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Owl' <br /> Eckert Cold Storage Company <br /> 757 Moffat Blvd., Manteca, California September 26, 1994 <br /> Underground Tank Investigation Page: 2 <br /> 3.0 Scope of Work <br /> Wi ­hd—ee ­i I- I i — I S <br /> propo,�estpcompi�[� t <br /> ­­_ 4— &rmi �tb n'd--analysis-of <br /> I.casing. -Tn-e' three.I monitonng-well.s-will-AI16W-Tor�`gradi Fnf-dbt n i n- <br /> d <br /> rVhe-und_erlying-groundwaf&Y The wells are estimated to be approximately forty foot in <br /> depth with five foot of well screen above the static water elevation, and twenty foot below <br /> the water elevation to allow for groundwater fluctuation. Actual well depth termination <br /> will be identified by the geologist at the time of the actual drilling (Figure 5). Only one <br /> monitoring well will be installed at this time to minimize interference with the plant's <br /> operations. The remaining will be scheduled at a later date. The single well installation <br /> will be in the downgradient direction (Figure 3). <br /> 3.1 Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before drilling <br /> begins. The soil boring will be accomplished using a mobile mounted drilling rig <br /> employing the use of a hollow stem flight auger no less than 3 1/4-inch Ld. and 8 7/8 <br /> o.d. <br /> ;, ie'aLng L egins:-Loy <br /> -be th6ro-�uil�-�--stm-Zl�an—ed' 6e-f6-re Mnl <br /> -"ii'ftdm-off-site-and-b6t,�v-e,�nb"o-n�n' ­ 4 <br /> :lJrvven�,the.introduction ofcontaftu"inialhogsto e IT <br /> ,,cross cornafiiifiation <br /> T5e--.b5.rin sewill­ fessional <br /> beJogged..unde- he�directsupervision.ofa-l��gi.,;-kerad-Prb'--i <br /> IND <br /> using the Unified Soil Classification System (Figure 4A), The color, texture, moistire. <br /> plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock <br /> characteristics, and any evidence of contamination will be noted. All water-bearing <br /> zones and the depths at which they were encountered will be noted on these logs <br /> (Figure 4). <br /> All borings will be drilled in such a manner as to prevent cross contamination between <br /> strata. Exploratory soil borings within the unsaturated zone will be backfilled with a <br /> cement and three percent Bentonite mixture. <br /> Borings into the saturated zone will be drilled to a maximum of twenty feet beneath the <br /> top of the aquifer being explored. Any perching layers encountered will be investigated <br /> to a maximum thickness of five feet and will be backfilled with concrete slurry, after a <br /> Bentonite sea! has been placed. If a deeper aquifer is to be investigated, conductor <br /> casing will first be grouted into place to sea] ofF the upper aquifer(s), in series, if <br /> necessary, and drilling will proceed through the conductor casing after the grout has <br /> t <br /> been allowed to set properly��ff ev.diFhce',_0-fZuntamina ion-s.nofed. <br />