Oconee County - Departments - Rock QuarryPhysical Address Oconee County Rock Quarry 686 Rock Crusher Road Walhalla, SC 29691. Mailing Address Oconee County Rock Quarry 686 Rock Crusher Road Walhalla, SC 29691. Email: pmccalloconeesc. Staff Info. Quarry Manager D. Richard Martin Quarry Foreman C. Mickey Kerr Office Managerrock crusher valhalla sc,Why Rock Screens are Important to Your Rock Crushing CompanyJul 11, 2017 . Chris Andrews is an account manager for the Mellott Company in Columbia, SC. He was awarded an engineering / physics degree from West ia Wesleyan College. Chris was an engineer in the automotive industry for more than a decade before working for the corporate office at . Once Chris.