On Monday County Supervisor Lisa Hughes alerted the commissioners {that a} report from Schnabel Engineering had been acquired. The report was requested by the county to evaluate potential impacts of the proposed Three Oaks Quarry on the close by Memorial Park, Lake Hampton and the Hood Chamberlain Dam in addition to West Yadkin Elementary College.

Hughes didn’t go over the report through the public portion of the assembly, however did ship a digital copy to The Yadkin Ripple for evaluation.

The report abstract states that “Schnabel can’t make a full dedication of the potential impacts that operation and improvement of Three Oaks Quarry can have on surrounding assets. Such a dedication requires site-specific information and analyses in addition to extra design particulars.”

The report does present a “abstract of our observations, conclusions, and proposals, together with the information wanted for additional analysis of varied points of the challenge primarily based on the data supplied so far.”

“Based mostly on our expertise, the data supplied signifies that Three Oaks plans to fulfill, or exceed, the usual of take care of comparable mining operations on this area,” the report states. “This doesn’t imply that there won’t be impacts to the encircling assets. It is crucial for the County to place plans and/or agreements in place with Three Oaks that may both keep away from or mitigate potential points. It has been our expertise that even essentially the most completely deliberate initiatives encounter surprising circumstances, and the County ought to be ready for these prospects. There also needs to be an open communication channel between the County and Three Oaks to allow decision for any impacts to the environment that ought to come up, and plans in place to handle widespread points that might happen from the quarrying course of.”

In regard to potential impacts on the Hood Chamberlain dam, previously known as the 5D dam, which created the reservoir now often called Lake Hampton, the report states, “Because of the distance between the proposed quarry and the dam we think about the opportunity of blasting negatively impacting the buildings of the dam to be not possible. Dam 5D was designed and constructed to face up to an earthquake with peak floor accelerations of as much as 0.15g. Floor motions related to blasting are anticipated to evolve with the bounds established by the USBM RI 8507 to restrict impacts to close by buildings to the quarry which ought to be far smaller than what the dam is designed to face up to. The dam location shouldn’t be the closest construction to the quarry web site and blasts from the quarry are usually not anticipated to be of enough length or measurement to trigger injury to the construction of the dam.”

Water high quality might be a possible concern nonetheless, based on the report.

“We perceive that Lake Hampton and Dam 5D have been constructed to offer three main functions: flood management, water provide, and recreation. Resulting from the truth that the proposed quarry is situated on the headwaters of one of many unnamed tributaries to the lake, the quarry has the potential to influence each water ranges throughout the lake and the standard of the water provide,” states the Schnabel report. “Most of the particulars related to the management of water and water high quality throughout the quarry might be detailed throughout the required NPDES allow, which has not been obtained/reviewed. Moreover, essential web site particular groundwater particulars might be calculated after efficiency of hydrogeologic testing. The outcomes of testing haven’t been supplied for our evaluation.”

The report goes on to notice different points that might come up doubtlessly affecting water within the space.

”The Three Oaks Quarry Operations Plan (April 29, 2022) notes that ‘there are not any chemical compounds, toxins, pollution, or comparable substances generated or emitted within the quarry operations’ and states the quarry can have minimal influence on Lake Hampton over time. Moreover, ‘water discharged from the positioning might be routed via an accepted level discharge construction’ which ‘might be licensed by way of a Nationwide Pollutant Discharge Elimination System (NPDES) issued by the North Carolina Division of Environmental High quality. The NPDES allow would require the Three Oaks Quarry to divert all extra storm water to the diversion swales and sediment basins, in addition to perform in depth sampling, evaluation, and reporting, all of which might be publicly obtainable.’ Whereas combination mining is usually not a polluting course of there are specific points that have to be evaluated. First, there might be plenty of items of heavy equipment working on the quarry and there’ll probably be associated infrastructure to help these machines (underground storage tanks for fuel, and so on.). These machines have to be effectively maintained and correctly saved whereas not in use to stop leaks and spills from contaminating the groundwater provide. One other potential consideration is acid mine drainage. This happens as a result of particular rock sorts kind acidic water after being uncovered to oxygen (and water) on the floor floor. Due to this fact, you will need to take a look at the rock for acid potential and to watch the pH of water seeping from stockpiles, and throughout the quarry, which will have acid-producing rock. Acid mine drainage have to be recognized and mitigated earlier than it has unfavourable impacts on groundwater high quality. Resulting from the truth that the quarry will function a topographic low level, water will naturally movement in the direction of it, and current groundwater gradients across the rim of the quarry will ultimately grade into the quarry. Because of this, groundwater contaminants situated in or alongside the perimeter of the quarry could movement into the quarry. Due to this fact, potential sources of contamination within the neighborhood of the proposed quarry ought to be recognized and mitigated previous to improvement. Equally, wetlands instantly surrounding the quarry are more likely to be impacted if groundwater ranges drop. Wetlands present a key buffer for water high quality and depletion of current wetlands may result in decreased water high quality over time. Ideally, the rock throughout the quarry might be thought of “tight”, which means that there are minimal water inflows from surrounding groundwater and subsequently minimal drop in groundwater ranges. Nonetheless, with out extra information we can’t decide if that is probably at this location. groundwater ranges. Nonetheless, with out extra information we can’t decide if that is probably at this location. Of the current quarries that now we have been concerned with, three have had little to no water inflows, and one has had important water inflows via the rock.”

In regard to blasting, the Schnabel report additionally notes that “fly rock” might be a possible concern.

The report may be considered in its entirety on the Yadkin County web site at https://www.yadkincountync.gov/DocumentCenter/View/5567/Schnabel-2022-07-01-Three-Oaks-Quarry-Evaluation-Support_FINAL-YC-Requested-Document?bidId=

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