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1 <br /> Quarterly Report - Third Quarter 2001 <br /> ' FORMER CHASE CHEVROLET (MADISON) FACILITY <br /> 423 North Madison Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' At the request of Mr JefferyB Setness of Jeffrey B Setness Professional Law Corp , Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this quarterly report surr naming field activities <br /> performed during the third quarter of 2001 at 423 North Madison Street, Stockton, California The <br /> scope ofwork performed on the site for the quarter included monitoring concentrations of dissolved <br /> petroleum hydrocarbons in ground water on the site and preparation of this report The site setting <br /> is illustrated in Figure 1 Structures and monitoring well locations are illustrated in Figure 2 <br /> ' Site background information was sununanzed in Revised Corrective Action Plan-February 1997, <br /> Site Investigation Report- UST No 8, dated 10 February 1998 and Quarterly Report-August 1998, <br /> ' prepared by AGE <br /> ' 2.0. PROCEDURES <br /> '• On 16 August 2001,depth to water was measured in ground water monitoring wells MW-1, MW-2, <br /> MW-4, MW 5, MW-8, MW-11, MW 12, MW-13, MW-19A, MW-19B, MW 20A, MW-20B, <br /> MW-21A and MW-21B A vehicle parked over 1\4W-18 prevented measuring depth to water <br /> ' Additionally, ground water samples were collected from wells MW-1, MW-2, MW-4, MW-13, <br /> MW-19A, MW 19B, MW-20A, MW-20B, MW-21A and MW-21B in accordance with the revised <br /> monitoring schedule established at a 03 April 1998 meeting with the San Joaquin County Public <br /> ' Health Services - Environmental Health Division(PHS-EHD) <br /> Field activities were performed in accordance with guidelines established by the Regional Water <br /> ' Quality Control Board- Central Valley Region (RWQCB) and by the PHS-EHD for investigation <br /> of underground storage tank(UST) sites and sampling of ground water monitoring wells <br /> ' 2 1 MONITORING WELL PURGE PROCEDURES <br /> ' A Solinst water level meter was used to measure the depth to ground water in 14 monitoring wells <br /> at the subject site relative to the tops of the well casings The ground water elevation, flow direction <br /> and hydraulic gradient were determined from these data(Table 1) <br /> After depth to water measurements were recorded, the wells to be sampled were purged using <br /> submersible purge pumps The purge pumps were decontaminated prior to purging each well by <br /> ' pumping an Alconox solution followed by pumping tap water Approximately three casing-water <br /> • volumes of water (approximately five to eighteen gallons) were removed from each of the purged <br /> ' wells Temperature, pH and conductivity of purged water were measured at regular purge-volume <br /> Advanced GeoEnvironmentaL Inc <br /> 1 ` <br />