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Jim Tjosvold Page 8 July 3 , 1987 understand that wells have been purged until electrical conductivity and pH stabilize and at least five well volumes are discharged. As discussed, using an inflatable bladder or packer system, which in some instances has advantages, is also acceptable. More specific definitions for "stabilize" and "reproducible" with respect to groundwater measurements are necessary. Sample equipment must not be cleaned with any phosphate (TSP) solutions because of possible contaminants from the detergent. Only non-phosphate detergents (such as Alconox) are acceptable. Quality Assurance 46. Trip blanks for analysis by EPA methods 601 and 602 must be included in each shipment container if samples from different wells are shipped in the same container. 47 . Field duplicate samples for all analyses are required at a frequency of 100, or 1 each day, whichever is greater. 48 . A final rinse for soil sampling equipment should be collected for the days activities. A sample of this rinse water should be submitted for the regular scan analysis each day. 49 . A description of quality assurance must be made for monitoring the storage temperature for samples collected in the field. It would be acceptable for the receiving laboratory to indicate on the chain of custody form that samples were received at proper or improper temperature. 50 . Although wet ice is preferable for cooling down samples because of a higher contact surface, the ice creates problems as it melts. It loses the ability to be a packing material and increases possible breakage. Also the water can remove the label or printing from the label . Therefore, it is a recommended procedure to use the wet ice for cooling and then to repack in blue ice for shipment. 51. All sample bottles for organic analysis should have a teflon liner inside the bottle cap. 52 . Missing or incorrect information for liquid samples is as follows: Amber containers should be used for samples analyzed by methods EPA 607, GC/FID, and CPAR.