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Ms. Vicki Goodenow - 2 - 8 August 2009 <br /> NuStar Terminals Stockton Faci <br /> toluene at 14,000 pg/L, and MTBE at 230,000 pg/L. PS/MW-14 and PS/P-12 contained the <br /> maximum concentrations of TPHd, ethyl benzene and total xylenes. Due to a history of non- <br /> detects, and in accordance with MRP No. R5-2007-0818, sampling for tertiary amyl methyl <br /> ether, di-isopropyl ether, ethyl tertiary butyl ether, ethanol, and methanol will be discontinued <br /> in PS/P-13, PS/MW-14, ACA-1A, ACA-2A, ACA-113, 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 that will include no filtration, filtration by <br /> glass beads, and silica gel cleanup. The results of the deep grab groundwater sampling will be <br /> used to develop a strategy for proceeding with well installation in the 90-foot bgs water bearing <br /> zone. <br /> Central Valley Water Board staff concurred with the Work Plan in our 8 July 2009 letter and <br /> requested submission of a report of the investigation with recommended locations for the <br /> 90-foot bgs wells by 30 October 2009. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 or <br /> betaylor(aD_waterboards.ca.gov. <br /> BRIAN TAYLOR, P.G. <br /> Engineering Geologist <br /> cc. Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Ms. Rita Koehnen, Port of Stockton, Stockton <br /> Mr. Joe Aldridge, NuStar Energy L.P, San Antonio Texas <br /> Mr. Sergio Morescalchi, Atlantic Richfield Company, San Ramon, CA <br /> Ms. Amanda Spencer, Ash Creek Associates, Inc., Portland, OR <br /> Mr. Jeremy Hughes, LFR, Granite Bay <br /> Mr. Rusty Benkosky, Stantec Consulting Corporation, Rancho Cordova <br />