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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Soil Vapor Sampling <br /> January 31, 2011 <br /> 4.2.5 Conclusions and Recommendations <br /> TPHg was detected in the soil vapor sample collected from UPSV-5 at a concentration of <br /> 831 ppmV. All other reported TPHg concentrations were non-detect (less than 2.4 ppmV) in the <br /> APSV and UPSV wells during the reporting quarter. BTEX, Naphthalene and the five fuel <br /> oxygenates (MtBE, DIPE, EtBE, TBA, and TAME) were not detected at or above laboratory <br /> MRLs during 4Q10. <br /> Based on data presented in this report, Stantec recommends continuing with the soil vapor <br /> monitoring schedule as presented in the Work Plan prepared by SECOR and entitled Revised <br /> Work Plan for Soil Vapor Assessment and Response to RWQCB-CVR Letter Dated May 3, <br /> 2005. Results of future sampling will be provided in Stantec's corresponding quarterly Site <br /> monitoring and sampling reports. <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 4.3 <br />