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Conditions Assessment of Aerial Crossing Assets
Virginia Beach, VA
As a subcontractor, ECE conducted visual inspections and condition assessments of the City of Virginia Beach DPU’s 54 active water, sewer, and sewage force mains that cross over water bodies (aerial crossings). ECE completed digital forms presenting both the general characteristics of the crossings and the observed facility conditions along with recommendations. ECE’s project manager assisted with field efforts and co-authored the assessment report which documented the condition assessment criteria and results. This report included a summary of the field and desktop assessment methodologies, findings, remediation prioritization, recommendations, and feasibility level cost estimates for the recommended follow-up actions and capital improvements.
Field inspections involved visual inspections on foot where crossings are visible from land, and from boats where crossings are hung under roadway bridges spanning the waterways. Condition observations were recorded for piping, support structure, and general location-specific issues potentially affecting the crossing itself or access for remediation. Based on observations, field conditions, and/or record information, some crossings were identified for follow-up actions to further evaluate condition or criticality. Examples include non-destructive testing to assess wall thickness on older pipelines and desktop reviews of piping network to further assess risks by determining service bypass options if crossings were not available. Physical condition for each of the major components was rated based on a scale of 1 (excellent condition) to 5 (very poor condition). Desktop service-level criticality and risk assessments were also applied to address both service-specific and location-specific conditions for each crossing to develop a relative prioritization for crossing remediation. Criticality rating of 1 (low) to 3 (high) was assessed for each crossing based in part on proximity to critical users such as hospitals, schools, and resort/tourism areas. Other factors for criticality included pipe size and relative traffic ratings for the associated roadway. Relative risk was assessed by multiplying the physical condition rating by the criticality rating to provide a weighted risk value for each crossing and establish the prioritization. ECE’s efforts on this project were successfully completed within budget and schedule constraints. Added value was provided by applying forethought regarding endues of the final report documentation and preparing the final report as a living document for city operations personnel.
Hubner Building Waterproofing Design
Environ-Civil Engineering, (ECE) was contracted by the Maryland Department of General Services (MDGS) to provide engineering design and construction management services to stop water from infiltrating into the Hubner building during storm events. The services were provided in 5 phases: Phase I - Schematic/Conceptual Design; Phase II – Design Development; Phase III – Construction Document; Phase IV – Bidding Phase; and Phase V – Construction Phase. The description of the work performed is as follows:
Phase I - Schematic/Conceptual Design: Site visits were conducted to evaluate site conditions and obtain background information for input in the conceptual design process. All the existing as-built drawings for the site were reviewed and evaluated. Data gaps were identified and filled prior to the start of the conceptual design. Additional field tests were performed to identify infiltration routes to the inside of the building.
Phase II – Design Development: ECE prepared drawings and documents that comprised of Schematic Design Phase, including elevations and cross sections. A site development plan that showed the existing project structures, utilities, roads, sidewalks, grades, parking facility and pertinent structures in the vicinity of the project site was prepared by ECE. All calculations, proposed alterations and/or work were shown on the drawings.
Phase III – Construction Document: ECE prepared the design and construction documents which were produced and submitted at 50%, 90% and the 100% final phase to MDGS for review and approval. ECE attended two meetings during the design and construction phases of the project to discuss progress and schedule. An estimate of probable construction costs of the project and construction schedule were prepared and submitted to MDGS.
Phase IV – Bidding Phase: ECE attended a pre-bid meeting to provide clarifications on questions submitted that the general contractor asked on the construction document. ECE looked at the bid submitted to MDGS to analyze and compare with probable construction costs prepared by ECE.
Phase V – Construction Phase: The construction phase services provided by ECE included conducting pre-construction meetings, review of contractor submittals, review of construction schedules, review of design scope changes, responding to RFI’s and RFP’s, scheduling and attending progress meetings and site visits to discuss and resolve problems, preparation of construction progress reports and meeting minutes, review of construction contract change orders, review cost proposals and assisting the agency in negotiations, review of contractor payment requests, resolution of on-site issues and conflicts that were identified during construction and preparing a list of defects and omissions related to the work performed for the contractor. ECE prepared the punch list and performed the final work through to close out project.
Oil-Water Separator Efficiency Study
Tyndall AFB, FL
ECE performed a study to determine the efficiency of oil-water separators in treating Tyndall AFB wastewater. ECE investigated and characterized the processes and activities which occur at each oil water separator (OWS). ECE also investigated the capability of existing OWS to provide sufficient pretreatment to comply with the Bay County Advanced Wastewater Treatment (AWT) Standards, and recommended cost-effective solutions that would meet the Bay County AWT Standards.
Remediation of Retaining Crownsville Wall
ECE provided Site Engineering Services with permitting for sediment and erosion control plan. A preliminary site investigation was conducted to evaluate design options. A preliminary site reconnaissance included walk through of the site to observe the retaining walls and gain a general understanding of site topography and associated relieves that may be important in developing a subsequent grading plan. The site conditions and man-made structures that may affect the grading plan were compared with the existing site plan. Based on the site investigations, a preliminary grading plan and erosion and sediment control plan were developed.
A subsequent contract document was then prepared. ECE developed a detailed plan that showed the proposed site grading; developed erosion and sediment plan which depicts the proposed contours on the existing contour provided by MDGS and showed the location of sediment and control devices and details.
ECE applied and obtained permits for the grading and sediment & erosion control plan and responded to comments received from contractor during bidding process.
Spill Prevention Control and Countermeasures Plan (SPCCP)
Environ-Civil Engineering, Ltd. (ECE) performed spill prevention control and countermeasures study to assist Maryland Transportation Authority to ensure that oil does not get to the waters of United States at its facilities. The facilities are: JFK Maintenance I, JFK Weigh and Inspection Station, Francis Scott Key Bridge Maintenance, Fort McHenry Tunnel Maintenance, and Harry W. Nice Bridge Maintenance. ECE personnel conducted site visits to study the physical condition of facilities, observe oil storage areas, spill containment structures, existing conditions, storm sewer locations and associated outfalls, storage tank operations and housekeeping practices. A spill prevention control and countermeasures plan was prepared at the conclusion of our study. The plan outlines a comprehensive spill prevention program to minimize the potential for oil discharge from facilities.