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California�egional Water Quality Con`--ol Board
<br /> Central Valley Region
<br /> \..
<br /> Karl E. Longley,ScD, P.F.,Chair
<br /> Linda S. Adams I I(120 Sun Ccnold
<br /> ti., _,forl / _ Center Drive H2O0. Rancho Cordova.CaliforniaCalifornia (}6
<br /> a 9567114 Schwarzene er
<br /> Phone(916)464-3291 •FAX(916)464-464 gg
<br /> nrnv,nm u,d Gorer-nor
<br /> hupwaterboards ca.govlcentralvalleN
<br /> 25 November 2009 ^LD E(r__-�EffEo
<br /> Ms. Vicki Goodenow DEC 1 5 2009
<br /> NuStar Energy L.P. ENVIRONMENT HEALTH
<br /> 2330 North Loop 1604 West PERMIT
<br /> San Antonio, TX 78278 /SERVICES
<br /> GROUNDWATER MONITORING REPORT THIRD QUARTER 2009 AND SUBSURFACE
<br /> INVESTIGATION REPORT, NUSTAR TERMINALS STOCKTON FACILITY, 2941 NAVY
<br /> DRIVE, STOCKTON, SAN JOAQUIN COUNTY
<br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board)
<br /> staff reviewed the 29 October 2009 Groundwater Monitoring Report, Third Quarter 2009 (Third
<br /> QMR) and the 29 October 2009 Subsurface Investigation Report (Report) submitted by Ash
<br /> Creek Associates, Inc. (Ash Creek) on behalf of NuStar Terminals Operating Partnership L.P.
<br /> (NuStar) for the NuStar Terminals Stockton Facility located at 2941 Navy Drive in Stockton
<br /> (Site). Groundwater monitoring at the Site is conducted pursuant to Monitoring and Reporting
<br /> 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 third quarter of 2009, ST-MW/1 contained the highest concentrations of total
<br /> petroleum hydrocarbons as gasoline (TPHg) at 110,000 micrograms per liter (Ng/L), methyl
<br /> tertiary butyl ether (MTBE) at 280,000 pg/L, and benzene, toluene, ethylbenzene, and total
<br /> xylenes (BTEX) concentrations at 20,000 pg/L, 11 ,000 pg/L, 3,000 pg/L, and 18,000 pg/L,
<br /> respectively. These concentrations may be indicative of free product (i.e., liquid phase
<br /> hydrocarbons). PS/MW-14 contained the maximum concentrations of TPH as diesel (TPHd).
<br /> These results are consistent with historical results. Due to a history of non-detects, and in
<br /> accordance with the MRP, sampling for tertiary amyl methyl ether, di-isopropyl ether, ethyl
<br /> tertiary butyl ether, ethanol, and methanol were discontinued in PS/P-13, PS/MW-14, ACA-2A,
<br /> ACA-1 B, ACA-213, and OW-8C.
<br /> The 17 June 2009 Subsurface Investigation Work Plan (Work Plan) proposed to install
<br /> groundwater monitoring wells, conduct lower zone (about 90 feet below ground surface [bgs])
<br /> grab groundwater sampling at two locations, and conduct a comparative laboratory analysis
<br /> for TPHd using three variations of Method 8015 B to include no filtration, filtration by glass
<br /> beads, and silica gel cleanup. Central Valley Water Board staff concurred with the Work Plan
<br /> California Environmental Protection Agent.),
<br /> led P VO
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