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Quarterly Report - Second Quarter 2006 RIPON FARM SERVICE, INC. 22871 South Highway 99, Ripon, California 1.0. INTRODUCTION At the request of 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 and monitoring well locations associated with the site are depicted on Figure 2 This report documents the ground water sampling activities conducted on 15 May 2006 The Central Valley Regional Water Quality Control Board (CVRWQCB) directed Ripon Farm Service (RFS) to conduct a ground water 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 was presented in previous quarterly reports 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 Ground water monitoring activities were conducted on 15 May 2006, monitoring wells MW-101 through MW-104, and MW-5, MW-7, MW-9 and MW-10 were monitored and sampled 21 WELL MONITORING AND EVACUATION AND SAMPLING/ANALYSIS Prior to purging, depth to water measurements were obtained from wells MW-5, MW-7, MW-9, MW-10 and MW-101 through MW-104 using a Solinst water level meter After ground water depth measurements, wells MW-5, MW-7, MW-9 and MW-10 were purged of approximately 3 5 to 5 gallon or three casing volumes of water using dedicated,disposable bailers Wells MW-101 through MW-104 were purged of approximately 5 to 8 gallons (or three casing volumes) using a Waterra inertial pump, dedicated %-inch diameter polyethylene tubing and a check valve During purging of each well, extracted water was monitored for temperature, pH, and conductivity at regular intervals during purging using an Oakton water analyzer Field sheets and data are • Advanced GcoEnvironmental,Inc