February 14, Burt Fleischer, R.E.A., R.E.P. Director, Environmental Affairs Hilmar Cheese Company 9001 N. Lander Avenue Hilmar, CA 95324

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3 February 14, 2012 Burt Fleischer, R.E.A., R.E.P. Directr, Envirnmental Affairs Hilmar Cheese Cmpany 9001 N. Lander Avenue Hilmar, CA Subject: Lwer Aquifer Data Gap Prgress Reprt #1 Hilmar Cheese Cmpany, Hilmar, Califrnia Dear Mr. Fleischer: Jacbsn James & Assciates, Inc. (JJ&A) prvides this prgress reprt fr implementatin f the September 22, 2011 Lwer Aquifer Evaluatin Update and Data Gap Wrk Plan (the Wrk Plan) as apprved by the Central Valley Reginal Water Quality Cntrl Bard (RWQCB) letter dated December 16, As specified in the RWQCB apprval letter, prgress reprts are t be submitted mnthly with the first submittal by February 15, The prgress reprt is rganized as fllws: Cmpleted Wrk In Prgress and Planned Wrk Schedule Review COMPLETED WORK Lwer Aquifer date gap activities cmpleted during this reprting perid are as fllws. Cntracting and permitting fr IN 1 vicinity vertical characterizatin wrk, including labratry cntracting and sampling crdinatin fr age dating sample cllectin and analyses. Lwer Aquifer grundwater sample cllectin January 24 25, 2012, frm mnitring wells MW 23, 26, 38 and 40 fr sulfur hexafluride and tritium/helium analyses fr age dating. Dwn gradient IN 1 vicinity vertical characterizatin data cllectin; dwn gradient bring SB 10 (identified as SB IN 1 1 in Wrk Plan, Figure 4 1). The estimated lcatin f SB 10 is shwn n the attached Figure 1; a figure will be prvided in the future with the actual lcatin upn receipt f the survey data. E lg cmpleted January 24, Depth discreet grab grundwater sampling cmpleted January 25 27, 2012, frm the fllwing intervals (shwn in feet belw grund surface (ft bgs): ft bgs ft bgs ft bgs ft bgs ft bgs HCC_LwerAq Prg Reprt 1_2012Feb14

4 HCC Lwer Aquifer Data Gap Wrk Prgress Reprt #1 February 14, 2012 Page 2 f 3 Samples frm all intervals were submitted fr labratry analysis f anin/catin chemistry and samples frm the ft bgs interval were als submitted fr sulfur hexafluride and tritium/helium analyses fr age dating. SB 10 was destryed n January 27, 2012 in accrdance with state and cunty prcedures. Up gradient IN 1 vicinity vertical characterizatin data cllectin; up gradient bring SB 11 (identified as SB IN 1 2 in Wrk Plan, Figure 4 1) was determined t nt be necessary based n SB 10 field data and the decisin was made with CVRWQCB cncurrence t alternatively cllect Lwer Aquifer samples frm the bring SB 12 (SB 12 was drilled in supprt f the IN 1 destructin wrk). The estimated lcatin f SB 12 is shwn n the attached Figure 1; a figure will be prvided in the future with the actual lcatin upn receipt f the survey data. Depth discreet grundwater sampling was cmpleted at SB 12 n February 1, 2012, frm the fllwing tw intervals: ft bgs ft bgs Samples frm bth intervals were submitted fr labratry analysis f anin/catin chemistry and samples frm the ft bgs interval were als submitted fr sulfur hexafluride and tritium/helium analyses fr age dating. Additinal activities perfrmed in relatin t the Lwer Aquifer data gap wrk included the quarterly grundwater level mnitring and sampling which was perfrmed n Lwer Aquifer mnitring wells January 4 5, IN PROGRESS AND PLANNED WORK The fllwing wrk is in prgress r planned fr the next prgress perid. Labratry anin/catin analyses fr SB 10 discreet grab samples. Labratry sulfur hexafluride analyses fr mnitring well samples and SB 10 grab sample. Receipt and preliminary evaluatin f anin/catin chemistry analyses results fr IN 1 vertical characterizatin data gap. Receipt and preliminary evaluatin f sulfur hexafluride analyses results fr Lwer Aquifer age dating data gap. Cnsideratin f labratry tritium/helium analyses fr mnitring well samples and SB 10 grab sample; if cnfirmed, analyses will be initiated. Preparatin f First Quarter 2012 grundwater mnitring and sampling reprt. SCHEDULE REVIEW The current schedule frecast indicates that all activities are n track fr submittal f a reprt by June 7, 2012, summarizing the results f the assessment near IN 1 and the age dating f the Lwer Aquifer grundwater in the selected wells. This reprt date was identified in the CVRWQCB s December 16, 2012 letter.

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