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i <br /> 43 <br /> .p <br /> • Second Quarter 2003 Monitoring Report <br /> Quik Stop Market No 121 <br /> Page 4 <br /> concentration in MW-4 has dropped from 15,000 ug/L on August 16, 2002 to 3 9 ug/L on April <br /> 10, 2003 No MTBE was detected in any of the three B-aquifer wells for the first time since they <br /> were installed A summary of the data collected during the operation of the System is presented <br /> in Table 3 <br /> In summary, TPHg and MTBE remains in the shallow groundwater of the A-aquifer in the <br /> vicinity of the fuel tanks, although at considerably lower concentrations The KVA C-Sparge <br /> system is having a positive impact on the groundwater conditions at the site CCI will continue <br /> to monitor the System on a bi-monthly basis and to sample the site on a quarterly basis to gather <br /> additional groundwater quality data The next quarterly sample round is scheduled for July 2003 <br /> Limitations <br /> The discussion presented in this report is based on the following <br /> 1 The observations of the field personnel, <br /> . 2 The results of the laboratory analyses performed by a state certified laboratory, <br /> 3 Our understanding of the regulations of the State of California and San Joaquin <br /> County <br /> It is possible that variations in the soil or groundwater conditions could exist beyond the points <br /> explored in this investigation Also, changes in groundwater conditions could occur at some time <br /> in the future due to variations in rainfall, temperature, regional water usage, or other factors <br /> The services performed by CCI have been conducted in a manner consistent with the level of <br /> care and skill ordinarily exercised by members of our profession currently practicing under <br /> similar conditions in the Manteca area No other warranty, express or implied, is made Please <br /> note that contamination of soil and groundwater must be reported to the appropriate agencies in a <br /> timely manner <br /> CCI includes in this report chemical analytical data from a state-certified laboratory CCI has <br /> been informed that the analyses are performed according to procedures suggested by the U S <br /> EPA and the State of California CCI is not responsible for laboratory errors in procedure or <br /> results reporting <br /> i <br />