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• Additional Monitoring Well Installation Work Plan GEWEKE PROPERTY 16 South Cherokee Lane, Lodi, California 1.0. INTRODUCTION T '—At-the request of Mr Dale Gillespie of G-REM, Advanced GeoEnvironmental, Inc (AGE} has _ r prepared this Additional Monitoring Welll`nstallation Work Plan for the property located at 16 South Cherokee Lane,Lodi,California(site)and the surrounding area The location of the site is illustrated on Figure 1 A site plan is illustrated on Figure 2 The gasoline additive 1,2-DCA has been detected in"first"groundwater in the down-gradient well MW-16 over the past four quarters and in eastern perimeter well MW-7 over the past six quarters, consequently,the Central Valley Regional Water Quality`Control Board(CVRWQCB),in the letter dated 29 October 2003, has required additional work to define the lateral extent of 1,2-DCA- impacted ground water This work plan details the scope of work for installation, development and quarterly monitoring of two additional ground water monitoring wells, a third well may be installed if analysis of samples from monitoring well MW-11,during the fourth quarter 2003 indicate the presence of 1,2-DCA . This work plan is prepared in accordance with Cleanup and Abatement (C&A) Order No 93-701 and in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites 20 BACKGROUND In 1985,two 10,000-gallon,one 6,000-gallon and one 1,000-gallon underground storage tank(UST) were removed from the site No samples were collected from the tank excavation In October 1985, San Joaquin County required G-REM to conduct a site investigation of suspected leakage from the 1,000-gallon waste oil tank Between 1986 and 2002, thirty-two soil borings, seven vapor extraction wells, one ground water extraction well and nineteen ground water monitoring wells were installed on and near the site Ground water monitoring was conducted at the site by Kleinfelder in 1985, Brown and Caldwell from February 1986 to July 1990,PES Environmental Inc and Blaine Tech Services,Inc from May 1991 to September 1991,Sun Tech Environmental Inc from December 1991 to July 1993,Geologic Audit Services, Inc (GeoAudit) from September 1993 to September 1994 and AGE from March 1995 to the present A Problem Assessment Report(PAR)was prepared by PES Environmental Inc and submitted to the CVRWQCB in July 1991 A Final Remediation Plan (FRP).was prepared by GeoAudit and submitted to the CVRWQCB in July 1993 Advanced GeoEnviron mental,Inc i +