ARCHIVED REPORTS XR0010096 - Laserfiche WebLink

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Table 2 Groundwater Chemical Data, cont. Well Date TPHG Benzene Toluene Ethylbenzene Xylene Fuel Ox No Sampled ug/1 MW-5 8/20197 ND NO ND NO NO NO MW-5 12/12/97 ND NO NO NO NO NO MW-6 8/20/97 6,000 09 4 6 55 11 NO MW-6 12/12/97 170 0 7 29 1 0 66 NO MW-7 8/20/97 NO NO NO NO NO NO MW-7 12/12/97 NO NO NO ND ND NO MW-8 8120/97 NO NO NO NO NO NO MW-8 12/12/97 NO NO NO ND NO NO MW-9 8/20/97 14,000 12 4 0 14 24 NO MW-9 12/17/97 260 11 15 3 7 12 NO Blank 12/12/97 NO NO NO ND NO NO NO- None detected NA-Not Analyzed ug/I -micrograms per liter Fuel Ox -Fuel Oxygenates by Method 8260 from Dec , 1997 forward 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, MW-3, MW-6 and MW-9 and contaminants were not observed in MW 1 TPHG concentrations declined and Benzene concentrations increased slightly These fluctuations are attributed to winter precipitation recharge and rising water levels In our opinion, these represent highly degraded fuel and fluctuating concentrations of contaminants and are anticipated to continue to show an overall declining trend Monitoring Schedule The continuation of the quarterly groundwater monitoring program Is recommended for this site Wright will continue the addition of these compounds in the next sampling round Limitations This report has been prepared specifically for the Mr Ed's Muffler Site at 595 E 11th 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 46 data and analysis for the soil and water samples collected on-site and