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PPP 0'15 '96 12:21 FM f=OTH 'a VPH 1 4 E P :- Foth &Van Dyke Nvor engineers • archltocts • scirists April 4, 1996 Dane County Zoning and Natural Resources Committee City-County Building Room 118 210 Martin Luther King Jr. Boulevard Madison, WI 53709 Dear Zoning and Natural Resources Committee Members: Re: Conditional Use Permit 1298 This letter provides information regarding questions about the Conditional Use Permit (CUP) No. 1298 that were raised during the April 2, 1996, Working Committee meeti:ig, There were questions regarding the depth to groundwater as it relates to the proposed bottom of the quarry. The information that is available to us indicates that groundwater is at Elevation 990 under the high point of the property based on an unpublished geologic report for the area. Well construction reports obtained from the Wisconsin Geological and Natural History Survey from the section in which the proposed quarry would be located indicate that the depth to water in private water supply wells varies from 20 to 100 feet • below the ground. The owner of the house on the property. Mr. Bud Reiner, has reported that it is approximately 60 feet to water in his well. We estimate the elevation of the water table to be at 940 at the house. The unpublished geologic report and the information from Mr. Reiner are consistent with the generally recognized condition that the water table surface elevation reflects the land surface elevation. A question was asked regarding the impact of blasting on groundwater. From a physical perspective, we would expect that there would be slight instantaneous increase in water levels in wells due to the compression wave from the blast. This would dissipate immediately after the blast and the wells would return to their normal water levels. The effect in the wells would be essentially unnoticed. As far as water quality issues related to blasting, we would expect no change. The materials used to do the blasting are essentially consumed by the blast, Any minute quantities of chemicals left will be on the limestone that is crushed and removed from t$e site. There was a question regarding the size of the quarry operation as it relates to air monitoring requirements. The existing quarry at CUP 788 has had an annual production of between 35,000 and 72,000 tons per year. Mr. Ziegler reports that it is his intention to AM B 2195 Z0041L-DACO U N14000 406 Science DrIve.Sulte 400 • Mndlson.W1.5.3711-1068 • 608•238.4781 • Fax:608.238.4683