求翻译：（7）场地排水沟、排水井及沉淀井，定期派专人进行疏通清理，保持畅通。建筑垃圾必须集中堆放，联系环保部门定期清理。是什么意思？

(7), site drainage, drainage and precipitation of wells, regular dredging sent clean, smooth flow. Construction waste must set piling up, contact the Environmental Protection Department cleaned regularly.

( 7) site drainage ditches, drainage wells and sink wells, regularly send specialists to dredge cleanup, smooth. building garbage dumps, links must be focused on environmental protection departments regularly cleaned.

(7) location drain, the dry well and the precipitation well, the regular faction specialist carries on the unblock cleaning up, the maintenance is unimpeded.Construction trash must concentrate the stack, the relation environmental protection department regular cleaning up.

(7), site drainage, drainage and precipitation of wells, regular dredging sent clean, smooth flow. Construction waste must set piling up, contact the Environmental Protection Department cleaned regularly.

(7), site drainage, drainage and precipitation of wells, regular dredging sent clean, smooth flow. Construction waste must set piling up, contact the Environmental Protection Department cleaned regularly.