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Y�I CRYSTAL CREAMERY STOCKTON -t. WKA No. 1628.10 January 8, 2003 .r Page 3 elevations)for wells MW1, MW4, and MW5 are presented in Charts 1, 2, and 3,respectively. Laboratory analytical reports and Chain-of-Custody documentation are included in Appendix B. Conclusions Groundwater in the vicinity of wells MW4 and MW5 continues to show impact from gasoline and BTEX compounds,but analytical data from the third and fourth quarters of 2002 suggests that ozone injection is having a favorable effect on groundwater at the site. Concentrations of TPH as gasoline(and associated compounds)have historically shown seasonal peaks and declines (see Charts 2 and 3), with the highest concentrations commonly occurring during the third or fourth quarter. The third and fourth quarter(2002) analytical data for MW4 suggests that TPH gasoline concentrations may have peaked at 13,000 µg/L. If that proves to be the case •- (based on future monitoring results), it would be the lowest seasonal peak in MW4 in the past eight years. TPH gasoline levels in MW5 have decreased during the past two quarters, with fourth quarter(2002)results showing the lowest concentration since 1996. Groundwater concentrations of TPH as gasoline in well MW 1 have attenuated to non-detectable levels during -✓ the third and fourth quarters of 2002 (see Chart 1). Down gradient wells MW7 and MW8 NEW continue to be clear of detectable gasoline, BTEX, and fuel oxygenate concentrations. .r Limitations The statements and conclusions in this report are based upon the scope of work described above and on observations made on the date of our fieldwork as presented above. Our work was performed using a degree of skill consistent with that of competent environmental consulting firms performing similar work in the area. No recommendation is made as to the suitability of the property for any purpose. The result of our investigation does not preclude the possibility that materials currently, or in the future, defined as hazardous are present on the property. This report is applicable only to the investigated property and should not be used for any other property. No warranty is expressed or implied. r V WALLACE-KUHL £r ASSOCIATES INC.