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.......... ..... <br /> I®R-- <br /> Ms.Diane Hinson <br /> January 11,1991 <br /> Page 2 <br /> C,,.Vnd water AngW—Icul�R`1'1'13 toluene,clhylben7jere'xylenes,and <br /> sample was submitted for analysis of benzene, ental Plotectiriin Agency and <br /> Each ground watertsorground <br /> total pelrojeurn hydrocarbons (TpH) as gasoline using U.S.U-S- Env'ronm laboratory rrsu <br /> California Department of Health Senices approved w.��thods.The a nalYtical If Sults are,"llso <br /> ted on October 249 1990, are summary. <br /> in Table 2. P,'cvivus Fes <br /> r -orate <br /> water samples collected 'oples of the Certified Jab )rY reports for October lg(X)are <br /> provided in'fable 2 for comparison. <br /> Included In Enclosure B. onccntration of Petroleum consthucrits from July <br /> ry results Indicate a decl hle in the c �of bimz=and TPH doubled in <br /> Analytical laboratory The copcentratlo'! <br /> to October 1990,except in monitoring well MW-I Ions ate signillrantly less than <br /> monitoring well rIW-1 during this time,period. Hov;cvcf,the <br /> concen"t <br /> .In r benne <br /> and TPH in other monitoring wells- <br /> the concentration 0 1 and submit a written r,cport 10 <br /> collect grolipci watcr.5ainples the last week of January A99week beginning March 18, 1991. <br /> Delta will mental Health, the <br /> the Son Joaquin County,Department of Envirork event or this letler re4l;1311, please call me [It <br /> If you hove questions regarding the January sampling <br /> (916)638-7083. <br /> Sincerely, <br /> I)FUA ENVIRONMENTAL CONSUIXANTS,INC, <br /> 111'�iles <br /> Hugh J. <br /> project Engincet <br /> 14cnry A.Dihm,P,P– <br /> project Manager <br /> HAD:14JM-.ecd <br /> Enclosures <br /> Barbara Mickelsun,Delta Environmental Consultants,Inc. <br /> Welic. his. <br /> Mr.Jack Brnstad,Shell 011 company 1 Water ou'.111ty Control Board <br /> Mr.Jim mausban,central valley Rcgionft <br />