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I - ` ' Quarterly Report - Fourth Quarter 2000 • Former ARCO MINI-MART ' 4511 Paci is Avenue, Stockton, California ' 1 0 INTRODUCTION AND SCOPE OF WORK I At the request of Mr Art Wyatt,Advanced GeoEnvironmental, Inc (AGE) has prepared this ground water monitoring report for fourth quarter 2000 for the site located at 4511 Pacific Avenue, Stockton California(the site) Figure 1 shows the site location The scope of work included monitoring of the ground water monitoring well network on the site This report documents collection and analysis of ground water samples and the results of a ground water monitoring event I Structures, monitoring well and soil boring locations on and adjacent to the site are illustrated in Figure 2 The site history and a description of previous work performed at the site were detailed in Quarte ly Report-March 1996 dated 30 April 1996, prepared by AGE Findings from the latest soil and grab ground water sampling event were detailed in Quarterly Report -June 1998, prepared by AGE, dated 22 December 1998 Data from previous ground water monitoring events are included in the tables of this report ie 20 PROCEDURES IThirteen ground water monitoring wells were purged and sampled on 24 October 2000 Field procedures were performed in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) guidelines for subsurface investigations of underground storage tank (UST) I sites 2 1 MONITORING WELL PURGE PROCEDURES On 24 October 2000, a Solinst water level meter was used to measure the depth to ground water in I monitoring wells MW l through MW 12 and vapor well V W 1 and wells MW-7 and MW-8 from the Pacific Car Wash investigation After depth to ground water measurements, a minimum of 3 casing-water volumes were purged from eacn welt to be samptea using a PVC, submersible two-stage pump (vapor well VW-1 9 gallons, wells MW-1 22 gallons, MW-2 and MW-3 19 and 20 gallons, MW-4 and MW-5 10 gallons wells MW-6, MW-7 MW-9 MW-10 and MW-I IA 9 gallons, MW-8 and MWI2B 15 gallons, well MW-IIB 13 gallons and well MW-12A 8 gallons) Temperature, pH and conductivity of purged ground water were measured at 3-gallon, 4-gallon, • 5-gallon and 8-gallon intervals, as appropriate for each well using a Hydac water analyzer The field data and field sheets are included in Appendix A Purged water was temporarily stored on-site in 55- Advanced GeoLnvironmcntal Inc