Laserfiche WebLink
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT <br />WATER QUALITY CONTROL DIVISION <br />WATER QUALITY PROTECTION SECTION <br />GROUND-W?.TER PERMIT GUIDANCE <br />SUGGESTED MONITORING WELL SAMPLING PROTOCOL <br />S. GROIIND-WATER SAMPLE COLLECTION <br />6. FIELD SAMPLE COLLECTION AND TESTING <br />is greater than 11 and sodium concentration is more than 10 moles per liter. Measurement of pH is <br />temperature is temperature sensitive, so the standard buffers should be within +/- 1°C of the sample solution <br />for precise determinations. Calibrate the.equipment in strict accordance with the manufacturer's instructions. <br />If the sampling continues from one day to the next, the pH held testing equipment is to be calibrated each day <br />_ __ _ _-0€ it fxse. der ..?-lacs€fe€~eln€io~ is~be determined based-upon iatswlgdg~ crf ~~d water ffi the <br />azea. Typically the ground water is going to be azound 7.0 s.u. The buffer solutions of 7.00 and 10.0 are to <br />be used.to calibrate the pH equipment. The pH is to be recorded to the nearest hundredth. Ensure that the <br />buffer solutions are stored properly and acproximately at the temperture o:` the ground water. Ii the <br />temperature of the ground water is not known, then a temperature neaz 45 °F would suffice. It is suggested <br />that two probes be available for use. The probe in use should be kept wet in deionized water or according to <br />the manufacturer's instructions. <br />Specific Conductance <br />Specific conductance is to be measured for each monitoring well during the purging process. The meter is to <br />be calibrated in strict adherence to the manufacturer's instructions. The meter is to be calibrated on each day <br />that sampling is to occur. Calibration is made by using the 0.00702 N standard solution at the ambient <br />temperature. The [emperature control is set at 25°C, and the ambient temperature of the siandazd KCl <br />solution is recorded. A value of specific conductance is obtained and compazed with values given in a graph <br />of Specific conductance at 25°C and specific conductance of a 0.00702 N KCI solution at various <br />temperatures. The meter is to be within five (5) percent of the graph. Specific conductance meters used in <br />the field should be battery operated, equipped with temperature compensator and read directly in <br />micromhos/cm at 25 °C. The direct readin, meter is recommended to save time in converting resistance <br />..values-taspec-ifie~eeduceanee $c:d -ta-ir~sme arat ;,cvalue is7ead urthe~elt~-- - - <br />Temperature <br />Measurement of ground-water temperature is most accurate when the ambient temperature is within 20°C of <br />the ground-water temperature. New or little-used wells may develop new produc•:ng zones during pumping, <br />thereby varying the proportion of water entering the well from different depths and causing either an <br />ins`antaneous chan,e or continual drifr in the temperature measurements. Drawdown may czuse <br />