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0 <br /> Ms. Devra Lewis <br /> February 20, 2003 <br /> Page 5 of 6 <br /> a minimum of 10 borehole volumes of water have been removed, the development water is free <br /> of sediment and turbidity compared to the beginning of development (i.e., the water is clear and <br /> the turbidity measurement is less than 100 NTUs), and three consecutive measurements of water <br /> quality parameters do not vary by more than the following values: <br /> • pH—0.3 units; <br /> • Temperature— 1 degree Celsius; and <br /> • Specific conductance— 10 percent. <br /> If parameters have not stabilized after 13 borehole volumes of water have been purged, then the <br /> well development will be considered to be complete. In addition, well development will be <br /> considered to be complete if the well goes dry prior to the removal of the minimum 10 borehole <br /> volumes. All well development water will be contained pending testing to determine the <br /> appropriate disposal method. The bottom of the well will be "sounded" to ensure fine material <br /> has been removed from the interior of the well casing. <br /> Bailers and surge blocks used to develop more than one well will be decontaminated by wiping <br /> with a detergent such as Simple CrreenTM, then washing with an AlconoxTm solution followed by <br /> a tap water rinse and distilled water rinse. The outside of pump tubing will be decontaminated <br /> by spraying with an AlconoxTm solution and distilled water rinse. The interior of pumps and <br /> pump tubing will be decontaminated by pumping distilled water through the pump and tubing <br /> until the specific conductance of the discharge water is equal to or less than 50 <br /> microSicmens/centimeter. <br /> Waste Disposal <br /> Investigation-derived wastes will be containerized in separate 55-gallon drums for solids and <br /> liquids. Drums will be labeled and stored onsite pending waste characterization. Final disposal <br /> will be coordinated by Shell's Residuals Management Program <br /> Well Head Elevation Surveying <br /> Within two weeks of well installation, PLS Surveying, Inc., will obtain horizontal and vertical <br /> coordinates for all new wells. PLS will survey the wells to the existing datum for the site and the <br /> information will be added to the quarterly sampling and monitoring program <br /> Summary Reporting <br /> A draft Monitor Well Installation Report will be provided to CVRWQCB by May 16, 2003, for <br /> review. The report will summarize the field activities and sampling results for the direct push <br /> borings and monitoring well installation. The report will include boring logs and laboratory <br /> analytical reports. <br />