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PUBLIC HEALTH SERVV±gCES � ���✓I <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> NOV 0 3 1997 <br /> KATHLEEN FRANCO <br /> 2454 COUNTRY CLUB BLVD <br /> STOCKTON CA 95204 <br /> RE: Shell Oil Site Code: 1070 <br /> 2575 Country Club Boulevard Stockton CA <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD)has recently received <br /> faxed copies of the laboratory report on the water sample collected from your well and has prepared a summary <br /> of the results of the September 26, 1997 sampling event. <br /> Sample ID Date Collected MTBE (8020/8260) BTEX(8020/8260) TPH-gasoline(8020) <br /> 2454 CC Port 9/26/97 <2.5/<2.0 <0.5/Q.0 <50.0 ppb <br /> Vote: Port-Sample port connected to the well's pump was used for sample collection <br /> MTBE-Methyl Tertiary Butyl Ether(EPA Method 8020:GC-PID/EPA Method 8260:GUMS) <br /> BTEX-Benzene.Toluene,Ethylbenzene,and Xylene <br /> All results in ppb-parts per billion-µg/l <br /> No contaminants were reported above the laboratory detection limits from the sample collected from the <br /> sampling port. The copy of the analytical results has been included and the complete laboratory report will be <br /> forwarded once it is available. The pump that is used for this well is ajet pump and is situated atop the casing, <br /> preventing the collection of the groundwater sample directly from the well. Jet pumps are self priming and <br /> recharging so that samples collected from the sampling port may have come in contact with air. Standard <br /> practice mandates that volatile organic groundwater samples be collected to minimize contact with air which can <br /> reduce concentrations in the water due to the action of volatilization. Unfortunately, the configuration and type of <br /> pump that is used for this well will prevent the collection of more representative samples. Please note, that <br /> contamination has not been detected in the pump samples from the wells immediately neighboring your property. <br /> PHS/EHD has directed Shell to repair and replace chlorinating plugs of these wells, so that samples may also be <br /> collected directly from the well without any pumping influences. Also, Enviros, Shell's environmental <br /> consultant has stated that the Department of Water Resources' records will be reviewed to obtain information <br /> pertaining to the construction of the well located on your property. If you have any information regarding <br /> construction details and/or date of installation, please contact me. <br /> PHS/EHD has directed Shell Oil to include your well in their quarterly sampling program, if your permission is <br /> granted. PHS/EHD will continue to keep you informed, as information becomes available. Please contact meat <br /> (209) 468-0337, if you have any questions. Thank you for your cooperation. <br /> Donna Herrin, Director, REHS <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret agorio, RE <br /> Site Mitigation Unit Supervisor <br /> enclosure <br /> cc: Interested Parties (w/o enclosure) <br /> A Division of San Joaquin County Health Care Services <br />