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COLORADO DEPARTMENT OF PUELIC HEALTH A.ND ENVIRONMENT <br />WATER QUALITY CONTROL DIVISION <br />WATER QUALITY PROTECTION SECTION <br />GROUND-WATER PERMIT GUIDANCE ___ <br />SUGGESTED MONITORING WELL SAMPLING PROTOCOL <br />B. CzROIIKD-WATER SAMPLE COLLECTFON <br />METHOD A FOR SAMPLE COLLECTION <br />... For those sample personnel using a baIler, they are to lower the bailer slowly through water column until <br />the bottom of the bailer reaches the sample depth. The sample depth is indicated by a mark or adhesive. <br />tape on the cable. The bailer should be raised to the surface and the sample transferred to sample <br />containers with minimal agitation and contact with the atmosphere. The sample should be allowed to <br />flow down the side of the receiving container and nor allowed to cascade onto the bottom of the <br />container. <br />f For TOC samples; the ground-water sample is to be poured into sample vials without introducing <br />- - -babbles.~he T(3C-s,attp4e viahisto be inverted~nnd'gentty tapped~tta'gTove3 Kand'to-c5e`c$~'dc au <br />bubbles. if a headspace is detected in the sample vial, discazd the sample and then refill. <br />g. Store samples under ice in an ice chest pending delivery to the laboratory. <br />3. 1`dETHOD B FOR SAMPLE COLLECTION <br />This method describes procedures to be performed when the monitoring well(s) aze low yielding. A low <br />yielding well is one that is capable of rechareing within three hours. This sampling procedure is applicable <br />for both pumps and bailers and includes the following: <br />a. Prior to purging/sampling, calibrate all test equipment used in the field according to manufacture's <br />specifications. Enter al] equipment calibration data into a field logbook. Clean all field test equipment <br />and ground-water sampling equipment. <br />b. Purge the contents of the well into a container to determine the pH, temperature and conductivity of the <br />water that has seeped into the well. <br />c. Purge the well until it is dry. <br />d Because recharee takes three hours or less, take another throw away sample to determine temperature, pH <br />and conductivity. Record these values. Once the well has rechazged, collect samples in the order <br />indicated in the permit in the pazagraph for the compliance schedule addressing the sampling protocol <br />{typically, Part iA.6. (d)(F) or I.A.7. (c)(F)}. <br />e. Afier the last ground-water sample is taken, again take a throwaway sample to determine the pH, <br />temperature and conductivity. Record these values and compare to the other two seta of values. <br />a <br />