Temporary erosion should include standard controls such as a stabilized construction entrance and temporary sedimentation ponds. Permanent erosion control should be employed for all applicable site features such as culvert inlets and outlets, surface areas for traffic, and denuded areas. Additional erosion control measures may need to be employed during and/ or after construction if selected erosion control measures are not performing as expected, or required by the project engineer,County or other prevailing agency. Erosion control information and specifications may be found in the "2005 Stormwater Management Manual for Western Washington,"prepared by the Washington State Department of Ecology Water Quality Program. 6.0 Closure Due to the inherent natural variations of the soil stratification and the nature of geotechnical subsurface explorations, there is always a possibility that soil conditions encountered during construction are different than those described in this report. Therefore, it is recommended that a qualified engineer observes and documents the construction, or Envirotech is promptly notified if project and subsurface conditions found on-site are not as presented in this report so that we can re-evaluate our recommendations. This report presents a geological/geotechnical assessment, and is intended only for the owner, or owners' representative. Furthermore, this report is only valid for the project information and location described herein. Please contact Michael Staten at 360-275-9374 if you have any questions, comments, or require additional information. Sincerely, Envirotegh Engineering Michael Staten, P.E. Geotechnical Engineer Envirotech Engineering South Shore Enterprises Soils Report Ph 360-275-9374 Page 4 of 4 750 E Dalby Road Fax: 360-275-4789 Union,Washington March 22,2010 APPENDIX A SITE PLAN N SCALEi 1 INCH 100 FEET 0 251,933 SF 5.78 GUARRY SPALL OUTLET PROTECTION NITS(IF 12,DIA. ISTING CPEP PIPE CONCRETE PAD OTPI q T STING CB PROPOSED W/ BUILD ILry AT ING R FP.B 6' SEPARATOOR ABOVE GRADE 14% A, 0 FT H }� •TP2 W + I EXISTING � BUILD[NG Q EXISTING DRIVEWAY. LEGEND so EXISTING CONTOUR EADNG TP1e TEST PIT EXISTING PAVED TURNAROUND PARKING EXISTING CHAIN LINK FENCE(APPROXIMATE) �/ EXISTING BRIDGE PM( PA IVEO INGRESS/ � SIRE EGRESS PROJECT/ OWNER/ LOCATION SOUTH SHORE ENTERPRISES S❑ILS REPORT SOUTH SHORE ENTERPRISES PARCEL 32232 43 00010, LOT 3 DALBY ROAD MASON COUNTY, WASHINGTON ENGINEER, ENVIROTECH ENGINEERING 74 NE HURD ROAD BELFAIR, WASHINGTON 98528 360-275-9374 SITE PLAN APPENDIX B SOIL INFORMATION TEST PIT LOG TEST PIT NUMBER TP-1 PROJECT: South Shore Soils Report DATE OF LOG: 3/18/2010 PROJECT NO: 1027 LOGGED BY: MCS CLIENT: South Shore Enterprises EXCAVATOR: N/A LOCATION: Parcel 32232 43 00010, Lot 3 DRILL RIG: None Mason County, Washington ELEVATION: N/A INITIAL DEPTH OF WATER: 12" FINAL DEPTH OF WATER: 12" STANDARD PENETRATION TEST SOIL STRATA, DEPTH SAMPLERS USCS DESCRIPTION LL PI DEPTH N CURVE AND TEST DATA 10 30 50 0 . ....... ......................................... . SM Brown, moist,wet at 1 ft, loose SILTY SAND with GRAVEL. Gravel is primarily fine and subangular. Sand is mostly 1 medium. Low plasticity. 2 3 Excavation terminated at approximately 3.0 feet 4 5 6 7 8 9 10 Groundwater Encountered ENVIROTECH ENGINEERING This inrorrnation pertains only to this boring and should not be Geotechnical Engineering interpreted as being indicitive of the entire site. r TEST PIT LOG TEST PIT NUMBER TP-2 PROJECT: South Shore Soils Report DATE OF LOG: 3/18/2010 PROJECT NO: 1027 LOGGED BY: MCS CLIENT: South Shore Enterprises EXCAVATOR: N/A LOCATION: Parcel 32232 43 00010, Lot 3 DRILL RIG: None Mason County, Washington ELEVATION: N/A INITIAL DEPTH OF WATER: 36" FINAL DEPTH OF WATER: 36" STANDARD PENETRATION TEST SOIL STRATA, DEPTH SAMPLERS USCS DESCRIPTION LL PI CURVE AND TEST DATA DEPTH N 10 30 50 0 . .. ... ....... ........... . . .................... ... ... SM Brown, moist, loose SILTY SAND with GRAVEL. Gravel is primarily fine and subangular. Sand is mostly medium. Low 1 plasticity. Medium dense 2 Wet 3 Excavation terminated at approximately 3.0 feet 4 5 6 7 8 9 110 Groundwater Encountered ENVIROTECH ENGINEERING This information pertains only to this boring and should not be Geotechnical Engineering interpreted as being indicitive of the entire site.