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DAVID L. NELSON AND ASSOCIATES, INC. <br /> . Consulting Enginecring Geology <br /> Januaiw 26, 1987 <br /> Project No. 0387 <br /> Page three <br /> The implementation of these developments should control al! surface water, and <br /> direct any accumulated waters into th? main drainge systems, away from the <br /> ecology block '++ali' area. Initialiy, ue suggest that the fill soils presently <br /> occurring behind the 'wall ' be removed to a distance 18" to 24" wide behind the <br /> 'wall ' , and replaced with suitable drainage gravel. This drainage blanket arF+a <br /> should extena tu at least 12" from the surface, and be covered with a geotextile <br /> (stabilizrtion/filtration fabric), prior to placer,ient of a surficial 12" of <br /> on-site soils. Surface grading should be performed so that all surface water <br /> flows back from the wall to the drainage collection areas. The surface area <br /> should be vegetated with appropriate erosion resistant materials. Prior to 1:he <br /> placement of the extentlon of the concrete driveway, the portion which occurs <br /> above artificlal fill should be prepared tl�ro�gh placement of granular, 'pit-run' <br /> type soils. This should aid in minimizing post-construction settlements and <br /> allow proper drainage. The pit-run should be well compacted into place. We <br /> do not suggest excessive compaction within a distance of one times the wall <br /> height from the inside wall face. <br /> Absalutely r.o excessive wheel loads should be anticipated within the area of <br /> artificial fill behind the 'wall' , since the 'wall' is not engineered to resist <br /> lateral loads. This should include any dead loads or storage, which may create <br /> excessive pressures against the 'wall ' area. <br /> Additional Notes <br /> We suggest the geotechnicai consultant be available to observe and reporc all <br /> findings during the excavation and replacement phases of site earthwork. The <br /> observations performed may influence opinions and recomnendations expressed <br /> herein, since subsurface analysis and exploration •�as not performed. We would <br /> suggest that the observations include times �uring earthwork and preparation <br /> of the site, as well as the finish development, including drainage. <br /> • Thank you for the opportunity to be of service. �f you have any questions, <br /> feel free to call on us at any time. <br /> Sincerel , <br /> DAV . L. ,N �A ES, INC. <br /> / <br /> i <br /> D id L. elson, PG - <br /> Professional Engineering �eologist <br /> DLN:kmn - <br />