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Table 2. Groundwater Chemical Data Well Date TPHG Benzene Toluene Ethylbenzene Xylene MTBE NoSampled -----------------------------ug/1 ------------------------------- MW-1 3/28/96 ND ND ND ND ND NA MW-1 6/27/96 280 0 7 0 6 2 4 9 1 NA MW-1 9/23/96 ND ND ND ND ND NA MW-1 12/19/96 ND ND ND ND ND ND MW-1 3/10/97 ND ND ND ND ND ND MW-2 3/28/96 12,000 80 5 0 7 7 20 NA MW-2 6/27/96 4,900 7 2 4 8 21 25 NA MW-2 9/23/96 4,500 59 28 15 14 NA MW-2 12/19/96 4,400 9 9 86 25 26 ND MW-2 3/10/97 4,000 5 5 21 13 12 ND MW-3 3/28/96 2,500 21 12 12 24 NA MW-3 6/27/96 3,100 13 7 0 8 7 19 NA MW-3 9/23/96 2,600 19 88 11 19 NA MW-3 12/19/96 2,900 12 84 81 16 ND MW-3 3/10/97 1,500 10 3 9 5 0 91 ND Blank 3/10/97 ND ND ND ND ND ND ND-None detected NA - Not Analyzed ug/1 - micrograms per liter Discussion A relatively moderate to slow groundwater movement is inferred from the groundwater measurement data Overall site shallow groundwater movement is north-northeasterly and the flow direction is consistent with historically observed trends Concentrations of TPHG were observed in the Wells MW-2 and MW-3 declined slightly and contaminants were not observed in MW-1 In our opinion, these represent degraded fuel and are interpreted to be residual drainage Fluctuating levels of degraded fuel contaminants, showing an overall declining trend are anticipated in the future Monitoring Schedule The continuation of the quarterly groundwater monitoring program is recommended for this site Limitations This report has been prepared for the specifically for the Mr Ed's Muffler Site at 595 E 11 th Street in Tracy, and was done according to the current State and local agency suggested guidance documents for these investigations The interpretations, conclusions and recommendations made herein are based on the data and analysis for the soil and water samples collected on-site and Mr Ed's Project No 4090-P Page 3