With large piles, there is usually evidence of who dropped it...mail addresses, vendor invoices, delivery destinations, etc. If it is safe, please take these photos, the City of Oakland can follow-through on this for fines....upload them on SeeClickFix and include "Illegal Dumper Evidence Included" so the City Representatives will key in on the possibility of prosecution.

City of Oakland Public Works Department addressed this issue on 06/26/2015, service request # 587879.