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California rional Water Quality Conti Board ; <br /> \� Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair. <br /> Arnold <br /> Linda S.Adams <br /> SS.Ada Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Governor <br /> Protection <br /> Phone(916)464A )464-4 <br /> t�I^S�� , nnalvalley <br /> u ul�i\1 ., <br /> 6 March 2008 MpR 1 0 2048 <br /> FN\I,RO60�E HEALTH <br /> Mr. Jeff Goold pEgM11!SFR ll' S <br /> Shell Oil Products US <br /> 20945 South Wilmington Avenue <br /> Carson, CA 90810 <br /> WELL DESTRUCTION WORK PLAN, SHELL STOCKTON TERMINAL, 3515 NAVY DRIVE, <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) staff <br /> reviewed the 19 February 2008 Well Destruction Work Plan (Work Plan) submitted by <br /> Conestoga-Rovers and Associates (CRA) on behalf of Shell Oil Products US (Shell) for the <br /> Shell Stockton Terminal at 3515 Navy Drive in Stockton (Site). <br /> The Work Plan describes Shell's plans to abandon monitoring well MW-27, as requested by <br /> the Port Of Stockton (Port). MW-27 is located south of the Site on property belonging to the <br /> Port. The abandonment is being performed in anticipation of construction activities. <br /> Representatives of the Port met with Regional Water Board staff on <br /> 14 December 2007 and conveyed their desire to have Shell proceed with the abandonment. <br /> Shell proposes to obtain a permit from the San Joaquin County Environmental Health <br /> Department (SJCEHD) to abandon the well by pressure grouting the casing to 2.5 feet below <br /> grade. The remaining casing will be removed and topped off with a 6-inch layer of grout, which <br /> will be backfilled with soil to the ground surface. The work was tentatively scheduled for the <br /> week of 3 March 2008. Shell will prepare a report as well as a Department of Water <br /> Resources (DWR) Well Completion/Destruction form documenting the abandonment. <br /> Groundwater monitoring in MW-27 was initiated in November 1997. Total petroleum <br /> hydrocarbons as diesel (TPHd) is the most frequently detected pollutant in <br /> MW-27. It was detected in excess of the taste and odor water quality objective (WQO) of <br /> 100 micrograms per liter (pg/L) between 1999 and 2004, with a maximum concentration of <br /> 2,260 pg/L in November 2000. Concentrations decreased to non-detect (<50 pg/L) between <br /> 2004 and 2006. TPHd was last detected in May and August of 2007 at 95 and 190 pg/L, <br /> respectively. Total petroleum hydrocarbons as gasoline (TPHg) was sporadically detected <br /> between 1999 and 2000. <br /> Despite the occasional recurring TPHd detections, Regional Water Board staff concur with <br /> Shell and the Port that the abandonment is appropriate. The TPHd detections in MW-27 have <br /> exceeded the WQO only three times since 2004. Additionally, removal of MW-27 will not <br /> present a data gap because there are two monitoring wells, MW-28 and MW-34 in which <br /> downgradient compliance monitoring can be conducted. <br /> California Environmental Protection Agency <br /> Qi Recycled Paper <br /> 1 <br />