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- <br /> ^ ` <br /> Protocol <br /> Page: 4 <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, <br /> cables, and glove worn by sampling personnel, will be <br /> disassembled if appropriate and steam cleaned prior to <br /> commencement of sampling. These procedures will also be <br /> followed between each well or sampling point and at the end <br /> of the sampling day. De-ionized or organic-free water will <br /> then be introduced into the pump or bailer as the last stages <br /> 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 which <br /> does not introduce air into the water column, or a Teflon <br /> bailer. At least three well volumes will be evacuated from <br /> 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. <br /> Wells that are dewatered before the evacuation of three <br /> well volumes has been accomplished will be sampled upon 80 <br /> percent recovery of the initial water level, or upon <br /> stabilization of the water level. The wells or other <br />