Wastewater for Small Communities

Coulee City installed a new sewer collection system and 30 acres of evaporative lagoons to treat 72,000 gallons per day in 1998. With in 1 year the lagoons were failing due to excess flows. WQE completed a 1 year watershed evaluation to determine sources of excess water. Solutions to remove groundwater and stormwater from the wastewater collection system were evaluated and most cost effective solutions were approved by Department of Ecology. WQE prepared grant and loan application for design and installation of a sump pump collection system and expansion of the wastewater facility. WQE is providing management and engineering services for design and installation of the sump pump collection system and expansion of the evaporative lagoons. The project has been ongoing from August 2000 to present.

Project Management: Water Quality Engineering
Project Team: WQE, Pacific Groundwater Group, Economic & Engineering Services

WQE has provided engineering and design services for renovation of a failing recirculating sand filer and pressurized soil disposal system. WQE provided site evaluation of soils, managed surveying, and completed engineering for the dosing tank, UV disinfection, and disposal of treated wastewater in a sub surface drip disposal system. As project engineer, WQE is also responsible for review of all design of the Advantex wastewater treatment pods and construction oversight. The facility has capacity to treat and dispose on site 30,000 gallon per day. The Adams View development project is managed by the Yakima Nation Housing Authority. The subsurface drip disposal system has been integrated into a reuse project providing water and nutrients for a public park and athletic field. Project completed in November 2004.

Project Management: Fextex Systems, Inc
Project Team: Fextex Systems, Inc and Water Quality Engineering, Inc., Pacific Groundwater Group

WQE provided design, construction management, and performance evaluation of constructed wetlands and soil filters for polishing nitrogen and phosphorus from secondary wastewater effluent prior to discharge to a salmon stream. Total nitrogen removal was greater than 95% while best TP reduction was about 60%. The effluent target limits were 80 ug/L TP. Project design flow was 64,000 gpd.

Project Management: Cascade Earth Sciences, Medford, OR
Project Team: Cascade Earth Sciences, Water Quality Engineering, Montgomery Watson, Inc.

WQE provided design and engineering services for treatment of 42,000 gallons per day of rest stop wastewater. The nitrifying and denitrifying treatment facility utilized state of the art design of recirculating sand filters and denitrifying wetlands.  WQE was a subcontractor for prime contractor Hammond Collier Wade Livingstone, Inc. HCWL provided all other engineering and design for collection and tertiary treatment for production Class A reuse water. The project was not built due to high costs associated with design of the facility for production of Class A wastewater for reuse on lawns and in restrooms.

Project Management: Hammond Collier Wade Livingstone
Project Team: Water Quality Engineering, Southeast Environmental Engineering

A high groundwater table in Coulee City causes low storage and poor infiltration during rains and snow melt which results in flooding around town. To alleviate the problem a groundwater and stormwater collection system were designed. The existing storm drain system was reevaluated for its effectiveness to capture the City’s storm water runoff and flows from residential sump pumps. Catchment areas were identified for each catch basin, and collection pipes and catch basins were designed for flood prone areas. Flow from the entire storm water system was redirected to storm water treatment ponds and then used to renovate Coulee Lake.

Project Management: Diane Owen, PE
Project Team: Water Quality Engineering, Southeast Environmental Engineering

HOME | SERVICES | KEY PERSONNEL | JOB OPPORTUNITIES | NEWS | CONTACT US
(WQE) Expertise in Environmental Engineering and Science