Please correct my Chingish?

i come from China. i am assigned to some notice writings in English. i am not sure if i write in the way that English-speaking people do. Pleasure correct any mistakes in these following writings

1 Important Notice
We have been informed by the Power Supply Bureau of Ming District that, because of repairs of circuits, there will be temporary power cut in our apartment for six hours from 9am to 3 pm on Jan,13
Property Administration Office
Longbai Apartments
2 Notice

It is to inform all the residents that the rooftop water tank is going to be cleaned from 8 am to 11 am on Saturday. Residents are advised to make preparation for the temporary water cut.
Housing Administration Office

3 Bullettin
A number of buglaries took place in our neighbourhood in the past few days. In order to maintain order and securtiy, a public security team is therefore set up. It is hoped that every resident and household be on guard and closely cooperate with the team. In emergency, please call 62308238.
Public Securtiy Team

4 Donation to Disaster Area
A couple of days ago an earthquake hit Yunnan Province and the local people therefore run short of winter clothing. The neighbourhood commitee weclome donation of cloths and quilts in the next three days
Neighbourhood Committee

5 Notice
It is reported by residents that recently a few persons who pretended to be workers from the Gas Company came to households to sell gas stoves on the pretext ot examination. Should such people come again, please immediately contact with the security guards. They will come over and interfere.
Guardroom Residential Area

Suggestions:

1. Important Notice:
please put a period after Jan.

2. Notice:
Please include a date.

3. Bulletin:
spelling ("Bulletin"), "In an emergency".

4. Donation to Disaster Area:
...and those affected need winter clothing. The neighborhood committee welcomes donation of clothes and blankets in the next three days.

5. Notice:
...people who pretended...Should such people return, please immediately contact the security guards, who will conduct an investigation to ensure everyone's safety.

Generally clear to me. Just take notice of the spellings. Well done!

You are welcome. Report It

why the hell do you need to write it in english?

Your English is good enough. It is more understandable than some English by English-speakers. The errors are very minor. Congratulations.