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Ground Water Sampling <br /> • <br /> 282 Laboratory QNQC Program <br /> The SAP should provide for the use of control samples, as defined in SW-846 <br />' (U S EPA, 1986) The RP should use appropriate statistical procedures to <br /> monitor and document performance and to implement an effective program to <br /> resolve testing problems(e g, instrument maintenance, operator training) Data <br /> from control samples(e g , spiked samples,duplicates and blanks) should be used <br /> as a measure of performance or as an indicator of potential sources of <br /> cross-contamination When contaminants are detected in QA/QC samples(field, <br /> trip, or lab blanks), the accompanying sample results should be appropriately <br /> flagged All sample results shall be reported unadjusted for blank results or spike <br /> recoveries All QA/QC data should be submitted to Cal/EPA with the <br /> ground-water momtonng sample results <br /> 29 Evaluation of the Quality of Ground-Water Data <br />' A ground-water sampling and analysis program produces a variety of hydrogeological, <br /> geophysical, and ground-water constituent concentration (GWCC) data This section <br /> pertains primarily to the evaluation of GWCC data The GWCC data maybe presented <br /> to the owner or operator via electronic transmittal or on reporting sheets These data then <br /> should be compiled and statistically analyzed by the RP pnor to submittal to the lead <br /> regulatory agency If data are to be transmitted electronically,the RP should discuss the <br /> procedures with the lead regulatory agency staff to ensure that all software and hardware <br /> t• being used are compatible <br /> The following guidelines should help to ensure that units of measure associated with data <br /> values are reported consistently and unambiguously <br /> v The units of measure should accompany each target analyte Laboratory data <br /> sheets that include the statement "values are reported in ppm unless otherwise <br /> noted" should generally be discouraged, and at least should be examined in detail <br /> by the technical reviewer It is common to find errors in reporting the units of <br /> measure on this type of data reporting sheet, especially when these reporting <br />' sheets have been prepared manually <br /> O The units of measure for a given target analyte should be consistent throughout the <br /> report <br /> RPs should ensure that during chemical analysis, laboratory reporting, computer <br />' automation,and report preparation, data are generated and processed to avoid mistakes, <br /> and that data are complete and fully documented Data should be reported correctly for <br /> the results to be valid <br />