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CHRONOLOGY <br /> City of Ripon/Madsen Sunrise Dairy <br /> 239 South Stockton Street <br /> Ripon, CA 95366 <br /> 11/12/09 One three-compartment 12,000-gallon underground storage tank was removed <br /> from the site under permit and inspection by the San Joaquin County <br /> Environmental Health Department. Soil samples for laboratory analysis were <br /> collected from beneath the tank. <br /> 12/18/09 Laboratory analytical results reported 77 mg/kg total petroleum hydrocarbons <br /> (TPH) as gasoline and 2,000 mg/kg TPH as diesel under the west end of the <br /> tank. Notification of Hazardous Waste Discharge#09-118 filed this date. <br /> 12/31/01 Unauthorized Release Form filed this date online to Geotracker. Site placed in <br /> the Local Oversight Program; RO#1975. <br /> 01/05/10 Notice of Responsibility and Site Letters sent to the responsible parties: City of <br /> Ripon and Robert& Carol Madsen Trust. <br /> 08/05/10 The site investigation began this date with the advancement of four geoprobe soil <br /> borings, GP-1 through GP-4, to total depth of 32 feet below surface grade; soil <br /> and grab groundwater samples were collected for laboratory analysis for TPH as <br /> gasoline and TPH as diesel. See Gettler-Ryan's (GR) Limited Subsurface <br /> investigation Report dated September 30, 2010, available on Geotracker. <br /> 11/04/10 A meeting was attended by City of Ripon, Gettler Ryan and EHD to discuss the <br /> next step necessary to obtain the data needed to review the site for closure. It <br /> was agreed that one groundwater monitoring well would be installed down- <br /> gradient (based on review of regional groundwater flow direction maps from <br /> various contaminated sites in the area) from soil sample TW-13, and one angled <br /> soil boring would be installed to collect soil samples below TW-13. <br /> 01/13/11 One groundwater monitoring well, MW-1, and one angled soil boring, B-1, were <br /> installed this date. See Gettler-Ryan report Soil Boring and Monitoring Well <br /> Installation Report dated April 5, 2011. Submittal of the report was delayed in <br /> order to include the results from two groundwater monitoring and sampling <br /> events of MW-1, which were conducted two months apart from each other. The <br /> Report recommends site closure. <br /> 07/18/11 Case Closure Report dated July 15, 2011, submitted by Gettler-Ryan, was <br /> available on Geotracker this date. In the Report GR presents data supporting <br /> their determination that the site does not present a threat to human health or the <br /> environment, and again recommends site closure. <br />