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Remedial Investigation/Feasibility Study Work Plan Addendum . FLAG CITY CHEVRON 6421 Capitol Avenue, Lodi, Califorma 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc (AGE) has prepared this work plan addendum for installation of two ground water observation wells and performance of a ground water aquifer pump test at 6421 Capitol Avenue (site), Lodi, California It is AGE's plan to install the observation wells in such a manner that there will be the option of converting the observation wells to ground water extraction wells at a later date The location of the site is illustrated in Figure 1 A plan of the site is illustrated on Figure 2 On 01 March 2000, the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) directed by Cleanup and Abatement Order No 5-00-700 that a Final Remediation Plan (FRP)be submitted to the RWQCB-CVR by 31 July 2000 for the cleanup of impacted soil and ground water at the site In order to design an appropriate remediation system for the FRP (i e ground water"pump and treat"), AGE believes an additional aquifer pump test is necessary to better predict achievable zones of capture (radius of influence) during ground water extraction activities at the site This Remedial Investigation/Feasibility Study Work Plan Addendum is prepared in accordance with Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) guidelines for the investigation of underground storage tanks (UST) sites I 2 0. SCOPE OF WORK AGE proposes to drill and install one four-inch diameter ground water observation well screened between 15 feet and 35 feet bsg(shallow well) and one additional four-inch diameter ground water observation well screened between 40 and 50 feet bsg (deep well) Following installation of the wells, a 24-hour aquifer pump test will be conducted at the site to better predict a general radius of influence during ground water extraction activities The shallow well will be utilized as the extraction point during the 24-hour aquifer pump test, the deep well will be utilized as an observation point during the 24-hour pump test and to monitor methyl tertiary butyl ether (MTBE) concentrations in the deeper zone AGE proposes to conduct an eight-hour aquifer pump test following the 24-hour pump test to better predict a general radius of influence in the deeper zone during ground water extraction activities and to monitor hydraulic communication between the shallow and deep zones The eight-hour pump test will utilize the deep well as the extraction point and the shallow well as an observation point Ground water deeper than 60 feet bsg in the area of the proposed wells is not currently impacted by MTBE Advanced CcoEnuronmental,Inc