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' Quarterly Report - Third Quarter 2002 <br /> RIPON FARM SERVICE <br /> ' 22871 South Highway 99, Ripon, California <br /> 10. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Mr Allan Fetters, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> ' report of corrective action activities conducted at 22871 South Highway 99, Ripon, California(the <br /> site) The location of the site and its surroundings are illustrated in Figure 1 Structures and <br /> tmonitoring and remediation well locations associated with the site are depicted in Figure 2 <br /> This report document a ground water monitoring event conducted on 19 September 2002, and the <br /> ' operation, maintenance and monitoring of an in-situ air-sparging (IAS) and soil vapor extraction <br /> (SVE)system from July to September 2002 Background information,including details of previous <br /> site assessment work, was presented in the AGE-prepared Corrective Action Plan, dated <br /> ' 01 June 1999 <br /> ' 2.0. PROCEDURES <br /> All field work was performed in accordance with Central Valley Regional Water Quality Control <br /> ' • Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Soil- <br /> vapor extraction and in-situ air sparging monitoring were preformed in accordance with procedures <br /> outlined in the Revised Remedial Action Work Plan Addendum and Remedial Action Work Plan, <br /> ' prepared by AGE and approved by the San Joaquin County Environmental Health Department <br /> (EHD) by letter, dated 21 April 2000 <br /> 21 SOIL-VAPORAN=SITU AIR SPARGING - - - -- - <br /> A soil vapor extraction/in-situ air spargmg system (SVE/IAS) has been in operation since <br /> December 2000 The system was monitored monthly during operation and after re-start events <br /> ' During each monitoring event, the SVE flow rate, vacuum (potential) and concentrations of <br /> hydrocarbons in the extracted soil-vapor were measured and a set of soil-vapor samples were <br /> collected by AGE personnel In addition, the dissolved oxygen in the ground water wells was <br /> ' measured to monitor the efficiency of the IAS system <br /> ' 2 1 1 Soil Vapor System Monitoring and Sampling <br /> A magnehelic vacuum gauge was used to measure the vacuum potential at the two inch influent line <br /> ' between the blower and extraction wells, the flow rate of extracted soil-vapor (influent) was <br /> measured using an direct measure flow meter The organic vapor concentrations in the extracted soil- <br /> vapor stream was measured before entering the blower(influent stream)and after exiting the carbon <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />