HYDRO23889 - Laserfiche WebLink

Home Browse Search

assessment. The values derive from a very clear sample and mazk maximum values that might otherwise appeaz in an analysis of dissolved constituents. For this memo, all analyses were compazed with the lower of either agriculture or drinking water standazds. Those pazameters that exceed either the agriculture or drinking water use standazd aze identified herein. All other samples maybe assumed to meet the standazds - i.e. the reported value is below the standazd. The standazds tables used for comparison are from WQCC Regulation 41, Basic standazds and Methodologies for Groundwater, and aze those posted currently at the CDPHE web site at: httaa/www.cdnhestate.co.us/op/reps/waterregs/100241.ndf A copy of these tables is attached. We elected not to analyze for any of the regulated organics (Table 1 ofRegulation 41, The Basic standazds for Groundwater) nor for asbestos, cyanide, chlorophenol, color, conosivity, foaming agents, odor, or phenol. These parameters were left out due to their unlikely presence in the raw feedstocks, process chemicals, and processing derivatives. The Division requested analysis of radioactive pazameters. However, because the sample has such high total dissolved solids (TDS), the lab was unable to measure the radioactive pazameters requested. Results: Analytical results are attached in the table of analyses from Laboratory Services Division of CDPHE Labs, Lab ID: INO-2004002572. In addition to the results, the lab sheets list MCL (Maximum Contaminant Level) and MDL (Method Detecfion Limit). The MCL is provided for guidance, and in this case is the same as the regulated value for drinking water. All of the listed MCL's are for drinking water. MDL is provided as a rough measure of what the particulaz analytical method and specific analytical instruments aze capable of providing under ideal circumstances for "clean" samples, that is, samples containing a known (spiked) quantity of a single analyte in pure water. The MDL is for guidance only; actual reportable detection limits - or the practical quantitation limits (PQL), or the limits above which a reported value can be accepted with a high level of accuracy - is always higher than the MDL, especially for samples such as the one at hand which has extremely high TDS and thereby a high potential for analytical interferences. Qualifiers: Lab qualifiers are listed for Nitrite-N and pH. Lab personnel provided sepazately, by phone, that Nitrite-N was flagged because of the high uncertainty due to exceedance of holding time. The reported value represents the minimum nitrite content that might be present Lab pH was flagged due to uncertainty of instrumentation at such a high pH. Accuracy at this level is lower than normal, which would be +/- 0.01 standazd units. The measured pH is near the detection limits of the instnunent. 3