New Emergency Services Mystery Cache

A short puzzle followed by a neat geocache. Container is not located at above coordinates.

Recently the City of Richmond updated the Richmond Fire Hall No. 2 at No. 2 Road and Steveston Highway. You can read about this here: http://www.richmond.ca/__shared/assets/susbrochure37496.PDF. In order to serve you better, you no longer have to call 911 and rather call the new, easy to remember emergency services number. Please memorize this number as it may save your life one day.

A test to make sure you memorized the number follows. Do the math. It may lead to some container in a tree or whatever.

1. 5-3-18-10-14
2. 11
3. 1
4. 17
5. 9-14-18
6. 8
7. 15
8. 3
9. 18
10. 20
11. 1
12. 4
13. 12
14. 10+14+3+2
15. 20-14-15

You can validate your puzzle solution with certitude.