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Stantec March 8, 2013 Page 2 of 5 Well Destruction Report PRE-FIELD ACTIVITIES Prior to initiating fieldwork, all appropriate permits were obtained from the San Joaquin County Environmental Health Department (SJCEHD). Copies of the permits are included in Attachment B. Prior to field activities, a notification was provided to the property owners and the SJCEHD. Underground Service Alert (USA) was notified prior to commencing drilling activities to identify any public utility alignments that may have been located adjacent to the existing well locations. Stantec also contracted a geophysical survey company to identify any private utility alignments that may have been in potential conflict with the drilling. The geophysical survey report is included in Attachment C. Field activities were conducted under the supervision of a California Professional Licensed Geologist, and in accordance with a site-specific health and safety plan (HASP). WELL DESTRUCTION On November 19 and 20, 2012, Stantec observed the destruction of groundwater monitoring wells MW-29, MW-30, MW-32, and MW-33 located south and southwest of the Mormon Slough and south of the L&M OU, Delta View Apartments, and West Webber Avenue, Stockton, California. The former location of wells MW-29, MW-30, MW-32, and MW-33 are shown on Figure 2. Wells MW-29, MW-30, MW-32, and MW-33 were destroyed by completely over drilling the well casing to remove all well materials in accordance with SJCEHD requirements. Prior to over-drilling, the geophysical survey company used ground penetrating radar (GPR) scan at each location to further check for utilities. The GPR scan procedures are used to ensure no existing or new utilities are located adjacent to the constructed well that could be damaged during well destruction activities. The wells were over-drilled using an eight inch diameter auger bit, and well construction materials and debris were removed. Following removal of all well material, the resultant borehole was grouted through tremmie pipe to the surface by National Exploration, Wells, and Pumps (National), under the supervision of the SJCEHD. WASTE MANAGEMENT The well box, casing materials, and drill cuttings were contained in properly labeled 55-gallon drums, and removed from the Site by Belshire Environmental Services, Inc. (Be!shire) for disposal. The waste manifests are included in Attachment D. CONCLUSIONS Based on direction from the RWQCB-CVR in an email dated October 20, 2012 (Attachment A), Stantec properly destroyed monitoring wells MW-29, MW-30, MW-32, and MW-33. The monitoring wells were destroyed per SJCEHD requirements.