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PUBLIC HEALT <br /> SAN OA SRVICE <br /> J QUIN COUNTY4�1N <br /> ENVIRONMENTAL HD MSION T, �a <br /> EALTH <br /> Karen Furst, M.D., M-PH., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA Copy'209/468-3420ALEX PEREZ . <br /> SHELL OIL COMPANY OR 1 7 <br /> PO BOX 8080 <br /> MARTINEZ CA 94553 <br /> RE: Shell Service Station <br /> 3011 W. Benjamin Holt Dr. SITE CODE: 1883 <br /> Stockton, CA., 95219 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has reviewed the Quarterly Monitoring Report - Fourth Quarter 1997 <br /> dated January 15, 1997 and has the following comments. <br /> On October 10, 1996 the old underground tanks (UGT) were removed and the <br /> new UGTs were installed in a different area. The quarterly monitoring event on <br /> February 26, 1997 recorded the first MTBE detection in the groundwater at 7,600 <br /> ug/I in MW-2 using EPA Method 8020 analysis. MW-2 is located immediately <br /> down-gradient of the new UGT pit and on November 19, 1997, analysis of the <br /> groundwater samples by EPA Method 8260 confirmed the presence of MTBE at <br /> 13,000 ug/I and Methanol at 6.3 ug/I (method 8020) in MW-2. The presence of <br /> Methanol and increasing concentration of MTBE may indicate that a recent <br /> release from the new tanks or the piping has occurred. Further investigation will <br /> be required by PHS-EHD. <br /> MTBE has now been detected in all three monitoring wells utilizing EPA Method <br /> 8260. In order for you to complete the assessment phase for this site, the lateral <br /> and vertical extent of MTBE in the groundwater must be defined. PHS-EHD <br /> hereby directs you to submit a workplan for delineation of the MTBE on <br /> and offsite. Please take immediate steps to secure an access agreement for <br /> each separate parcel that your subsurface investigation will be conducted on. <br /> The required workplan should be received at PHS-EHD before May 15, <br /> 1998. <br /> Separate boring permit applications and fees are required for each parcel a well <br /> or boring is to be placed on. The $89 fee per permit application should be <br /> submitted with the workplan and access agreements. <br /> A Division of San Joaquin County Health Care Services <br />