Resolution 3528 - Laserfiche WebLink

wetland complex is ready to receive water. Meanwhile, some sampling of treated filters discharge water has been completed during times when the filters were operating. At this time, only limited sampling data is available. However, for the two water quality samples taken by Dames and Moore, the oil and fuel component of the surface water discharged from the peat filter was below detection limits. • The design criteria for discharge from the peat filters is for fuel and oil concentrations not to exceed 0.7 mg/1 in accordance with the most restrictive downstream fisheries habitat requirements (see DEIS App. C - Surface Water, pg 1-17, and FEIS pg 3-27). • Fuel and oil is the major component of total oil and grease. State water quality criteria for total oil and grease in surface water runoff is 10 mg/1 average daily, and a maximum of 15 mg/1 (DEIS, App. C - Surface Water, pg 1-17). • The Decision Document requires the following: - A water quality monitoring program must be submitted to and approved by the City prior to occupancy of any structure located in the area draining to the main fork of Powder Mill Gulch. Water quality shall be sampled at the outfall of the peat filter system and at the planned outfall of the created wetlands. 1. The design goals of the peat filter system for discharge not to exceed 0.7 mg/1 for fuel and oil (see DEIS App. C -Surface Water, pg 1-17) should be met. In no event shall fuel and oil discharges from the peat filter system exceed levels which will result in a failure to protect downstream fisheries habitat. 2. A monitoring and contingency plan to accomplish these goals for the basin must be reviewed and approved by the City (see DEIS App. C -Surface Water, pg 2-8). 3. The approved contingency plan shall be implemented by Boeing in the event the design goal is not met, identify the source of pollutants and remedial options for review and approval by the City (Decision Document: General Mitigation (4) Surface Water, pg 14). • Boeing's existing operational procedures include the following schedule: - Provide daily inspection and cleanout of any accumulated fuel and oil, and periodic cleaning of sludge and sediments for the fueling stall separator(s). - Monitor and clean other oil-water separators within Powder Mill Gulch and Japanese Gulch weekly. - Monitor and clean Type II catch basins quarterly; remove floating debris 12