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Quarterly Report - November 1998, February 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 ' GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report summarizing field activities performed during the fourth quarter of 1998 and the first quarter of 1999 at 423 North Madison Street, Stockton, California The scope of work included'monitonng 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 the Revised Corrective Action Plan - February ' 1997, the Site Investigation Report- UST No 8, dated 10 February 1998 and the 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 03 November 1998 and 02 February 1999, a Solinst water level meter was used to measure the depth to ground water in fifteen monitoring wells at the site and nine monitoring wells at the Van Buren site relative to the tops of the well casings The ground water elevations and hydraulic ' gradient were determined from these data (Table 2) On 03 November 1998,following measurement of ground water depths, wells MW-1, MW-2, MW- 4, MW-13, MW-19A MW-I9B, MW-20A, MW-20B, MW-2IA and MW-21B were purged using a two-stage purge pump On 02 and 03 February 1999, all monitoring wells at the site 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 during both monitoring events, after approximately five to eight gallons of water was removed Approximately three well-volumes of water, approximately eight to eighteen gallons, were removed from each of Advanced Geairnvironmental,Iac 1