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Ms. Glenda Roe 3 July 16, 1990 <br /> Item C: Monitoring Wells <br /> In Canonie's opinion, additional construction of ground water monitoring <br /> wells is not necessary. The former tank was removed to allow construction <br /> of a building addition, and therefore construction of a monitoring well is <br /> not practical . MW-2 still exists and can be used if necessary to monitor <br /> t <br /> Item D: Well Logs <br /> Well construction details and boring logs were not submitted since the <br /> wells were not constructed as part of tank clean-up activities. Rather, <br /> two monitoring wells were constructed at the site by Beta Associates in <br /> August, 1987 prior to PDM's purchase of the site in November, 1987. The <br /> boring logs for these wells have been included as an attachment to this <br /> letter. <br /> Item E: Methodoloav <br /> The methodology for determining the limits of soil excavation are described <br /> in Item A. Sampling of Well MW-2 has indicated nondetectable <br /> concentrations of diesel fuel suggesting that no significant impact on the <br /> shallow ground water (depth to ground water is approximately 10 feet) . <br /> Boring logs for the wells constructed by Beta Associates have been included <br /> as an attachment to this letter. There is limited information available to <br /> develop geologic cross-sections. <br /> All work previously conducted by Canonie or which will be conducted by <br /> Canonie in the future on this project will be performed under the direction <br /> of a registered professional engineer. All reports requiring submittal to <br /> the county health department will bear this engineer's stamp. <br /> Conclusions <br /> As stated previously in this letter, we do not see the value of additional <br /> investigative efforts. A well down gradient of the former tank location <br /> showed no-detectable concentrations of diesel fuel at a' time when the <br /> source area had been removed. Since a building now exists in this area, <br /> little or no potential for leaching of residual fuel from soils, into <br /> ground water, exists. <br /> A Health and Safety plan was submitted under separate cover with the <br /> proposal for remediation of the former diesel storage tank location. A <br /> Health and Safety Plan will be submitted with any proposal for any future <br /> field work such as treatment of the stockpiled soils at the site. <br /> CanouieEnvironmental <br />