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Groundwater Monitoring <br /> Report for the Semiannual <br /> ARCADIS Period from January 1 <br /> through June 30,2012 <br /> Lincoln Center,Stockton, <br /> California <br /> 1. Introduction <br /> On behalf of the Lincoln Center Environmental Remediation Trust("the Trust"), <br /> ARCADIS U.S., Inc. (ARCADIS)has prepared this groundwater monitoring report,which <br /> summarizes groundwater monitoring activities conducted between January 1 and June <br /> 30,2012("the reporting period")at the Lincoln Center site,located in Stockton, <br /> California("the Site", as defined in the Amended First Final Consent Decree Order, <br /> Judgment and Reference to Special Master,filed with the Court on June 4, 1999). <br /> This report comprises the components listed below. <br /> • Section 1 presents an overview of the Site and the groundwater monitoring <br /> programs, and includes a summary of additional monitoring activities completed <br /> during the reporting period that were outside of the groundwater monitoring <br /> schedule approved by the California Regional Water Quality Control Board <br /> (RWQCB), Central Valley Region. <br /> • Section 2 presents the groundwater monitoring activities conducted in accordance <br /> with the RWQCB-approved monitoring schedule,including: <br /> - Section 2.1: results of the groundwater level measurements collected on <br /> June 11 and 13, 2012; <br /> - Section 2.2:groundwater sampling methodology; <br /> - Section 2.3:analytical results for the groundwater samples collected from <br /> monitoring wells on June 27,2012, including the results of Phase V Interim <br /> Remedial Action(IRA)performance monitoring conducted to evaluate the <br /> effectiveness of enhanced reductive dechlorination(ERD)at the Site;and <br /> - Section 2.4: quality assurance/quality control(QA/QC)sample review of the <br /> laboratory results. <br /> • Section 3 presents an overview of the groundwater activities, including sampling <br /> frequency, planned for the next semiannual period. <br /> 1.1 Site Location <br /> The Site is a retail shopping center of approximately 30 acres.As illustrated on Figures <br /> 1 and 2,the Site is bounded on the west by Gettysburg Place,on the east by Pacific <br /> ,nr_u„Ao,_GW,{",ptt-Eraro6]SO.tloc 1 <br />