Publication Summary

This is the quality assurance project plan for the Investigation of Petroleum Products in Black Lake Sediment and Surface Water from Underground Tanks.

Groundwater under Black Lake Grocery (near Tumwater, Washington) is known to be contaminated with petroleum products from leaking underground gasoline tanks. Although a remedial technology (treatment wall) has been developed and implemented in November 2004 for treating the contaminated groundwater, sediments and lake water down gradient of the tanks have never been evaluated for hydrocarbons or impacts to benthic communities. This project will determine if Black Lake sediments and surface water have been impacted by contaminated groundwater from the Black Lake Grocery site. Samples will be collected to determine the presence, or absence, of petroleum products in surface sediments and water down gradient of the remediation site. If sediment results show elevated levels of petroleum hydrocarbons, a follow-up sampling, using sediment bioassay, will be conducted to evaluate toxicity to aquatic life. Data from this study will be used to determine if remediation of Black Lake sediments is needed.

Link to EIM data for User Study ID RCOO0005