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9.2 Monitoring_ _Well _Development <br /> Each well was developed using surge block agitation and bailer/pump <br /> evacuation in order to settle the sandpack prior to placing the bentonite <br /> and cement seals Additional water was removed prior to the sampling of <br /> each well in order to further clarify the groundwater produced in the <br /> wells In total, at least ten times the volume of the well casing in the <br /> saturated screened interval plus one total volume of water in the well <br /> casing was removed during the development process Upon completion <br /> of the well development, the water produced in all ten wells was relatively <br /> clear <br /> 9 .3 Monitoring Well SamIlling <br /> On May 12 and 14, 1999, ASE staff geologist Greg Schramm collected <br /> groundwater samples from each monitoring well for analysis A sheen <br /> was present on the surface of groundwater in monitoring well MW-6 <br /> Prior to sampling, the wells were purged of four well casing volumes of <br /> groundwater using any combination of Purger pumps, Grundfos pumps <br /> and/or dedicated bailers The pH, temperature and conductivity of the <br /> purge water were monitored during evacuation, and samples were n o t <br /> collected until these parameters stabilized Samples were collected from <br /> the wells using pre-cleaned dedicated polyethylene bailers The <br /> groundwater samples for volatile compounds were decanted from the <br /> bailers into 40-m1 VOA vials, preserved with hydrochloric acid and sealed <br /> without headspace The samples for diesel analysis were contained in 1 - <br /> liter amber glass containers All of the samples were labeled and stored <br /> on ice for transport to Chromalab under chain of custody See Appendix E <br /> for a copy of the Field Logs <br /> 9.4 Purge Water Disposal <br /> Well development and sampling purge water were contained in 55-gallon <br /> steel drums and a temporary poly tank and were left on-site for <br /> temporary storage This water was subsequently removed from the site <br /> on May 21, 1999 by Clearwater Environmental Services which transported <br /> the water to Alviso Independent Oil in Alviso, California for recycling <br /> 10 . 0 GROUNDWATER ELEVATIONS AND FLOW <br /> The ground surface elevation and top of casing elevation of each <br /> groundwater monitoring well was surveyed relative to mean sea level <br /> (msl) by Farley Surveying, Inc. of Stockton, California on May 20 and 24, <br /> Franks One Stop Report - June 1999 <br /> -9- <br />