[Martha's Vineyard] The Sheriff’s Meadow Foundation this week issued a public apology and launched an overhaul of its land management practices following the revelation that large numbers of trees and other plants had been dug up from two of its preserves and used to landscape an exclusive private property on the North Shore. *** The two foundation properties, the Caroline Tuthill Preserve in Edgartown and the Priscilla Hancock Meadow in Chilmark, were left damaged by heavy earth moving equipment brought in by contractors hired to landscape the 30-acre property of Dirk Ziff near Lambert’s Cove in West Tisbury.