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145 South Sutter <br /> Page 2 <br /> Groundwater Investigation <br /> Groundwater contamination was detected in the samples collected from monitoring wells, <br /> MW2A and MW8 (approximately 300 feet northeast of the site). Actually, free product <br /> was observed during the installation of MW2A and reported during the sampling of <br /> MW2A. <br /> Table 2 also contained reporting errors with regards to groundwater sample results. <br /> Actually, 3,300 ug/I toluene was detected in the duplicate sample from MW2A and the <br /> 820 ug/I TPH-g detected in MW8 should be noted to be an unidentified hydrocarbon <br /> between the C6 - C8 range of hydrocarbons. <br /> Also, note that the report failed to include field data sheets associated with the collection <br /> of groundwater samples. As PHS/EHD has indicated on numerous occasions, field data <br /> sheets should be submitted with all quarterly monitoring reports. Finally, the analytical <br /> results obtained from all groundwater monitoring events should be tabulated so that <br /> trends can be distinguished. Please prepare a table summarizing all groundwater <br /> analytical results obtained to date for submittal in the next quarterly monitoring report. <br /> The report included recommendations to continue quarterly monitoring and to drill <br /> additional borings, one at least to be converted into a monitoring well. PHS/EHD <br /> concurs that additional soil and groundwater investigation is necessary. <br /> We would like to arrange a meeting to discuss the site, prior to the preparation a work <br /> plan proposing the additional field work which is necessary to determine the distribution <br /> of the residual soil and groundwater contamination. <br /> Please contact Mary Meays at (209) 468-0337, if you have any questions or to schedule <br /> a meeting to discuss the site. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> it <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\145SUTT <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Frances Okamoto <br /> cc: Carla Brassaemle, Weston <br /> cc: Brooke Birkie, Nuemiller and Beardslee <br />