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a <br /> Oil <br /> WIN <br />.F F <br /> initials, and date of collection. The soil sample <br /> is kept on ice prior to and during transport to a <br /> state-certified laboratory for analysis. <br /> Soil immediately adjacent to that selected for <br /> laboratory analysis will be field tested for <br /> hydrocarbon concentrations using a Gastech Model <br /> 1238 combustible gas indicator (CGI) , The CGI <br /> reading will be taken after approximately 15 seconds <br /> a and recorded on the boring log, <br /> Task C: Install Gmmd Wa l�r Moni oringWell• <br /> Ground water monitoring wells will. be installed <br /> onsite and offsite in the approximate locations <br /> shown in Figure 5. The monitoring wells will be <br /> drilled with 10-inch-diameter, continuous-flight, <br /> hollow stem augers. The monitoring wells will be. <br /> constructed of clean, 4-inch-diameter, <br /> - 3 flush-threaded, Schedule 40 PVC blank and screened <br /> (0. 020-inch slot size) casing. The annular space <br /> surrounding the screened portion will be backfilled <br /> with No. 3 Monterey sand (as filter pack) to <br /> approximately 1.5 feet above the top of the screened <br /> section. A 1.5-foot-thick bentonite annular seal <br /> will be placed above the filter pack and the <br /> remaining annulus grouted with neat cement to the <br /> , . surface. Utility boxes will be installed slightly <br /> above grade to minimize infiltration of surface <br /> waters. Locking, water-tight well caps will be <br /> installed to ensure the integrity of the well. <br /> Monitoring wells will be installed to a depth of. <br /> approximately 15 feet below the first saturated <br /> zone. The total depth for the monitoring wells is <br /> estimated at 25 feet below grade. Monitoring well <br /> r» construction details may change to accommodate <br /> _ site-specific conditions. If a competent clay layer <br /> is encountered below the first saturated zone, all <br /> necessary precautions..,will be taken to prevent <br /> penetration of this layer. <br /> <.;. <br /> Task b• vel-Q12, SamPle, andSurvey MQnitorincf Wells <br /> The ground water monitoring -wells will be - <br /> properly <br /> developed and sampled in accordance with SJC/PHS/EHp <br /> and RWQCB guidelines. Water samples will be <br /> collected from each well following proper <br /> 4 . <br />