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425 North Union Street <br /> Page 2 <br /> During the installation of MW2, field measurements and observations indicated the <br /> presence of petroleum hydrocarbons. The maximum photoionization detector (PID) <br /> measurement recorded was 1088 ppm at 45 feet below ground surface. The laboratory <br /> results do not correlate with field observations, because the results reported were non- <br /> detect for petroleum hydrocarbons. Please provide some explanation as to this <br /> discrepancy. Also, please provide the QA/QC data sheets for laboratory analysis which <br /> was reported. PHS/EHD has repeatedly requested this information in the past and it <br /> should be included in all reports submitted. <br /> The recommendations for further work included the drilling of two additional soil borings <br /> to sample both soil and groundwater to the east and northeast of the former location of <br /> tank #3. PHS/EHD concurs that these soil borings should provide information to <br /> determine the extent of residual soil contamination and may provide further groundwater <br /> quality data. Additional investigation and/or remediation of residual contamination <br /> associated with former tank #4 will also be necessary. Please submit a work plan by <br /> February 15, 1994 for the proposed and requested additional investigation. Also, you <br /> should be aware that quarterly reporting is recognized as a minimum reporting <br /> requirement. The next quarterly monitoring event should be scheduled by January 6, <br /> 1994. <br /> If you have any questions, comments, or wish to schedule a site inspection, please contact <br /> Mary Meays, Senior REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> I ) <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> DH/MM/425UNION <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Brett Larson, Union Ice 6100 East Sheila Street, L.A. CA 90040 <br /> c: Steve Furnas, WHF Environmental <br /> c: Dennis Green, Mayall, Hurley, Knutsen, Smith and Green <br /> C.* Lee Hansen, Arctic Ice <br />