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Car ho <br /> ERC <br /> Shaping the Future <br /> Cardno ERI <br /> License A/C 10/C36-611383 <br /> January 24, 2014 <br /> Cardno ERI 2789C.Q134 601 North McDowell Blvd. <br /> Petaluma,CA 94954 <br /> Phone+1707 766 2000 <br /> Mr. James Barton, P.G. Fax +1707 789 0414 <br /> California Regional Water Quality Control Board www.cardno.com <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 www.cardnoeri.com <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT Groundwater Monitoring and Remediation Status Report, Fourth Quarter 2013 <br /> Former Mobil Service Station 99CAS <br /> 75 East Alpine Avenue, Stockton, California <br /> INTRODUCTION <br /> At the request of ExxonMobil Environmental Services (EMES), on behalf of ExxonMobil Oil Corporation, Cardno <br /> ERI performed fourth quarter 2013 groundwater monitoring and sampling and remedial activities at the subject <br /> site. Relevant plates, tables, and appendices are included at the end of this report. Currently, the site is a <br /> vacant lot and a parking lot. <br /> GROUNDWATER MONITORING AND SAMPLING SUMMARY <br /> Gauging and sampling date: 12/18/13 <br /> Wells gauged and sampled: MW2, MW5, MW5, DW1, DW3, EX1, EX2 <br /> Presence of NAPL: Not observed <br /> Remediation system status on sampling date: Active <br /> Laboratory: Calscience Environmental Laboratories, Inc. <br /> Garden Grove, California <br /> Analyses performed: EPA Method 80158 TPHd, TPHg <br /> EPA Method 8260B BTEX, MTBE, TBA, DIPE, ETBE, TAME, EDB, 1,2-DCA <br /> EPA Method 6010B Arsenic, Calcium, Lead, Selenium (well MW2 only) <br /> Waste disposal: 174 gallons of purge and decon water and 755 gallons of water pumped from the <br /> holding tank were delivered to InStrat, Inc., of Rio Vista, California on 12/19/13 and <br /> 12/13/13, respectively <br /> Australia • Belgium • Canada • Colombia • Ecuador • Germany • Indonesia Italy <br /> Kenya • New Zealand Papua New Guinea • Peru • Philippines • Tanzania <br /> United Arab Emirates • United Kingdom • United States • Operations in 85 countries <br />