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GEORGE TAKEMORI <br /> PAGE 2 <br /> :,wells at the site. Should fate and transport calculations or a computer model be <br /> used for this site, all assumptions used should be tabulated and the values <br /> justified. If practicable, all input parameters that can be gathered from the site <br /> should be collected. <br /> ','Please be advised that a California Water Service site for a future municipal well <br /> is located approximately 1000 feet to the east of this site on "F" Street. This <br /> future well site must be considered when assessing future impacts of the plume <br /> on groundwater users. <br /> .Physical data supported by sufficient discussion should be presented to validate <br /> 'the opinion that natural biodegradation is occurring and is an effective remedial <br /> alternative for this site. Several "lines of evidence" of biodegradation and/or <br /> Bother natural attenuation processes should be presented, if possible. Graphing <br /> groundwater contaminant and water table elevation changes over time may be <br /> helpful. <br /> The information discussed above should be submitted to PHS-EHD for <br /> consideration for closure. A closure recommendation is warranted if the <br /> information indicates current and future beneficial uses of groundwater are <br /> protected. <br /> Also, please initiate sampling for methyl tertiary butyl ether (MTBE)'in <br /> ;groundwater starting with the next quarterly event. <br /> If you have any questions or wish to discuss this letter in more detail, please <br /> contact Linda Turkatte, Senior RENS, at (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> ' Environmental Health Division <br /> 7a <br /> Linda A. Turkatte, Senior REHS Margar Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> LT <br /> r r <br /> c: CVRWQCB, Beth Thayer , +... <br /> c: EMCON, Jay Johnson <br />