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Union Ice Company <br />' Weber Avenue Site <br /> Modified Work Plan To Define Extew of Soil Contamination <br /> Page 3 <br />' The borings will be logged ur er the diiect supervision of a re-isteied <br /> engineering geologist using the Unified Soil Classificanon System The color, <br /> texture, moisture, plasticity (if applicable), consistency of she earth materials, <br />' blow counts, pertinent soil or beurock characteristics, and any evide<<ce or <br /> contamination will be noted All water-bearing zones and the depths at which <br />' they were encountered will be noted on these logs <br /> All borings will be drilled in such a manner as to prevent cross contamination <br />' between strata Exploratory soil borings within the unsaturated zone will be <br /> backfilled with a concrete slurry mixt.are <br /> Bonngs into the saturated zone will be drilled to a max.muin of 20 feet beneath <br /> the top of the aquifer being exploi ed Any perching layers encountered will be <br /> investigated to a maximum thickness of five feet (5`) and will be baLlfilled with <br /> concrete slurry, after a Bentorme seal has been placed If a deeper aquifei is to <br /> be investigated, conductor casing will fust be grouted into place to seal off the <br /> upper aquifer(s), in seines, if necessary, and drilling will proceed through the <br /> conductor casing after the grout has been allowed to set properly If evidence of <br /> contamination is noted during the drilling, the drilling will be halted until the <br /> responsible professional determines the advisability of deeper drilling <br /> Upon termination, the boring into the saturated zone will be completed as a <br /> monitoring well and backfilled with concrete grout, after a Bentenate seal has <br /> been placed The boring for the monitoring well will be of a diameter at least <br /> four inches (4") greater than the two inch (2") diameter of the well casing to be <br /> used <br /> The cuttings from the drilling operation will be conUunenzed on-site during <br /> drilling for proper dispo,,ition The proper method of disposal will be dependent <br /> upon results of laboratory analysis .Cliffs disposal will be the responsitility of <br /> the client unless other arrangements have been made <br /> 3.2 Soil Sampling <br /> P S' <br /> fAll soil sampling equipment will be thoroughly steam-cleaned before and <br /> between sampling to prevent crobs contamination Relatively undisturbed soil <br /> samples will be taken at intervals of not more than five feet (5') in order to <br /> evaluate the subsurface materials, however, this sampling interval may be <br /> waived in saturated sands in which sample recovery is not possible During the <br /> use of a rotary rig, samples will not be taken through the gravel zona but will <br /> I <br />