ARCHIVED REPORTS_REMEDIAL INVESTIGATION REPORT 2000

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Quarterly Report - November 1999 FORMER CHASE CHEVROLET(MADISON)FACILITY 423 North Madison Street, Stockton,California 1.0. INTRODUCTION At the request of Mr. Jeffery Setness of Jeff B. Setness Professional Law Corp., Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report summarizing field activities performed during the fourth quarter of 1999 at 423 North Madison Street, Stockton,California. The scope of work included monitoring concentrations of dissolved petroleum hydrocarbons in ground water on the site and preparation of this report. The site setting is illustrated in Figure 1 -Location Map. Structures and monitoring well locations are illustrated in Figure 2 - Site Plan. Site background information was summarized in Revised Corrective Action Plan -February 1997, Site Investigation Report- UST No. 8,dated 10 February 1998 and Quarterly Report-August 1998, prepared by AGE. 2.0. PROCEDURES Field activities were performed in accordance with guidelines for investigation of underground storage tank(UST) sites established by the Regional Water Quality Control Board- Central Valley Region (RWQCB-CVR) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD). 2.1. MONITORING WELL PURGE PROCEDURES On 08 November 1999, a Solinst water level meter was used to measure the depth to ground water in 14 monitoring wells at the subject site and in 13 wells at 424 N. Van Buren Street (Van Buren Site)relative to the tops of the well casings.The ground water elevations and hydraulic gradient were determined from these data(Table 1). On 09 November 1999, monitoring wells MW-1, MW-2, MW-4, MW-13, MW-19A MW-19B, MW-20A, MW-20B, MW-21A and MW-21B were purged using a two-stage purge pump. Monitoring was performed in accordance with the revised monitoring schedule established at a 03 April 1998 meeting with the PHS-EHD. The purge pump was decontaminated prior to purging each well by pumping an Alconox solution followed by pumping tap water. Monitoring wells MW-19A, MW-20B and MW-21B were purged dry after approximately 8, 8 and 6 gallons of water, respectively, were removed. Approximately three well-volumes of water (approximately nine to eighteen gallons) were removed from each of the remaining purged wells. Temperature, pH and conductivity of purged water were measured at regular purge-volume intervals using Hydac water analyzer. The recorded field data and logs are included in Appendix A. All purged water was stored in 55-gallon DOT-approved drums on-site. Advanced GeoEnvironmental,Inc.