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f . Quarterly Report - Second and Third Quarters 2003 SHOCKEY AND SONS TRUCKING 850 Milgeo Avenue, Ripon, California 1.0 INTRODUCTION At the request of Mr Lee Shockey, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 850 Milgeo Avenue, Ripon, California (site) The scope of work included the monitoring of five ground water monitoring wells in May and June 2003 (second and third quarter) ' and operation of an ozone-sparging system at the site The location of the site and its surroundings are depicted in Figure 1 Monitoring and ozone sparge wells,probe boring locations and structures on the site are shown in Figure 2 1 This report has been prepared in accordance with the Central Valle Re conal Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank(UST) sites Site ' history and findings from previous investigations and previous monitoring events at the site are summarized in Appendix A Quarterly monitoring data from April 1996 to the present is summarized in Tables 1 and 2 of this report 1 2 0. PROCEDURES On 28 and 29 October 2002,AGE installed one monitoring well and three ozone sparging wells at the site as proposed in Additional Site Assessment and Feasibility Study Work Plan, dated 07 June 2002 and approved by the EHD by letter dated 24 June 2002 AGE initiated an ozone sparging pilot test at the site in early Apri12003 to evaluate and potentially mitigate the dissolved TPH-d in the 1 former UST area Field work was performed in accordance with guidelines developed by Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites ' Ground water momtonng activities conformed to guidelines issued by the San Joaquin County Environmental Health Department(EHD) On 13 May and 19 June 2003, ground water monitoring ' activities were conducted on wells MW-i through MW-5, however, well MW-4 was not sampled during the May monitoring event at the request of Mr Harlin Knoll of the EHD ' 21 IN-SITU OZONE SPARGING PILOT TEST An ozone-sparging system for in-situ oxidation was installed at the site on 20 January 2003 and operatedcontinually from 31 March to 10 July 2003, the system was shut down in July after significantly increasing concentrations of TPH-d were detected over two consecutive quarters in the ' monitoring well at the UST location (MW-4) and the off-site well MW-1 1 Advanced GeoEnvironmental,Inc