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Baltimore City Urgent Needs
The City of Baltimore’s Sanitary Discharges of Unknown Origin Program is to identify, investigate and eliminate sanitary discharges in the city’s storm drain system. This program was started to comply with the EPA Consent Decree provisions.
A field crew tests storm drains at various locations within the city and identifies locations which test positive for the presence of ammonia (an indicator for sewage) in the water. Once a location is identified, ECE is tasked with investigating the area to identify the source and device solutions to eliminate the discharge.
During the investigation, ECE performs document research, coordinates CCTV and dye testing activities, performs CCTV video reviews, identifies sewer segments for lining, assists in drafting letters to the HCD (housing and community development) on behalf of the Wastewater engineering division is case of a plumbing code violation etc.
City Lock River Crossing Inlet and Junction Chamber Improvements & Goodes Creek Gate Structure
Richmond's wastewater treatment plant (WWTP) serves approximately 58,000 customers in the city and is the largest of its kind in Virginia. Located along the south bank of the James River, the plant can treat up to 70 million gallons a day of sanitary sewage and stormwater before returning it to the river. The wastewater utility also operates and maintains 1,500 miles of sanitary sewer, pumping stations, 38 miles of intersecting sewer lines, and the Shockoe Retention Basin, a 44-million gallon stormwater reservoir used during heavy rains. The WWTP treats wastewater flows arriving from both the north and south sides of the James River, traveling beneath the river in some instances. The Twin 66s are a pair of 66-inch diameter concrete interceptors, traveling from Chapel Island on the north bank of the James River to the south bank of the James River at the WWTP. The Twin 66s have a large concrete Inlet Chamber, which collects flow before discharging into the Twin 66’s, and a large concrete Junction Chamber, which received flow from the Twin 66’s. The City Lock Project is for the structural additions to the existing Inlet and Junction Chambers. It also includes a new buried concrete gate structure and 72-inch sluice gate on the Lower Goodes Creek Interceptor along Brander Street.
The structural addition will provide access from grade to the Twin 66-inch siphons and the 96-inch Shockoe Interceptor for cleaning and maintenance. The project also includes design for a permanent all-weather access road from the Shockoe Retention Basin on Chapel Island to the location of the Inlet Structure near Richmond City Lock. The City of Richmond has requested that bid documents be compiled for the structure modifications and the new gate structure, including plans, specifications, and a project book for bidding general contractors. ECE was sub-contracted on as a sub-consultant whose tasks included design, drafting layout, sub consultant coordination, survey, geotechnical exploration and recommendations, field research, client meetings, and general project administration.
Baltimore County Consent Decree
Environ-Civil Engineering (ECE) is currently working on a project for the Baltimore County Department of Public Works (DPW). Consent Decree is a project proceeding by Baltimore County lodged with the United States Department of Justice (DOJ), the Environmental Protection Agency (EPA), Maryland Department of the Environment (MDE) about eliminating the current and historical sanitary sewer overflow (SSO) occurrence in 23 priority and non-priority Baltimore County sewersheds.
The Engineer assigned to this project responsibilities include: updating regular data, tracking communication between the county, and regulators, preparing a monthly report to the county, and annual/quarterly reports for review by EPA and MDE. Furthermore, he conducts overflow event investigations for DPW Bureau of Utilities of root cause analysis and preventative method recommendations.
The Project Manager assigned to this project provide a variety of different tasks, from managing the crew members to assisting in the development of the project. She manages the manhole inspection crew and manages the manhole media data for the end client. She also assigns the crew their work schedules, tracks their work for inconsistencies, and makes sure the equipment is in proper working condition. In addition, the Project Manager also manages their weekly data reports, Quality Assurance (QA)/Quality Control (QC) using the Manhole Assessment Certification Program (MACP) inspections for completeness and correctness, sending weekly completed work to the county. She collaborates with the client regarding assignments and responding and coming up with solutions to their inquiries.
ECE’s Crew Leader responsibilities include: locating and inspecting sewer manholes with a High-Density camera. He also files and logs progress reports of findings to the National Association of Sewer Service Companies (NASSCO) database. The Crew Leader also views the mapping of the Sewer Lines/Tunnels shoot photos for inspections to report in the Database logs.
The Field Technician tasks for this project are similar to the Crew Leader, he also responsible for the inspection of manholes throughout Baltimore County. He documents the defects and other structural issues utilizing a pole camera along with a “Toughbook” with NASSCO Pipeline Assessment Certification Program (PACP) certified software. Finally, he provides the guidance and supervision to other crew members.
DC Water Local Sewers Rehabilitation G100
The District of Columbia Water and Sewer Authority (DC Water) recently identified necessary improvements to its sewer collection system. They adopted the Sewer System Facilities Plan (Facilities Plan) produced by Engineering Program Management Consultant 3A (EPMC-3A) in June 2009. Rehabilitation projects for the sewer system were identified as Capital Improvement Program (CIP) projects in the Facilities Plan. The goal of the project is to address structural defects found through Closed Captioned TV (CCTV) inspections completed during the CIP development. The preliminary construction cost estimation is $13.0 million, which is expected to change per future revisions to the project plan.
ECE's tasks included:
Reviewed all available manhole inspection reports for manholes in the Northwest UPI Sewershed All inspection reports were reviewed for accuracy of NASSCO MACP coding to determine the appropriate rehabilitation method.
Performed field reconnaissance to identify and document potential neighborhood and traffic disruptions, verify existing conditions including photographs, and identify and document locations and requirements for contractor storage during construction.
Prepared cost estimates for the sewer and manhole rehabilitation based on a preliminary quantity take-off and estimated construction unit prices using a database of rehabilitation projects metropolitan area.
Prepared construction work plans to show all intended sewer rehabilitation work in the Northwest UPI Sewershed.
Prepared erosion and sediment control plans and details for use during the construction phase in the Northwest UPI Sewershed.
Completed a neighborhood site investigation to observe existing document potential vehicle and pedestrian traffic conflicts relative to proposed construction work limits.
All results and documents were provided in a technical report to DC Water.
Lakeside to Strawberry Hill SPS Flow Equalization Pipeline Project
Henrico County currently offers sanitary sewer service to approximately 91,600 customers and treats over 14,000 MG per year. The Flow Equalization Pipeline Project has been implemented in response to a Consent Decree for increased storage capacity prior to the Strawberry Hill pumping station and to provide redundancy and flexibility for maintenance and repair.
This project will provide 6 MG of additional sanitary sewer storage during wet weather conditions. The designed phase finished and construction phase began in fall of 2012. ECE is supporting the County of Henrico as a sub-consultant performing pipe calculation for a 114-inch diameter FRP (fiberglass reinforced pipe) interceptor to run parallel to an existing 72-inch interceptor in the southeastern portion of the County. In addition to pipe calculations for buoyancy control, ECE provided design for various concrete junction chambers; overall project management support; assistance with project coordination; and drafting support. Now that the construction phase has begun, ECE is providing construction inspection support, submittal reviews after bid and award, drafting assistance for record drawings, and general project close-out.
Rehabilitation Plan, Design, and Construction Phase Sewer Collection System (Sewershed Area 7-5 and 5-7)
This project consists of sewer rehabilitation projects in sewershed areas 5-7 and 7-5 in the City of Richmond, Virginia. Sewershed area 5-7 is bounded by Shadwell Road, Westmoreland Street, Cary Street and Hanover Avenue. Closed Circuit TV (CCTV) videos of approximately 16,200 LF of sanitary sewers and manholes were reviewed in this sewershed. Sewershed area 7-5 is bounded by Henrico Turnpike, Meadow Bridge Road, Gladstone Avenue and Brookland Park Boulevard. Closed Circuit TV (CCTV) videos of approximately 22,450 LF of sanitary sewers and manholes were reviewed in this sewershed. Excel spreadsheets with sewer line defect coding were prepared. Field inspections were performed to identify feasible alternatives for rehabilitation of sanitary sewers in these sewersheds. Suitable rehabilitation alternatives were recommended to the City along with cost estimates and detail plans for rehabilitation. ASTM F1216-07b standards were used to determine the Cured-In-Place Pipe (CIPP) lining thickness.
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.
Review of Sewershed Area 6-5
The project involves review of Closed Circuit TV (CCTV) videos of approximately 14,300 linear feet (LF) of sanitary sewers in Sewershed Area 6-5. The objective is to identify replacement/rehabilitation work needed in Sewershed Area 6-5. Observe defects in the sewer reaches are documented in an Excel spreadsheet using defect coding. Tasks include recommendation of City approved rehabilitation methods such as Cured-in-Place Pipe (CIPP), Point Repair, Open Cut Replacement, Chemical Seal and manhole rehabilitation to address the sanitary sewer line and manhole problems identified during the video review. The recommendations included open cut repair of approximately 3,000 LF of the total length of existing sewers (eleven sewer reaches), two new manhole installations, rehabilitation of nine existing manholes, uncovering of one manhole and resetting a manhole cone/riser for another manhole. Additional tasks include replacement of some sewers in existing alignment, installation of a new manhole and rehabilitation of existing manholes using services of a general contractor through competitive bids. The replacement of the existing sewers includes 50% replacement in kind (same size) and 50% up-sizing from 6 to 8 inches. Perform field surveys to show the horizontal utility locations on plans based on design utility markings by Miss Utilities. Compare the field data to the utilities in the City’s GIS files. Show vertical utility locations on profiles based on data provided by City’s test hole Contractor. Assist in the preparation of bid plans and specifications and assist in the bidding process. ECE also provides construction phase services such as reviewing construction specific submittals and contractor’s requests for information (RFI’S).
Richmond Riverfront Stormwater Watershed Master Plan
The City of Richmond wants to develop a Stormwater Master Plan for the entire city to identify and prioritize recommended capital improvement projects for mitigating flooding, strengthen or improve the stormwater infrastructure, prevent stream bank erosion and improve stream water quality. The City has identified and prioritized watersheds within the City and Riverfront Watershed is one of them.
The project is currently on-going. ECE’s responsibilities include:
- Delineating the watershed and subbasins using GIS
- Fieldwork after a storm event to observe the various types of stormwater infrastructure (inlets, culverts, ditches, etc.) within the watershed and identify potential improvements or problem areas.
- Typing up reports in a template as well as putting data into a PowerPoint presentation template to present to the City of Richmond for further evaluation.
Potential projects have been identified and will be presented to the City for its review. The City will then provide comments and the reports will be revised accordingly before action is taken.
WSSC BOA Hydraulic Modeling Study of Sewer Basins
Washington Sanitary suburban Commission (WSSC) complied with a consent decree (CD) that required that a system-wide fully-dynamic sanitary sewer system model be developed. The sewer system models developed under this contract will be applied in subsequent studies to prepare sewer system repair, replacement, and rehabilitation plans.
ECE was subcontracted to develop Dynamic Hydraulic Sewer Models for WSSC using InfoWorks CS software. WSSC provides public water supply and sanitary sewer service to approximately one million residents in Montgomery and Prince George’s Counties comprising the northern, western, and southern suburbs of Washington, DC. The primary objective of the study is to use the model to determine the existing and long-term capacity of the Commission’s wastewater collection system. Rainfall, population projections, manholes, pipes and wastewater pumping station data were analyzed in GIS and the collection system network was modeled using InfoWorks CS software. The model was run to evaluate the future dry weather flow and wet weather flow (for standardized storms). The results of the study were documented in a report submitted to WSSC. ECE performed the following steps to develop the model: Initial Data Assessment, GIS Sewer System Data Processing, and import of Data into the Model. This stage also identified and documented the critical data such as pump station information, flow diversions and standard operating procedures required to perform the modeling. The data imported was verified and validated to identify and remove duplicates, and to identify pipes and manholes with missing data to check the network against available record drawings to correct and/or fill in the missing data. Area estimates were prepared from aerial photographs using GIS tools like Arc MAP. Verification, Validation and Calibration of the Network, Dry Weather Flow Analysis, Simulations of Design Storms, Wet Weather Flow Analysis, and Capacity Analysis as well as a Final Basin Modeling Report was prepared.
Under this BOA, there have been currently 18 task orders that covered areas such as WSSC sewer basin facility plans, capacity reevaluations of wastewater pumping stations and model networks, recalibrations of model networks, modeling support, and analysis for new developments. Four of the eighteen tasks are on-going. Tasks were performed within budget and on-time.