TagWater Quality(478)

In April 1999, the Washington State Department of Ecology requested contract services to independently review a groundwater study being conducted by the Port of Seattle at Sea-Tac Airport. The study aimed to determine whether groundwater contamination at the airport posed a risk to nearby surface waters and public water wells. Contract experts were needed to evaluate the Port's conceptual groundwater models, three-dimensional MODFLOW computer simulations, and proposed field monitoring work.

A March 30, 1999 follow-up phone call was made to Kevin Fitzpatrick of Ecology regarding a WER (Waste Equivalency Ratio) work plan renewal and a mixing zone study approach for a project near Sea-Tac Airport. Fitzpatrick indicated that Gary Bailey would assist with the WER work plan alongside Randy Marshall, and Norm Glen would review the mixing zone approach, but Kevin wanted to wait until after an April 1, 1999 meeting before proceeding. Key outstanding questions included whether existing outfalls already meet treatment standards and whether the Puget Sound Stormwater Manual technology standards would apply to existing outfalls at the site.

This document consists of a fax transmission from Parametrix, Inc. to Scott Tobiason at the Port of Seattle, dated March 29, 1999, transmitting water quality data logs and flow weighting calculation worksheets for WGR (water quality) samples collected from receiving streams on February 22, 1999. The attached field data logs record measurements such as pH, temperature, dissolved oxygen, and water levels at a site designated 'WC,' along with observations of rain, sheen, and water color during sampling. A flow weighting calculation worksheet for the 'Walker' site summarizes subsample volumes and calculates a total storm flow of 33,030 units for a 30-inch pipe.

This document presents results from a 48-hour acute toxicity test conducted in February 1999 for the Port of Seattle, exposing water fleas (Ceriodaphnia dubia) to copper-contaminated water collected from Miller Creek. The test found that all organisms survived at concentrations up to 50 micrograms per liter, while complete mortality occurred at concentrations of 100 micrograms per liter and above. Water quality parameters including pH, dissolved oxygen, and specific conductivity were monitored throughout the test period.

Draft report (AR 041921) prepared by Parametrix, Inc. for Port Of Seattle, STIA, summarizing procedures and results of acute screening-level Ceriodaphnia dubia bioassays conducted on site water from Seattle-Tacoma International Airport in January 1999. Samples collected January 14, 1999 during a storm event at eight locations including Miller Creek Upstream of Lake Reba, Miller Creek

These are field records from a water quality sampling event conducted on January 14, 1999, at the Miller DS site near McD NC, documenting storm water measurements taken from a culvert. Samplers recorded water levels, flow rates, pH, temperature, and dissolved oxygen at 12 intervals throughout the morning. A flow-weighting calculation worksheet was used to determine subsample volumes, with a total storm flow of 122,400 units recorded from a 4x4.3 pipe.

Port Of Seattle 1999 Airfield Project Soil Fill Acceptance Criteria for STIA airfield projects, describing criteria and review process for acceptance of fill material requested by Washington Department of Ecology in conjunction with 401 Water Quality certification. Covers geotechnical and environmental suitability standards including MTCA Method A contaminant levels, arsenic, TPH and metals analyses. Details

Washington State Department of Ecology, Water Quality Program publication (WQ-R-95-80, revised December 1998) providing laboratory guidance and Whole Effluent Toxicity (WET) test review criteria. Covers WET testing requirements in NPDES permits, options for permittees, invalid test criteria including EPA statistical flowcharts, negative controls, test termination, acceptable start counts, pH adjustment, randomization, and power standards. Also

This December 1998 internal memorandum from Justin Kophs to Linda Logan outlines options for developing a site-specific copper translator for the Port of Seattle, summarizing EPA guidance on dissolved and total recoverable metal sampling studies. It describes recommended approaches including field partitioning studies, historical data equations, and laboratory mixing tests to measure how copper partitions between dissolved and total recoverable forms in receiving water. The memo notes that while a site-specific translator improves compliance measurement accuracy, it cannot be used to influence permit limits in the same way as a Water Effect Ratio (WER).

Email from Steve Saunders (November 21, 1998) to Melodie Selby, Robert Barwin, John Glynn, Carl Nuechterlein, and others, recommending that Melodie Selby and Bill Moore take lead on CWA Sections 401 and 402 coordination due to stormwater and BMP manual focus. Attached is a Washington State Department of Ecology Water Quality Program summary memo analyzing