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Quarterly Report - First and Second Quarters 2002 • VAN BUSKIRK GOLF COURSE FACILITY 1740 Houston Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of the City of Stockton,Advanced GcoEnvironmental, Inc. (AGE) has prepared this ' quarterly report for the Van Buskirk Golf Course maintenance facility(site)located at 1740 Houston Avenue, Stockton, California (Figure 1). The work included installation of three soil borings, ,. collection of grab ground water samples, completion of two borings as ground water monitoring ' wells, and collection of ground water samples from the newly installed wells to assess the impact of petroleum hydrocarbons and fuel oxygenating compounds on ground water beneath the site. . This report is prepared in accordance with guidelines established in Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991, prepared by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of UST sites. Site background ' information was summarized in the'AGE-prepared Additional Soil and Ground Water Assessment Work Plan, dated 31 July 2000, which was approved by the San Joaquin County - Environmental Health'Department (EHD) by letter dated 04 August 2000. 2.0. . PROCEDURES The work was conducted as outlined in the AGE work plan titled Work Plan Addendum, dated 19 ' November 2001 and approved by the EHD on 06 December 2001,-and was performed in accordance with EHD guidelines for ground water monitoring well sampling and CVRWQCB guidelines for investigation of underground storage tank (UST) sites. The following is a chronology of the investigation: • On 18 and 20 February 2002, soil boring B8 was advanced at the site,near wells MW-4 and ' MW-6,to discrete depths of 60 feet below surface grade(bsg)and 71 feet bsg to collect grab ground water samples; the boring was abandoned and grouted on 23 February. ' On 20 February, soil boring B9 was advanced at the site near wells MW-7 and MW-8 to,a depth of 60 feet bsg to collect a grab ground water sample; on 23 February, soil boring 89 was advanced to a depth of 70 feet bsg and completed as depth discrete monitoring well. ' On 08 March 2002, one additional monitoring well (MW-10) was installed east of the co- locatedB9, MW-8 and MW-9; this well was installed to depth of 55 feet bsg. ' The two new wells were developed on 21,March and purged and sampled on 04 April 2002. ' Advanced GeoEnvironmental,Inc.