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Former Beneto Facility Page 2 <br /> 749 East Charter Way April 13 , 2012 <br /> Stockton , California 95202 <br /> • Analyzing groundwater samples for total petroleum hydrocarbons as gasoline (TPHg) ; <br /> benzene, toluene , ethylbenzene and total xylenes (BTEX) ; methyl tertiary-butyl ether <br /> (MTBE) , ethyl tertiary-butyl ether (ETBE) , tertiary-amyl methyl ether (TAME) , di- <br /> isopropyl ether (DIPE) and tertiary butyl alcohol (TBA); and soil gas samples for TPHg , <br /> BTEX and MTBE; <br /> • Storing evacuated groundwater in an on-site holding tank, pending analytical results <br /> from the California-State-certified laboratory. <br /> Considering the screen interval of MW-5 , the most impacted well , is 45 to 65 feet below <br />'I surface grade (bsg) and groundwater is currently at approximately 28 to 29 feet bsg , the EHD <br /> believes it is unlikely that any vapor will be extracted from MW-5, and most vapor will be <br /> recovered from MW- 1 . The EHD approves the work plan as submitted . <br /> Following the DPE pilot test, submit a report of findings to the EHD within sixty days of <br /> completing the study. Include a cost estimate for implementing a DPE remediation system if <br /> results from the pilot study are favorable. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at <br /> vmccartney@sjcehd . com . <br /> Sincerely, <br /> Victoria L. McCartney, REHS U Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Dan Lafontaine , PG , Apex Envirotech , Inc. , 11244 Pyrites Way , Gold River, <br /> California 95670 <br /> Mr. James L . L. Barton , PG , California Regional Water Quality Control Board Central <br /> Valley Region , 11020 Sun Center Drive , Suite 200 , Rancho Cordova , California 95670 <br /> Mr. Muhammad Rizwan , 4917 Tiller Ct. , Stockton , California 95206 <br />