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-s <br /> Union Ice Company - Weber Street <br /> Phase II- Report of Findings <br /> Page 3 <br /> that time. <br /> 8. Recent sampling of the upper aquifer wells at this site show "ND's" for <br /> TPH and BTE&X. Removal of most of the contaminated soil may be <br /> directly related to this phenomenon. <br /> 9. Well 4D, the lower aquifer well, sampled positive for minor levels (all <br /> below MCL's) of Toluene, Ethyl Benzene and Xylene in March, 1991. This <br /> well sampled "ND" for all constituents in April, 1991. Apparently there has <br /> been minor contamination of`he lower aquifer, at this site. <br /> RECOMMENDATIONS <br /> 1. The remaining soils contamination near the southeast corner of the remedial <br /> excavation should be characterized by four(4)exploratory borings (see Plate <br /> 7). <br /> 2. Once characterized, a soils remediation plan will be submitted, if conditions <br /> warrant doinn such. <br /> 3. Since contaminant levels in the ground water, at this site, appears to have <br /> markedly improved since August of 1990, we recommend no further ground <br /> water remediation efforts be undertaken for the time being. Instead, the <br /> ground water contaminate levels and the elevation of the ground water <br /> should be monitored on a quarterly basis for a one(1) year period. <br /> 4. If all ground water samples analyze either "ND" or below MCL's for <br /> BTE&X during the one (1) year period, then this site should be evaluated <br /> for closure by San Joaquin County Regulatory officials. <br /> The above represents our best professional opinion with respect to ground water flow <br /> and contamination conditions, at this site. These opinions were derived using the <br /> existing data at hand, and with reasonable standards of care common to the <br /> hydrogeologic consulting community in Northern California 1990-1991. <br /> It should be understood that the above opinions were derived from observations of ggeo- <br /> _ _..... _ _.....logic._conditions.-in...-soils_and water samples taken from bonngs and monitor wells. <br /> These conditions were protected into unobserved ares of the site: The opmtons, <br /> therefore, involve thoughtful interpretation of the data. <br />