Hampstead WWTP ENR Upgrade
Location Hampstead, MD
Client Carroll County, Dept. of Public Works, Bureau of Utilities
Size 900,000 GPD
Costs $23,120,000
Date of Completion 2021
Services #Architecture #Civil / Site Engineering #Construction Services #Consulting #Structural Engineering #Water / Wastewater Engineering
Sectors #Consulting #Government #Infrastructure #Stormwater Management #Wastewater Systems
The Town of Hampstead and its surrounding region are designated growth areas in Carroll County, but development was limited by temperature restrictions and the resolution of a Clean Water Act Consent Judgement at the 0.9-mgd Hampstead WWTP.
In 2013, Carroll County initiated an engineering planning and design program with GMB to alleviate these restrictions. After 5 years of comprehensive planning, design, and negotiations, the Consent Judgement was on a path to resolution and the NPDES permit was renewed to allow for the Hampstead ENR Upgrade Project to proceed.
The required improvements included ENR nutrient treatment, split outfall discharge, retiring an old, failing industrial WWTP, an Alternative Effluent Limit for temperature, and improvements to the Deep Run and Piney Run watersheds.
Development in the County’s designated growth areas has been rejuvenated and environmental resources such as Piney Run and Deep Run in Carroll County have been preserved.
This project was awarded a 2023 Engineering Excellence Honor Award from the American Council of Engineering Companies of Maryland (ACEC-MD).
Project elements included:
- New mechanical screening & grit removal equipment
- New flow equalization tank
- Conversion of existing oxidation ditches to a 5-stage activated sludge treatment process
- Rehabilitation of two clarifiers & construction of a new clarifier
- New Return Activated Sludge (RAS) pumping station
- Rehabilitation of existing upflow sand filters & existing effluent UV disinfection equipment
- New chemical feed systems, yard piping, & SCADA system
- New effluent pumping station
- 5,800 feet of new 12-inch force main
- 5,100 feet of new 15-inch influent gravity sewer interceptor
