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rr{q <br /> irr Quarterly Report - First and Second Quarter 2000 <br /> u.sr.j ELK-HORN COUNTRY CLUB <br /> 1 1050 Elkhorn Drive, Stockton, California <br /> 1.0. INTRODUCTION <br /> :. At the request of Mr. Bob Young of Elkhorn Country Club, Advanced GeoEnvironmental, Inc. <br /> '> (AGE) has prepared this Quarterly Report of field activities performed during the first and second <br /> quarters of 2000 at 1050 Elkhorn Drive,Stockton, California (the site). <br /> -:j The scope of work included operation and monitoring of an in-situ soil vapor extraction combined <br /> with air sparging (SVEIAS) system during the time period at the site. In addition, gauging the depth <br /> to ground water, purging of standing water and sampling of existing six monitoring wells and two <br /> air sparging wells were also performed as apart of the scope of work. <br /> The site and its surroundings are illustrated in Figure 1: Structures and ground water monitoring well <br /> locations on the site are depicted in Figure 2. Site history and findings from previous investigations <br /> and monitoring events at the site are detailed in Corrective Action Plan - 27 June 1996 (CAP) and <br /> in Quarterly Report - December 1996, dated 28 February 1997, prepared by AGE. <br /> 2.0. PROCEDURES <br /> Monitoring and sampling were performed in accordance with guidelines established by the Central <br /> Valley Regional Water Quality Control Board(CVRWQCB) and by the San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS-EHD) for subsurface investigation of <br /> underground storage tank sites. Additionally the scope of work was performed in accordance with <br /> the PHS-EHD approved Remedial Action Work Plan Addendum for corrective action prepared by <br /> AGE, dated 14 January 1998. <br /> 2.1. MONITORING OF SVE/AS AND COLLECTION OF SOIL VAPOR SAMPLES <br /> The SVE/AS system was installed during the second and third quarters of 1999 and has been in <br /> operation since September 1999. The system has been monitored weekly since its inception.For each <br /> ^ monitoring event the flow rate of extracted vapors is measured using a Dwyer differential pressure <br /> flow meter. Organic vapor concentrations in the extracted vapor stream are measured before entering <br /> the blower (influent stream), between the carbon canisters and after exiting the canisters (effluent <br /> stream) using an organic vapor meter equipped with a photo-ionization detector (PID: Thermo <br /> Environmental 580A, 10.OeV, calibrated to isobutylene). <br /> The sparging flow rate was adjusted to approximately 8 sefm and at a minimum pressure of 10 to <br /> 12 psi. The depth to ground water and percentage of dissolved oxygen were measured for each . <br /> :_'•' monitoring well on a periodic basis. <br /> Advanced GeoEnviron mental,Inc. <br /> -I <br />