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f Chronology Page 5 of 5 <br /> Former Morita Brothers g <br /> 814 E. Charter Way, Stockton, CA 95206 <br /> contaminants proposed to be left in place and that the elevated TPHg <br /> concentrations in monitoring well MW-208 were likely to be associated with the <br /> contamination at 749 E. Charter Way. The EHD also reviewed data related to <br /> increasing MTBE concentrations in monitoring;,well. MW-109, and concluded that <br /> the data indicated a migrating low concentration, low mass plume of MTBE that <br /> probably originated from`on-site; ;but which posed minimal threat- to sensitive <br /> receptors or human health; a`similar concentration history was shown by MW=106, <br /> located between the source area and MW-109. The EHD did not concur with the <br /> closure:recommendation at that time to allow for additional sampling of MW-109 to <br /> validate the model proposed by the EHD that provided a justification to consider <br /> site closure despite rising MTBE concentrations 'in MW-109: <br /> 05/20/2009 Date the EHD discussed closure of the with the Central ,valley Regional Water i <br /> Quality Control Board. , <br /> 09/10/2009 Date of Site Closure. Summary Report that�summarizes the site work and <br /> recommends site closure: <br /> 10/08/2009 Date of Groundwater Monitoring 3rd Quarter 2009 that contains-'water sample <br /> results from 8/13/09: ; <br /> i <br />