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2 The following analytical determinations were performed on all samples collected for this trip: total cyanide, WAD cyanide, and total metals (calcium, copper, iron, sodium and zinc). Nitrate + nitrite was not determined on samples from this trip. Only unfiltered samples were collected at all locations. Consequently, neither the barrel filter nor the in-line filter assemblies were used for filtration of groundwater samples, and the rinse blank included only washing and rinsing of the sample collection bucket and the 600-m1 transfer beaker. 2.1 FIELD MEASUREMENTS The dissolved oxygen and pH/conductivity/temperature meters were calibrated each morning using pH 7 and 10 buffers, 1433 pS/cm conductivity standazd and an air calibration for the dissolved oxygen meter. The dissolved oxygen meter was not operating properly during this sampling trip. Measured dissolved oxygen readings were above 100% saturation for the relevant elevations, and all dissolved oxygen measurements (for RS-5, Upper Tailings Impoundment, Lower Tailings Impoundment, and the Collection Impoundment) are not considered reliable. Aback-up meter and probe would have obviated this problem with dissolved oxygen field measurements. In addition, the generator required jump starting at the shop for both days of the sampling trip. 2.2 FIELD QUALITY CONTROL SAMPLES The rinse blank (taken before collection of groundwater well sample M-13) was prepared by washing the green plastic bucket and the 600-m1 plastic beaker with soapy water, followed by a tap water rinse and finally by a DI rinse. The washing procedure was then repeated for a total of two washes/rinses. The rinse blank was taken by filling the green bucket with approximately four liters of DI, pouring the DI from the bucket into the ti00-ml plastic beaker and then into the sample bottles. The groundwater samplimg hose was decontaminated without soap during this trip because the soap is apparently difficult to completely rinse out of the sampling hose. As on the last three third-party monitoring trips, the DI water used for rinsing and field/rinse blanks was second-stage DI water from BMRI's San Luis lab (which was finashed through the final three columns of the ion-exchange system). RCG/Hagler, Bailly, Inc.