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CLEARWATER <br /> lip G R O U P, I N C. <br />' CLEARWATER FIELD PROCEDURES <br />' Well Installation, Soil Sampling, Well Development and <br /> Groundwater Sampling <br /> I <br /> Drilling and Soil Sampling . <br />' Prior to drilling, Clearwater Group, Inca(CGI) will obtain all necessa - ermits <br /> g P n' P <br /> and also locate all underground and above ground utilities through <br />' Underground Service Alert (USA) and thorough site inspection. All drilling <br /> equipment will be inspected daily and will be maintained in safe operating <br /> condition. <br />' All borings will be drilled using a truck-mounted hollow-stem auger drill rig, _ <br /> unless site conditions warrant a different drilling method. All down-hole <br /> drilling equipment will be steam cleaned prior to arriving on-site, to prevent <br /> the introduction of contaminants from off-site. Working components of the <br /> drill rig near the borehole, as well as augers and drill rods will be thoroughly <br /> steam cleaned between each boring location. All drilling and sampling <br /> methods will be consistent with ASTM Method D-1452-80 and local, state and <br /> federal regulations. <br /> Soil samples are typically collected every 5 feet using brass tubes fitted in a. <br /> I California-modified split spoon sampler. If copper or zinc contamination is <br /> the subject of the investigation, stainless steel liners will be used instead of <br /> brass. Additional soil samples may be collected based upon significant <br /> I changes in lithology or in areas of obvious soil contamination. Tor sample <br /> collection, the split spoon sampler is driven 18 to 24 inches past the lead auger <br /> by a 140-pound hammer falling a minimum .of 30 inches. The number of <br /> blows necessary to drive the sampler and the amount of soil recovered will be <br /> recorded on the field exploratory soil boring log. The soil sampler and liners <br /> will be cleaned with an Alconox solution and rinsed with tap water prior to <br /> each sampling event. <br /> Soil removed from the top two liners will be used for lithologic descriptions <br /> (according to the unified soil classification system) and for organic vapor field <br /> analysis. Organic vapors will be analyzed in the field by placing in a plastic <br /> bag or glass jar approximately 30 grams of soil from an undisturbed soil <br /> I sample. The bag or jar will be sealed and warmed for approximately 20 <br /> minutes, then pierced. The head space in the bag will be tested for total <br /> 1 <br /> CLEARWATER GROUP,INC. June 2,1995 <br /> I <br />