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COLORADO DEPARTMENT OF PUBLIC HEALTH PND ENVIRONMENT <br />WATER QUALITY CONTROL DIVISION <br />WATER QUALITY PROTECTION SECTION <br />GROUND-WATER PERMIT GUIDANCE <br />SUGGESTED MONITORING WELL SAMPLING PROTOCOL <br />B. CrROUKD-CVATER SAMPLE COLLECTLO?d <br />METHOD A FOR SAMPLE COLLECTION <br />.,. For those sample personnel using a bailer, they are to lower the bai]er slowly through wzter column until <br />the bottom of the bailer reaches the sample depth. The sample depth is indicated by a mark or adhesive <br />[ape on the cable. The bailer si~ould be raised tc the surtace 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 conainer and not 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 />bubbles. The TOC sample vial is to be inverted and gently looped on a gloved hand to check for air <br />bubbles. If a headspace is detected in the sample viah discard the sample and then re511. <br />g Store szmples under icce in an ice chest pending d_iivery ro the Iabe.-ator:. <br />_. nslE T~'OD B FOR SAMPLE COL! ECTION <br />This method describes procedures to be performed when the monitoring well(s) are low yielding. A low <br />yielding well is one that is capable of rechargtrg within t}tree hours. Tms sampling procedure is applicable <br />for both pumps and bailers and includes the following: <br />a. Prior to purginJsampiing, calibra[e al] test eeuipment used in the field according to manufacture's <br />specifications. Enter all eauiomeat calibration data into a field logbook. Clean al] field test eeuipment <br />and ground-ware: sampling equipment. <br />b. Purge the contents of the well into a container to determine the pH, temperature and conductivity of the <br />water u4at has seeped into the well. <br />c. Purge the well until it is d^±. <br />d Because recharge takes three hours or less, take another throw away sample to detetmine temperature, pH <br />and conductivity. Record these values. Once the well has recharged, collect samples in the order <br />indicated in the permit in the oaragranh for the compliance schedule addressing the sampling pro[ocol <br />{typically, Part 1A.6. (d)(F) or LA]. (c)(Fj}. <br />e. A`te: the last ground-water sample is taken, again take a throwaway sample to de:e ,mine the pH, <br />temperature and conductivity. Record these values and compare to L`te other rvo sets of values. <br />