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CVvAfc ATC Associates Inc. 1 117 Lone Palm Avenue, Suite 201 Modesto,California 95351 209-579-2221 AS SO C I ATE S INC. Fax:209-579-2225 Subsurface Investigation dated August 16, 2010. ATC concluded the lateral extent of the Petroleum hydrocarbon impacted groundwater plume is adequately defined to the east, southeast, southwest, and north and generally defined to the south and west and that the plume appears stable with no trend determined for TPHg detected in groundwater from wells MW2 and MW3. ATC also submitted an Addendum to ATC's Additional Subsurface Investigation at Former Thiemann's Service Station dated September 1-5, 2010 which included an evaluation of soil concentrations. y3 ATC submitted to the SJCEHD the Closure Summary Report dated December 1�2, 2010. In addition, ATC also submitted to the SJCEHD the Addendum to ATCs Closure Summary Report Former Thiemann's Service Station, 106 West Second Street, Ripon, California dated November 29, 2011. In this report and addendum, ATC utilized the Central Valley Regional Water Quality Control Board (CVRWQCB) No Further Action (NFAR) Reporting criteria, concluded that the site does not appear to represent a significant risk to human health or the environment. NFA status was requested for the site. On December 21, 2011, the CVRWQCB issued a No Further Action Required Concurrence letter for the site. The letter stated that the CVRWQCB reviewed the Case Closure summary sent by the SJCEHD and that the Board agreed with the County's recommendations to close the site. On January 9, 2012, the SJCEHD issued a letter stating that it received the CVRWQCB No Further Action Required Concurrence letter for the site and required groundwater monitoring wells be property abandoned. The letter also requested a work plan be submitted that addressed the SJCEHD concerns and the San Joaquin County Well Standards. SCOPE OF WORK Planning and Permits ATC will obtain all necessary permits from the San Joaquin Environmental Health Department (SJCEHD) prior to conducting any well destruction activities at the site. ATC will schedule field personnel and equipment, notify Underground Services Alert to locate underground utilities as required, and perform other necessary field preparation and job start-up activities. The proposed work will be performed under the direction of a California Registered Professional Engineer or Geologist. Well Destruction Activities ATC will properly abandon groundwater monitoring wells MW1 through MW6. The locations of the groundwater monitoring and remediation well networks are shown on Figure 2. S:\Enviromenta1\62605-Thiemanns\REPORTS\WP-Well Abandonment 4