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Quarterly Monitoring Report - First Quarter 2002 <br /> FIRE STATION #2 <br /> 110 West Sonora Street, Stockton, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of the City of Stockton,Advanced GeoEnvironmental, Inc (AGE)has prepared this <br /> report for corrective action activities conducted at 110 West Sonora Street, Stockton,Cali form a(the <br /> site) The location of the site and Its surroundings are illustrated in Figure 1 Structures and well <br /> locations associated with the site are depicted in Figure 2 <br /> This report documents soil-vapor sampling events on 10 December 2001, 10 January and <br /> 18 February 2002 and a ground water monitoring event on 11 January 2002,and presents the results <br /> of the laboratory analyses of soil-vapor and ground water samples <br /> 2.0 PROCEDURES <br /> I 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 Design Plans and Specifications For Soil and Groundwater Remediation, prepared <br /> by ATC Associates Inc (ATC) and approved by the Sari Joaquin County Environmental Health <br /> Department (EHD) by letter, dated 03 January 2001 <br /> Field procedures for soil-vapor and ground water sampling are described below <br /> SO <br /> 2 1 IL-VAPOR/IN-SITU AIR SPARGING PROCEDURES <br />' A soil vapor extraction/in-situ air sparging system (SVE/IAS) has been in operation since October <br /> 2001 The system was monitored monthly and inspected or maintained weekly during operation <br />' During each monitoring event, measurement of the SVE flow rate, vacuum (potential), <br /> concentrations of hydrocarbons in the extracted soil-vapor and collection of a set of soil-vapor <br /> samples were conducted by AGE personnel <br />' The flow rate of extracted soil-vapor(influent) was measured using an direct measure flow meter, <br /> a magnehehc vacuum gauge was used to measure the vacuum potential at the two inch influent line <br />' The organic vapor concentrations in the extracted soil-vapor stream was measured before entering <br /> the blower (influent stream) and after exiting the carbon units (effluent stream) using an organic <br /> vapor meter(OVM)equipped with a photo-ionization detector PID(Thermo Environmental 580A, <br /> 10 OeV, calibrated to isobutylene 100 ppb) Field measurements, recorded at regular intervals <br /> . between 10 December 2001 and 18 February 2002, are summarized in Table I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />