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Corporate Office <br /> 8774 Yates Drive,Suite 100-Westnulster,Cobrado 30CGo <br /> (30 4774567-Fax 133)327-1953-800283-1945 <br /> Ryan-Mrrpky, Incorporated Divs_aonOfflce <br /> "Me Good Urth Companyo OR* 211 Crarsde Street,Sude E-Corona,Cal ibma 91519 <br /> 09)279-6210- Fax OM T9-b2I5-800.766.1993 <br /> fib <br /> May 18, 1995 <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Public Health Services <br /> P.O. Box 2009 (445 N. San Joaquin Street) <br />' Stockton, CA 95201 <br />' Site: Firestone Store, 400 North El Dorado Street, Stockton, California <br /> Subject: Quarterly Report on Vapor Extraction System Operation <br />' (November 4, 1994 - February 4, 1995) <br /> IDear Mr. Knoll: <br /> As you requested, this letter report contains a brief narrative on the startup and <br />�. subsequent operation of the vapor extraction system (VES) at this site. All vapor off- <br /> gas analytical data from samples collected through February 4, 1995, are attached_ <br /> On November 1 through November 3, 1994, VES installation was completed at the <br /> subject site. Site activity included construction of a (second) vapor extraction well, <br /> construction of four vacuum monitoring points, and installation of the piping and <br /> vacuum system itself. Details of system design and construction can be reviewed in <br /> the Soil Remediation Plan forwarded to San Joaquin County on February 2, 1994. <br /> VES operation was initiated on Friday, November 4, 1994. System operation and <br /> maintenance (O&M) activities were performed by On-Site Technologies, a local <br /> subcontractor out of Campbell, California. As of this time, vacuum has only been <br /> applied to the vapor extraction well screened from 18- to 28-feet below grade in <br /> native soil (VE-1). The system has been operating at an air flow rate of 40-cubic feet <br /> per minute (CFM) since startup. This flow rate has produced a vacuum level at the <br /> extraction point of approximately 16-inches of water column. <br /> The five vacuum monitoring points surrounding the former UST area have been <br /> monitored periodically during system operation. All five monitoring points have <br /> displayed a response to the vacuum level being applied atthe extraction well. Vacuum <br /> levels between 0.5- and 2.5-inches of water have been measured in the monitoring <br /> 4 points, and have remained relatively consistent over time. The difference in vacuum <br /> Los Angeles,Cahforiva San F=csco,Cairfom,a <br /> Undonderry,'Niew Hampshire Va=uvw,British Columbia <br /> Danns.Tares * +' Atlasita.Camp <br /> swats* <br />