SITE INFORMATION AND CORRESPONDENCE FILE 2

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h I Stantec Quarterly Status Summary Report - Fourth Quarter 2011 ARCO Service Station No. 2130 February 29, 2012 Department (CSMUD), California Water Service (CWS), and the local water purveyors to ascertain the location and pertinent well construction information of nearby wells ; and a 500 foot field reconnaissance to locate and/or confirm the presence of wells or other sensitive receptors. DWR identified no well records within the Township , Range, and Section in which the site is located. The nearest wells identified in DWR records are located approximately 2,200 ft to the northwest of the site . URS contacted CSMUD to ascertain whether they operated any wells in the vicinity of the site. According to CSMUD, there are two city wells operating within 2, 000 ft of the site . City well No. 4 located 1 ,200 ft south-southeast of the site on Segovia Lane is 600 ft deep and has a production capacity of 1 .5 million gallons per day (mgd ). City well No . 12 located 1 ,600 ft south of the site at 341 Leslie Avenue is 410 ft deep and has a production capacity of 0. 82 mgd . Additionally, URS contacted the Stockton office of CWS to ascertain whether they operated any wells in the vicinity of the ARCO site. CWS determined that it does not own or operate any wells within 2, 000 ft of the site. On December 6 , 2004, URS performed a 500 foot field reconnaissance to identify and/or verify the location of wells , water bodies, and schools. No surface water bodies, schools , or wildlife habitats were identified within 500 ft of the site. The nearest school identified is Pulliam Elementary, located approximately 1 ,300 ft southeast of the site. � Monitoring and Sampling E The site is sampled semiannually during 1Q and 3Q. No groundwater monitoring or sampling was conducted during 4Q11 . i Current Assessment Activities No assessment activities were conducted during 4Q11 . Remediation Status There is currently no active remediation being conducted at the site. Waste Disposal Summary No waste was generated during 4Q11 . Recent Correspondence No correspondence was received during 4Q11 . This Quarters Activities (Fourth — 2011) 1 . Stantec prepared and submitted the SMR 3Q11 on November 15, 2011 . f Next Quarter's Activities (First — 2012) f 1 . Stantec will prepare and submit the QSSR - 4Q11 , 4 2 . Stantec will perform the semiannual groundwater monitoring and sampling event. t3. Stantec will initiate the scope of work described in Stantec's Hydrogen Peroxide Injection Work Plan dated July 27 , 2011 once appropriate permits are obtained . i E 2130 QSSR 4Q11 .doc 2 6