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2121 N. California Blvd., Suite 500 . Walnut Creek, CA 94596 . (925) 941-3700 . Fax (925) 979-9781 • www.parsons.com <br />Mr. Gerald Djuth <br />California Regional Water Quality <br />Central Valley Region <br />11020 Sun Center Drive #200 <br />Rancho Cordova, CA 95670-6114 <br />Subject: Request for Revision of Gr( <br />Semiannual Monitoring <br />Applied Aerospace Structul <br />3437 South Airport Way, S <br />Reference: Monitoring and Reporting <br />Applied Aerospace Structz <br />Letter from Wendy L. Cob <br />William Barber, Group Er <br />company), Cuyahoga Heig <br />Dated: 27 March 2003 <br />Dear Mr. Djuth: <br />The purpose of this letter is to request i <br />Program (MRP) for the Applied Aerc <br />Atlantic Richfield Company, a BP aff <br />quarterly sampling of seven (7) monitor <br />and annual sampling of 12 and 13 <br />Groundwater monitoring reports are sub <br />Concentration trends in monitoring v <br />stable or declining for many years. In <br />groundwater extraction system is co <br />supporting data and a rationale for char <br />MONITORING HISTORY <br />From September 1996 to November <br />according to the first groundwater saml <br />5/5R, 6, and 7) were sampled quarterly <br />were installed in 1998 (MW -8 througl <br />years during this period. In 1998 the <br />background wells (MW -1 and MW -2) <br />ovember 25, 2009 IRt-MVED <br />NOV 3 0 2009 <br />ENpERl��SERUICES HEALTH <br />Monitoring Requirements, <br />California <br />R5-2003-0703, BP Chemicals Inc. / <br />)ration, Stockton, San Joaquin County. <br />mia RWQCB, Central Valley Region to <br />tal Management Company (a BP affiliated <br />isions to the current Monitoring and Reporting <br />,ace Structures Corporation site on behalf of <br />ited company. The current program includes <br />g wells in May and November and semiannual <br />yells in February and August, respectively. <br />tted semiannually. <br />and extraction wells have been consistently <br />ition, water levels continue to indicate that the <br />[ling plume migration. This letter provides <br />the program to semiannual monitoring only. <br />1, groundwater monitoring was conducted <br />plan (Parsons, 1997). Five wells (MW -3, 4, <br />ighout this 5 -year period and seven wells that <br />J-14) were sampled for a minimum of three <br />RWQCB approved the removal of the two <br />the sampling program in 1998 based on the <br />1 of 6 <br />