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d � Quarterly Report - Second Quarter 2006 • RIPON FARM SERVICE INC. 22871 South Highway 99, Ripon, California 1.0. INTRODUCTION At the request of Mr Allan Fetters (Ripon Farm Service Inc ),Advanced GeoEnvironmental, Inc (AGE)has prepared this report of environmental activities conducted at 22871 South Highway 99, Ripon,California(the site) The location of the site and surrounding area are illustrated on Figure 1 Structures,monitoring wells and remediation well locations associated with the site are depicted on Figure 2 .SA , 1 This report documents the ground water sampling activities conducted on 10 February 2006, 22 ,� February 2006, 07 March 2006, and the quarterly ground water monitoring conducted on 06 Apnl-� 2006 The Central Valley Regional Water Quality Control Board(CVRWQCB)directed Ripon Farm Service (RFS) to conduct a groundwater investigation at the RFS facility (CVRWQCB, July 16, 2004) The objective of the investigation was to determine if activities at the RFS facility have contributed to high nitrate concentrations reported in the on-site domestic well and City of Ripon Municipal Water Supply Well MW-12 The work was performed in accordance with procedures outlined in Monitoring Well Installation Work Plan, dated 30 August 2004 and approved by the CVRWQCB by letter dated 22 October 2004 Background information,including details of previous site assessment work, is presented in Appendix A This report is prepared in accordance with CVRWQCB guidelines by a Professional Geologist as defined in Chapter 12 5 Article 4, Section 7850 of the Business and Professions Code 2.0. PROCEDURES The monitoring and sampling of ground water monitoring wells were performed in accordance with CVRWQCB guidelines Quarterly ground water monitoring activities were conducted on 06 April 2006,monitoring wells MW-101 through MW-104,and MW-5 were monitored and sampled Also included in this report are sampling events that took place on 10 February, 22 February, and 07 March 2006 21 WELL MONITORING AND EVACUATION AND SAMPLING/ANALYSIS February 10, 2006 Sampling Event On 10 February 2006 monitoring wells MW-1 through MW-10 were purged and sampled as part of the on-going petroleum hydrocarbon underground storage tank investigation At that time, samples were also collected and submitted for analysis for nitrate as nitrogen(NO3-N)in accordance with EPA methods EPA 300 0 or 300 1 Prior to sampling, depth-to-water measurements were obtained and each well was purged of at least three casing volumes of water prior to sampling The Advanced GeoEnvironmental,Inc.