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Martin Marietta seeks Sunflower Quarry expansion; commissioners and neighbors raise blasting, dust and growth concerns
Summary
Martin Marietta Kansas City LLC asked Johnson County planning staff for a conditional‑use permit amendment to expand the Sunflower Quarry eastward and continue operations; staff said the expansion meets required setbacks and includes reclamation and dust‑control measures, while neighbors raised concerns about blasting vibration and dust.
Sean Penley, county planning staff, presented an application from Martin Marietta Kansas City LLC for an amendment to the conditional use permit authorizing continued operation and expansion of Sunflower Quarry (application w24-436‑cup). The quarry site is on leased property totaling about 885 acres; current permitted quarry limits total roughly 353 acres. The applicant proposes expanding the permitted mining area to the east by about 40.57 acres (labeled 2NEE in staff maps). Martin Marietta requested a 10‑year term for the amended permit.
Penley told the Board that the quarry’s first CUP was approved in 1991, with four renewals since. He said the 2020 CUP allowed an additional 53 acres and set a five‑year term…
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