Laserfiche WebLink
California h--Yional Water Quality Conti Board <br /> N - Central Valley Region <br /> k <br /> Katherine Hart,Chair <br /> Arnold <br /> Linda S.Adams 11020 Sun Center Drive 4200,Rancho Cordova,Calitomia 95670-6114 <br /> Schwarzenegger <br /> Secretaryfor <br /> Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Environmental http://www,waterboards.ca.gov/centralvalley <br /> Protection <br /> 8 April 2010 <br /> r'� q 9 ZU10 <br /> Ms. Vicki Goodenow <br /> NuStar Energy L.P. E(`,V�{(JNIb'tIJT HEALTH <br /> 2330 North Loop 1604 West PERNIITISERIt'ICtS <br /> San Antonio, TX 78278 <br /> GROUNDWATER MONITORING REPORT FOURTH QUARTER 2009 AND WORK PLAN <br /> FOR D-ZONE WELL INSTALLATION, NUSTAR TERMINALS STOCKTON FACILITY, <br /> 2941 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff reviewed the 29 January 2010 Groundwater Monitoring Report, Fourth Quarter 2009 <br /> (Fourth QMR) and the 25 March 2010 Work Plan for D-Zone Monitoring Well Installation <br /> (Work Plan) 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 has designated some of its B-zone wells as C-zone wells. <br /> During the fourth quarter of 2009, depth to groundwater varied from about five to 11 feet below <br /> ground surface (bgs), and groundwater generally flowed to the southeast. ST/MW-1 contained <br /> the highest concentrations of total petroleum hydrocarbons as gasoline (TPHg) at 52,000 <br /> micrograms per liter (Ng/L), methyl tertiary butyl ether (MTBE) at 150,000 pg/L, and benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) concentrations at 10,000 pg/L, 6,300 pg/L, <br /> 1,200 pg/L, and 7,200 pg/L, respectively. PS/MW-14 contained the maximum concentrations <br /> of TPH as diesel (TPHd). These results are consistent with historical results. <br /> As discussed during our 20 January 2010 meeting, the Work Plan proposes to install two <br /> groundwater monitoring wells (ACA-3D and ACA-5D) to 72 and 87 feet bgs, respectively. <br /> These monitoring wells will be collocated and screened at intervals that coincide with borings <br /> ACA-3 and ACA-5, respectively. TPHd concentrations detected in grab groundwater samples <br /> ACA-3 and ACA-5, collected in October 2009, were 560 pg/L and 670 pg/L, respectively. <br /> Nustar anticipates that the new groundwater monitoring wells will be sampled 60 days <br /> following approval of this Work Plan and that a report can be submitted 60 days following <br /> receipt of the analytical data. <br /> California Environmental Protection Agency <br /> Va Recycled Paper <br />