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Complaint Investigation Summary Report #: 5105 <br />COMPLAINT ID: C00054889 Site Location: E LAFAYETTE ST BETWEEN S GRANT ST AND AURORA ST, WESTBOL <br />Activity Summary <br />Activity Date Recorded by <br />02/09/2023 Reviewed narratives. Reviewed sample results provided by Justin Duke, Ancon PRESTO <br />Northern California Hazardous Waste Manager. Sample results were taken of the <br />waste in the roll off bin for disposal determination. Sample results were analyzed <br />at 3 different labs. Sample results taken to Excelchem Laboratories (A Silver State <br />Analytical Company) by Ancon under work order number 2207177 and tested for <br />TPH as Diesel with result of 148 mg/kg, TPH as Motor Oil with result of 211 <br />mg/kg, and Mercury with a results of 0.081 mg/kg on 7/2/2022. Under the same <br />work order number 2207177 Excelchem then sent the results to McCampbell <br />Analytical to test for BTEX and MTBE with non-detect results on 7/26/2022 and <br />then to SilverState Analytical on 8/5/2022 to test for heavy metals with <br />non-hazardous results. Potrero Hills Landfill received and signed for the roll off bin <br />8/31/2022. Reprinted Log2 and 5105. <br />02/23/2023 Looked at sample results again. Revised narratives for 2/9/2023. Reprinted PRESTO <br />narratives. <br />03/01/2023 Discussion with lead senior on results. Revised narratives from 2/9/2023 with <br />PRESTO <br />details on results. Printed log2 and 5105 for abatement. <br />5105 rpt Page 3 of 3