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SAMPLING PROTOCOL <br /> Page: 3 <br /> immediately for delivery to the laboratory, and will under no <br /> circumstances be opened by anyone other than laboratory <br /> personnel. Chain of Custody records will be maintained at <br /> all times. <br /> Samples will be analyzed by a laboratory specifically <br /> certified by the California Department of Health Services to <br /> perform the analysis requested. Samples will not be tested <br /> after their sample life has been exceeded according to EPA <br /> guidelines, and will be properly disposed of after analysis. <br /> SOIL SAMPLING <br /> All soil sampling equipment will be thoroughly steam- <br /> cleaned before sampling and between sampling to prevent <br /> cross-contamination. Relatively undisturbed soil samples <br /> will be taken at intervals of not more than five feet in <br /> order to evaluate the subsurface materials; however, this <br /> sampling interval may be waived in saturated sands or gravels <br /> in which sample recovery is not possible. <br /> The soil samples will be collected using a California <br /> Modified split-spoon sampler with brass liners. The sampler <br /> will be driven by a 140 pound hammer repeatedly falling 30 <br /> inches (ASTM Standard 1586) . <br /> The laboratory samples will not have head space and will <br /> be immediately sealed in their liners using aluminum foil <br /> lined plastic caps that are taped in place. The remaining <br /> sample will be removed from its liner to be used for sieve <br /> analysis, if appropriate, and to aid the on-site geologist in <br /> logging the material. <br /> GROUNDWATER SAMPLING <br /> All sampling equipment, including the pump, bailer and <br /> cables will be disassembled if appropriate and steam cleaned <br /> prior to commencement of sampling. These procedures will <br /> also be followed between each well or sampling point and at <br /> the end of the sampling day. De-ionized or organic-free <br /> water will then be introduced into the pump or bailer as the <br /> last stages of cleaning prior to the taking of each sample. <br /> Immediately prior to sampling, water levels and well <br /> depth measurements will be taken in all wells at the site. <br /> Each well will be evacuated using a Teflon bladder pump or a <br /> Teflon bailer. At least three well volumes will be evacuated <br /> from the wells. Parameters of the water condition will be <br /> measured and logged during the evacuation. These parameters <br /> shall include temperature, conductivity and pH. Samples will <br /> be collected only after at least three well volumes have been <br /> removed and the measured parameters have stabilized. <br />