O’FALLON, ILL The parking lots for the Township Administration Building and Maintenance Facility were in poor condition. The scope of the project included Topographic Survey, Pavement Assessment, Pavement Design, Stormwater Design, reconfiguration of entrances to and from the facilities, ADA improvements, and general site/civil reconfiguration of existing facilities. More specifically, as part of the improvements to the site, Gonzalez proposed extending the pavement limits to the edge of pavement of a potential future connection near the salt storage dome. The entrance of the potential future connection was determined from modeling turning movements of a tractor trailer entering and exiting the site. The new garage building is a metal building approximately 42’ x 100’ with a steel frame and concrete floor. It is a pre-engineered building, it has a new panelboard fed from the existing electrical panel within the existing building on the township site. The building has underground power feed to it and fuel canopy lighting from the existing building panelboard. The new garage building includes a floor drainage system with floor drains, one per bay, connected to an oil interceptor. From topographic data gathered from the garage and maintenance yard, stormwater was directed to an enlarged detention basin on the site. Other Site/Civil improvements consisted of new storage bins, sanitary sewer improvements, new fencing, and new lighting.
IDOT I-270 WIDENING AND BRIDGE REPLACEMENT PTB 184-23
ST. LOUIS, MO The most northern connection between St. Louis, Missouri and Madison County, Illinois is I-270. This portion of the interstate, from IL 157 to the Missouri state line, is largely a four-lane highway which travels over several railroads, has interchanges with several state routes and is adjacent to urban development, distribution and logistics parks, residential subdivisions, and farm land. This portion of I-270 carries traffic through or near St. Louis, Missouri; and Granite City, Mitchell, Pontoon Beach, and Glen Carbon, IL.
As a direct route to and from St. Louis County into Illinois, I-270 is a common corridor for many motorists who work, live, and/or go to school on opposite sides of the Mississippi River. With population density increasing in St. Louis County and nationwide freight movement expanding through the area, the four-lane highway has seen significant increases in traffic volume and the number of crashes. Current Average Annual Daily Traffic on I-270 is nearly 57,000 vehicles.
Gonzalez is part of multi-disciplinary team tasked conducting preliminary engineering study investigating how to address traffic growth, decrease congestion, and improve safety along the route. Gonzalez was hired as the lead geotechnical engineer of the project. Geotechnical services included development of field investigation for collection of subsurface data from over 70 geotechnical borings and development of geotechnical recommendations for roadway, interchange improvements, and Illinois Route 3 bridge replacement. Gonzalez also performed field inspections, oversaw drilling and laboratory operations, and logged collected samples.
WASHINGTON TERRACE #14 SEWER REPAIR
ST. LOUIS, MO Metropolitan St Louis Sewer District (MSD) constructed approximately 100 lineal feet of 15” diameter combined sewer pipe and appurtenances. The project area is location in the alley near residential property 14 Washington Terrace St. Louis, MO 63012.
Since the project was located in a narrow residential alley with overhead and underground utilities, a third party utility location service provider was used for identifying “safe” location to drill. Gonzalez completed field investigation with a CME-55LC low overhead drill rig using conventional hollow stem auger drilling methods. One 25-foot test boring was drilled to collect data and samples for defining the subsurface profile and development of design parameters. We conducted laboratory tests to determine pertinent engineering and index properties of foundation soils. Tests performed included moisture content, Atterberg limits, and unconsolidated-undrained triaxial compression.
Our engineering analyses focused on observed subsurface conditions, excavation considerations, anticipated subsurface dewatering requirements, lateral earth pressures, and construction concerns. Gonzalez Provided: • Geotechnical Drilling and Laboratory Testing • Geotechnical Data Report • Geotechnical Interpretative Report
MID AMERICA TERMINAL IMPROVEMENTS
ST CLAIR COUNTY, ILLINOIS The services of Gonzalez were procured by Crawford, Murphy, & Tilly, Inc. (CMT) to provide geotechnical investigation and design recommendations for proposed terminal improvements at MidAmerica St. Louis Airport (MAA) in St. Clair County, Illinois. The modifications were made necessary due to significant growth at the airport over the past several years, increasing in annual passenger enplanements from 13,542 in 2013 to 123,841 by the end of 2017. Improvements proposed for the project include expansion of the existing 2-story terminal facility, passenger curbside modifications, terminal apron fillet widening, and entry/exit roadway reconfiguration.
Gonzalez reviewed extensive historical geotechnical data and used this information to develop a targeted geotechnical investigation. Gonzalez conducted a subsurface investigation that included 9 soil borings at the locations of proposed MAA improvements. Borings were taken at a range of 10—40 feet in depth using hollowstem auger drilling methods. Gonzalez performed laboratory tests on selected soil samples, including visual classification, water content, Atterberg limits, grain-size analysis, unconsolidated-undrained triaxial tests, and consolidation tests.
Upon completion of the subsurface investigation, Gonzalez prepared the project’s geotechnical report. Based on the proposed improvements to MAA facilities and composition of the soil at the project site, shallow foundation and below-grade wall geotechnical design recommendations were provided.
42ND & Q STREET SEWER SEPARATION
OMAHA, NE Gonzalez was hired to prepare preliminary and final design for separation of an existing combined sewer into separate sanitary and storm sewer systems in the City of Omaha. The project is located in the area surrounding the 42nd Street and Q Street intersection, and is part of the City of Omaha’s Long Term Control Plan (LTCP). The sewer separation project eliminated CSOs 207 and 208, two outfalls into Blood Creek.
The preliminary design was on a short schedule, to accommodate the 42nd & Q St. bridge project design underway in the center of the CSO area. The Gonzalez/CSO project recommendations were incorporated into the bridge project design. Gonzalez was then retained by the City of Omaha for completion of final design in the remaining CSO area.
The Gonzalez team evaluated the existing system conditions and developed four separation alternatives for a Basis of Design Report. The chosen alternative for construction includes: 7,270 linear feet of new storm sewer; 840 linear feet of new sanitary sewer; a bioretention system in Hitchcock Park; a storm sewer tunneling installation beneath a railroad; a sanitary sewer tunneling installation beneath Q Street; and existing street and sidewalk removal and replacement.
Geotechnical services provided include:
Geotechnical desktop survey of existing soils information to evaluate conceptual design of project components
Preparation of geotechnical desktop survey report
Geotechnical subsurface investigation and laboratory testing
Preparation of Geotechnical Report
Preparation of Specifications for tunneling construction
WEST PAPILLION CREEK BANK STABILIZATION
OMAHA, NE A section of embankment along Barrington Park Trail collapsed during a storm event. The creek carries runoff from a 15 square mile watershed in the City of Omaha. The City of Omaha requested Gonzalez analyze the erosion problem and provide a design solution for repair. The project involved evaluating and developing a streambank stabilization and internal drainage solution, coordination with regulatory and public agencies for permitting approval, and preparation of construction bid documents. The project required permitting through the City of Omaha, Papio-Missouri River Natural Resources District, and the US Army Corps of Engineers. The design team managed the project from initial analysis through the construction phase.
Services provided by Gonzalez include:
Investigation of Creek Bank Erosion
Review of existing drainage studies in the project area
Hydrologic & Hydraulic (HEC-RAS) analysis of creek and surrounding watershed area
Evaluation of alternate methods of bank stabilization
Preparation of final design plans, specifications, and cost estimate
Preparation of local and federal permit applications
Construction documents and bidding assistance to the City of Omaha
Final bid item list and quantities
Construction observation and support
WILD HORSE CREEK RD. BRIDGE REPLACEMENT
WILDWOOD, MO Gonzalez acquired Sequoia Engineering & Environmental who was contracted by the City of Wildwood, Missouri to provide geotechnical services and environmental testing services for the proposed replacement of the Wild Horse Creek Road Bridge (Structure No. 4602092) over a branch of Wild Horse Creek. The project is located along Wild Hose Creek Road between the intersections of Babler Forest Road and Puellman Road in St. Louis County.
The existing bridge is a precast concrete deck beam and stone block abutment with wingwalls. The proposed replacement bridge is a single-span superstructure founded on driven H-pile supported abutments.
