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0/LDC INSPECTION -2- 7 June 1990 <br /> analyzing for nickel and zinc in the soil remaining in the impoundment. He didn't <br /> think there would be a problem with discharging the water into the sewer. <br /> I asked Mr. Pletcher to send us the lab results for the samples when he received them. <br /> When Mr. Schafer left the site, the monitoring well sampling continued. Each of the <br /> remaining wells was sampled in the same manner: The depth to water was measured and <br /> the casing volumes calculated. Each well was purged (with a Well Wizard dedicated pump <br /> system) a minimum of three well volumes and until pH, EC, and TDS stabilized. After <br /> purging, a 0.45 micron filter was attached to the discharge line. The samples were <br /> then collected in plastic bottles. The samples collected for metals analysis contained <br /> HNO, as a preservative. I collected split samples from monitoring wells MW-1 , MW-2, <br /> MW-3, and MW-5 for separate analysis. <br /> The water from monitoring well MW-2 was very cloudy and contained a lot of sediment. <br /> Mr. Pletcher stated that that was normal for the well . The water cleared up some while <br /> purging, but not completely. <br /> SAMPLE RESULTS <br /> The laboratory results of the samples collected by RSI are as follows: <br /> Constituent Units MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 <br /> Arsenic mg/l 0.013 0.002 0.003 0.002 0.008 0.004 <br /> Chromium (tot. ) mg/l 0.09 0.031 0.005 <0.005 0.006 <0.005 <br /> Iron mg/l <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <br /> Lead mg/l 0.005 0.007 0.005 <0.005 0.005 <0.005 <br /> Manganese mg/l <0.005 <0.005 <0.005 <0.005 <0.005 0.011 <br /> Nickel mg/l <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <br /> Vanadium mg/l <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <br /> Zinc mg/l <0.05 <0.05 <0.05 <0.05 <0.05 0. 18 <br /> Alk. Tot. (CaCO,) mg/l 220 280 180 140 160 110 <br /> PH std. 7.4 7.4 7.4 7.4 7.3 7.8 <br /> EC µmhos/cm 650 810 550 500 510 310 <br /> TDS mg/l 390 480 340 310 320 200 <br /> The laboratory results of the samples collected by the Regional Board are as follows: <br /> Constituent Units MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 <br /> Arsenic mg/1 0.012 0.002 NA 0.003 0.007 NA <br /> Chromium (tot. ) mg/l 0.082 0.030 NA 0.002 0.004 NA <br /> Nickel mg/l <0.001 <0.001 NA <0.001 <0.001 NA <br /> TDS mg/l 381 425 NA 252 306 NA <br /> NA = not analyzed <br /> Concentrations in mg/l <br /> Laboratory reports and chains of custody are attached. The results of the split <br /> samples are in good agreement. It appears both laboratories are performing well . <br />