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California — gional Water Quality Con -1 Board <br /> Central Valley Region ' °l <br /> } <br /> Katherine Hart,Chair :° <br /> Linda S.Adams Arnold <br /> S'ecreta�jot 11020 Sun Center Drive#2(10.Rancho Cordova,California 95670-6114 <br /> Phone(916)464.-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental Governor <br /> Protectionhttp://www.waterboards.ca.gov/centraIvaIley <br /> 22 September 2010 RECEARE0 <br /> SEP242010 <br /> Mr. Joe Aldridge EN1 UNIVIENTHEALTH <br /> NuStar Energy L.P. KRMIT/SERVICES <br /> 2330 North Loop 1604 West <br /> San Antonio, TX 78278 <br /> GROUNDWATER MONITORING REPORT SECOND QUARTER 2010, NUSTAR <br /> TERMINALS STOCKTON FACILITY, 2941 NAVY DRIVE, STOCKTON, SAN JOA QUIN <br /> COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff reviewed the 26 July 2010 Groundwater Monitoring Report, Second Quarter 2010 <br /> (Second QMR) submitted by Ash Creek Associates, Inc. (Ash Creek) on behalf of NuStar <br /> Terminals Operating Partnership L.P. (NuStar) for the NuStar Terminals Stockton Facility <br /> located at 2941 Navy Drive in Stockton (Site). Groundwater monitoring at the Site is <br /> conducted pursuant to Monitoring and Reporting Program No. R5-2007-0818 (MRP). <br /> NuStar and its predecessor have conducted monitoring at the Site since 1992. Groundwater <br /> bearing strata underlying the Site have been subdivided into four progressively deeper units <br /> designated zones A through D by NuStar's predecessors and other responsible parties at <br /> neighboring sites. Based on an investigation NuStar conducted during the Fall of 2008, <br /> however, NuStar revised the zone designations and no longer includes a B-zone <br /> isoconcentration map of constituents of concern (COCs) in the quarterly reports. <br /> During the second quarter of 2010, depth to groundwater varied from about two to nine feet <br /> below ground surface (bgs), and groundwater generally flowed to the south-southeast. <br /> ST/MW-1 contained the highest concentrations of total petroleum hydrocarbons as gasoline <br /> (TPHg) at 110,000 micrograms per liter (pg/L), methyl tertiary butyl ether (MTBE) at <br /> 250,000 pg/L, and benzene, toluene, ethylbenzene, and total xylenes (BTEX) at 22,000 pg/L, <br /> i2,000 pg/L, 2,700 pg/L, and 13,000 pg/L, respectiveiy. PS/MVV-14 contained the maximum <br /> concentrations of TPH as diesel (TPHd) at 26,000 pg/L. The last observation of free phase <br /> product occurred in PS/MW-14 in 2007. These results are consistent with historical results. <br /> The 25 March 2010 Work Plan for D-Zone Monitoring Well Installation (Work Plan) proposed <br /> to install two groundwater monitoring wells (ACA-3D and ACA-5D) to 72 and 87 feet bgs, <br /> respectively. Our 8 April 2010 letter requested that Nustar submit a well installation report and <br /> sampling results for these two wells by 1 August 2010. Communications with Ash Creek on <br /> NuStar's behalf indicated that funding constraints delayed commencement of the field work, <br /> and technical difficulties further delayed development and sampling of the wells. <br /> Consequently, the due date for the report has been extended to 15 November 2010. <br /> California Environmental Protection Agemr y <br /> p�� Rec,vcled Paper <br />