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Mr.Nuel Henderson, SJCEHD October 17,2005 <br /> Site Investigation Work Plan <br /> Former Quick-n-Save Market&Gas,Stockton,California <br /> Page 4 <br /> will be screened for volatile organic compounds using a photoionization detector (PID). <br /> Stratus will record PID readings, soil types, and other pertinent geologic data on a borehole <br /> log. A minimum of two soil samples (above first encountered water) from each boring will <br /> be submitted for chemical analysis. Additional samples may be selected for chemical <br /> analysis based on soil type and field observations. Details regarding exploratory boring <br /> and well construction procedures are included in Appendix A. <br /> Task 213: Monitoring Well Installation <br /> Groundwater monitoring wells MWA through MW-3 will be installed to a depth of <br /> approximately 10 feet below first encountered groundwater. Monitoring wells will be <br /> constructed using 2-inch diameter PVC casing, and the well screen will consist of 20 feet of <br /> 0.02-inch diameter machine slotted casing, situated from approximately 25 to 45 feet bgs. <br /> A filter pack of #3 LonestarTm sand will be placed in the annular space around the well <br /> casing from the bottom of the well screen to approximately two feet above the top of the <br /> well screen. Approximately three feet of bentonite will be placed on top of the filter pack <br /> and hydrated with clean water to provide a transition seal for the well. Neat cement will be <br /> used to backfill the remaining annular space around the well casing. A watertight locking <br /> cap will be placed over the top of the well casing, and a traffic rated vault box will be <br /> installed around the top of the well. The actual well construction may be modified in the <br /> field based on conditions encountered at the time of the investigation. <br /> Task 2C: Waste Mana egement <br /> Drill cuttings and wastewater generated during the field activities will be contained in <br /> U.S. 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 contractor <br /> will transport the soil and wastewater to an appropriate facility for disposal. <br /> Task 2D: 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 /> A minimum of 24 hours after the groundwater monitoring wells are developed, the <br /> monitoring wells will be purged and groundwater samples will be collected. The samples <br /> will be collected using a disposable bailer, transferred to laboratory-supplied glass vials, <br /> and placed in an ice-chilled cooler. The groundwater samples will be transported under <br /> KAQuick-n-Save\Work P1ans\quicknsave-wp-101705.doc STRATUS <br />