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Rally's Stockton Work Plan 12 Project No. 91349.A SOP 8 One trip blank per day of sampling, or per every 10 water samples, shall be prepared prior to the sampling event in a 40-ml EPA vial properly filled with deionized water. (See SOP 10.) The trip blank is kept in the same cooler with the samples gathered during the day. They are then packaged for shipment with the other samples and sent for analysis. However, the trip blank should not be analyzed unless contamination is detected in any of the samples. Indicate on the C.O.C. that the trip blank is a conditional sample by marking "hold" in the appropriate comment section. SOP 9 Use clean sampling equipment. If using disposable bailers, use separate bailers for development and for sampling of each well, and inspect the packaging to insure that seals have not been broken. If using a non-disposable bailer, scrub with soap and water, then with hydrogen peroxide followed by a thorough rinse. Complete with a distilled water rinse. This procedure is valid for volatile organic analysis only. For extractable organics (for example, pesticides or base neutrals for EPA method 625) a final rinse with pesticide grade isopropyl alcohol, followed by overnight drying, will be necessary. The sample equipment washing procedure is also carried out on-site before sampling monitoring wells in cases where more than one monitoring well on the site is to be sampled. SOP 10 The sampling equipment used shall consist of disposable teflon bailers or a teflon dipper. Glass vials with teflon lids should be used to store the collected samples. For a basic hydrocarbon study, when EPA Method 601 and 602, and TPH analyses are to be done, the following sample containers should be filled: 4 - 40-ml EPA vials with teflon lined caps 2 - 1 -liter amber glass with teflon lined caps SOP 11 A field blank, which is obtained in the field by running deionized water through the sample collection equipment (bailer or dipper) and placing it in a 40-ml EPA vial, should also be placed in the cooler containing the samples. One field blank per day or one for every 20 samples, whichever results in fewer samples, should be included. Like the trip blanks, field blanks should only be analyzed if one or more of the samples is found to contain contaminants.