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Historical TPH-G Concentrations in Groundwater The Earthgrains Company Stockton,California Monitoring Well lD/Concentration(ug/1) Date MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 7110!87 78,000 ND(50) ND(50) 4126188 1 1200 ND(50) 3119190 17,300 ND(50) ND(50) ND(50) ND(50) ND(50) 3,300 121201901 9,500 ND(50) ND(50) ND(50) ND(50) 4/9/921 65,9001 200 ND(50) ND(50) ND(50) 8119192 96 000 ND(50) 12123192 88,000 ND(50) 417!93 196,000 ND(50) ND(50) 7130193 53,000 ND(50) ND(50) ND(50) 10/21/93 41,004 ND(50) ND(50) 12!29193 67,000 ND(50) ND(50) 3123!94 69,000 1,600 ND(50) 14 000 ND(50) ND(50) ND(50) 3 800 ND(50) ND(50 6 500 6!7!94 34,000 530 ND(50) 7 900 ND(50) ND(50) ND(50) 1 400 ND(50) ND(50) 7,100 918194 28 000 1 200 ND(50) 6,600 ND(50) ND(50) ND(50) 2,400 ND(50) ND(50) 6,800 2112!96 26 000 ND(50) ND(50) 3,700 ND(50) ND(50) ND(50) ND(50) 310 2,600 5114!96 27 000 ND(50) ND(50) 3,800 ND(50) 53 210 ND(50) 600 5,000 9118196 24 000 ND(50) ND(50) ND(50) ND(50) ND(50) 65 ND(50) 300 2,100 12/18/96 23,000 ND(50) ND(50) 6500 ND(50) ND(50) ND(50) ND(50) ND 50} ND(50) ND(50) 900 69 7/151971 22 000 ND(50) ND(50) ND(50) ND(50) ND(50) 200 ND(50 ND(50) 240 ND(50) 2000 ND(50) 10!23197 24,000 ND(50) ND(50) ND(50) ND(50) NS 88 ND(50) NS 130 ND(50) 4100 ND(50) i 260 000 _ __ 16000 :, ,_ `s �� t M W t 200 004 ' �—MW 2 a� d g 12000� 3 � —BMW-3 160000 n m 10000U0 MW-4 6000 V --*—MW-5 L) 100000- r — — 6000 LU > �� W —i—MW 7 7'V1 , � s k 4000 w —HMW 6 50000. pIrv,k,Iax,a , 2000 O f MW 9 s —BMW 10 ,�ryy � —K—MW-11 b\ 4, 0 .0 'z DATE ND Not detected at or above laboratory detection limit shown in parentheses TPH-G Total petroleum hydrocarbons as gasoline ugll Micrograms per liter NS Not Sampled E\121382112599713gtr971Histtvhg As XL5-1211/97 Page 1 of 1