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L %MV *MO <br /> L Mr. Lloyd Gums A91701.01B <br /> January 15, 1996 Page A-2 <br /> or drager tube. The procedure for performing head space analysis are describe in a <br /> subsequent paragraph (if pertinent to this investigation). , <br /> Generally, soil samples selected for analyses typically represent those which the field <br /> screening indicated will be most likely to contain the contaminate of concern. In most <br /> Linstances the deepest two samples and/or and sample collected from just above groundwater <br /> are selected for analyses. Samples intended for chemical analyses are sealed with Teflon® <br /> L tape and plastic end caps, labeled, placed on ice, and delivered to a laboratory, along with <br /> chain-of-custody documentation. <br /> The soil boring may be completed as groundwater monitoring wells, or abandoned by <br /> grouting with a sand-cement slurry. Abandonment procedures depend upon the boring <br /> depth, depth to groundwater, project objectives, and regulatory requirements. For boring <br /> ` greater than 15 feet deep, grout is emplaced through the hollow t augerswhich will extend to within 15 feet of the bottom of the boring. If required by the local regulatory agency, <br /> grout is emplaced by pumping through a tremme pipe which extends to within 15 feet of the <br /> L bottom of the boring. The tremie pipe or augers are withdrawn from the boring in 5-foot <br /> increments as the boring fills with grout. SOPS for groundwater monitoring well installation <br /> are described in a subsequent paragraph (if pertinent to this investigation). <br /> LSoil cuttings generated during drilling are containerized in United States Department of <br /> Transportation(DOT)-approved drums,or placed on and covered with plastic sheeting,and <br /> stored on site in an area inaccessible to the general public. Typically, the stockpiled soil is <br /> 1, characterized by collecting and analyzing composite samples from the stockpile. Twining <br /> can recommend an appropriate method for disposition of the cuttings based on the <br /> analytical results. Disposal will be the responsibility of the client. <br /> A-2 Standard Omxrating Procedures for Eau_lRment Decontamination: Proper <br /> decontamination procedures reduce the potential for: cross-contamination among sample <br /> locations; and introduction of contamination from outside sources. <br /> L Before, during, and following drilling operations, drilling equipment is thoroughly cleaned <br /> using a high pressure hot water (steam) washer. <br /> Steam cleaning condensate will be containerized for later disposal. Generally, disposal will <br /> be the client's responsibility. <br /> Sampling equipment and any tools, measuring devices, or other equipment which will <br /> contact soil or any media being assessed will be washed in a low-phosphate soap and water <br /> solution, and rinsed in clean water before each use. The type of soap used will depend <br /> upon project requirements. <br /> L <br /> L <br />