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Asphalt Paving Co <br /> February 25, 2019 <br /> Page 2 of 2 <br /> Conclusion <br /> From a geologic perspective, the intruded basalt is surrounded by relatively impermeable shale <br /> acting as an aquitard. Due to this geologic setting, water entrained within the basalt will act as a <br /> "closed" local system and will be isolated from the larger regional groundwater table. <br /> During our 2013 investigation, water measurements indicated a dry hole to a depth greater than <br /> 100 ft bgs in borehole BA-5. Borehole BA-5 is adjacent to the low point within the quarry where <br /> standing water has been indicated. The dry conditions observed in nearby boring BA-5 <br /> demonstrate that the observed water surface at the bottom of the quarry is not representative of <br /> exposed groundwater. <br /> It is our opinion that observed surface water in the quarry is driven by local weather patterns. <br /> The low permeability of the basalt results in very low seepage rates of rainwater/snowmelt into <br /> the basalt formation exposed at the ground surface. <br /> We appreciate the opportunity to work with you on this project. If we can be of further <br /> assistance, or if you have any questions, please contact our office. <br /> Sincerely, <br /> BRIERLEY ASS$ TES <br /> s <br /> • j� <br /> Rebecc Q Stev�uehrl PE <br /> Associate '`F'••. S��.••'�� Principal <br /> ss�aNAl ENG�� <br /> Attachments: Figure 1 —Boring Location Map <br /> BRIERLEY <br /> ASSOCIATES <br /> Creoting Spoce Underground <br />