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TWO <br /> Summary of Ground Water Monitoring and Analyses <br /> Former Mobil Oil Bulk Plant 04-343 1 <br /> 500 East Grantline Road <br /> Tracy, California ! <br /> Wen Data of Casing Depth to Ground TPH-G TPH-D Benzene Toluene Ethyl- Total Fecal Lead Phenol Diethyl 2-HEX Lab <br /> ID Sampling Elevation Water Water. (ppb) (ppb) (ppb) (Ppb) benzene Xylenes coloform (ppb) (ppb) Phthalate (ppb) <br /> (feet) (feet) Elevation (ppb) (ppb) (ppb) (ppb) <br /> AW-4 07'120/892 11.14 22.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.6 ND<0.5 - - --- -- - SEQ <br /> (can't) 1021/92 11.22 22.04 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - - SEQ <br /> 0122/93 10.17 23.09 ND<50 ND<50 ND<0.5 ND<0.5 ND<0,5 ND<0.5 -- - 3.6 ND<2-0 ND<5.0 SEQ <br /> 04/02/93 10.61 22.65 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - -- - SEQ <br /> 0527193 10.74 22.52 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SED <br /> 10/28/93 11.13 22.13 ND<50 ND<50 ND<0.5 ND<0.5 ND<0,5 ND<0.5 - - - - - SEQ <br /> AW-5 05/07/91 30.61 1021 20.40 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - - - - SAL <br /> 08121/91 10.07 20.54 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - _ _ - SEQ <br /> 1128/81 10.69 19.92 ND<30 370 ND<0.30 ND<0.30 ND<0.30 ND<0.30 SEQ <br /> 02/21/92 10,43 20.18 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - --- - - - SEQ <br /> 04/07/92 31.11 10.72 20.39 ND-c30 ND<50 ND<0.30 NDc0.30 ND<0.30 ND<0.30 - - - - - SEQ <br /> 04/24/92 10.71 20.40 ND40 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - -- - - SEQ <br /> 07/20/92 10,79 20.32 N0<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0,5 - - - - - SEQ <br /> '1021192 10.78 20.33 ND<60 98 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ <br /> 01122/93 10.09 21.02 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - ND<P0 NDQ.O ND<5.0 SEQ <br /> 04102/93 10.48 20.83 NDe-W ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ <br /> 0527/93 10.52 20.59 ND<50 ND<50 ND<0.5 ND<0.5 ND<0,5 ND<0.5 - - - - ... SEQ <br /> 1028/93 10.80 20.31 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ <br /> I <br /> AW-6 05!07191 29.59 10.37 1922 ND<50 ND<60 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - -- - - SAL <br /> 081'21/91 10.25 19.34 N0<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - ,. SEQ <br /> 1128/91 10.88 18.71 ND<30 170 ND<0.30 ND<0,3D ND<0.30 ND<0.30 - - - - - SEQ <br /> 02/21/92 10.64 18.95 ND<30 ND<50 ND<0.30 ND<0.3D ND<0.30 ND<0.30 - - - - - SEQ <br /> 04107/92 30.09 10.89 19.20 ND<30 ND<50 ND<0.30 ND<0.3D ND<0.30 ND<0.30 - - - -- - SEQ <br /> 04/24/92 10.88 1921 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ <br /> 07120/92 '10.85 1924 ND<50 ND<50 ND<o.5 ND<0.5 ND<0.5 ND<0.5 - - - - _ SEQ <br /> NOTES: ppb = parts per billion W Tap of casing elevations were surveyed in referenoe to a railroad spike set in an <br /> TPH-G = total petroleum hydrocarbons as gasoline Island on ftre approxk v&centwilne of East Granttine Road 19.5 feetwest komthe <br /> TPH-D - total petroleum hydrocarbons as diesel centedina of the railroad spur tracks. <br /> ND - not detected at detectlon Mfrs stated In official laboratory repotts All wens resurveyed on April 7,1992 by Land improvement Service&April 7,0424, <br /> - not measuredlno <br /> t enalyxed+nat applicable 1992 data reflect resurveyed efevatlorfs. <br /> S-HEX - 2-Hexen-1-0I(E) <br /> ' - sample reported as not matching typical gasoline pattem <br /> sampled reported as not appearing to oonttakr gasollne <br /> AEL - American Environmental Laboratories,Im <br /> SAL - Superior Analytical Laboratories,Inc, <br /> SEQ - Sequoia Analytical <br /> Page 3 of 5 30-13WN TABLE iVOM <br />