Laserfiche WebLink
i � <br /> CASCADE GEOTECHNICAL <br /> June 30, 1991 <br /> Lyle Blank <br /> Job No. 9305-16G <br /> Page 8 <br /> , to the fine-grained nature of the soils. If the optimum moiature <br /> 'I content cannot be maintained, the soils may have to be discardad <br /> and imported fill may be reguired. The topsoil noted in the tast <br /> Ipits is unsuitable for use as structural fill and should be removed <br /> from the buildinq area. <br /> � Imported fill should meet the following gradation: <br /> Isisvs eise Purcent psasina <br /> 4 inch 100 <br /> I I4 25 - 75 <br /> /2u0 10 maximum <br /> If a wet subgrade is encountered during fill placement, an all- <br /> I weather fill having less than five (5) percent passing the /200 <br /> sieve, based on the fraction passing the /4 sieve, may be <br /> Inecessary. <br /> I We recommend nsing lifts not exceeding twelve (12) inches in loose <br /> thickness and compacting to at least 95 percent of the ASTM D-1557 <br /> maximum dry density value in the foundation and the slab floor <br /> I areas. <br /> ! <br /> IAralnaqe <br /> I We recommend placing a four (4) inch diameter, riyid, perforated <br /> drain pipe which is bedded in several inches of pea qravel and is <br /> � backfilled with at least twelve (12) inches of pea gravel, alonq <br /> the base of the exterior footings and tightlining it to a suitable <br /> outlet. The roof drains should also be tightlined to a suitable <br /> Ioutlet separately from the footing drains. <br /> IWe understand that you would like to outlet the drains into the <br /> I <br />