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't <br /> r t <br /> BROWN AND <br /> C A L D W E L L <br /> o <br /> June 8, 1995 JUN 0 9 1995 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Ms. Mary Meays <br /> San Joaquin County <br /> Public Health Services -z <br /> Environmental Health Division <br /> Post Office Box 388 <br /> Stockton, California 95201 017-2060-01/1 <br /> Subject: ARCO Facility 2133, Site Code 1020' <br /> Dear Ms. Meays: <br /> This letter describes the operating parameters, operating schedule, and dissolved oxygen (DO) <br /> measurements and data collection schedule for the air sparge system at ARCO Products <br /> Company (ARCO) Facility 2133 located at 2908 Benjamin Holt Drive, Stockton, California. <br /> The air sparge system was placed into operation on April 4, 1995. The sparge system has <br /> operated almost continuously except for April 28 through May 3 for system testing, May 15 <br /> through 18 when the vapor extraction system was determined to be operating out of <br /> compliance based on analytical results of air samples collected on May 5, and May 26 through <br /> June 5 because of a faulty sparge blower cooler pump motor. <br /> In our letter to you dated April 4, 1995, the indicated DO monitoring schedule was monthly <br /> beginning with the data collected on March 31, 1995. During our telephone conversation of <br /> April 11, 1995, you indicated that we should monitor the DO bi-weekly beginning that week. <br /> You indicated that the wells to monitor are: MW-1, MW-4, MW-5, E-2 (MW-3 if E-2 is <br /> inaccessible), E-4, E-5, E-9 and E-10. Table 1 presents the DO data collected to date. <br /> On May 15, 1995, ARCO, San Joaquin County; Brown and Caldwell, and EMCON met for <br /> a regularly scheduled quarterly meeting to discuss ARCO facilities in San Joaquin County. <br /> During the May 15 meeting, you requested information on the sparge system operating <br /> parameters. Currently, all nine of the sparge wells are operating. Table 2 presents a summary <br /> of the operating parameters for each of the sparge wells. The sparge wells are operating at <br /> an average pressure of 7.13 pounds per square inch (psi). The average flow rate into each <br /> sparge well is 3.45 cubic feet per minute (cfm): <br /> Environmental Engineering And Consulting•Analytical Services <br /> 06/09/9SE:\2060\CORRESPt2060-Ql. 136 1V1 I C <br /> QMS-PS2200 Y b R 0 N AVENUE, SUITE 600, SACRAMENTO, C A 95 8 27-262 7 <br /> (9 16) 444-0123 FAX (916) 856-5277 <br />