PA Sales Agreement Contract Questions

[Summer Segeleon]

http://www.pategan.net/AOS.pdf

Here's a link to the contract I'm using. My issues are on Page 5, and 12

Question about how to fill out the Sales Agreement.  The property has a private, on lot sewage system.  "B" STATUS OF SEWER : The check boxes seem to indicate ISSUES with the sewer (as per the "notices" listed afterward, depending on which box you check.) Am I understanding this wrong? Should I just check " Individual On-lot sewage disposal system (see sewage notice 1)" , or do I need to check the box with the blank line, and write "Individual on-lot sewage" to indicate that none of the notices apply?  

Question 2 : DEFAULT, TERMINATION, AND RETURN OF DEPOSITS : There is a place where you can check "SELLER IS LIMITED TO RETAINING SUMS PAID BY BUYER, INCLUDING DEPOSIT MONIES, AS LIQUIDATED DAMAGES" . I'm not sure what is standard, and how the wording before it fits in with this particular statement, if anyone could clarify.