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J. J. K KLEINFELDER &ASSOCIATES r File No. W-2005-1 December 2, 1985 Page 3 was buried at an approximate depth of 19 to 12 feet below the surface grade and is shown on Plat! 1I. Two 10,000 gallon and one 6,000 gallon fuel storage tanks were also removed from the site. The county representative present at the time of removal of the three large fuel storage tanks did not require testing the tank excavation and noted that gasoline and related constituents appeared not to be present and no samples were collected by the client or J. H. Kleinfelder BSc Associates. One soil boring, Completed as a monitoring well was placed near the 1,000 gallon tank excavation and sampled by J. H. Kleinfelder x Associates on September 23, 1985. IQ. PURPOSE - The purpose of this investigation was to assess whether the removed one 1,090 -- gallon tank was a source or benzene in the ground water beneath the tank and to determine ground water gradient and direction. Towards this end, three monitoring - :wells were placed at estimated upgradient and downgradient locations specified by the ' County. During drilling, a Kleinfelder soli samples for subsequent analysis, rind oggedstheled bore1 oles.bsurface soils; collected IV. FIELD ACT171TIES/OBSERVATIONS A. Soil Borings The ;locations of the soil borings and monitc^ing wells which were installed in the �- same borings is shown on Plate Ill. The borings were drilled using a truck-mounted Mobile B-61 drill rig equipped with 8-inch t:allo*v stem auger. All drilling and sampling equipment was thoroughl., cleaned with a high pressure cleaning unit prior to use. A description of the soil encountered is presented on Plate V, with a copy of the Unified Soil Classification System (used to identify the soils) presented on PIatr> IV. The soil encountered during drilling consisted of silty sand, clayey silt and sandy clay. Ground i,.