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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles - Roek Stockton, California • Page 10 of 10 (in parts per billion) _ k � lklethanoT° EfIiann�, = _ " TI E�`� �DIPE_1 -IETBE' _ ge, � AIE MW14 Feb-02 -- - <1,000� 70,000 <100 <100 <100� <100 <100 Cont'd May-02 -- <I0,000 81,0001<1,000 <1,000 <1,000 <1,000 <1,000 Aug-02 - -- <10,000 140,000 <1,000 <1,000 <1,000 <1,000 <1,000 Nov-02 -- -- <10,)00 210,000 <1,000 <1,000 <1,000 <1,000 <1,000 Feb-03 -- -- <2000 110,000 <200 <200 <200 <200 <200 May-03 <10,000 100,000 <1,000 <1,000 <1,000 <1,000 <1,000 Au -03 <2,000 63,000 <200 <200 <200 <200 <200 MW I SA .Fan-03 -- <20 34 <2 0 <2 0 <2 0 <2 0 <2 0 Feb-03 - <20 59 <2 0 <2 0 <2 0 4.5 <2 0 May-03 <20 33 <2 0 0<2 <2 0 4.7 <2 0 Au -03 -- <20 86 <2 0 <2 0 1 <2 0 2.6 <2 0 MW15B Jan-03 ^= <20 76 <2 0 <2 0 <2 0 5.5 <2 0 Feb-03 <20 86 <2 0 <2 0 <2 0 May-03J.._ -- <20 190 <2 0 <2 0 <2 0 90 <2 0 Aug-03 I -- -- <20 ' 320 <2 0 <2 0 <20 6.8 <2 0 MW15C Sart-03 1 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Feb-03 I -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 May-03 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-03 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 MW16A Jan-03 -- <1000 2,500 <100 <100 <100 <100 <100 Feb-03 <400 2,900 <40 <40 <40 <40 <40 May-03 -- -- <400 1,300 <40 <40 <40 <40 <40 ' Aug-03 =_ == <400--F 1,400 <40 <40 <40 <40 <40 MW16B Jan-03 <200 170 <20 <20 <20 <20 <20 Feb-03 -- -- <400 260 <40 <40 <40 <40 <40 May-03 =_ == <400 87 <40 <40 <40 <40 <40 Aug-03 <400 120 <40 I <40 <40 <40 <40 NOTES Analyzed using modified EPA method 8260 Bold values mchcate value at or above method detection lunrt DIPE Di-isopropyl ether ETBE Ethyl tert-butyl ether MTBE = Methyl tert-butyl ether TAME tent-amyl methyl ether TBA - tert-butanol(tertiary butyl alcohol) 1,2 DCA = 1,2 Mchloroethane ' EDB = Ethylenedibromrde < Less than the nndicated detect,on limit I - Resampled 12/16/97 ** Amended result (Argon Laboratory corresp, 12/7100)