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Fuller Mobile Home Park 365 East Louuse Avenue,Lathrop, California September 6, 1994 Phase HAdditional Site Characterization Page. 4 I 3.l Drilling h Permits will be obtained as necessary for all wells (including borings) before drilling begins. The soil boring will be accomplished using a m&bile mounted drilling rig employing the�'use of a hollow stem flight auger no less than 3 114-inch i.d. and 8 7/8 o.d. 1�i All drilling equipment l be thoroughly steam-cleaned before drilling begins, to prevent the introductionA of contamination from off site, and between borings to prevent cross contamination. i The borings will be logg leld under the direct supervision of a registered professional ! using the Unified Soil :'Classification System (Figure 3). The color, texture, moisture, plasticity (if applicable), consistency of the earth materials; pertinent soil or bedrock characteristics and any evidence of contamination will be noted. All water bearing zones and;the depths at which they were encountered will be noted on these logs. All borings will be drilled in such a manner as to prevent cross ,contamination _ '�� between strata. Exploratory soil borings within the unsaturated, zone will be backfilled with a cement and tl-tree percent(3%) Bentonite mixture. f Borings into the saturated� zone will be drilled to a maximum of 20 feet beneath the top of the aquifer being explored. Any perching layers encountered will be investigated to a maximdiii thickness of S feet and will be backfilled:'with concrete slurry, after a Bentonite seal has been placed. If a deeper aquifer is to be investigated, conductor easing will first be grouted into place to seal off the upper iM aquifer(s), in series, if necessary, and drilling will proceed throughithe conductor casing afar the grout��has been allowed to set properly. I#' evidence of contamination is noted during the drilling, the drilling will be halted until the responsible professional determines the advisability of deeper drilling'. i! Upon termination, the 11oring into the saturated zone will be completed as a monitoring well and backfilled with concrete grout, after a Bentonite seal has been placed. The boring for the monitoring well will be of a diameter atlleast 4 inches greater than the 2 inch diameter of the well casing to be used. The cuttings from the drilling operation will be containerized on-site during drilling for proper disposition. he proper method of disposal will be dependent upon results of laboratory analysis. This disposal will be the responsibility of the client unless other arrangements have been made. ;�