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' 14 January 2004 iAGE-NC Project No. 97-0327 Page 4 of 5 ' • Low concentrations of dissolved TPH-g and BTEX have previously been and currently detected from well MW-2 indicating that only a minor TPH-g and BTEX-impact to ground water in the area assessed. ' • Low concentration of dissolved TPH-d have previously been detected from wells MW-I through MW-4 indicating that only a minor TPH-d-impact to ground water in the area ' assessed. _ • A low concentration of dissolved MTBE was detected in the sample collected from well MW-2 indicating only a minor impact to ground water in the area assessed. ' • Low concentrations of 1,2-DCA continue to be detected in the samples collected from wells MW-1, MW-2 and MW-4 indicating a minor impact to ground water in the area assessed. 1 5.0. RECOMMENDATIONS 1 Based upon data collected during the third quarter 2003 AGE recommends: p s Reduction of quarterly monitoring/sampling events to semi-annual monitoring/sampling events at the site. Thus far, twelve ground water mon itoringlsampling events have been performed at wells MW-1 through MW-4 from February 2000 to September 2003. AGE ' believes that quarterly ground water monitoring events at this stage of the investigation is not cost effective and will not provide enough useful information to supplement the ongoing investigation. Semi-annual monitoring/sampling events should be adequate to monitor ' ground water at the site and should be 're-evaluated on an annual basis. The next monitoring/sampling event should be scheduled for January 2004. f ' At attempt will be made to contact the property owners for the domestic water wells located at 503 North Oro Avenue, 451 North Lillian Avenue and, 452 North Lillian Avenue to analyze for 1,2-DCA. — 46-*, �4st Chi t'-j 5o-4d3 df-e In order to progress with the investigation, AGE recommends that a site conceptual model (SCM) ' be prepared for this site to (1) identify the source(s) of contamination; 2) determine the nature and the extent of contamination; 3) identify fate and transport characteristics of the site; 4) specify- potential exposure pathways; and 5) identify potential receptors that may be impacted by the contamination.-Results of-the SCM will assist in determining -if additional•data points (i.e. soil.,- borings oil._borings and ground water monitoring wells)are warranted,or if the site investigation has progressed towards site closure. 1 ' Advanced Geo Env!ronmental,Inc.