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4 <br /> CHRONOLOGY <br /> Flying J Travel Plaza <br /> 1501 North Jack Tone Road <br /> Ripon, California 95366 <br /> 05/22-29109 Dates that underground storage tank (UST) upgrades were performed at the site <br /> that included the installation of under dispenser containment and replacement of <br /> product piping in the area of the recreational vehicle fueling islands under permit <br /> issued by the San Joaquin County Environmental Health Department (EHD). <br /> Fifteen soil samples were collected beneath the piping and dispensers. i <br /> } <br /> y 07/21/09 Date of report submitted by the analytical laboratory, Environmental Science <br /> Corp., indicating that Diesel Range Organics (DRO) were detected in soil sample <br /> D6-1.5 at 240 milligrams per kilogram (mg/kg). <br /> 08/25/09 Date the EHD filed Unauthorized Release Form (URF) and Notification_ of <br /> Hazardous Waste Discharge No. 09-082. <br /> 09/15/09 Date of letter from the EHD informing the responsible party of his/her <br /> responsibility to perform corrective action, and the placement of the site into the <br /> Local Oversight Program (LOP). <br /> 10/19/09 Date of Work Plan for Preliminary Investigation submitted by OGI Environmental, <br /> LLC (OGI) proposing the advancement of a minimum of two soil borings to total <br /> depths of approximately 25 feet below surface grade (bsg); collection of soil <br /> samples at five-foot intervals; and collection of grab groundwater samples. <br /> 11/10/09 Date the EHD conditionally approved the work plan. <br /> 02/04/10 Date soil borings SB-1 and SB-2 were advanced at the site. ' <br /> l <br /> 03/15/10 Date of Preliminary Site Investigation submitted by OGI that reported the results <br /> from the advancement of the two soil borings. Contaminants of concern were not <br /> detected in any of the 8 soil samples collected and analyzed, or in the two grab <br /> groundwater samples collected at approximately 24 feet bsg; DRO was only <br /> detected at 45 micrograms per liter (pglL) in groundwater sample SB-1. i <br /> 04/13/11 Date the EHD discussed closure consideration of this site with the California <br /> Regional Water Quality Control Board Central Valley Region. <br /> I <br /> I <br /> J <br />