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r <br /> CLEARWATER <br /> G R O U P, I C. <br /> CLEARWATER FIELD ROCEDURES <br /> Well Installation, Soil Sampling, ell Development and <br /> Groundwater Sadipling <br /> Drilling and Soil Sampling . <br /> - Prior t d <br /> o drilling, Clearwater Group, Inca(CG ) will obtain all necessarypermits . <br /> and. also . locate all _underground and ove ground utilities through i <br /> I Underground Service Alert (USA) and ihor ugh 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-mo ted hollow-stem auger drill rig, <br /> unless site conditions warrant a different rilling method.. All down-hole <br /> drilling equipment will be steam cleaned p 'or to arriving on-site, to prevent <br /> the introduction of contaminants from off-E ite. 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 /> i< 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 obviou 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 minim .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 /> r Soil removed from the top two liners will e used for lithologic descriptions <br /> (according to the unified soil classifications stem) 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 ' the bag will be tested for total <br /> CLEA.RWA=GROUP,INC. June 2,1993 <br /> . rp <br /> r <br />