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' I r r { i 1 I f L Quarterly Report - First Quarter 2000 ' FORMER CHASE CHEVROLET (MADISON) FACILITY 423 North Madison Street, Stockton, California y 1.0 i INTRODUCTION I At the request of Mr `Jeffery Setness of Jeff B Setness Professional Law Corp , Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report summanzing field activities performed during the first quarter of 2000 at 423 North Madison Street, Stockton, California The scope of Mork 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 Remised Cary ectzve Actron Plan - February 1997, Site.Investigation Report- UST No 8, dated 10 February 1998 and Quarles ly Repoi r -August 1998, prepared by AGE 20. PROCEDURES r �r 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 DISPOSAL OF PURGE WATER ' On 08 October 1999, approximately 560 gallons of water previously purged from monitoring«yells - on the site were disposed The purge water was transported by Nor Cal Oil, under hazardous waste manifest, to Silver Springs, Nevada for disposal The manifest is included in Appendix A 2 2 MONITORING WELL PURGE PROCEDURES On 07 February 2000, a Solinst water level meter was used to measure the depth to ground water in 15 monitoring wells at the sub)ect site and in 13 wells at 424 N Van Buren Street (Vara 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 08 February 2000, monitoring wells MW-1, MW-2, MW-4, MW-5, MW-8, MW-11, MW-12 MW-13, MW-18, MW-19A MW-19B, MW-20A, MW-20B, MW-2IA and MW-21B were purged using submersible purge pumps Monitonng`was performed in accordance with the revised monitoring schedule established at a 03 April 1998 meeting with the PHS-EHD The purge pumps r 4dvairced CeoEnN ironmentat,Inc H r