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CLEARWATER <br /> G 2 0 L, P I N C <br /> CLEARWATER FIELD PROCEDURES <br />' Well Installation, Soil Sampling, Well Development and <br /> Groundwater Sampling <br /> I I, <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 /> 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 /> Solt 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 loners 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 minimum of 30 inches The number of <br /> I 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 Inners <br /> will be cleaned with an Alconox solution and rinsed with tap water prior to <br /> Ieach sampling event <br /> Soil removed from the top two liners will be used for lnthologic descriptions <br /> I (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 /> 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 December 16,1994 <br /> I <br />