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v %Wd <br /> Mr.Michael Infurna,SJCEHD April 7,2006 <br /> Well Installation Work Plan <br /> Palisades Station No. 835,Stockton,CA <br /> Page 9 <br /> chilled cooler. Strict chain-of-custody procedures will be followed from the time the <br /> samples are collected until the time the samples are relinquished to the laboratory. Soil <br /> contained in the remaining brass tubes will be screened for volatile organic compounds <br /> using a photoionization detector (PIA). Stratus will record PID readings, soil types, and <br /> other pertinent geologic data on a borehole log. A minimum of two soil samples from each <br /> boring will be submitted for chemical analysis. Additional samples may be selected for <br /> chemical analysis based on soil type and field observations. Details regarding exploratory <br /> boring procedures are included in Appendix A. <br /> Task 2B: Monitoring Well Installation <br /> Monitoring wells MW-11 and MW-20 will be installed using 4-inch diameter PVC well <br /> casing, and wells MW-12 through MW-19 and MW-21 will be installed using 2-inch <br /> diameter PVC well casing. Ten to twenty feet of 0.02-inch diameter well screen will be <br /> used to construct the monitoring wells. A filter pack of#3 Lonestarm sand will be placed <br /> in the annular space around the well casing from the bottom of the well screen to <br /> approximately 1 to 2 feet above the top of the well screen. Prior to installing the well seal, <br /> each well will be surged with a surge block to "seat"the filter pack around the well screen. <br /> Approximately 1 to 3 feet of bentonite will be placed on top of the filter pack and hydrated <br /> with clean water to provide a transition seal for the well. Neat cement will be used to <br /> backfill the remaining annular space around the well casing. A watertight locking cap will <br /> be placed over the top of the well casing, and a traffic rated vault box will be installed <br /> around the top of the well. The actual well construction may be modified in the field based <br /> on conditions encountered at the time of the investigation. <br /> Task 2C: Waste Management <br /> Drill cuttings will be containerized in a roll-off steel bin and stored on-site pending <br /> disposal. Wastewater generated during the field activities will be contained in U.S. <br /> Department of Transportation-approved 55-gallon steel drums. The drums will be <br /> appropriately labeled and stored at the site pending proper disposal. A licensed <br /> contractor will transport the soil and wastewater to an appropriate facility for disposal. <br /> Task 21): Monitoring Well Development and Sampling <br /> The newly installed monitoring wells will be allowed to stand a minimum of 72 hours <br /> before being developed. Monitoring well development will consist of surging with a <br /> bailer followed by groundwater pumping. Development will continue, to the extent <br /> practical, until the discharged water runs clean and pH and conductivity measurements <br /> stabilize. Water levels, water-quality parameters (pH, temperature, conductivity), and <br /> discharged quantities will be recorded for each well. <br /> KAUSA Gasoline\0835\Work PlanApalisades835 workpl=2006.doc STKATUS <br />