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Quarterly Report - March 1999 CHAPIN BROTHERS, INC. 1766 Monte Diablo Avenue, Stockton, California 1.0. INTRODUCTION At the request of Mr. Russell Chapin,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California. The work completed included quarterly ground water monitoring activities conducted on 30 March 1999. Soil and ground water remediation activities at the site are on-going. The site setting is illustrated in Figure 1. Structures and well locations on or near the site are illustrated in Figure 2. Site history and findings from previous investigations and monitoring events at the site are summarized in Problem Assessment Report (PAR) prepared by Science & Engineering Analysis Corporation(SEACOR) dated 22 July 1994 and in the Quarterly Report-September 1995,prepared by AGE, dated 03 October 1995. 2.0. PROCEDURES Ground water monitoring activities were performed in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) and were performed in accordance with the approved Work Plan Addendum, dated 07 April 1997. 2.1. MONITORING WELL PURGE PROCEDURES On 30 March 1999, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-6, and vapor wells VE-6 and VE-7, relative to the tops of the well casings. (Table 1). After recording the depth to ground water measurements, monitoring wells MW-1 through MW-6 and vapor wells VE-6 and VE-7 were purged using a two-stage purge pump. A minimum of three well volumes of water was removed from near the top of the water in each well. Temperature, pH and conductivity of purged ground water were measured at two-gallon(MW-2 through MW-6, VE-6 and VE-7)and measured at five-gallon(MW-1) intervals using an ICM model 52200 water analyzer. Dissolved oxygen measurements of ground water were collected using a YSI-55 dissolved oxygen meter. The purge pump was washed in an Alconox solution and rinsed with tap water prior to purging each well. Purged water was stored in 55-gallon drums on the site. Field measurements of purged ground water are included in Appendix A. Advanced GcoEnvironmental,Inc.