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PUBLIC HEALTH SERVICE <br /> PQ.U,N <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 /> SOUTHLAND CORPORATION MAY 14 2001 <br /> PAUL SARRETT <br /> 10220 SW GREENBURG RD STE 470 <br /> PORTLAND OR 97233 <br /> RE: 7 Eleven Store #14117 Site Code:1073 <br /> 2725 Country Club Blvd. LOP-RO#:0000013 <br /> Stockton, CA., 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the "First Quarter 2001 Monitoring and Sampling Report" dated March 30, <br /> 2001 as submitted by IT Corporation on May 3, 2001 and has the following comments. <br /> This quarterly monitoring report (QMR) covered the sampling event held on February 7, <br /> 2001. The analytical laboratory data from the groundwater samples for all four <br /> monitoring wells reveal that all the wells are impacted by the petroleum release <br /> associated with this site. Of particular concern is the methyl-tertiary butyl ether (MtBE) <br /> concentration in MW-2. The 11,000 micrograms per liter (µg/1) of MtBE is the highest <br /> concentration reported for this site. Additionally, the concentration of MtBE in MW-2 <br /> indicates a pattern of generally increasing values. <br /> I have referred this site to the Underground Storage Tank Unit of PHS-EHD and have <br /> requested an inspection of your tanks and delivery system. <br /> You have been monitoring the groundwater quality for petroleum impacts since the <br /> monitoring wells were installed in May 1999. The data from the quarterly reports has <br /> indicated that there is no consistent direction of groundwater gradient and petroleum <br /> constituents have impacted all of the monitoring wells. The groundwater plume is not <br /> defined and you have not recommended a next course of action to define the plume. In <br /> order to ensure that you progress towards completing your required investigation, PHS- <br /> EHD will require you to implement the following schedule. <br /> You are hereby directed to submit a work plan to define the groundwater plume <br /> by July 9, 2001. Additional monitoring wells.are needed in all areas surrounding the <br /> site. The vertical extent of soil contamination on site is to be defined and monitoring <br /> wells with short-screened intervals should be installed if deep soil contamination is <br /> detected. <br /> You are hereby directed to complete the investigative phase for this site and <br /> submit the Problem Assessment Report by June 28, 2002. <br /> A Division of San Joaquin County Health Care Services <br />