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f. If the laboratory- reported analyte concentration results do not indicate that retort- <br />derived contaminants may have migrated to the well, then daily downloading of <br />pressure data and weekly sampling of suspect wells will continue. Weekly <br />sampling of the suspect well(s) will continue until either pressure heads become <br />consistent with background trends or the pilot retort test is completed, whichever <br />occurs first. Retort- derived contamination may not be indicated where the <br />reported analyte concentration(s) meet all of the following criteria: <br />g. <br />Groundwater & Surface -Water Monitoring Response Plan <br />temperature, oxidation- reduction potential [ORP], dissolved oxygen, and <br />turbidity) will be recorded for each sample. <br />i. Correspond with baseline trends, regional trends, and /or analyte <br />concentrations upgradient of the pilot retort; and <br />ii. Do not exceed the maximum baseline concentration by more than the <br />accuracy reported by the laboratory; and <br />iii. Do not exceed the mean baseline concentration for the well by more <br />than two standard deviations. <br />If the weekly water- chemistry results indicate that retort- derived contaminants <br />may have migrated to the well, a second sample will immediately be collected to <br />confirm the initial result. Retort- derived contamination may be indicated where <br />the reported analyte concentration(s) meet all of the following criteria: <br />i. Do not correspond with baseline trends, regional trends, and /or analyte <br />concentrations upgradient of the pilot retort; and <br />ii. Exceed the maximum baseline concentration by more than the accuracy <br />reported by the laboratory; and <br />iii. Exceed the mean baseline concentration for the well by more than two <br />standard deviations. <br />h. If the second sample(s) do not confirm the initial results and do not indicate that <br />retort- derived contamination may have migrated to the well, then daily <br />downloading of pressure data and weekly sampling of suspect wells will <br />continue. Weekly sampling of the suspect well(s) will continue until either <br />pressure heads become consistent with background trends or the pilot retort test <br />is completed, whichever occurs first. <br />i. If the second sample(s) confirms the initial result, pilot retort test heating will be <br />shut down, pressures will be reduced in a rapid safe manner, and groundwater <br />samples will be collected from all wells to begin groundwater protection <br />procedures (see Section 3.0 of this plan). Heating operations may resume after <br />the problem has been corrected. <br />3 <br />