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UST SYSTEM REMOVAL REPORT <br />7-ELEVEN STORE NO. 17334, 4501 N. PERSHING AVENUE, STOCKTON, CA 95207 <br />Introduction <br />March 3, 2023 <br />v:\1858\active\185851132\05_report_deliv\deliverable\reports\2023_rpt_17334_ust.docx 1.1 <br /> <br />1.0 INTRODUCTION <br />This report documents underground storage tank (UST) system removal activities conducted at 7-Eleven Store No. <br />17334 located at 4501 North Pershing Avenue in Stockton, California (Figure 1). These services were conducted in <br />accordance with the requirements of the San Joaquin County Environmental Health Department (EHD). Stantec <br />Consulting Services Inc. (Stantec) conducted soil sampling and observed tank removal activities. Innovative <br />Construction Solutions (ICS) conducted the UST removal activities and completed site restoration following UST <br />removal. <br />1.1 PURPOSE AND SCOPE OF SERVICES <br />Stantec observed the removal of two existing USTs, two dispenser islands and the associated product and vent line <br />piping. Stantec collected soil and groundwater samples to assess subsurface conditions beneath the former UST <br />area, dispenser islands, and product piping. Stantec’s scope of services consisted of the following tasks: <br /> Preparation of a site-specific Health and Safety Plan; <br /> Observation of the UST removal activities; <br /> Collection of soil samples beneath the USTs, dispenser islands, and product piping at the direction of the <br />EHD specialist; <br /> Collection of a groundwater sample from the UST excavation at the direction of the EHD specialist; <br /> Coordination of laboratory analysis of soil and groundwater samples collected; and <br /> Preparation of this report documenting the UST removal activities. <br />1.2 BACKGROUND <br />In June 1996, the EHD issued a notification that the site was assigned to the EHD local Underground Storage Tank <br />(UST) Oversight Program (EHD Case No. 1233; Central Valley Water Regional Water Quality Control Board Case <br />No. 390521). <br />In October 1996, Flour Daniel GTI (FDGTI) collected two soil samples beneath the vapor return lines and two soil <br />samples from the soil stockpiles under the direction of the EHD. Benzene, toluene, ethylbenzene, and total xylenes <br />(BTEX), methyl-t-butyl ether (MTBE), and total petroleum hydrocarbons as gasoline (TPHg) were not detected in any <br />of the samples analyzed. <br />In February 1997, FDGTI supervised the drilling of seven soil borings (GP-1 through GP-7). TPHg concentrations <br />were not detected in any of the soil samples analyzed. The maximum MTBE concentration was detected in GP1-15’ <br />at 0.91 milligrams per kilogram (mg/kg). Benzene was detected in GP4-17’ at 0.0095 mg/kg. The maximum benzene,