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1590 Solano Way RECEIVE . #A Concord, CA 94520 JAN 2 6 2011 � ENVIRONMENT, H PERMJTISERVICEfi�T January 21, 2011 TRC Project No. 177606 Ms. Lori Duncan San Joaquin County Environmental Health Department boo East Main Street Stockton, California 95202-3029 RE: WELL DESTRUCTION REPORT CALIFORNIA CENTRAL TRACTION COMPANY(CCT) 1645 CHEROKEE ROAD STOCKTON, CALIFORNIA Dear Ms. Duncan: On behalf of Central California Traction Company(CCT), TRC submits this Well Destruction Report documenting the proper destruction of three (3)groundwater monitoring wells at the subject site, located at 1645 Cherokee Road in Stockton, California(Site) (Figure 1). Monitoring wells MW-5, MW-6 and MW-7 were destroyed on December 27 through December 28, 2010, in accordance with applicable regulatory guidelines for abandoning wells. The destruction of the wells occurred pursuant to the regulatory site closure approved by San Joaquin County Environmental Health Department(SJCEDH), in a letter dated December 9, 2010. Prior to mobilization, a well destruction permit was obtained from the SJCEHD. A copy of the permit is included in Appendix A. Figure 2 shows the locations of the former wells. The three groundwater monitoring wells were properly destroyed by over drilling both the well casing and filter pack materials using a hollow stem auger(HSA) drilling rig. The boreholes were subsequently backfilled with tremied neat cement grout in accordance with SJCEHD requirements and California Well Standards 74-81 and 74-90. The well boxes were removed and the void space was then backfilled with neat cement grout to within 0.5 feet below grade, and capped with dirt and gravel to match existing surface. Well destruction details are summarized in Table 1. Waste residuals (soil cuttings,wastewater and grout)were placed in California Department of Transportation (DOT) approved 55-gallon drums and temporarily stored on site pending profiling and disposal. On January 19, 2011, Environmental Logistics, Inc. transported 12 drums to the Filter Recycling Services disposal facility located in Rialto, California. The waste manifest for the twelve drums is included in Appendix B.