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GE€s� <br /> GENESIS ENGINEERING$REDEVELOPMENT <br /> and notification of RWQCB staff of scheduled field tasks. Pre-field activities will commence <br /> upon notification to proceed. <br /> 3.2 Task 2—Direct-Push Reconnaissance Borings <br /> Eleven direct-push borings(DP-25 to DP-35)will be advanced to provide data regarding <br /> groundwater quality and assist in selecting permanent monitoring well locations. The <br /> reconnaissance borings will be advanced to a maximum depth of 25 feet bgs, and a grab <br /> groundwater sample will be collected from each boring using a peristaltic pump or dedicated <br /> disposable bailer. <br /> Groundwater samples will be sent to an analytical laboratory, filtered through a 45 micron <br /> filter, and analyzed for the following constituents: <br /> • Bicarbonate Alkalinity • Calcium <br /> • Chloride • Potassium <br /> • Sodium • Sulfate <br /> • Total Dissolved Solids • Electrical Conductivity <br /> The data will be used to determine the lateral extent of the dissolved inorganic constituent <br /> plume, and to select appropriate monitoring well locations for Task 3 —Monitoring Well <br /> Installation. If the measured constituent concentrations in the reconnaissance borings are <br /> within approximately 10 percent of the range of background levels observed in upgradient <br /> wells MW-1, MW-2, and MW-3,then characterization will be considered complete. If the <br /> inorganic constituent concentrations in the initial 11 reconnaissance borings are not within 10 <br /> percent of background concentrations,then additional step-out reconnaissance borings will <br /> be advanced prior to initiating Task 3. Continuous logging of the soils will be conducted for <br /> the borings. No chemical analysis of soil samples is proposed, unless evidence of off-Site <br /> soil contamination is encountered. <br /> 3.3 Task 3—Monitoring Well Installation <br /> The number and locations of the groundwater monitoring wells will be selected based the <br /> reconnaissance groundwater data. Monitoring wells will be proposed both crossgradient <br /> (north and south) and downgradient(east) of well MW-5,provided off-Site access can be <br /> obtained. The wells will be screened in the shallowest water-bearing unit, and will be used to <br /> assess groundwater quality in the shallow water bearing unit in the vicinity of MW-5. <br /> Continuous logging of the soils will be conducted for all monitoring well borings. <br /> The monitoring wells will be installed in accordance with the procedures in the Sampling and <br /> Analysis Plan. <br /> William DePaoli Property 4 of 7 <br /> Additional Groundwater Investigation Work Plan <br /> June 2009 <br />