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UST SYSTEM REMOVAL AND REPLACEMENT REPORT <br />Summary <br />January 22, 2021 <br />Two 10,000-gallon single-walled steel USTs were removed from the site on December 1, 2020. Seven soil samples <br />were collected beneath the dispensers, product piping, and USTs. <br />TPH-GRO was detected in two soil samples at concentrations of 1.19 mg/kg in TP-3-15.5 and 1.46 mg/kg in TP-2- <br />14.5.TBA was detected in three soil samples at concentrations ranging from 0.0153 mg/kg in TP-2-14.5 to 0.0497 <br />mg/kg in TP-4-15.5.Acetone was detected in three soil samples at concentrations ranging from 0.0253 mg/kg in TP- <br />3-15.5 to 0.0376 mg/kg in TP-4-15.5. Naphthalene was detected in TP-2-14.5 at a concentration of 0.00841 mg/kg. <br />Methanol was detected in TP-4-15.5 at a concentration of 1.90 mg/kg. Lead was detected in all seven soil samples at <br />concentrations ranging from 3.92 mg/kg in D-2-4 to 7.29 mg/kg in D-14. <br />On December 4,2020,two new 20,000-gallon double-walled fiberglass USTs were installed following the completion <br />of soil sampling and additional excavation.Approximately 935 tons were transported to Waste Connections Potrero <br />Hills Landfill in Suisun, California for disposal.Approximately 1,100,683 gallons of groundwater was pumped from the <br />excavation,treated, and discharged into the stormwater system under approval from the City of Stockton Municipal <br />Utilities Department. <br />us0385-ppfss01\workgroup\1858\active\185851012\05_report_deliv\deliverable\reports\2021_rpt_20632_ust.docx 5.1