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' 26 February 2 . ry 003 ' AGE-NC Project No. 96-0254 Page 4 of 4 ' maximum contaminant level (MCL) of 1 µg/1 in samples collected from wells MW-113 and MW-4. ' MTBE was detected in the ground water samples collected from MW-1B, MW-2B and MW-4; MTBE concentrations in sample MW-1B exceeded the State of California MCL of 13 µg/1 in drinking water. ' Concentrations of TPH-g, BTEX compounds and MTBE detected in wells MW-1B and MW-4 were at 'non-nal' levels during the fourth quarter sampling event- The elevated ' concentrations detected during the previous quarter appear to have been anomalous. ' 5.0. RECOMMENDATIONS ' Based on the results of this investigation, AGE recommends continued quarterly ground water monitoring at the site;the next monitoring event should be scheduled for January 2002.Additionally, AGE recommends completion of the scope of work proposed in the AGE-prepared Remedial Action Plan (RAP) dated 31 October 2002,pending approval by the EHD. Work to be completed includes abandoning monitoring wells MW-1, MW-4 and MW-7 for excavation of petroleum hydrocarbon- impacted soil from the former UST area. 6.0. LIMITATIONS ' Our professional services were performed using that degree of care and skill ordinarilyexercised b Y environmental consultants practicing in this or similar localities. The findings were based mainly upon analytical results provided by an independent laboratory. Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (i.e. monitoring well ground water samples), and subsurface conditions may ' vary away from these data points. No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report. I I I I i Advanced GeaEnvironmental Inc. I