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California ►—­�gional Water Quality Contril Board - <br /> Central Valley Region <br /> ion <br /> Karl E. Longle}',ScD, P.E.,Chair <br /> Linda S.Adams 11020 Sun Ccnicr DriNc 02O0.Rancho Cordova,Cahlornia 95670-61 14 Arnold <br /> Cererun or Phone(916)464-3291 •FAX(916)464-4645 Schwarzeneg <br /> {_g1'Ir"Ilmewal GM C/)701 <br /> hltp:!hcxN\N \caterbuards-ca.eo�icenlv <br /> traallcN <br /> Prwerriun <br /> 27 March 2009 ID �1 <br /> MAR a i Zi;t 9 <br /> Mr. Tim Van Domelen EWIRONNIENT 'HEALTH <br /> Manager, Environmental Health, Safety, and Security PERMIT(gERVICES <br /> J.R. Simplot Company <br /> 16777 Howland Road <br /> Lathrop, CA <br /> UNDERGROUND STORAGE TANK INVESTIGATION AND CLOSURE, <br /> J.R. SIMPLOT COMPANY, 16777 HOWLAND ROAD, LATHROP, SAN JOAQUIN <br /> COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional <br /> Water Board) staff have reviewed records on file with J.R. Simplot, Glenn Springs <br /> Holdings, Inc. (GHSI), and San Joaquin County to determine the status of an open <br /> underground storage tank (UST) investigation that began in 1988. The former UST <br /> area is within the central part of the J.R. Simplot facility, and under the hydraulic <br /> influence of extraction wells that are part of the groundwater remediation project <br /> managed by GHSI. The case was referred to the Regional Water Board in 1995, but <br /> no action was taken with regard to petroleum-impacted soils and potential groundwater <br /> impacts resulting from the UST release. <br /> Our review of file materials indicates that three monitoring wells were installed in the <br /> vicinity of the UST excavation area in 1989, approximately at the vertices of the triangle <br /> shown in the attached figure. Because there is no record that these monitoring wells <br /> were properly abandoned, we believe that they may have been covered and are still in <br /> place. Impacts to soils as a result of the release have not been addressed. <br /> In order to move this case toward reaulatory closure, the following actions are needed: <br /> 1 . We request that you locate the former tank excavation area and collect <br /> confirmation soil samples for analysis of total petroleum hydrocarbons as gasoline <br /> and diesel (TPH-g and TPH-d), benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX). <br /> 2. In the absence of any information documenting the abandonment of the <br /> monitoring wells, we request that you locate the three monitoring wells, sample <br /> and analyze groundwater for TPH-d, TPH-g, and BTEX (well conditions <br /> permitting), and properly abandon the wells if concentrations of these constituents <br /> in groundwater are below the detection limits of EPA Method 8260. <br /> California Environmental Protection Agency <br />