ARCHIVED REPORTS XR0005791 - Laserfiche WebLink

Home Browse Search

• levels, since there was no soil contamination indicated. 3. The levels of contamination measured in MTS #3 also increased dramatically between April & July. Although this well is closet to the removed UST' s, the hydraulic gradient as measured should move any residual gasoline compounds away from the well, not towards it. 4. The hydraulic gradients measured in April & July are in close agreement with regional data, but additional monitoring is needed in order to confirm that the gradient is fairly con- stant. CONCLUSIONS: Based on data obtained to date, the following conclusions appear justified; I. The high levels of BTEX & gasoline measured in water samples does not correlate with other available data, and an offsite source of contamination to the west and/or northwest is strongly ® indicated. 2 Additional site assessment is not warranted at this time, except for continuing quarterly groundwater monitoring. 3. Remediation of the soil & water on the property cannot be justified until the source(s) of contamination can be located. RECOMMENDATIONS: 1 Continue quarterly monitoring for at least an additional 6 months, or until sufficient data is obtained to suggest the next course of action. 2. The County EHD should make an intensive search of all avail- ible records in an effort to locate the potential source or sources of the contamination. 3. Based on the information obtained to date, a major source or sources of the groundwater degradation appears to be from an off- site location. Until such source(s) are identified, any program to clean up the soil & groundwater beneath the site is not recom- mended. In correspondence dated August 12, 1993, the County EHD stated that a workplan for soil remediation must be submitted by October • 18. On August 17,, we requested an extension until February 18, 2