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CHRONOLOGY <br /> Stockton Terminal & Eastern Railroad <br /> 1282 North Shaw Road, Stockton <br /> 11/13/98 One 10,000 gallon underground storage tank (UST) used to store diesel fuel <br /> was removed this date under San Joaquin County Environmental Health <br /> Department (EHD) permit and inspection. Two soil samples for laboratory <br /> analysis were collected from beneath the tank and from the soil stockpile. The <br /> stockpile was returned to the excavation pit. <br /> 11/18/98 The laboratory report documenting petroleum hydrocarbon contamination in <br /> the soil samples from the UST pit and soil stockpiled was submitted this date. <br /> 12/30/98 A "Notification of Hazardous Waste Discharge" and Unauthorized Release <br /> Report#99-U01 was filed this date. <br /> 02/08/99 A "Notice of Responsibility" was sent this date to Stockton Terminal & Eastern <br /> Railroad (ST&ER) with an EHD letter directing submittal of a work plan to <br /> begin the site investigation. <br /> 08/24/99 The site investigation began this date. One soil boring (B1) was advanced to <br /> 40 feet below surface grade (bsg) and three soil borings (B2, 4, 5) were <br /> advanced to 30 feet bsg. Groundwater was not encountered. The highest <br /> depth to groundwater at this site is about 38 feet bsg. Water concluded to be <br /> from a former locomotive washing facility that was adjacent to the former <br /> locomotive fueling facility was found at <2 feet bsg in one attempted boring <br /> (B3). A sample of this water was collected for analysis. The soil samples had <br /> no odor except for the samples from 15 and 20 feet bsg in boring B-1. <br /> 09/07/99 Date of "Site Investigation & Closure Report' prepared by Upgradient <br /> Environmental Consultants. Boring B-1 soil samples from 15 and 20 feet bsg <br /> had TPH diesel contamination. The wash water sample also had TPH diesel. <br /> 03/19/01 Date of "Fate & Transport Model Report" prepared by Upgradient <br /> Environmental Consultants that concludes that the contaminant impact is not <br /> a threat because it is of limited extent, is of low-solubility and its movement is <br /> impeded by the fine-grained subsurface. <br /> 09/19/07 The EHD discussed the site with the Regional Water Quality Control Board <br /> this date and they wanted current information on the soil contamination to <br /> compare with that in boring B-1 to see if contamination had decreased over <br /> time and analysis of a groundwater sample. <br /> 01/02/08 Soil borings advanced this date; soil and grab groundwater samples collected <br /> for laboratory analysis. <br /> 09/15/08 Site Investigation Report submitted to GeoTracker, and to the EHD via email. <br /> Laboratory analytical results reported maximum concentration of total <br /> petroleum hydrocarbons as diesel of 110 milligrams per kilogram in the soil <br /> sample from boring B-8 at 11.5 feet and 150 micrograms per liter in the grab <br /> groundwater sample from boring B-5. <br /> 09/22/08 "Problem Assessment Report' and "Closure Summary Request' submitted to <br /> GeoTracker this date. <br />