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Geological Technics Inc. <br /> 1172 Kansas Avenue <br /> Modesto,Califomia 95351 <br /> (209)5224119/Fax(209)522-4227 <br /> www.atienv.com <br /> October 12, 2012 <br /> Project No.: 425.2 <br /> Project Name: George's Service VL r <br /> Ms. Vicki McCartney 1 n,l rv 46' <br /> San Joaquin County Environmental Health Department V� <br /> 600 East Main Street <br /> Stockton, C_ A 95202 / <br /> RE: Increased Groundwater Monitoring <br /> George's Service, 1600 Durham Ferry Road, Tracy, CA <br /> Hello Vicki: <br /> Phase 11 of the remedial action plan has been installed and both a soil vapor extraction and air <br /> sparging system are currently operating at the George's Service site (Site). In a letter dated <br /> November 14, 2011, SJCEHD concurred with GTI to increase the groundwater monitoring wells <br /> following the implementation of Phase II remedial system install and start up. Geological <br /> Technics Inc. recommends increasing the groundwater monitoring starting in the 4's Quarter of <br /> 2012, in order to expand the minimal groundwater monitoring data and monitor the performance <br /> of the remedial system. A change order has been submitted to the Fund requesting that more <br /> funds be allocated to increase the groundwater monitoring scope and frequency and further <br /> expand the air sparging system. <br /> To increase the groundwater monitoring scope and frequency and expand the Site's groundwater <br /> monitoring data, GTI recommends the following: <br /> 1. Increase groundwater monitoring from annual to quarterly. -- ri p <br /> 2. Increase the number of wells monitored during each event to include the wells�outlined in the <br /> November 14, 2011 SJCEHD directive and wells within the influence of the remedial <br /> systems. <br /> 3. Annual groundwater monitoring will also include monitoring of two domestic wells: DW- <br /> 31448 HWY 33 and DW-1697 Durham Ferry Road. <br /> 4. The constituents for analysis will remain TPHg & BTEX. MTBE has been eliminated since <br /> it is not found in concentrations exceeding drinking water standards except in MW-2. <br /> The table below indicates which wells will be sampled and which wells will have depth-to-water <br /> measurements collected during each quarter. <br />