I have a question. I'm buildig a 15" high paver patio, using EP henry conventry wall pavers for the retaining wall. I started the wall laying 2" layers of gravel mix into a 10 inch trench. My question is two fold. 1) Accidentally, I did not put down a tarp between the gravel and the subgrade. Is this a big deal? I plan on doing it for the rest of the wall but want to know if this will cause this portion to sink. There is not much clay, if any at all in the dirt, so i think it should be ok. thoughts? 2) I compacted the wall gravel down in 2" layers using a hand tamp and wetting the gravel slightly each time. I feel like i got a pretty good compaction but I was wondering if it is recommended to use something like a jumping jack. I don't want my wall sinking on me as it is the border of my patio. Any help is appreciated. Thanks.