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<br />Mr. Bruce Humphries - 2 - May 8, 1985 <br />Wells GBB-1 and GBB-2 have field measured pH and conductivity values in an <br />extremely alkaline and saline range. The annual laboratory analyses do not <br />fuily explain this condition except that these wells have unusually high <br />levels of potassium (greater than 40 mg/1) and no bicarbonate. In the future, <br />these wells should have carbonate content added for analysis in the lab due to <br />the fact that bicarbonate is absent. The relative absence of Fe and Mg leads <br />to an assumption that precipitation is occurring. The operator needs to <br />describe, in-depth, the chemical environment of the aquifer in which these <br />wells are completed and submit any information that would aid in determining <br />the source of this atypical ground water. <br />Well GB-5, during 1984, indicates an increase in field pH from 8.15 during the <br />first quarter to 11.95 in the last quarter. Attendant with this pH increase <br />is a loss of bicarbonate. Previous data for this well does not indicate a <br />problem with elevated pH values. The Division requests that Trapper Mining <br />Inc. provide an explanation for the observed water quality variations at this <br />monitor well site. <br />Well GF-4 has a relatively high pH of greater than 9. The Division will be <br />monitoring this situation in the future for any developing trends. <br />Due to the great variability of conductivity measurements in the field and <br />TDS measurements for the lab, conductivity should be added to the laboratory <br />annual list. Also, due to the extreme values of pH measured in the field, <br />this parameter should be included in the laboratory measurements. <br />Please respond to these comments no later than June 14, 1985. If any further <br />clarification is required, please contact the Division. <br />Sincerely, <br />eph W. Oliver <br />lamation Specialist <br />JWO/ljc <br />9802E <br /> <br />