Common use of Additional Testing Services Clause in Contracts

Additional Testing Services. 1. An adaptive protocol will be used to initiate additional testing on each sample submitted. During the first hour of any test, if a 100% effect is seen in both the 100% and 50% sample concentrations, additional dilutions will be added to that test. For tests initially involving only 100% and 50% concentrations, three (3) additional dilutions (25%, 12.5%, and 6.25% sample concentrations) will be added. For five-dilution tests, two (2) additional dilutions (3.12% and 1.56% sample concentrations) will be added. Contractor will notify County Project Manager by e-mail as soon possible if testing on additional dilutions is performed. 2. Contractor shall also include 48 hour acute testing results in conjunction with all performed chronic bioassays with the exception of when the duration of the bioassay is less than 48 hours. 3. County may also request that testing include additional dilutions beyond the five-dilution analysis. These additional dilutions will expand the concentration series to 100%, 50%, 25%, 12.5%, 6.25%, 3.12% and 1.56%. 4. County may request that a Phase I Toxicity Identification Evaluation (TIE) be conducted on a water sample if the result of the initial toxicity test meets specific criteria defined by County. The Phase I TIE shall include the following treatments and corresponding blanks: a. Baseline toxicity; b. Particle removal by centrifugation; c. Solid phase extraction of the centrifuged sample using C18 media; d. Complexation of metals using EDTA addition to the raw sample; e. Neutralization of oxidants/metals using sodium thiosulfate addition to the raw sample; and f. Inhibition of Organophosphate (OP) pesticide activation using piperonyl butoxide (PBO) addition to the raw sample (crustacean toxicity tests only). TIE procedures should be consistent with the guidelines published by the U.S. EPA for freshwater or marine species.