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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT <br />W ATER QUALITY CONTROL Dl V 1S lON <br />WATER QUALITY PROTECTION SECTION <br />GROUND-W'A T ER PERMI? GUIDANCE <br />SUGGESTED MONITORING WELL SAMPLING PROTOCOL <br />B. CRO~ITD-WATER SAHILPLE COLLF,CTIOR <br />4. METHOD C FOR SAMPLE COLLECTION <br />This method describes procedures to be performed when the monitoring well(s) aze very low yielaing. A <br />"very low yielding" well is one whose time of rechazge for sampling is greater than three hours and less than <br />24 hours. This sampling procedure is applicable for both pumps and bailers and includes the following: <br />a. Prior to purging/sampling, calibrate all tes[ equipment.used in the field according to manufacture's <br />specifications. Enter all equipment calibra[ion data into a field logbook Clean all field test equipment <br />and giound-water sampling equipment. <br />b. Pump/bail the water into sample containers. From one of the sample containers detetnrine the <br />aad^^^''..^«..:^. '. _ eollectsazn-°lesirrthe~ordermdicatedmthe <br />~g,1~- ~.~~:#rthe-weft.`±~,rc~-mss; <br />permit in the paragraph for the compliance schedule addressing the sampling protocol {typically, Part <br />1.A.6. (d)(F)}. <br />5. SAMPLE COLLECTION BOTTLES. HOLDING TIMES AND QUANTITY OF SA~VIPLE <br />The Water Quality Control Division has recommended procedures for samping and delivery to a certified <br />laboratory. Table 1, below, lists the proper sampling procedures, sample volumes, type of sample container, <br />preservation and holding time foe a valid sampie. This table is summary of Division guidance found in the <br />"References" in the permit Rationale. <br /> FIELD CONTAINER VOL. REQ. PRESERVATION HOLDING <br /> FILTERED MILLILITERS TIME <br /> (MINIMUM) <br />TOTAL POLYPROPYLENE, <br />COLIFOR,VI NO GLASS 200 COOL TO 4° C 6 HOURS <br /> STERILIZED <br />CHLORIDE YES PLASTIC, <br /> GLASS 50 NONE RE UIRED 28 DAYS <br /> <br /> GLASS 100 COOL TO 4° C 28 DAYS <br />NITRATE + YES PLASTIC, <br />NITRITE GLASS 200 COOL TO 4° C 24 HOURS <br /> ADD H,SO, H Q <br /> <br />