Improvements to Sanitary Sewers in the Herring Run Sewershed Sanitary Contract No. 908

In 2002, the City of Baltimore entered into a Consent Decree with the Environmental Protection Agency (EPA) and Maryland Department of the Environment (MDE) to assess their entire sanitary sewer system and develop a plan for addressing all deficiencies with the intent of eliminating sanitary sewer overflows (SSOs). The sanitary sewer system was evaluated on a sewershed basis with every sewer pipe and manhole inspected.  These sewershed projects identified physical defects plus evaluated the system from a hydraulic standpoint to identify capacity needs.

Using the findings from this earlier work, George, Miles & Buhr, LLC (GMB) was tasked with developing the contract documents for implementing the needed improvements for a portion of the Herring Run Sewershed with hydraulic repairs to be addressed separately. GMB prepared a preliminary engineering report outlining the findings and making recommendations. Using the information available from the field investigation / inspection work performed under the earlier project, GMB prepared contract drawings and specifications for work encompassing over 1,800 LF of mainline sewer pipe replacement, over 38,000 LF of mainline sewer Cured-In-Place Pipe (CIPP) lining, approximately 190 mainline sewer excavation point repairs, 13 mainline sewer non-excavation point repairs, over 250 Sanitary House Connections (SHC) excavation point repairs, over 310 SHC non-excavation point repairs, 15 new or replacement manholes, over 40 manhole excavation repairs, nearly 60 manhole non-excavation repairs, and investigating nearly manholes that were previously unable to be field-located or opened.

In addition to the repair and rehabilitation work itself, GMB’s design also included Maintenance of Traffic (MOT) site restoration, Erosion & Sediment Control (E&SC), forestation, and access roads.