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Ms . Laurie Cotulla <br /> June 1 , 1987 <br /> Page 2 <br /> " Research available literature to assess the <br /> regional and site specific hydrogeology and to <br /> locate water wells within a one-half mile radius of <br /> the site. <br /> " Based on the literature review and any existing field <br /> data, position and install three 2-inch diameter ground- <br /> water monitoring wells to assess the subsurface hydro- <br /> geologic and contaminant conditions . <br /> " The vertical and horizontal extent of contamination <br /> on site will be assessed using field observations <br /> and soil and water samples . <br /> " Subsurface lithology will be determined by the <br /> supervising field geologist during drilling of the <br /> monitoring wells . The drilling will be conducted <br /> using a hollow stem auger drilling rig with <br /> 7 . 5-inch O.D. (outside diameter) augers . <br /> " Soil samples will be retrieved at approximately <br /> five-foot intervals and/or points of changing <br /> lithology until the water table is encountered. <br /> The samples will be collected during drilling using <br /> a 2 . 5-inch O . D . split spoon sampler lined with <br /> three, 2x6-inch brass sample tubes . The sampler <br /> will be driven 18 inches ahead of the augers at <br /> each sample point . <br /> " Soil samples will be screened in the field using a <br /> photoionizer device ( PTD HNU 101 ) . The PID <br /> measures total ionizable compounds in vapors from <br /> the soil . Each soil sample in the split spoon <br /> adjacent to the sample saved for potential analysis <br />