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jaCalifornia Re#nal WaterQuality C trol Board . <br /> Central Valley Region <br /> Tarry Tammmen Robert Schneider Chair <br /> Secretary for Sacramento Main Office Arnold Schwarzenegge <br /> rnnmentai Internet Address httpJ/vvww swrcb as gov/rwgcb5 Governor <br /> otect►on 11020 Sun Center Drove#loo Rancho Cordova,CA 95670-6114 <br /> ' Phone(915)464-3291 <br /> 13 May 2004 <br /> Mr Bob Hopkins Mr Phil Delk Mr Jay Allen <br /> Union Oil Company of California Deputy General Counsel Stone Brothers Management Company <br /> ' 276 Tank Farm.Road Montgomery Wards 1024 W Robinhood Dr <br /> P O Box 1069 535 West Chicago Avenue Stockton, CA 95207 <br /> San Luis Obispo, CA 93406 Chicago, IL 60671 <br /> REPORT REYACIFIC AVENIEW, CLEANUP AND ABATEMENT ORDER No' 5-00-707,FORMER UNOCAL STATION #E5098 AT <br /> SLOG PUE,AND FORMER MONTGOMERY WARDS AUTO SERVICE AT 5400 PACIFICAVENUE, <br /> STOCKTON,SAN JOA QUIN COUNTY, <br /> I reviewed the 30 April 2004 Updated Site Conceptual Model, Monitonng And Remediation Status R <br /> Quarter 2004(Report) submitted by ENSR International Report,Forst <br /> continuing pulsed (ENSR)on behalf of Unocal The Report recommends <br /> ' g p operation of the Air Spargmg(AS) system, and continuing quarterly monitoring <br /> Since the SVE system was shut down, monitoring data and Figure 7 (enclosed) from the Report, with the <br /> ' monitoring data and the three Figure Ts from the three prior quarterly reports(enclosed), show that the B-zone <br /> benzene plume has expanded to the south(laterally)and also to the east(downgradient),beyond the monitoring <br /> well network. The benzene plume in the B-zone has more than doubled in size since last year During the 3'd <br /> quarter 2003, the B-zone benzene plume appears to be migrating laterally to the south During the 4m quarter <br /> 2003, the same plume appears to be migrating downgradient to the east The Report also states that the AS <br /> system operated only 528 hours during the 4`s quarter 2003, and that ENSR will troubleshoot the AS system to <br /> ' reduce downtime <br /> Cleanup and Abatement Order No 5-00-707, Order No 15 states Ifgroundwater monitoring indicates that the <br /> groundwater plume has migrated beyond laterally or vertically defined limits during the quarter, the quarterly <br /> report shall include a workplan and schedule, with work to begin within 30 days of a report submittal, to define <br /> the new plume limits and cease plume movement The Report does not include the Order-specified work plan or <br /> ' schedule to implement the work plan The work plan is now overdue if the work plan is not received by <br /> 15 June 2004,then we may recommend that formai enforcement action be taken <br /> You may call me at(916)464-4615 for questions or additional information <br /> VEgMES L BARTON,R G <br /> ineering Geologist <br /> cc Mr Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Ms Jill Tracy, Esq , UNOCAL,Brea <br /> Mr Ben Henningburg, ENSR International, Sacramento <br /> California Environmental Protection Agency RECEIVED MAY 14 W <br /> Z41 Recycled Paper �'�"l`1 v Q"15— r't J lPI 6 <br />