WORK PLANS - Laserfiche WebLink

Home Browse Search

3 M Color Spoc, Inc. August 16, 1991 (M88168G) CONCLUSIONS AND RECOMMENDATIONS Current data are unclear as to the predominant ground water flow direction in the vicinity of the former UST location. Of the four active wells, three are to the northwest, including one reported to withdraw water for longer periods of time and at higher races than the well to the south. However, of the trace concentrations of fuel constituents detected in samples from all the wells, the concentrations are highest in the southernmost well. In fact, the level, gradient, and flow direction may change depending upon the pumping schedules of these nearby wells. More data collection and analysis would be necessary toy/ characterize the dynamic hydrogeology at the site. The nearby wells' pumping schedules, discharge rates, and wellhead elevations would need to be considered along with water level measurements taken over time. Existing evidence suggests that hydrocarbon contamination from the former UST has not migrated or leached through the soil into the ground water and will not in the future. The UST and the adjacent soil to a depth of apps ' - mately 15 feet have been excavated and removed from the site. Confirmatory =`mss samples from the base of the excavation contained fuel constituents at concentrations orders of magnitude below DHS action levels for drinking water (see SGD report dated February 1990 listed above) . Eight soil samples from four drill holes flanking the former UST location contained very low concentrations of fuel constituents, if any (see SGD report dated November 1990 listed above) . SGD continues to recommend closure of this site with respect to hydrocarbon contamination from the subject UST. CLOSURE This letter-report has been prepared for the exclusive use of Color Spot, Inc. , with specific applications to the assigned portions of the subject property. The study was conducted in accordance with generally accepted environmental protocols at this time. No other warranty, express or implied, is made. SGD is prepared to meet with Color Spot, Inc. staff and any concerned regulatory agency to discuss the results and recommendations described herein. Should you have any questions, please contact the undersigned.