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' Quarterly Report -Fourth Quarter .2063 RIPON FARM SERVICE ' 22871 South Highway 99, Ripon, California ' 1.0. INTRODUCTION AND'SCOPE OF WORK At the request of Mr. Allan Fetters, 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 its surroundings are illustrated in Figure 1. Structures and monitoring and remediation well locations associated with the site are depicted in Figure 2. 1 This report documents the operation an�monitoring of a soil vaporextraction(SVE)vacuumblower from September to December 2003 (stAt of third and fourth quarters), collection and analysis of ' confirmation soil and grab ground water samples,and performance of the fourth quarter ground water monitoring event on 04 November 2003. Background information,including details ofprevious site ' assessment work, was presented in the AGE-prepared Corrective Action Plan, dated 01 June 1999. 2.0. PROCEDURES All field work was performed in accordance with Central Valley Regional Water Quality.Control '. Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites. Soil- vapor extraction monitoring was preformed in accordance with procedures outlined in the Revised Remedial Action Work Plan Addendum and Remedial Action Work Plan, prepared by AGE and ' approved by the San Joaquin County Environmental Health Department (EHD) by letter, dated 21 April 2000. Ground water monitoring and sampling was performed in accordance with the EHD guidelines for the sampling of ground water monitoring wells. 2.1. SOIL-VAPOR EXTRACTIONv`lIliq ' 02.an-4:2Z On 27 October, 19 November,4n4-ft)-and--*1Z December 2003, AGE personnel monitored the SVE vacuum blower system,which consisted of a vapor knockout drum placed in line before the vacuum blower to capture vapor condensate and the vacuum blower unit. Soil vapor extracted by the vacuum blower was exhausted directly into the atmosphere.During each monitoring event,the SVE flow rate ' and concentrations of hydrocarbons in the extracted soil-vapor were measured, and a soil-vapor sample was collected. 2.1.1. Soil Vapor System Monitoring and Sampling ' The flow rate of extracted soil-vapor(influelIt) was measured using a.direct-measure flow meter. A . magnehelic vacuum gauge was used selectively to measure the vacuum potential at the 2-inch influent line between the blower and extraction wells.The organic vapor concentrations in the extracted soil- ' Advanced CeoEnvlronmental,Inc. 1