After reporting a spill to the Department of Ecology on July 17, the city of Snoqualmie took samples from the Kinsey Pond catch basin, pond, and equipment left by a contractor for parking lot seal on a private lot. A stormwater detention pond, Kinsey Pond is located on Snoqualmie Ridge adjacent to the IGA shopping center. There is no impact to the public or to wildlife, according to the city.
Lab results from Amtest Laboratories of Kirkland revealed a trace amount of hydrocarbons (300 ug/L) or .3 parts per million (ppm). For comparison, four drops from a dropper in a 55-gallon barrel equals 1 ppm; this is .3 ppm or one (1) drop in a 55-gallon barrel.
The city tested for a clay component of the asphalt sealer, which could contribute to the red coloration. The Department of Ecology will make a final determination on this after reviewing lab results, and the city of Snoqualmie will follow through with their recommendations.
Stormwater detention ponds such as Kinsey Pond are designed to catch all spills, asphalt, and brake dust from roads and treat it over time. The ponds are in place near impervious infrastructure throughout the city to provide protection for the Snoqualmie River and all local streams.
For more information contact Todd Saxberg, operations manager of utilities, at firstname.lastname@example.org.