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0 0 <br /> Ms. Julie Raming - 2 - 11 September 2003 <br /> for MW-23 included in the Report states 40 gallons of water was purged from the well <br /> during development activities. Regional Board staff is not opposed to adding water <br /> during well construction due to heaving sands,but GPC, at a minimum,needs to purge <br /> out the approximate amount of water that was added to the well. <br /> 2. The Work Plan states that the ozone will oxidize the chloroform to carbon dioxide and <br /> chloride. However, the proposed groundwater analyses do not include either of these. <br /> GPC needs to include analysis for carbon dioxide and chloride in the pilot study <br /> monitoring. <br /> Regional Board staff concurs with the Work Plan provided that carbon dioxide and chloride <br /> analyses are included in the air/ozone sparging pilot test. Based on the schedule included in the <br /> Work Plan to install the sparge points and air/ozone injection system,by 12 March 2004,please <br /> submit an air/ozone pilot study summary report that includes a discussion of the system <br /> installation,results of groundwater monitoring, and recommendations for full-scale <br /> implementation, if applicable. If you have any questions, you may contact me at (916)255-3119 <br /> or by email at lewisd@rb5s.swrcb.ca.gov. <br /> Low11 _4- <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> cc: Mr. Mike Infuma, San Joaquin County Health Department, Stockton <br /> Mr. Robert L. Hammond, Acton Mickelson Environmental, Inc., El Dorado Hills <br />