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hammer of!mown 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 sampier into 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 /> C ,vton uses new brass finers or liners cleaned with a msodium 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 /> Soil samples selected for laboratory analysis are left in the brass liners,sealed with aluminum <br /> foil and plastic raps, taped for air tightness, labeled,and immediately placed into a pre-cooled <br /> ice chest chilled to less than 40C Labels contain the following information: site name,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 prescribed holding time,storing them at temperatures below VC at all <br /> tunes. <br /> Pending results of laboratory analysis, exxss W111mg and sampling cuttings are placed into <br /> Department of Transportation(DOT)approved drums„labeled with the name of the site, <br /> address, and well number, and left at tl:- 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 will assist with the disposal of contaminated soil. <br /> Boreholes azii;w ed to monitoring wells by placing 2-mach or 4-mch diameter well casing <br /> with fl ]oho and slotted screen into the borehole. Cons&ucbon materials include <br /> polyvltiyl chloride (PVC), stainless steel, or low carbon steel. The most suitable material for a <br /> particular installation will depend on the parameters to be monitored. All screens and casings <br /> used are in a contaminant free eondrtion when placed in the ground. No thread lubrication is <br /> used, 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 />