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Britz Fertilizer Stockton Site 1 rerraeon <br /> Project No. 80077035 <br /> November 12, 2007 <br /> Subsurface Exploration <br /> Terracon proposes to drill 12 borings (B-1 through B-12) at the site using direct-push drilling <br /> techniques. Borings B-1 through B-8, B-11, and B-12 will be advanced to a depth of <br /> approximately 8 feet. Borings B-9 and B-10 will be advanced to approximately 12 feet. If <br /> groundwater is not encountered by 12 feet, one of the borings will be advanced to a maximum <br /> depth of 25 feet to attempt to locate groundwater. If groundwater is encountered at a depth less <br /> than 25 feet, three Hydropunch borings will also be advanced (at locations B-3, B-6, and B-11) <br /> to collect groundwater samples. If groundwater is not encountered by 25 feet, the Hydropunch <br /> borings will not be advanced. Three hand auger borings (HA-1 through HA-3) are also <br /> proposed to a depth of approximately 4 feet. The approximate boring locations are shown on <br /> the enclosed site plan. Site conditions, such as surface or underground obstructions or utilities, <br /> may require adjustment of the boring locations in the field. <br /> Soil lithology, color, relative moisture content and visual or olfactory evidence of contaminants <br /> will be documented for each boring. Soil samples will be collected from each boring at <br /> approximate depths of 1 foot, 4 feet, and/or 8 feet and 12 feet for laboratory analysis. <br /> All sampling and drilling equipment will be thoroughly cleaned by use of a non-phosphate <br /> cleaner (Alconox) followed by a potable water rinse and then deionized water rinse prior to <br /> commencement of each boring. Upon completion of sampling, the borings will be backfilled with <br /> neat cement grout to the surface. <br /> Laboratory Analytical Program <br /> The soil samples will be analyzed for the Minnesota Department of Agriculture (MDA) List 1 <br /> NEP Screen; organochlorine pesticides (EPA 8081); nitrate/nitrite nitrogen; ammonia nitrogen; <br /> and/or TPHg and TPHd (EPA 8015) based on field observations. If encountered, the <br /> groundwater samples will be analyzed for the Minnesota Department of Agriculture (MDA) List 1 <br /> NEP Screen; nitrate/nitrite nitrogen; and ammonia nitrogen. <br /> Investigation-Derived Waste <br /> All soil cuttings and decontamination rinsate will be placed in DOT-approved 55-gallon drums <br /> and stored on-site pending disposal at an appropriately permitted facility. <br /> Please contact me if you have any questions regarding this work plan. <br /> Sincerely, QRpFFSSl0� <br /> lrerracon a�°ase. K' <br /> � No. 6a49a <br /> �c Exp. 9/301 a <br /> James P. Kiernan, P.E. s CrV1 X! <br /> Environmental Department Manager lq OF C�UF�Q� <br /> 2 <br />