GEOTECHNICAL // GEOLOGIC // HYDROGEOLOGIC // ENVIRONMENTAL
© 2020 ICICLE CREEK ENGINEERS, INC. // 29335 NE 20TH STREET, CARNATION, WASHINGTON 98014 // (425) 333-0093
HOWARD A. HANSON DAM
Location: King County, WA | Owner: US Army Corps of Engineers
ICE provided up to three licensed Geologists to monitor drilling (sonic and percussion drill sampling) of exploratory drill holes for the installation of vertical and horizontal drains in the right abutment of the US Army Corps of Engineers Howard A. Hanson Dam on the Green River in east King County. The purpose of the drilling was to install permanent dewatering wells designed to lower the short- and long-term groundwater levels within the right abutment during high pool conditions. ICE’s Geologists prepared a detailed boring log for each drain location using USACE standards and protocol. Our Geologists evaluated soil and bedrock characteristics and a means to understand the geologic history of the right abutment materials (pre-historic landslide deposits). Soil samples were obtained by our Geologists for grain size analysis testing. ICE also provided a licensed Geotechnical Engineer and Hydrogeologist for designing the drains.
This design involved evaluation of the grain size laboratory results, review of field (boring) log results and geologic interpretation of site conditions for developing the appropriate well screen and filter pack.
BELLEVUE BOTANICAL GARDEN PEDESTRIAN BRIDGES
Location: Bellevue, WA | Owner: City of Bellevue
ICE provided geotechnical engineering services for two proposed pedestrian bridges at remote sites within the Bellevue Botanical Garden. The project included design of two timber bridges, including a 140-foot span suspension bridge and a 70-foot span truss bridge, as well as construction of the suspension bridge. In order to evaluate subsurface conditions at the bridge abutment/anchor sites, ICE subcontracted with Geologic Drill Explorations to operate “robot” mini-track drill equipment that was able to use existing trails for the approach, then successfully maneuvered in difficult terrain to access the drill sites. ICE evaluated the stability of steep slopes in the vicinity of the bridge abutments and provided recommendations for maintaining slope stability. ICE also provided recommendations for earthwork including stripping and excavation of unsuitable soils, fill compaction and subgrade preparation requirements, and suitability of on-site soils for use in structural fills including an evaluation of the effects of weather and/or construction equipment on the workability of site soils, and recommendations for foundation and ground anchor design, including passive pressures and drainage considerations.
EAST LAKE SAMMAMISH TRAIL MASTER PLAN, NORTH SAMMAMISH, SOUTH SAMMAMISH, AND ISSAQUAH SEGMENTS
Location: Sammamish and Issaquah, WA | Owner: King County
ICE has provided geotechnical engineering services for design and construction of three segments of King County’s East Lake Sammamish Trail Master Plan project since 2012. The trail is being widened to 16 feet (12-foot paved surface and 2-foot shoulders). While the existing trail right-of-way is relatively wide (50 to 100 feet), wetland areas and steep slopes (including the road embankment for East Lake Sammamish Parkway in local areas), along with other local modifications (landscape walls, driveways, etc.) within the right-of-way by adjacent property owners, limit the space needed to accomplish the trail widening. The trail follows a former rail line that is between and parallels East Lake Sammamish Parkway SE and the Lake Sammamish waterfront.
PROPOSED HARVEST UNIT EVALUATIONS
Location: Various Locations | Owner: Hancock Forest Management
ICE has evaluated over 100 proposed harvest units (PHUs) for Hancock Forest Management (HFM) in support of Forest Practices Applications (FPAs). These evaluations, including geologic, hydrogeologic and geotechnical services, have been completed within the Snoqualmie, White River and Cathlamet area Tree Farms in King, Snohomish, Pierce, Lewis and Wahkiakum Counties. ICE has completed watershed analysis for mass wasting and surface erosion assessment and Prescriptions for PHUs within the Tolt, Griffin and Tokul Watershed Administrative Units. We have evaluated potentially unstable slopes and landforms within the Tree Farms consistent with Forest Practice Rules.
ICE has also assisted HFM in road design, bridge/culvert crossing design and road decommissioning design.
Location: Near Roslyn, WA | Owner: New Suncadia LLC
The Suncadia Resort project involved the construction of over 4,000 homes and 55 miles of new roads. ICE’s initial involvement on the project in 1997 was during preparation of the Environmental Impact Statement (EIS); as part of the EIS we detailed the coal mine hazards at the project site. ICE has provided geotechnical engineering services to Suncadia for design and construction of various phases of the project since 2004. Some of the project elements include a fire station, recycling center, pump stations, administration building, turf care facilities for golf courses, parking lots, community activity center, a large-diameter arch culvert, road alignment engineering and gravel pit reclamation.
ICE has had up to four staff geologists and engineers on-site during the construction seasons between 2004 and the present providing construction observation services and compaction testing of soils for utility backfill, road subgrade preparation, monitoring of mass grading associated with the Bullfrog Pit restoration project and infiltration testing. In addition, we also provided environmental assessment and remediation related to petroleum-contaminated soil at several locations within the Suncadia project site.
SNOQUALMIE FALLS HYDROELECTRIC REDEVELOPMENT
Location: Snoqualmie, WA | Owner: Puget Sound Energy
ICE provided geotechnical and geological engineering services related to the Snoqualmie Falls Hydroelectric Redevelopment project. ICE observed the work-in-progress related to rock trenching for the installation of cofferdam walls at Plants 1 and 2. The installation of the cofferdams required that the steel sheet piles and King Piles be embedded at least 10 feet into competent bedrock. ICE monitored the blasting (loosening) and excavation (removal) of the broken rock, then evaluated the rock strength using Washington State Department of Transportation (WSDOT – 2005 Geotechnical Design Manual) methods. The walls of the excavations were mapped for fracture density and character, rock type and degree of weathering.
ICE worked closely with the prime contractor, designer and PSE during the rock excavation and pile installation process.
KITTITAS COUNTY HEAD START REDEVELOPMENT
Location: Ellensburg, WA | Owner: Kittitas County Head Start
ICE provided geotechnical engineering services for the redevelopment of Kittitas County Head Start in Ellensburg. The
property redevelopment included the addition of about 10,200
square feet of building space, paved access and parking. The purpose of our services was to explore subsurface soil and groundwater conditions at the project site as a basis for developing geotechnical recommendations for site redevelopment. Nine test pits were dug to depths ranging from 6 to 9 feet. The test pit explorations were continuously observed by a geologist from ICE who classified the soils, observed groundwater conditions, and prepared a detailed log of each test pit.
A geotechnical design report was prepared with a summary of our observations and conclusions and recommendations for site preparation, earthwork and foundation design, pavement design and site drainage. ICE also provided on-call geotechnical services during construction.
ESTATES AT GOLD HILL
Location: Near Crystal Mountain, WA
The proposed Estates at Gold Hill property includes 8 residential lots to be constructed on a steep (over 100 percent grade in some areas) hillside overlooking the Crystal Mountain ski resort in Pierce County. ICE completed detail geologic reconnaissance, some by ropes for safety in the steeper areas, and a subsurface exploration program consisting of test pits and test holes. We characterized the site conditions for areas underlain by Colluvium, Talus, Shallow Bedrock and Surface Bedrock. We evaluated steep slope areas where a community drainfield and utility easement are planned.
We expect homes will be constructed by using a foundation system that requires minimal ground disturbance (such as piers or shafts) that extend to and are socketed into bedrock for lateral stability.
Location: Issaquah, WA | Owner: Port Blakely Communities
ICE provided geologic and geotechnical engineering services associated with developing land with high density residential housing and roads at Issaquah Highlands, an area underlain by abandoned underground coal mines. As part of ICE’s services, we drilled test borings into the underground mines to evaluate historic mine map accuracy and the character of the overlying bedrock and unconsolidated soil deposits. ICE also provided design geotechnical services for the construction of four large detention ponds (all of which required Washington Department of Ecology Office of Dam Safety review), underground pipelines in steep hillside areas, evaluation of ancient landslide features, fill options for park sites and hydrogeologic evaluation of a large stormwater infiltration system. In addition to design services, between 2002 and 2010, ICE provided geotechnical services during construction of roads, utilities, ponds and other elements of site infrastructure.
This project required geotechnical engineering analysis consistent with WSDOT Standard Specifications and City of Issaquah and King County Road Standards.
PRELIMINARY COAL MINE HAZARD ASSESSMENTS
Location: King County, WA | Owner: Various Owners
ICE has completed more than 200 preliminary coal mine hazard assessments on properties within King County. These properties area indicated in local and county land use codes as “coal mine hazard areas.” These preliminary coal mine hazard assessments include a detailed review of current topography and historic coal mine maps, surface reconnaissance, interviews with local people knowledgeable of the abandoned mines, mine mapping including the development of geologic cross-sections and analysis of regional ground subsidence (sinkholes, vertical subsidence, ground strain and ground tilt). ICE has developed a computer application for this analysis of regional ground subsidence.
The analysis of coal mine hazards is developed by ICE by participation on a technical team of local professional engineers, geologists, mining engineers and public agency representatives. ICE has been active since the late 1980’s in the development of technical information related to the understanding and assessment methods of coal mine hazards in Washington.
PHASE II ENVIRONMENTAL SITE ASSESSMENT
Location: Bothell, WA | Owner: Northshore School District
ICE completed a modified Phase II Environmental Site Assessment (ESA) on a 45-acre rural residential property that the Northshore School District was considering for purchase. The property included two houses, a barn and numerous outbuildings. Based on our discussions with the client and preliminary information from the Phase I ESA, we developed a scope to address the four aboveground storage tanks (ASTs – gasoline, diesel and heating oil) and one underground storage tank (UST – heating oil) at the site, along with several other areas where petroleum products were stored or used. We completed 21 soil borings and seven test holes, obtaining soil samples for field screening by visual, water sheen and headspace vapor detection methods. Groundwater was not encountered in our borings or test holes. Based on the field screening results, soil samples were submitted for chemical analysis of petroleum-related compounds. We identified several areas of concern and recommended additional sampling and testing, particularly in the area of the heating oil UST where evidence of contamination was encountered. The UST and associated contaminated soil will likely be removed and additional assessment will be completed following the pending property purchase.
SOUTH SERVICE CENTER SPOKANE STREET EXIT MODIFICATIONS
Location: Seattle, WA | Owner: Seattle City Light
ICE provided geotechnical engineering services for the South Service Center Spokane Street Exit Modifications project for Seattle City Light. This project included multiple improvements, including installing a 113-foot high tapered-steel transmission pole, repositioning and expanding a service dock, removing and replacing the salvage office building and adding dock capacity for salvage operations, and rebuilding existing asphalt to better support heavy vehicle traffic. The South Service Center is underlain by compressible and liquefiable soils. Our evaluation of the site included drilling three test borings to 60 feet, laboratory testing of soils, deep foundation piles analysis (axial and lateral loads), and pavement section recommendations for light and heavy wheel loads. Our analysis included use of computer applications LIQUEFYPRO, SETCON, PILECAP and LPILE.
ICE provided geotechnical consultation and construction observation services for the transmission pole. ICE also provided environmental services for this project, including 33 soil probes for the purpose of obtaining soil and groundwater samples.
SEATTLE CITY LIGHT APPRENTICESHIP TRAINING CENTER
Location: Seattle, WA | Owner: Seattle City Light
ICE provided geotechnical engineering services for Seattle City Light’s Apprenticeship Training Center to be located at 10000 West Marginal Way South, immediately south of the Duwamish Substation. The Training Center is to be constructed on vacant land that contains wetlands and a history surface modification as a result of dredging and straightening of the Duwamish River. The development plan consists of a 9,330 square foot (8,930 square foot footprint) Training Center building, a 25- by 40-foot Equipment Storage Warehouse, a Backup Generator Building, underground vaults, poles and transmission tower standards, and other possible structures related to substation systems, commercial service, residential service and crane training.
TWIN RIVERS QUARRY LANDSLIDE EVALUATION, MITIGATION AND MINE RECLAMATION
Location: Clallam County, WA | Owner: Lafarge North America
A large landslide occurred within an inactive clay mine referred to as the Twin Rivers Quarry, about 23 miles west of Port Angeles. The landslide extended to the beachfront of the Strait of Juan de Fuca. As a result of the landslide, the Washington State Department of Natural Resources issued an Agreed Emergency Order requiring that Lafarge monitor for additional ground movement, evaluate immediate repairs as necessary and develop a plan to repair the landslide.
ICE completed a preliminary evaluation of the landslide and setup surface ground control survey monitoring stations and photo stations within and adjacent to the landslide mass; these survey stations were monitored. ICE completed a subsurface exploration and ground movement (instrumentation) monitoring program, including the installation of inclinometers and piezometers; these inclinometers were monitored for movement. ICE completed a detailed evaluation of the landslide cause/mechanism and provided recommendations for mitigation. ICE concurrently developed a final reclamation plan for the Twin Rivers Quarry.
Location: Snohomish, WA | Owner: City of Snohomish
ICE provided geotechnical engineering and environmental services for the planned traffic signalization and intersection improvements at 2nd Street and Lincoln Avenue in Snohomish. The project was for a new traffic signal with integral lighting, new sidewalks and a trail crossing at the subject intersection. We explored subsurface soil and groundwater conditions by drilling a test boring to a depth of 21 feet. Foundation design for the project was completed in accordance with the 2010 WSDOT Geotechnical Design Manual, 2011 WSDOT Design Manual and the 2010 WSDOT Standards for Road, Bridge and Municipal Construction. Infiltration design was based on the 2005 Washington State Department of Ecology Stormwater Management Manual for Western Washington. ICE provided recommendations for foundation support, structural fill and construction techniques appropriate for the subsurface conditions, including methods for dealing with groundwater encountered during construction, and preliminary recommendations for infiltration rates (short- and long-term). We also completed a review of environmental records regarding existing site conditions and are in the process of completing a hazardous materials review as required by WSDOT.
MONROE CORRECTIONAL COMPLEX, SEWER AND STORMWATER IMPROVEMENTS
Location: Monroe, WA | Owner: Washington State DOC
ICE provided geotechnical engineering services for proposed sewer and stormwater system improvements at the Washington State Department of Corrections’ Monroe Correctional Complex in Monroe.
ICE developed recommendations for dewatering and shoring requirements; excavation and trench side slopes; backfill materials; placement and compaction of bedding and backfill materials; design values for foundation support, uplift, friction, lateral soil pressures and estimated post-construction settlement performance of manhole structures; support of the utility lines (including criteria for overexcavation); roadway subgrade preparation; foundation support (including allowable bearing values and settlement estimates for spread footings); support of on-grade floor slabs; lateral soil pressures acting on pump station walls; and lateral resistance (including passive earth pressures and coefficient of friction against sliding).
M STREET TO LAKEWOOD TRACK AND SIGNAL IMPROVEMENTS
Location: Lakewood, WA | Owner: Sound Transit
The M Street to Lakewood Track and Signal project upgrades seven miles of existing track and street crossings in the Lakeview Subdivision rail corridor from South M Street in Tacoma to Bridgeport Way SW in Lakewood.
ICE was on the AECOM Construction Management team for Sound Transit to provide geotechnical services during construction regarding the earthwork aspects of this project. As part of this contract, ICE completed 38 test borings along a previously installed underground utility trench that runs the full length of the alignment, including backfilled bore pits and major road crossings, to evaluate the level of compaction that was achieved by a previous contractor, and observed repair efforts.
FACTORIA SERVICE CENTER, WAREHOUSE ADDITION AND PARKING IMPROVEMENTS
Location: Bellevue, WA | Owner: Puget Sound Energy
ICE provided geotechnical engineering services for an addition to an existing warehouse. The building is a two-story structure constructed with concrete masonry units and a steel-frame structure.
ICE’s services included a geologic reconnaissance of the project site and adjacent area, along with exploration of the subsurface soil and groundwater conditions in the area of the proposed building addition, and parking improvements by completing five test borings. The borings were drilled within the proposed building addition/parking area footprint using a truck-mounted drill rig subcontracted to ICE. The truckmounted drill rig was selected because it causes far less damage to existing paved areas than a backhoe. ICE provided recommendations for earthwork, foundation design, support of slab-on-grade floors, surface and subsurface drainage systems, and the design of pavement sections for access and parking areas. ICE provided design plan review and construction observation services.
KING COUNTY CHILDREN & FAMILY JUSTICE CENTER REDEVELOPMENT
Location: Seattle, WA | Owner: King County
ICE provided geotechnical engineering services related to the redevelopment of the King County Children and Family Justice Center in Seattle. The site currently includes the Alder Tower, the Alder Wing and the Spruce Youth Detention Facility. These buildings will be demolished and replaced with a new Courthouse, Juvenile Detention Facility and a Parking Garage.
ICE completed a subsurface exploration program that included nine test borings. Based on the results of our data review and subsurface exploration program, we developed seismic design criteria and assessed Environmentally Critical Areas. Our geotechnical engineering report presented recommendations for site preparation and earthwork, options for wall support of deep excavations, shallow foundation support and basement subgrade walls, dewatering and shoring requirements, excavation and trench side slopes for underground utilities, pavement subgrade design and pavement sections, soil infiltration rates for short- and long-term infiltration, surface water drainage and erosion control measures.
DEAD HORSE PROPOSED HARVEST UNIT FOREST ROAD FAILURE EVALUATION
Location: Clallam County, WA | Owner: Merrill & Ring
ICE completed an evaluation of a forest road failure located within the Dead Horse Proposed Harvest Unit (PHU). The forest road failure occurred within Section 17, Township 30 North, Range 9 West, Willamette Meridian, near Lake Crescent in the Boundary Creek Watershed in Clallam County, Washington. The Dead Horse PHU was being harvested under an approved Forest Practices Application, although general operations of the approved FPA were limited because of a forest road failure and the in-progress development of a plan to mitigate the forest road failure area.
The forest road failure occurred along a new forest road that parallels the RMZ (Riparian Management Zone) of Boundary Creek (Type F water – fish habitat). Boundary Creek flows to the Lyre River, a Shoreline of the State that eventually flows into Lake Crescent.