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QUARTERLY MONITORING REPORT SECOND QUARTER 1993 ' MAJOR MART PROJECT ' 1.0 INTRODUCTION This report summarizes the results of quarterly groundwater monitoring and the status of remedial activities for the Mayor Mart site located at 1235 East Alpine Avenue in Stockton, California (Figure 1 and Figure 2) The report is organized to address the reporting requirements discussed in the San Joaquin County Environmental Health Division (EHD) letter dated November 12, 1991 to American Real Estate Group (AREG) To respond to EHD's ' requirements, this report is presented in two segments The first segment reports on the results of the second quarter 1993 groundwater monitoring program, while the second segment discusses the status of the overall remedial program Where project historical data is of importance to the ' current status of the project, it is referenced Should users of this report be interested in the overall history of the project, reference should be made to the WESTON Third Quarter 1992 Report dated November 13, 1992 which contained a historical summary of work completed up ' to that time 2.0 GROUNDWATER MONITORING PROGRAM This section presents a summary of the field activities and analytical results of the second quarter 1993 monitoring event along with a historical compilation of analytical data from prior monitoring events The majority of the field work was completed on June 17 and 18, 1993 Monitor well MW-2 was not sampled during this time period because the well was found to be partially filled with gravel from the site restoration phase of the remedial excavation work ; ' completed last quarter Using an air-lift technique, WESTON removed the gravel material from MW-2 on June 28, 1993 and completed the sampling on July 2, 1993 ' 2.1 Field Activity Summary The groundwater monitoring program consists of two aspects 1) field measurement of ' groundwater elevation, temperature, pH and electrical conductivity, and 2) collection of groundwater samples for laboratory analysis All six groundwater monitoring wells at the site were inspected for the presence of floating product and measured for groundwater levels Samples were collected using the procedures detailed in the Field Report presented in Appendix A A sample was also taken of the contents of the holding tank used onsite to collect purge and decontamination rinsewaters from multiple sampling events for eventual disposal All ' samples were submitted to WESTON's Stockton, California analytical laboratory for analysis of total petroleum hydrocarbons as gasoline (TPH-G) by EPA Method 8015-M and BTEX (benzene, toluene, ethylbenzene and xylene) by EPA Method 8020 In past monitoring events, ' the monitor well samples have also been analyzed for total lead and fecal coliform However, / Per discussions with EHD, analysis of these parameters is now only required once annually f/ Hence, the monitor well samples will be analyzed for total lead and fecal coliform only during the third quarter 1993 monitoring event 1 09/0&93' srt,\aprs\aREcaQ'ra WP