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Quarterly Report - November 1999 . ' FORMER CHASE CHEVROLET (MADISON) FACILITY ' 423 North Madison Street, Stockton, California ' I.O. INTRODUCTION At the request of Mr Jeffery Setness of Jeff B Setness Professional Law Corp , Advanced ' Geo Environmental, Inc (AGE) has prepared this quarterly report surnmanzing 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 r 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 '•1 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) 1 21 MONITORING WELL PURGE PROCEDURES ' November 1 a olinst water level meter was used to measure the depth to ground water On 08 Nove be 999, S p 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 1 Advanced GeoEnviron mental,Inc 1 ,