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t L 1 t 1 n 1 A` f 1 , t 1 1 1 I Quarterly Report - September 1998 {_ I r Former STOCKTON PLATING Facility - 632 South El Dorado Street, Stockton, California 1.0. INTRODUCTION ' At the request of Mr Richard Leland of R and L Business Management of Stockton, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report of ground water monitoring activities performed at 632 South El Dorado Street, Stockton, California (the site) This report ' presents ground water monitoring results for September 1998 The site setting is illustrated in Figure 1 The locations of structures and monitoring wells on the site are depicted in Figure 2 ' Background information, including details of previous site assessment work, was presented in the Quarterly'Report-March 1996 dated 05 April 1996, Quarterly Report-June 1995 dated September 1998 and in the Corrective Action Plan -December 1995,prepared by AGE _ t , ' 2.0. PROCEDURES 1 Monitoring and sampling were performed in accordance with guidelines established by the Central Valley Regional Water Quality Control Board(CVRWQCB) and by the San Joaquin County Public , Health Services - Environmental Health Division (PHS-EHD) for the subsurface investigation of underground storage tank (UST) sites I I In addition, as noted below, all field work was conducted in accordance with the PHS-EHD approved Work Plan Addendum, dated 06 June 1998 2 1 MONITORING,WELL PURGING PROCEDURES On 22 September 1998, a Solmst water level meter was used to measure the depth to ground water in all monitoring wells (MW-1 through MW-5) and vapor wells screened in ground water(VW-1 I through VW-4) at the site d I After ground water depth measurements, a mmimum of three well volumes of water was removed from each of wells MW-3, MW4 and MW-5 and VW-1 through VW-4 using a submersible pump , Wells MW-1 and MW-2 were not purged for sampling These wells have screen intervals approximately 15 feet below the upper level of the water table - t Approximately 8 to 60 gallons'of water were removed from each well, according to the purge- volume requirements Temperature,pH, and electrical conductivity were measured in purged water at regular purge-volume intervals using an ICM water analyzer to monitor stabilization of these physical parameters Purge water stabilization field data sheets are included in Appendix A Purged Advanced GcoEnvironmental,Inc.