Energy & Utility

Third Street Sewer Project

Mount Vernon, New York

Project Overview

MFS Consulting Engineers & Surveyor, DPC (MFS) was contracted by Henningson, Durham, & Richardson Architecture and Engineering, P.C. (HDR) to provide professional geotechnical engineering services in support of the Mount Vernon Pumping Station and Force Main project located in Mount Vernon, New York. The project consists of construction of a new pump station and force main along West 3rd Street in Mount Vernon, New York. The proposed pump station is located along West 3rd Street between South 9th Avenue and South 10th Avenue. The assumed discharge point of the force main is along West 3rd Street between South 9th Avenue and South 7th Avenue.

Mount Vernon, New York

Project Details

MFS coordinated with our in-house drilling agency (MFS Construction, LLC) to drill four (4) test borings and two (2) monitoring wells at the project site, to investigate the general subsurface conditions at the proposed pump station and along the proposed force main alignment. Each of the borings were conducted in parking lanes/sidewalks using miscellaneous signs and cones for maintenance and protection of traffic.

MFS obtained samples continuously from grade through the soil overburden until rock was encountered or until the boring termination depths. Rock core samples were obtained in two (2) of the four (4) borings. At the completion of two (2) of the borings, groundwater monitoring wells were installed to depths of approximately 21 to 30 feet below grade.

MFS observed the subsurface conditions and generated test boring logs to include soil classifications in accordance with the Unified Soil Classification System, action of equipment, and other noteworthy observations. The boring logs showed borehole and sample diameters and depths at which drilling, or sampling methods or equipment change. The logs showed total depth of penetration, blow counts, and types of sampling. The drilling equipment make and model, drilling method, date and time drilled, casing, any heaving conditions, loss of circulation, voids, or any other conditions observed during drilling were also be noted on the logs. Groundwater readings were obtained within the completed monitoring wells using a Solinst water level indicator.

Laboratory tests were performed to classify soils and obtain geotechnical physical characteristics for soils and rock. The results of the field investigation and laboratory testing program, evaluation of the subsurface conditions, and our geotechnical engineering recommendations were presented in a written geotechnical engineering report. The MFS Geotechnical Engineering Report provided foundation and design recommendations including design groundwater elevation, seismic evaluation, soil and rock design parameters, and design considerations for the pump station and force main. In addition, MFS provided construction considerations for the excavations, groundwater control, subgrade, fill, and compaction requirements, and construction monitoring and instrumentation.


  • Owner:
    Mount Vernon

Services Provided

  • MFS provides professional geotechnical engineering services including geotechnical investigation and subsurface exploration, soil engineering services, and permeability testing.