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rr rt��r ■r nor r� ■rr r r� low = M rr M r M � r TABLE 1 HISTORICAL GROUND WA ER ANALYTICAL TESTING RESULTS 5400 and 5606 Pacific Avenue,Stockton,California concentration in pg/L Sample IA _pTW _TPSt G BENZENE sec B$ n-BUT\L 3,2 DCA EB IPB MTBE NAMIT n P$ TOLUENE 1,2,4 TMB 1,3,5 TMB XYLENES Methanol Ethanol NOTES Only compounds which were detected are shown on this table (l)Samples taken on 12 19-95 were analyzed outside of their holding time 12-06-94 1,2-Dichloropropane was detected in well MW-1(5 3 pg/L) 02-09-95 1,2-Dtchloropropane was detected tow ell MW-1(1 3 pg/L) 06-21 95 12 Dtchloropropane was detected in wells MW I(1 6 pg/L)and MW4(1 3 pg/L), Methylene chloride was detected in wells MW 3(4 8 pg/L)and MWA(2 4 pg/L) 03-11 96 Chloroform was detected in wells MW 1(3 7 pg/L) MW 5(3 0 pg/L),and MW 6(l 3 pg/L) 06 1996 12 Dtchloropropane was detected in well MW 1(1 2 pg/L) 12 05 96 Chloroform was detected to well MW-1(2 6 pg/L) 12-10-97 Chloroform was detected in wells MW I(1 6 pg/L)and MW 5(1 2 pg/L) 09 16-98 l 2-Dtchloropropane was detet,ted in%% ils MW l(1 2 pg/L)and VEW-5(3 4 pg/L) 09 16-98 p-isopropyltoluene was detected in wells MW-1(l 5 pg/L) VEW-4(8 4 pg/L) and VFW 5(6 2 jig/L) 09-16-99 p-Isopropyl(oluene was detected in Weil MW 2(1 1 pg/L) 09 IMI) Tetrachlornethene was detected in well MW 18(1 4 pg/L) p isopropyltoluene was detected in well MW 19D(1 1 pg/L), Several wells contained methylene chloride a laboratory contaminant 12/13100 Methylene chloride a laboratory contaminant was detected in well MW-13(25 0 pg/L) Several wells contained chloroform in low concentrations The chloroform is believed to be den%ed from the tap water used to decontaminate the pump and hose system 09/25/01 Telrachloroethene was detected in Welk MW-27(4 1 pg/L)and MW 18(1 6 pg/L) p Isopropyltoluene was detected in w ell MW-8D @ 45'(25 pg/kg) 09/22/02 Tertiary Butyl Alcohol was detected to wells MW-3(70 pg/L) MW4(19 pg/L) MW-14A(5 6 pg/L) MW 25S(37 pg/L) and MW-25D(38 pg/L) Chlorofonn was detected in well MW-1(3 0 pg/L)and TetrachlOroethene was detected in wells MW-18 (0 85 pg/L) MW-21S(0 58 pg/L) and MW-27(2 3 pg/L) 12/03/02 p-Isopropyltoluene(19pg/L)and Styrent(1 5 pg/L)were detected in well 114W I I Vinyl chloride was detected to well MW-17(2 6 pg/L) Ietrachloroethene was detected to wells MW 18(0 92 pg/L) MW 23D(0 82 pg 1L) AS 26(0 65 pg/L)and MW 27(4 1 pg/L) Trichloroethene was detected to Hell MW-27(1 8 pg'L) 02/18/03 Teirachlorocthene was detected in wells MW 18(0 75 pg/L), MW 21S(0 95pg/L),and MW 27(3 7 pg/L), p-Isopropyltoluene was detected mwel[s MW 16(l 1 991L)and MW-25D(2 9 pg/L), and Trichloraelhene(1 4 pg/L)was detected in well MW-27 <=Not detected at or above t.oncentration limit listed 12 4-TM13=12,4 Tttmelhyibenzene 12-DCA=1 2 Dichloroethane 13 5 TMB=13 5-Trimethylbenzene DTW=Depth to Water EB-Ethylbenzene IPB=lsopropylbenzene MTBE=Methyl Tertiary Butyl Ether N-BUTYL=n Butylbeivene N PB=n Propylbenzene NA=Not Analyzed/Not Accessible NM =Not Measured NAPHT=Naphthalene ND=Not Detected NS=Not Sampled sec-BB=sec Sutylbenzene TPH G=Total Petroleum t3ydrocdrbons as Gasoline N 1232 ANALYTICAL-DATA 1232 ANALYTICAL DATA Page 27 of 27 ENPIRONAIENTAL AUDIT,INC