June 01, 2007
Following the application of at least 12" of gravel over the drain pipe, 6-mil plastic was laid on top of the gravel and the entire disturbed area was backfilled. To facilitate water drainage away from the stem wall, the soil was graded to slope away from the building. As the backfill was in progress, a tamper was used to compact the soil to help prevent settling (although some settling is expected).
Once the backfill was complete, about 1" of sandy gravel was added to the disturbed area. This was for practical reasons. The gravel will help: 1) Keep dust from kicking-up during high winds. 2) Keep excessive mud off boots during the upcoming summer monsoon season. 3) Reduce soil erosion during rain.
Completion of the backfill will improve building productivity because the stem-wall on the west side (the berm side), was getting too high to reach. Also, working in the narrow confines between the earthen berm and the stem wall was a safety issue (cave-in, trip/fall).