SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Complaint No. 11917 • - 5 - • 8 November 2013 Valero/Jamar Service Station \ Stockton, San Joaquin County 4. Concern that leaking fuel tanks were not removed from the neighboring gas station. SJECHD records show one 350-gallon waste oil UST and one 500-gallon kerosene UST were removed, rinsed and transported to Schnitzer Steel in Rancho Cordova in June 1995. Figure 1 shows the waste oil UST was 5' north of the station building outside of the north-facing service bays while the kerosene UST was 8' from the southwest corner of the station building. In December 1998, two 6,000-gallon and one 10,000-gallon gasoline USTs were removed and replaced by one 20,000-gallon UST. 5. Concern for exposure to methyl t-butyl ether found in the groundwater underlying the gas station. Given the data reported from the Jamar Service Station there are no complete pathways from pollutants detected at the service station and your home. Soil impacts do not appear to extend off the Jamar property in the direction of your home and you are not in contact with impacted groundwater found at greater than 50 feet below the ground surface. In addition, from interpretation of available data, we do not believe the groundwater impacted by MTBE extends under your home. Although MTBE is soluble in groundwater, this chemical is only moderately volatile. Since groundwater impacted by MTBE is not believed to extend under your home any potential impacts from vapor migration are highly improbable. 6. Lack of response from the local water purveyor Staff of the Central Valley Water Board are not able to comment on the concern expressed regarding the responsiveness of the local water purveyor. 7. Reduced property value It is not within our authority or expertise to address property values. 8. Threats, unspecified It is not within our authority to address unspecified threats you may have received. It is our understanding that you have contacted the local authorities concerning this issue. In conclusion, based on data obtained from the Jamar Service Station and results of samples collected from your residence at 931 N. Oro Street, petroleum hydrocarbons in soil and water underlying the Jamar Service Station are not the cause of oil and grease found in the toilet tank and outdoor spigot on your property. Your property is 135 feet northeast of the Jamar Site USTs. Gasoline and motor oil released at the Jamar Service Station has been delineated in groundwater at a depth of greater than 50 feet below ground may extend about 40' to the north/ northeast of the Jamar property based on data from MWA2A, the closest well to your home and professional interpretation of the data. This groundwater pollution therefore, does not extend under your property. In addition, soil impacted by the petroleum released at the Jamar site is limited to the Jamar property boundaries. From our investigation of the environmental conditions surrounding the Jamar Service Station we did not identify any adverse pollutant exposures from the petroleum release and cleanup operations at the Jamar Service Station to your residence.