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CLEARWAtER <br /> G. R O U P, I N C. <br /> CLEARWATER FIELD PROCEDURES <br /> Well Installation, Soil Sampling, Well Development and <br /> Groundwater Saxrfipling <br /> Drilling .and Soil Sampling <br /> 'Prior to drilling, Clearwater Group, Inc. (CGI) will obtain all necessary permits <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 /> r- condition. <br /> All borings will be drilled using a truckmounted 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.ori-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 /> 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 /> changes in lithology or in areas of obvious soil contamination. . For 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 minunum. 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 /> g P <br /> analysis. Organic vapors will be analyzed in the field by placing in a plastic <br /> bag or glass jar approximately. 30 grazes of soil from an undisturbed soil <br /> sample. The bag or jar will be sealed ankd warmed for approximately 20 <br /> minutes, then pierced. The head space in the bag will be tested for total <br /> CLEARWATER GROUP,INC. April 2$, 1995 <br />