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Quik Stop Market No 121 CCI Project No 12118-2 Page 5 The MTBE concentration in MW-4 has dropped from 15,000 ug/L on August 16, 2002 to 68 ug/L on October 8, 2002, However, the MTBE concentrations have increased slightly in MW-5, from 15 ug/L on August 16, 2002 to 49 ug/L on October 8, 2002 A summary of the data collected during the operation of the System is presented in Table 3 In summary, TPHg and MTBE remains in the upper shallow groundwater of the A-aquifer in the vicinity of the fuel tanks, although at reduced concentrations MTBE was also detected in low concentrations in B-aquifer well MW-6 and at very low concentrations in monitoring well MW- 9 It appears the KVA C-Sparge system is having a positive impact on the groundwater conditions at the site CCI will continue to monitor the System on a bi-monthly basis and sample the site on a quarterly basis to gather additional groundwater quality data The next quarterly sample round is scheduled for January 2003 Limitations The discussion presented in this report is based on the following . 1 The observations of the field personnel, 2 The results of the laboratory analyses performed by a state certified laboratory, 3 Our understanding of the regulations of the State of California and San Joaquin County It is possible that variations in the soil or groundwater conditions could exist beyond the points explored in this investigation Also, changes in groundwater conditions could occur at some time in the future due to variations in rainfall, temperature, regional water usage, or other factors The services performed by CCI have been conducted in a manner consistent with the level of care and skill ordinarily exercised by members of our profession currently practicing under similar conditions in the Manteca area No other warranty, express or implied, is made Please note that contamination of soil and groundwater must be reported to the appropriate agencies in a timely manner CCI includes in this report chemical analytical data from a state-certified laboratory CCI has been informed that the analyses are performed according to procedures suggested by the U S EPA and the State of California CCI is not responsible for laboratory errors in procedure or results reporting