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' 26 October 2000 AGE-NC Project No. 98-0466 Page 9 of 10 the Millworks building septic leach field slightly exceed regulatory guid lines as noted above.AGE ' does not believe that these concentrations, encountered in the area anticipated to have the highest concentrations, signal a significant concern; however, upon review of a complete site summary report, the RWQCB may require additional assessment of ground wa er in the leach filed areas before consideration of site closure. ' 5.0. RECOMMENDATIONS ' Based on the above discussion of findings, AGE recommends the followir g actions: 5.1 WESTERN DITCH AREA AGE recommends that shallow soil samples be collected in the former stem cleaning area and in the south portion of the ditch to define the extent of soil impacted by chromium and motor oil for possible removal of soil exceeding industrial PRGs for chromium.AGE does not expect the volume of impacted soil to be significant.A drill rig should be employed to obtain a water sample in the area to analyze for ' metals, petroleum hydrocarbons, PCP/TCP, and formaldehyde. AGE does not anticipate significant contamination in the area,but proposes the testing to address potential concern by the RWQCB. 5.2 MAINTENANCE BUILDING AND MILLWORK SEPTIC LEACH FIELDS AREAS ' AGE recommends use of a drill rig to obtain a water sample in the area to complete the assessment for the chemicals of concern noted above. Although the exact location of the leach field is not known, favorable analytical results from a ground water sample in the septic tank area would support an interpretation of minimal impact on ground water by suspect materials potentially released through the leach field. ' Groundwater in the millwork building septic leach field area contained formaldehyde at a concentration slightly exceeding the action level for drinking water, and may contain lead and chromium at concentrations that slightly exceed drinking water MCLs.The data for the last two analytes were from ' unfiltered samples and maybe total metals rather than dissolved metals concentrations.Due to the minor degree of the excursions past the MCLS in the area that intuitively is likely to be most contaminated, AGE recommends no further assessment in this area pending direction fro}n the RWQCB. 6.0. LIMITATIONS ' Our professional services were performed using that degree of care and s ill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based mainly ' upon analytical results provided by an independent laboratory. Evaluations of the geologic/ Advanced GeoEnvironmental,Inc.