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SC&D Boyett Petroleum 419 South Main Street March 18, 1999 Manteca, California Page: 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 three percent (3%) Bentonite mixture.- Borings into the saturated zone will be drilled to a maximum of 20 feet ben the top of the aquifer bein ex lored. Any perching layers en will be estied to a maximum thickness of 5 feet and will be backfilled with } [c:oncre:teslurry, after a Bentonite seal has been placed. f a deeper aquifer i n uctor casing will first be grow into place to seal off the upper aquifer(s), in series, if necessary, and drilling will proceed through the conductor casing after the grout has been allowed to set properly. If evidence of contamination is noted during the drilling, the drilling will be halted until the responsible professional determines the advisability of deeper drilling. 'Torrr rI,, C;Wq(cor Upon termination, the boring 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 at least 4 inches greater than the 2 inch diameter of the well casings to be used. The cuttings from the drilling operation will be containerized in 55 gallon drums, pending the results of laboratory data. 3.2 Well Construction All materials used in well construction will be thoroughly cleaned prior to introduction into the boring. A Bentonite or cement and Bentonite grout will be placed at the bottom of the boring as necessary. A two inch diameter well casing (stainless steel or PVC) with end cap and factory perforations for placement in the saturated zone (taking into account seasonal variation) will be placed in the boring after the seal has been allowed to set long enough to support the weight of the casing. The screen and filter pack sizes will be as noted in the well construction drawing. The casing and end caps will be thrp-nd l or ininpA by s_tninlPcc stPPl w.rew.c• nn PVC' r.PmPnt_ will ht-- im-Al Thi-. ' filter pack will extend two feet above the perforated zone. A Bentonite seal 2- to 3-feet thick will be placed in the annular space above the filter pack followed