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Ryegrass Limited Purpose Landfill and Balefill Closed landfill <br />Cmandwater and Leachate Sampling and Analysis Plan <br />KJttitas Gnunly Sulid weglr <br />?.F7.4 Laboratory <br />Laboratory QA/QC samples may consist of the following, depending on the analysis: <br />■ Method blanks <br />■ Duplicates <br />■ Instrument calibration verification standards <br />■ Laboratory control samples <br />■ Surrogate spiked samples <br />■ Performance evaluation QC check samples <br />Specific procedures and frequencies for laboratory QC are detailed by analytical method in the <br />laboratory QA Plan. A general description of the types of required laboratory QC samples is provided <br />in the following sections. <br />2.6.2.1, Method Blank <br />A minimum of one method blank will be analyzed per 20 samples or one per batch (whichever is <br />greater) to assess possible laboratory contamination. Method blanks will contain all reagents and <br />undergo all procedural steps used for analysis. <br />2.3., Laboratory Control Sample <br />A minimum of one laboratory control sample (LCS) will be analyzed per 20 samples or one per <br />sampling event (whichever is greater) to verify precision of laboratory equipment The LCS will be a <br />concentration within the calibration range at a different concentration than the standards used to <br />establish the calibration curve. LCS analysis will follow EPA LCS guidelines established in SW-846 <br />(EPA 2018). <br />A minimum of one matrix spike (MS) will be analyzed per 20 samples or one per sampling event <br />(whichever is greater) to monitor recoverles and to assure that extraction and concentration levels <br />are acceptable. The MS will be analyzed on a separate water sample collected at a well. The matrix <br />spike will follow the matrix spike guidelines specified in EPA's Contract Laboratory Program <br />statements of work (EPA 2004, 2005). <br />t=;.2-.' Matrix Spike Duplicate <br />A minit11un1 of one matrix spike duplicate (MSD} per 20 samples will he analyzed far VOCs, or one per <br />sampling event (whichever is greater) to provide information on the precision of chemical analysis. <br />The MSD will be analyzed on a separate water sample collected at the same sampling station from <br />which the MD is collected, MSDs (rather than matrix duplicates) are analyzed for VOCs, because of <br />the large number of undetected compounds. Comparing the MS and MSD provides better <br />information on the quality of the data. The MSD will follow EPA MSD guidelines specified in SW•846 <br />(EPA 2018). <br />April 2024 1550-1768.010 <br />Revlsed May 2024 <br />