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MGeological Technics Inc Page 3 I Ripon Milling Inc Report-Groundwater Inveshgation ie Project No 253 2 July 31, 1995 I ionization detector that uses a 10 0 eV lamp to detect compounds with ionization potential below 10 0 eV (hydrocarbon range) The OVM was unable to be successfully calibrated and therefore was not used MW-1 was constructed using 4 0 inch diameter PVC casing with flush threads The 0 020" screened interval extends from 22 feet to 42 feet below ground surface The water table occurs at approximately 26 feet below the surface A #3 sand filter pack I surrounds and extends two feet above the screened interval A granular bentonite transition seal was installed and hydrated A surface seal was achieved by pumping a neat cement grout (augmented with < 4% bentonite) via a tremae tube The well was secured with a locking watertight cap encased in flush mounted traffic rated well box I After the well sealing materials had set (for a period greater than 24 hours), the well was developed (using mechanical surging and pumping methods) until a clear stream of water was obtained All development water was containerized in 55 ' gallon DOT approved containers and stored on site . 1.2 Groundwater Sampling Procedure IOn March 13 and June 15, 1995 the groundwater in MW-1 was purged and sampled The following is the procedure used for the sampling of groundwater from MW-1 I Before sampling was attempted the well was sounded for depth to water and then a P g P P I clear disposable bailer was used to determine if floating product is present The well was purged of at least 3 well volumes of stagnant water using a submersible pump All water purged from the well and not used as a sample, was placed in a 55 gallon IDOT approved container, properly labeled, and stored on site Purging continued until the temperature, conductivity, and pH of the groundwater had stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions is entering the well These water quality parameters were measured at intervals of each casing volume purged and are summarized below I