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dHRONOLOGY <br /> 15688 Harlan Road* Lathrop <br /> 04/25/07 Two 500 gallon underground storage tanks (UST)found during construction work <br /> were removed on this date., The area has since become landscaping'for a motel . <br /> and a City of Lathrop side:Walk. A soil sample was collected from beneath each <br /> UST at 7 feet The analytical results showed . 1 and 1.8 rhg/kg of total petroleum j <br /> hydrocarbons as diesel JOH-d). leo oxygenates were detected. l <br /> 05/18107 Since groundwater has been as shallow as five feet, excavation of 'soil was <br /> performed. A sail and grab water sample were collected. The excavation was ; <br /> filled with clean material and the stockpile was appropriately disposed. The <br /> analytical results of the grab water sample had high'concentrations of TPH-d but <br /> the soil sample only had *6 mg/kg of TRH-d. No oxygenates were detected in <br /> the soil or water sample. <br /> 09114/07 An unauthorized release report and a notification of hazardous waste discharge <br /> form were filed on this date. The responsible parties were sent notices of <br /> responsibility and the site Was placed in the Local Oversight Program. <br /> 04/28/08 Three monitoring wells were installed can this date. Monitoring wel! fuIW1 was <br /> placed in the area where the UST had been removed. ;. <br /> 08I13I08 The date of the Site Investigation Report that discusses the April 2008 work:. No � <br /> soil contamination was found in any of the sail samples analyzed. <br /> 11/25/08 The Environmental Health�department discussed closure of the site with the <br /> Regional Board on this date. It was requested that oxygenate.analysis be added <br /> to the groundwater testing. i <br /> 01/29/09 The date of the Fourth Qukter 2008 monitoring report. The only contamination , <br /> found in the water sampleO after three quarters of sampling is TPH d at 74 ug/t, <br /> The report recommends closure of the site. <br /> i <br /> i <br /> 1 <br /> l <br />