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ZRI s "'.. v 1 -< ,@ a '" Em- Mamay 4 5 WI' ST ER :N GF 0LOGIC p r• .SoL: itcl: s , I .Nc: , L.Marinaro/13 Apr 1957 4 A. Boring logs are included in Attachment B. The stratigraphy varied somewhat between boreholes. clayey sift was z observed to about 4 ft below grade in all borings except for boring B-5 where clayey silt was observed to about 7 ft. In borings B-1, B-2, and B-3 low to moderate estimated permeability silty sand and sandy silt was encountered between about 4 ft and 24 ft. These units were underlain by moderate to high-estimated permeability sand to between 28 ft and 33.5 ft below grade.In boring B-4 high-estimated permeability sand was observed from 8 to 15.5 ft below grade which was underlain by a low-estimated Permeability clayey silt to 24 ft. This unit was underlain by silty sand to 30 ft and silty clay to 34 ft. Boring B-5 consisted of sand from 8 ft to 24 ft which was underlain by silty clay to 26.5 ft. Strong hydrocarbon odors were noted in cuttings from between 4 ft and 34 ft in boring 6-1 and between 3 ft and 25 ft in boring B-5. Slight hydrocarbon odors were noted in cuttings from between 15 ft and 32 ft in boring B-2. First water was encountered during drilling in borings B-1, B-2 and B-5 between 19 ft and 20 ft.' First water was observed in boring B-3 and B-4 at 22.5 ft and 24 ft, respectively. . MONITORING WELL INSTALLATION -AND DEVELOPMENT The WGR standard operating procedure for monitoring well installation and development is included as Attachment C. Borings B-I through B-5 were completed as 4-in diameter, initoring wells MW-I through _ wi-5, respectively. Well construction details are included on the logs for borings B-I through B-5 in Attachment B. Wells MW-1 and MW-5 were screened from 8 ft below grade to 32 ft and 24.5 ft, respectively. Wells MW-2 through MW-4 were screened from between 16 ft and 17 ft to between 20 ft and 24 ft. The screen was terminated at the top of the confining layer below the first water-bearing zone. Screens were brought up higher in monitoring wells MW-1 and MW-5 to capture any free product that might be present. Monitoring wells MW-i through MW-5 were developed on 20 and 21 March 1989 by WGR environmental technicians Beverly Baldwin and Mark Frye until relatively clear, sand-free water was produced.; Development was performed using a combination of airlift, air surge, and surge block techniques. Wells MW-I, MW-3 and MW-5 produced up to 3 gallons-per-minute (gpm). Well MW-2 produced up to about 6.5 gpm and well MW-4 produced up' to about 2 5 gpm. A total of 595 gallons were purged and stored temporarily onsite in 55-gallon drums pending analytic results. L 3i �� I04;1ma9 j-