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SECTION 2 <br /> SOIL AND GROUNDWATER <br /> IIVVEsTIGATION WORKPLAN <br /> Thioposed work for further evaluation of sail <br /> andsgroundw tesection lr condines itions ns of the former underground storage tank <br /> site. <br /> Scope of Work <br /> The groundwater flow direction under the tank site was determined <br /> through water level measurements in three monitoring wells. <br /> Unfortunately, none of the wells were situated immediately <br /> downgradient of the former location of the tants. ERM-West proposes <br /> to remedy the lath of downgradient information through the <br /> construction of two additional monitoring wells. One well will be <br /> located within the perimeter of the former tank location and the <br /> second well will be located within approximately 10 feet of the tank <br /> location and hydraulically downgradient of the tank site(Figure 1-2). <br /> Monitoring Well Construction <br /> The monitoring wells will be drilled utilizing a truck-mounted drill <br /> rig equipped with hollow-stem auger. Prior to the start of each well, <br /> the augers will be cleaned and decontaminated by the use of steam. <br /> Soil samples will be collected at five-foot intervals during drilling <br /> using a split-spoon s�-npler equipped with pre-cleaned brass liners. <br /> The sampler will be cleaned prior to each use in an A.lcone so beton <br /> and clean water rinse. The maximum depth of each boring <br /> willfeet. Samples will be visually classified in the field according to the <br /> Unified Soil Classification System. an organic vapor meter -,vili be <br /> used to screen a portion of the sampled material through head space <br /> measurements. Sample descriptions, head space measurements, <br /> observations, etc., will be recorded along with the depth interval of <br /> the sample on a logging form. <br /> .. ...--. ...-- .-.- ......... -... .---- . - ...- Soil.samples-retained..in brass tubes will be secured by covering the <br /> _ ends of the tubes with Teflon film and plastic caps.-- Samples Will <br /> then be labeled. The label will contain a unique sample number, the <br /> __ 2-1 <br />