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LCalifornia Regional Water Quality Control Board <br />Central Valley Region <br />Steven T. Butler, Chair Gray Davis <br />Winston H. Hickox Governor <br />Secretary for Sacramento Main Office <br />Environmental Internet Address: http://www.s\vrcb.ca.gov/—rwgcb5 1 <br />Protection 3443 Routier Road, Suite A, Sacramento, California 95827-3003 C I D <br />Phone(916)255-3000 • FAX (916) 255-3015 U llECI � <br />21 January 2003 <br />Mr. William Barber <br />BP Oil Company <br />4850 East 49th Street <br />Cuyahoga Heights, Ohio 44125 <br />JAN 2 3 2003 <br />ENVIRORMENT HEALTH <br />PERMIT/SrERVICES <br />REVISION OF GROUNDWATER MONITORING REQUIREMENTS AND <br />IMPLEMENTATION OF CONTINGENCY PLAN, BP OIL COMPANY/APPLIED <br />AEROSPACE STRUCTURES CORPORATION, STOCKTON, SAN JOAQUIN COUNTY <br />I have reviewed the 4 December 2002 Request for Revision of Groundwater Monitoring Requirements <br />(Request) for the BP Oil Company/Applied Aerospace Structures Corporation (BP/AA) site in <br />Stockton. The groundwater at this site is polluted with volatile organic compounds (VOCs) including <br />trichloroethylene (TCE), and 1,1-Dichloroethylene (1,1-DCE). You have completed soil remediation <br />at the primary source area using a soil vapor extraction system, which was decommissioned in <br />December200 I. Groundwater is being remediated with a groundwater extraction and treatment <br />(GWETS). The Request proposes removing monitoring wells MW -3, MW -7 and MW -8 from the <br />monitoring program, and changing MW -10 and MW -11 to annual monitoring. My review of the <br />submitted data supports making some of the requested changes, as discussed below. Enclosed for your <br />review and comment is a draft Monitoring and Reporting Program (MRP), which specifies the wells to <br />be sampled, analytical methods, maximum detection limits, and reporting requirements. <br />Revisions to Monitoring Plan <br />1. MW -3: The Request proposes eliminating this well from the monitoring program because volatile <br />organic compounds (VOCs) have not been detected in this well since November 2000, and only low <br />levels of VOCs were detected in it before November 2000. MW -3 is cross gradient from the source <br />area and upgradient from the extraction wells. This well will be dropped from the monitoring program <br />while the GWETS is operating. <br />2. MW -8: The Request proposes eliminating this well from the monitoring program because a VOC, <br />1,1-DCE, was detected only once, in August 1998. MW -8 is cross gradient to the source area and <br />upgradient from the extraction wells. This well will be dropped from the monitoring program while <br />the GWETS is operating. <br />3. MW -7: The Request proposes eliminating this well from the monitoring program because low <br />levels of VOCs were detected only one time during five years of sampling (May 2000). MW -7 is in a <br />deep water -bearing zone near MW -10, which monitors the intermediate water -bearing zone and <br />continues to contain trace amounts of VOCs. MW -7 is currently monitored on a semi-annual basis. <br />California Environmental Protection Agency <br />0a Recycled Paper <br />