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• Section No. 6 Revision No 1 Date January 13, 1992 Page 29 0£ 55 Prior to and between use, all drilling and sampling equipment will be thoroughly steam-cleaned to ensure sample integrity and to prevent cross- contamination between sampling points All borehole soil samples for chemical analyses will be collected using a modified Diedrich 3-inch O D (2 5 inch 1 D ) by 18-inch long split barrel sampler The sampler will be lined with special 6-inch long aluminum liners which become the sample containers The aluminum liners will be prepared in advance using the procedures outlined in Section 6 5 Soil samples will be collected using the following protocols ■ The hollow-stem auger will be advanced to a point immediately above the desired sample interval depth, a The modified Diedrich sampler, equipped with clean aluminum tubes, will be driven by the 140-pound cat-head hammer or hydraulically advanced into the undisturbed materials, o The Diedrich sampler will be retrieved from the borehole, dis- assembled, and the aluminum tube sleeves will be removed from the sampler, ■ The sample interval(s) to be retained for chemical analyses will be briefly inspected for lithology and then capped with teflon- lined plastic lids The lids will then be secured with adhesiveless tape (NOTE Shallow tubes will be used for sample submittal only if recovery from the deepest tube is insufficient ) , ■ Following sample collection, all sample containers will be stored, labeled, and transported to the analytical laboratory in accordance with the procedures in Sections 6 6 and 7 0, ■ Organic vapor readings of the headspace above all tubes not packaged for analysis will be measured using a Foxboro OVA, Photovac TIP, or equivalent instrument calibrated per manufacturer's instructions , if specified in the sampling and analysis plan, ■ The soil sample will be logged into the field sample control book and pertinent information recorded as described in Section 10 • 6-29