Overview

Since 1960, Stevenson & Palmer Engineering has served many municipal, county, private, and industrial clients. At Stevenson & Palmer Engineering, Inc. we are able to meet the needs of municipal, industrial, agricultural, and private clients with solutions for: wastewater, water, stormwater, transportation, site development, planning, surveying, solid waste, inspection, funding assistance and many other civil engineering services.

Our areas of service include Environmental, Transportation, Surveying/Mapping, Governmental Consulting, and Industrial.

Featured Project

The continuous population growth of Coweta County, recurrent droughts, and the potential shortage of purchased water, necessitated the County to initiate the project of building the B.T. Brown Water Treatment Plant (WTP). Stevenson & Palmer Engineering, Inc. was chosen to provide engineering services for design and construction administration. This is the County's first water treatment plant. Previously, the County purchased drinking water from several entities, primarily the City of Newnan. The new WTP has a design capacity of 8.0 MGD. It will initially be limited by a withdrawal permitted rate of 6.0 MGD. The new B.T. Brown WTP will help provide water to the County's 22,000 customers.

The source of drinking water is the 339 acre B.T. Brown Reservoir which was a soil conservation service project, constructed in 1984 primarily for the purpose of flood control. Coweta County will now maintain the reservoir. Another source of water is from Cedar Creek. The recently revived Coweta County Water & Sewer Authority will operate the WTP.

The WTP utilizes state-of-the-art controls and instrumentation for the conventional process design treatment scheme. Raw water from the reservoir intake is conveyed via triplex pumps with a peak pumping rate of 9.5 MGD. Chemical addition of up to six different chemicals is available prior to a static mixer, followed by duplex 4-stage hydraulic flocculation chambers. Duplex sedimentation basins, employing vacuum suction sludge collectors are provided, followed by 4 foot 60 degree tube settlers. Four conventional dual-media filters complete the process treatment. Post-treatment chemical addition of up to four chemicals is provided prior to the chlorination contact/finished water clearwell of 2 million gallon capacity. High service pumps consist of two-10.1 MGD and three-5.0 MGD pumps. Alum sludge storage ponds and a modern control/laboratory building complete the facility.

Coweta County is located approximately 35 miles southwest of Atlanta in the western central portion of the State of Georgia. The County includes a 443.1 square mile area bounded to the north by Fulton County. Coweta County is part of the Atlanta Standard Metropolitan Area, as well as the sixteen (16) county Metropolitan North Georgia Water Planning District (MNGWPD). The County Seat is centrally located in the City of Newnan, which is the largest municipality in the county.

For more information contact Braiden Griffiths at 770-252-8216

Previous Featured Project

In 2004, the existing Northside Wastewater Treatment Facility in Commerce, GA was expanded from 1.05 MGD to 2.1 MGD average daily flow. The expansion was necessitated by population growth, aging equipment, and the need to meet increasing discharge standards. The original plant was built in 1974 with a design capacity of 0.7 MGD and upgraded to 1.05 MGD in 1986. The last addition was a sulfur dioxide dechlorination unit that was added in 1999. City management and the engineering staff of Stevenson & Palmer Engineering considered various options for expansions and improvements at the plant and selected the process design and associated equipment to provide a cost-effective equipment facility that would meet all state standards and allow efficient and flexible operation.

The existing bar screen was retained and existing aeration basins were converted to equalization basins. New equipment includes a grit removal unit, nitrification/denitrification aeration ditch, effluent settling tanks (clarifiers), tertiary filters, ultraviolet disinfection and effluent aeration. Solids handling uses the existing belt filter press to dewater solids from two new digesters. Dewatered sludge is landfilled. For more information, contact Bill White @ 770-952-2481.

back to top^