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CRYSTAL CREAMERY STOCKTON <br /> WKA No. 1628.10 <br /> August 20, 2003 <br /> Page 3 <br /> V <br /> Conclusions and Recommendations <br /> Groundwater samples from MWl continue to reveal no detectable concentrations of the target <br /> analytes; a trend that has been consistent since ozone injection commenced (see Chart 1). <br /> Groundwater in the vicinity of wells MW4 and MW5 still exhibits impact from gasoline and <br /> BTEX compounds,but analytical data continues to show a substantial decrease in analyte <br /> concentrations at MW5 (see Chart 3). While MW4 does not exhibit the dramatic decline seen in <br /> MW5, the peak concentrations in MW4 appear to be somewhat lower than the trend prior to <br /> ozone injection (see Chart 2). Overall,we believe that ozone injection continues to have a <br /> favorable effect on groundwater at the site. <br /> As approved by Mr. Jeffrey Wong of the San Joaquin County Public Health Services, the <br /> following changes to the existing groundwater monitoring program at the site will be <br /> implemented beginning with the third quarter 2003 monitoring event: <br /> MWl no change—sample quarterly for TPH gas, BTEX, and five oxygenates; <br /> MW2 sample annually(second quarter) for TPH gas, BTEX, and five oxygenates; <br /> V <br /> MW3 sample quarterly for MTBE only; <br /> MW4 no change- sample quarterly for TPH gas,BTEX, and five oxygenates; <br /> V <br /> MW5 no change- sample quarterly for TPH gas,BTEX, and five oxygenates; <br /> MW6 sample annually(second quarter) for TPH gas, BTEX, and five oxygenates; <br /> MW7 sample annually(second quarter) for TPH gas, BTEX, and five oxygenates; <br /> MW8 sample annually(second quarter) for TPH gas, BTEX, and five oxygenates; <br /> The depth to groundwater would continue to be measured at each of the wells during each <br /> quarterly monitoring event. <br /> Limitations <br /> V <br /> The statements and conclusions in this report are based upon the scope of work described above <br /> and on observations made on the date of our fieldwork as presented above. Our work was <br /> performed using a degree of skill consistent with that of competent environmental consulting <br /> firms performing similar work in the area. No recommendation is made as to the suitability of <br /> the property for any purpose. The result of our investigation does not preclude the possibility <br /> .r <br /> NNW <br /> rr WALLACE-KUHL <br /> 6 ASSOCIATES INC. <br />