4626 HARBOR LN 2018-01-02 MF Import

Gcotechnical Construction Monitoring Final Letter Fox Residence Underpinning and Retaining Wall April 24, 2013 NGA File No. 8592B 13 Inge 3 results indicated 90 to greater than 95 percent compaction or better as determined by ASTM D-1557 (Modified Proctor). In our opinion, the backfrll was well compacted, and the gcogrid was properly placed. During a follow up site visit on April 18, 2013, we discussed with you and your contractor that run-off from the existing driveway should be collected in a new catch basin and routed into a dispersion trench, a minimum of 16 feet long to be placed along the southern side of the dry well location. ']'he dispersal trench should be setback a minimum of 20 feet from the steep west -facing slope below the backyard. We also recommended placing jute netting and hydroseed on all exposed surfaces. We have not been to the site since the 4118/13 visit, but we understand that our rcconuncndations for the dispersal trench and soil coverings have been implemented. Conclusions Based on our part -tine observations it is our opinion that the earthwork activities nt this site, including residence foundation underpinning, Ultra Block wall construction, drainage and structural tills were prepared in general accordance with our recommendations and the approved plans. We recommend that all erosion control and drainage systems be inspected and maintained on a regular basis. Slope and vegetation management should be performed as recommended in our report and approved by the City. We should be promptly contacted should any signs of distress be observed within the backyard or on the slope. 0.0-0 NELSON GEOTECHNICAL ASSOCIATES, INC,