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Former Shell Station page 2 <br /> 2575 Country Club Blvd . , Stockton February 18, 2011 <br /> 2. Provide an updated estimate of the residual contaminant mass Shell noted to be <br /> almost entirely in the saturated zone. <br /> 3 . Provide a re-evaluation of the residual contaminant concentrations utilizing the <br /> more conservative potable water and residential Environmental Screening Levels <br /> (ESL) and perform a tier II evaluation of any contaminant concentration that fails <br /> the ESLs and/or California Human Health Screening Levels (CHHSLs). <br /> 4 . Continue to monitor and sample groundwater monitoring wells and collect bio- <br /> attenuation parameters as recommended . The data from this testing is to be <br /> included in subsequent semi-annual monitoring reports . <br /> 5 . Provide a re-estimate or project the time required to achieve background <br /> conditions or water quality objectives (WQOs) using post-remediation <br /> concentration data trends . <br /> If you have any questions , please call Michael Infurna at (209) 468-3454. <br /> Michael J . Infurna Jr. , REHS Nuel C. Henderson Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton , CVRWQCB, Underground Storage Tank Unit, 11020 Sun <br /> Center Drive, #200, Rancho Cordova , CA 95670-6114 <br /> Mr. Mark Owens, SWRCB, Division of Clean Water Programs, Underground <br /> Storage Tank Program , P. O. Box 944212, Sacramento, CA 94244-2120 <br /> Mr. Joe Neely, Conestoga-Rovers & Assoc. , 19449 Riverside Dr. , Suite 230, <br /> Sonoma, CA 95476 <br />