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Remo Canepa Page 9 of 9 <br /> 6230 Pacific Avenue 4/17/2009 <br /> Stockton CA <br /> • Add butane and pentane to the analyte list for all samples, prepare iso- <br /> concentration maps for both compounds if detected and quantified ; <br /> • Use appropriate sample blanks during the next monitoring event to address the <br /> issue of potential cross contamination from fueling activities during sample <br /> collection ; and <br /> • Collect and analyze soil gas samples from shallow and intermediate depths for <br /> TPHg , BTEX, MTBE , butane and pentane. <br /> The EHD has reviewed data derived from your monitoring program and directs the <br /> following modification to the sampling frequency of your monitoring wells: <br /> • Semi-annual sampling — MW- 1 , MW-2, MW-3 and SV-4 <br /> • Annual sampling — MW-4, MW-11 , if accessible SV-1 through SV-3, and SV-5 <br /> through SV-9 <br /> • Biennial — MW-5, MW-6 , MW-7, MW-9, MW-10 and MW- 12D. <br /> Include analysis for butane and pentane as part of the analytical suite for the next <br /> monitoring event for each well . <br /> If you have any questions or comments regarding the issues in this letter, please contact <br /> Nuel Henderson , PG , at (209) 468-3436 ; other concerns with your site should be <br /> directed to Frank Girardi, Senior Registered Environmental Health Specialist, at (209) <br /> 953-7868. , J <br /> �� Z �y <br /> Nuel C . Henderson, Jr. , PG MargaretL a , RENS <br /> Engineering Geologist Program Coordinator <br /> C : James Barton, RWQCB, 11020 Sun Center Dr. #200 , Rancho Cordova , CA 95670 <br /> C: Robert Marty, AGE, 837 Shaw Road , Stockton , CA 95215 <br /> Second Release Evaluation 0409 <br />