Natural Resources Damage Assessment (NRDA) of Toxic Impacts of Acid Mine Drainage on Invertebrates and Fish
Pacific EcoRisk assisted in the design of a field sampling program, and supervised the laboratory testing of water samples collected from throughout the watershed associated with the Leviathan Mine, including East Fork of the Carson River. The laboratory testing consisted of acute and chronic aquatic toxicity tests with fish and invertebrates to assess the toxic impacts of pH and metals contamination resulting from Acid Mine Drainage into this important Sierra watershed.

SUPERFUND (CERCLA) Toxicity Testing of Metals-Contaminated Sediments
As part of a CERCLA evaluation of acid mine drainage, Pacific EcoRisk performed toxicity evaluations of sediment porewater and sediment elutriates contaminated with high concentrations of several heavy metals. This included performance of sediment porewater TIEs to determine the cause(s) of any observed toxicity.

Development of Site Specific Ambient Water Criteria for Cobalt
As part of a CERCLA evaluation of the effects of acid mine drainage, Pacific EcoRisk performed toxicity evaluations of cobalt to determine site-specific ambient water criteria for this compound in a receiving water stream. This included performance of acute toxicity tests with the standard test species Chironomus tentans and rainbow trout, as well as with resident invertebrates collected from the receiving water stream system. This testing also included the performance of the 60-day rainbow trout test and the Chironomus tentans life-cycle test.