Ground Water Monitoring Activities Arkansas River Valley Alluvial Aquifer 94-95

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Duplicate spiked samples as described above. Ground water samples were protected from undue exposure to light during handling, storage, and transport. Samples were stored on ice to prevent temperature extremes and transported to the CDA, or CSU laboratory and analyzed within the recommended holding periods. Documentation of actual sample storage and treatment were handled as part of the chain of custody procedures. DECONTAMINATION PROCEDURES Wells were sampled to minimiz the potential for cross contamination. Decontamination procedures were adhered to between each sampling event. All common sampling equipment was decontaminated prior to and between all sampling events by washing with a nonphosphate detergent and triple rinsing with deionized water. Since pesticides were the constituents of most concern due to the low levels detectable, no sampling equipment was common between wells for the pesticide sampling. CONTROL OF CONTAMINATED MATERIALS The sampling team disposed of all wastes produced during the investigation in accordance with Federal and State regulations. Disposable sampling equipment was bagged, removed from the site, and disposed of as a nonhazardous material. LABORATORY ANALYSES All water samples were analyzed for selected pesticides currently used in the area, basic inorganic minerals including nitrate, and dissolved metals. Table 3 provides a listing of the laboratories used, the chemicals analyzed by each, and their detection limits. All collected samples (classified as environmental samples) were transported to the designated laboratory as medium hazard and analyzed accordingly. EPA analytical methods for each parameter group were as follows: pesticides solid phase extraction: GC/MSD metals ICP / GFAA 1 inorganics varies with analyte r_ 0300 3. Spikes Up to five pesticide spiked samples were submitted to the organic laboratories for lab QA/QC. These spiked samples were prepared in duplicate in accordance with instructions provided by the manufacture of the spiking kits. 4. Duplicate Spikes Duplicate spiked samples as described above. Ground water samples were protected from undue exposure to light during handling, storage, and transport. Samples were stored on ice to prevent temperature extremes and transported to the CDA, or CSU laboratory and analyzed within the recommended holding periods. Documentation of actual sample storage and treatment were handled as part of the chain of custody procedures. DECONTAMINATION PROCEDURES Wells were sampled to minimiz the potential for cross contamination. Decontamination procedures were adhered to between each sampling event. All common sampling equipment was decontaminated prior to and between all sampling events by washing with a nonphosphate detergent and triple rinsing with deionized water. Since pesticides were the constituents of most concern due to the low levels detectable, no sampling equipment was common between wells for the pesticide sampling. CONTROL OF CONTAMINATED MATERIALS The sampling team disposed of all wastes produced during the investigation in accordance with Federal and State regulations. Disposable sampling equipment was bagged, removed from the site, and disposed of as a nonhazardous material. LABORATORY ANALYSES All water samples were analyzed for selected pesticides currently used in the area, basic inorganic minerals including nitrate, and dissolved metals. Table 3 provides a listing of the laboratories used, the chemicals analyzed by each, and their detection limits. All collected samples (classified as environmental samples) were transported to the designated laboratory as medium hazard and analyzed accordingly. EPA analytical methods for each parameter group were as follows: pesticides solid phase extraction: GC/MSD metals ICP / GFAA 1 inorganics varies with analyte r_