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The following analytical determinations were performed on all samples collected for this trip: <br />total cyanide, WAD cyanide, calcium, copper, iron, sodium and zinc. Nitrate + nitrite was <br />not determined on samples from this trip. The unfltered-filtered comparisons were agreed <br />to be conducted for only two sampling trips (the second and third third-party monitoring <br />visits). Therefore, only unfiltered samples were collected at all locations. Consequently, <br />neither the barrel filter nor the in-line filter assemblies were used for filtration of <br />groundwater samples. <br />2.1 FIELD MEASUREMENTS <br />The dissolved oxygen and pI-I/conductivity/temperature meters were calibrated each morning <br />using pH 7 and 10 buffers, 1433 µS/cm conductivity standard and an air calibration for the <br />dissolved oxygen meter. All meters operated satisfactorily during this trip. <br />2.2 FIELD QUALITY CONTROL SAMPLES <br />The rinse blank (taken before collection of groundwater well M-13) was iprepared by <br />washing the green plastic bucket and the 600-m1 plastic beaker with soapy water, followed <br />by a tap water rinse and finally by a DI rinse. The washing procedure was thhen repeated <br />for a total of two washes/rinses. The rinse blank was taken by filling the green bucket with <br />approximately four liters of DI, pouring the DI from the bucket into the 6b0-ml plastic <br />beaker and then into the sample bottles. <br />As on the last two third-party monitoring trips, the DI water used for rinsing and field/rinse <br />blanks was second-stage DI water (which was finished through the final three columns of the <br />ion-exchange system). <br />2.3 SAMPLE PRESERVATION <br />As discussed above, all samples were unfiltered. Unfiltered groundwater samples were taken <br />so that metals and cyanide samples were comparable, instead of taking filtered metals <br />samples and unfiltered cyanide samples. All samples were checked after collection to ensure <br />that they were preserved to the proper pH. Cyanide samples were preserved with solid <br />NaOH to pH >_72, and metals samples were preserved with nitric acid to pH Q. <br />RCG/Hagler, Bailly, inc. <br />