WASHINGTON -- On more than 10,000 acres of drained swampland in western New York, Maureen Torrey's family farm grows an assortment of vegetables in the dark, nutrient-rich soil known as "Elba muck." Like other farms in the area, Torrey Farms Inc. of Elba, N.Y., depends on seasonal labor, mainly undocumented field hands from Mexico, to pick, package and ship its cabbage, cucumbers, squash, green beans and onions throughout the nation.