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d" A <br /> t <br /> hammer of known weight and height above the sampler are allowed to free-fall onto the rod, <br /> advancing the assembly 18 inches into undisturbed soil. Clayton uses the number of blows <br /> necessary to drive the sampler hitt the ground to help evaluate the consistency of materials <br /> encountered The sampler is then pulled from the borehole and disassembled, and the three <br /> brass tubes are separated for inspection and labeling. <br /> Clayton uses new brass liners or liners cleaned with a trisodium phosphate (TSP) solution, <br /> double rinsed with clean tap water, and air dried prior to each sampling. The sampler is also <br /> cleaned with TSP and rinsed with tap water between sampling events. <br /> Sod samples selected for laboratory analysis are left in the brass liners, sealed with aluminum <br /> foil and plastic caps, taped for air tightness, labeled, and immediately placed into a pre-cooled <br /> ice chest chilled to less than VC. Labels contain the following information: sitename,date <br /> and time sampled,borehole number and depth, and the sampler's initials, The samples are <br /> transported under chain-of-custody to a state-certified laboratory. The laboratory analyzes soil <br /> samples within the prescn'bed holding time,storing theta at temperatures below 4°C at all <br /> times. <br /> Pending remits of laboratory analysis, excess haying and sampling cuttings are placed into <br /> Department of'Transportation (DOT)-approved drum.-r, labeled with the name of the site, <br /> address,and well number,and left at the site. Uncontaminated soil may be disposed of by the <br /> client. Soil found to contain levels of contaminants above local or state action levels will <br /> require that the client dispose of it in accordance with hazardous waste regulations. At the <br /> client's request;we wry assist with the disposal of contaminated sod. <br /> �VF3 T�PL'�'1`atr Yr-rar•�Ha <br /> .aeon. <br /> Boreholes v+erted to monitoring wed by plating 2-inch or flinch diameter well casing <br /> with fly`#fid its and slotted screen into the borehole. COnstruefion materials include <br /> __. lyvinyl: hlAPV <br /> -._ pochloride steel; or low carbon-steel The most suitable material fora <br /> particular installation way depend on the parameters to be monitored. dill screens and casings <br /> used are in a contaminant-free condition when plaited in the ground. No thread lubrication is <br /> rased, other than teflon tape,for connecting the casing segments. <br /> Wells extend at least 10 feet into the upper saturated zone, but do not extend through.any <br />