The Villages at Dakota Crossing is a 63-acre mixed-use development combining low-rise residential and retail components. Site development included approximately 234 townhomes as well as restaurants and a fitness center. GeoCapitol’s staff provided a geotechnical engineering investigation of the site as well as a Phase I Environmental Site Assessment. Subsurface conditions were investigated by drilling 64 test borings as well as excavating five test pits. Recommendations were provided regarding foundations, ground improvement techniques, removal and replacement of existing fill, lower floor slabs, lateral earth pressures for basement walls, subdrainage, pavements, retaining walls, earthwork, and site utilities.
During construction, GeoCapitol’s staff provided full time quality control testing for the preparation of subgrades and pavement sections for internal roadways within the development. Due to marginal subgrade soils, subgrade preparation included removal and replacement of excessively soft soils and the use of geogrid reinforcement. During asphalt placement, GeoCapitol’s staff provided roller pattern based density testing of the pavement areas to verify asphalt compaction.
GeoCapitol provided geotechnical and environmental services for Phase 1 of the 67-acre Hill East District Waterfront Redevelopment in Southeast, Washington, DC. Construction plans include two mixed-use buildings including 354 apartments, up to 40,000 SF of retail, and approximately 222 parking spaces.
GeoCapitol completed a Phase I and a limited Phase II Environmental Site Assessment (ESA) for parcels F-1, G-1, and G-2. The environmental reports were utilized to develop the Environmental Impact Screening Form (EISF), which is required by DC development agencies. GeoCapitol also provided geotechnical engineering design services which they completed concurrently with the limited Phase II ESA, significantly reducing the investigation costs for both studies.
The geotechnical and environmental investigation included drilling 14 soil test borings and screening soil samples with a photoionization detector (PID) to detect the presence of volatile organic compounds (VOCs). Based on their engineering analyses of the data collected, GeoCapitol provided recommendations for foundations, lower floor slabs, lateral earth pressures, subdrainage, earthwork, and excavation support. Separate reports were provided to the client detailing the findings of the geotechnical engineering study and Limited Phase II ESA.
GeoCapitol provided geotechnical engineering and hydrogeologic services for multiple projects at the 66-acre redevelopment of the historic former Walter Reed Army Medical Center campus. Construction plans include 2,100 residential units, two charter schools, a town center with a large-format grocery store, 185,000 SF of office space, an ambulatory care clinic, and 14 acres of open space.
For their first project at the site, they were contracted to perform a geotechnical study and hydrogeologic study for landbays A to J. They proposed completing the two studies concurrently to reduce costs and expedite the two studies which was approved by DMPED. Two separate reports were developed detailing findings from the geotechnical engineering study and the hydrogeologic study which included recommendations to aid DMPED in planning for the site development.
GeoCapitol also provided geotechnical engineering services for the Delano Hall (Building 11) Renovation and Addition to be occupied by the DC International School (DCI). Construction will include an addition on the west side, parking lot improvements, stormwater management, and major interior renovations such as adding an elevator and stairs. Subsurface conditions were investigated by drilling eight test borings and two offset auger probes. Constant Head Borehole in-situ infiltration testing was also performed using a Johnson Permeameter. The geotechnical report included recommendations regarding foundations, lower floor slabs, lateral earth pressures, subdrainage, pavements, earthwork, and excavation support.
GeoCapitol provided geotechnical engineering services for redeveloping an existing shopping center in Ward 8 to construct a 6-story mixed-use building with 195 residential units, 5,000 SF of retail space, and one-level of below grade parking. Subsurface conditions were investigated by drilling a total of four test borings in the proposed building area.
GeoCapitol performed the engineering analysis including evaluating multiple foundation options. Spread footings supported by soils improved with aggregate piers was recommended because the conventional spread footing foundations bearing directly upon the existing fill would be unacceptable for the proposed construction. Upon completion of the aggregate pier installation, conventional spread foundations can be constructed in accordance with commonly accepted methods. GeoCapitol provided additional design recommendations for lower floor slabs on grade, lateral earth pressures and subdrainage, temporary construction dewatering, permanent subdrainage, and earthwork.