chalking rules

1. Chalking must take place on concrete sidewalks, not on buildings, steps or other University-owned property. Chalking is prohibited on all vertical surfaces, buildings, walls, benches, picnic tables, signs, poles, newsstands, columns, bus stops, mailboxes, light poles and trees.
2. The chalking must be on a horizontal surface not covered by an overhang. Chalking must be done in open areas that can be directly washed by rain.
3. Chalking may be placed for a maximum of 10 days.
4. The material used to mark the walk must be water-soluble chalk (sidewalk chalk). The use of markers, paints, oil-based products, or spray chalk is prohibited.
5. Chalking must contain the name or be signed by the name of the organization sponsoring it. 
6. Chalking cannot interfere with another message that has already been chalked

That was from the university of MN

POLICIES, PROCEDURES & GUIDELINES: Smith College Policy on Chalking Smith College allows chalking on campus under the following guidelines: Only erasable chalk may be used (grease-based chalk is not permitted). Chalking may be done only on asphalt roads and walkways. Chalkings should be signed with the full name of the person or group responsible. Other individuals or groups within the community may add to the chalkings or remove them. The administration of the college may remove all the chalkings in any specific area of campus. I have no idea what University of MN #3 means, so that one can be thrown out, but otherwise I hereby apply the combination of all of these guidelines for chalking in this class.  Evidence of your group breaking these very generous rules will result in grade punishment for the whole group, up to and including failing the class for serious infractions like permanently defacing any university property, such as using any paint product, marker product, grease based product, spray delivered product.  Each group needs to come up with a symbol so you can easily and quickly sign your chalkings.  Also, I want to make sure it is clear that you are not to alter the chalkings of other groups, but that it should be assumed that students and administration will alter and/or erase your chalking.  Finally, this is not a rule, but please make sure you know what you are going to write before you start.  Mistakes in fact, logic, and grammar in chalking can help people that already judge the group to further solidify their stereotypes.