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• Increase the number of wells monitored during each event to include the wells <br /> outlined in the November 14, 2011 SJCEHD directive and wells within the <br /> influence of the remedial systems. <br /> • Annual groundwater monitoring will also include monitoring of two (2) domestic <br /> wells: DW-31448 HWY 33 and DW-1697 Durham Ferry Road. <br /> • The constituents for analysis will include TPHg, BTEX, MTBE and 1,2-DCA. <br /> The table below indicates which wells will be sampled and which wells will have depth- <br /> to-water measurements collected during each quarter. <br /> Wells 1st QTR 2nd QTR 3rd QTR 4th QTR <br /> (Annual) <br /> MW-I x x x x <br /> MW-2 x x x x <br /> MW-4 x <br /> MW-5 x <br /> MW-7 x x <br /> MW-8 x x <br /> MW-102 x DTW <br /> MW-106 x <br /> ow-1 x x x x <br /> DW-2 x x x x <br /> sW-101 x <br /> MW-2x DTW <br /> MW-202 DTW <br /> MW-101 DTW <br /> MW-201 DTW <br /> DW-31448 RWY-33 x <br /> DW-1697 Durham x <br /> Fe Rd. <br /> The quarterly groundwater monitoring plan will be implemented during the 4th quarter of <br /> 2012 and will continue for one (1) year, as directed in the October 12th, 2012 SJCEHD <br /> email. Reporting of groundwater monitoring and remedial effectiveness data will be <br /> included in the two(2) semi-annual reports to be completed in the 2"d and 4th quarters. <br /> Remedial System Activities <br /> Phase II of the remedial plan was implemented during the 3rd quarter 2012 which <br /> included the installation of a soil vapor extraction (SVE) system and the expansion of the <br /> existing air sparging (AS) system. On June 25th, 2012, three (3) air sparging wells were <br /> installed within the groundwater plume. Between August 20th and 22"d, 2012, GTI <br /> installed the underground trenching to connect the new air sparge wells AS-1, AS-2 and <br /> AS-3 and SVE well VEW-2 to the existing remediation compound. <br /> Operational testing of the expanded remedial systems occurred between August 24d' and <br /> 27th, 2012. Following the operational testing, the AS system continued to operate while <br /> the SVE system was shut down until the permitting process could be completed. An <br /> 3rd QMR 12 letter format.doc 2 of 4 <br />