Attachment_2_Seven_Bays_Wastewater_Operation_Manual.pdf

This document is an Operation and Maintenance Manual for the Seven Bays Marina Wastewater Treatment Facility located in Lincoln County, Washington, designed and prepared by Bush & Gudgell Inc. in 1990.

The manual provides comprehensive guidance for system operators responsible for maintaining an onsite wastewater treatment and disposal system designed to handle approximately 6,954 gallons per day of combined wastewater from boat pump-out facilities, comfort stations, retail spaces, fish cleaning stations, and a future restaurant. The system consists of multiple components: a sanitary sewer lift station with two ABS Piranha-5 lift pumps operating at 79 gallons per minute against 104 feet of total dynamic head; six precast 2,500-gallon septic tanks (15,000 gallons total capacity); a 2,500-gallon dosing tank equipped with an O.S.I. Model 642 siphon; and an underground pressure distribution system with four lateral lines containing perforated pipes serving a 5,820-square-foot absorption field. The manual details operational procedures for pump station controls including level control bulbs and check valves, septic tank maintenance requiring semi-annual sludge and scum level inspections with pumping when sludge reaches within 8 inches of the outlet device, dosing tank operation limited to four doses daily, absorption field monitoring through three monitoring ports, and a grease trap requiring annual inspection. Maintenance schedules include weekly dose recording, monthly pump station visual inspections, semi-annual component checks, bi-annual effluent sampling for BOD and suspended solids, and yearly sludge depth measurements. The manual emphasizes operator responsibilities to maintain operational records, communicate with Lincoln County Environmental Health and Washington State Department of Social & Health Services, understand safety hazards associated with sewers and electrical equipment, and follow strict emergency response protocols including system shutdown and agency notification procedures.