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s <br /> If soil samples collected from the capillary fringe of the water table <br /> are found to contain diesel or gasoline constituents, then <br /> groundwater samples will be collected down gradient of the <br /> excavation using a modified hydropunch. The hydropunch method <br /> allows the sampling of groundwater without the necessity of well <br /> installation. The modified hydropunch employs a probe made of 2" <br /> steel pipe equipped with a detachable penetration cone. The probe is <br /> driven into the formation material in advance of hollow stem augers. <br /> The probe is then retracted from the detachable penetration cane to <br /> expose a screen in the potential water bearing zone. Water samples <br /> are collected with a stainless steel bailer which is introduced into the <br /> probe. Exact locations for collection of groundwater samples with the <br /> hydropunch will be made in the field based on results of analyses of <br /> soil samples. Hydropunch samples will permit a better <br /> understanding of the nature and extent of chemicals in the shallow <br /> groundwater prior to the installation of monitoring or extraction <br /> rm wells. <br /> Water samples obtained with the stainless steel bailer will be <br /> immediately transferred to clean volatile organic analysis (VOA) <br /> vials, filling each completely. Care will be taken to minimize any <br /> agitation of the water sample. Each sample vial will be then capped <br /> with a Teflon septum cap such that zero headspace is achieved, and <br /> no air bubbles are visible when inverted. <br /> Groundwater for TPH analysis will be collected using the bailer and <br /> `. transferred into a 1-liter amber glass container. All the containers <br /> �. (VOA vials and 1-liter amber glass)used will be labeled with the well <br /> number, date, time, sampler's initials, location, and analysis <br /> required, and chilled in a cooler. Each sample will be logged on <br /> chain-of-custody forms and in a field book. <br /> The samples will be held in the cooler, accompanied by the <br /> appropriate chain-of-custody forms. <br /> S=WeAnaLYda <br /> Soil samples will be analyzed for TPI'!-Diesel and Gasoline by EPA <br /> Method 8015 modified and BTX&E by EPA Method 8020. Soil samples <br /> - to be analyzed-.for Z'PH_will-be_-prepared_by-EPA_Method-3550-using- -------------=----- --=-- <br /> -- --- —-- sonication. Soil samples to be analyzed for BTX&E will be prepared <br /> using EPA Method 5030 (purge and trap). Total Petroleum <br /> - hydrocarbons in soil samples will be analyzed and characterized by <br /> Gas Chromatography/Flame Ionization Detection (GCFID) with a <br /> fused capillary column. <br /> 2-5 <br />