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, Subsurjace Ecplomtion. Geobgie Ha:ard. and <br /> Aeuml�, �aK�ta!Enginetring Report <br /> ' }l�usiny Nope Phase f! Dtstgn Recommendarlpns <br /> E��rrR. {liuhingrort <br /> ' 1� 4 Rackerv Facin�s. � <br /> bz used co prevent erosion of sm�ll cut or fill slopes; however, they are not ! <br /> Rockeries may est that they not be used it►place of retaininEµ'��5� ! <br /> , eagineered stN��ures, and a�e strongly sugg <br /> especia►ly �vhere important facilitia ure adjacent to chem. For this project, a rockery facing a ; <br /> GeogridT" reinforced fill bunress couid be used aloo8 tt►e steep westem slope. However, <br /> , mociular block wall facings are generally more stable, easier to constn►ct, and require less �I <br /> future maintenance. I <br /> , ' <br /> IIuildings should be set back from rockeries so tbatWe Hc�nax�°dbu�dings be set back I <br /> b�C o; the rockery dces not intersect the footinB• <br /> from the front face of ti�e rockery (or modular block wall) a d�sg 7e equal to the height of the <br /> , rockery or wall• Roc:cery c°nstn��tion is an art that depends lar �i �u the skill of the builder. <br /> We w�ould li}:e to point out that ald�ough rockeries are commonly used, they occas�onally have <br /> difficulties and should be considered a fong-term muintenance item. Cue must be exercised in <br /> � selectine a rock source, since some of the material supplied is soft and disintegrates in a � <br /> relatively short period of time• SamP�es of rock can be tested by AESI prior to theit use in � <br /> ' rockeries. If a rockery of 4 feet high or less is specified, it usually will likely not require a <br /> permit. How'ever, far this application, we anticipate rockeries will exceed 4 feet in hcight• In ' <br /> addicioa, the conuactor should confirm cha� his configuration conforms to cuaent City of i <br /> ' Everett specifications. AESI can provide site-specific GeogridT" reinforced rockery desiga <br /> criteria if requested. I <br /> ' 13.0 FLOOR SUPPORT <br /> ' A slab-on-erade floor may be constructed direcdy on compacted structural fill or pre-rolled, <br /> medium dense nacural ground. The floor should be cast atop a minimum of 4 inches of <br /> 1 washed, uniformly graded granulithic material or pea gravel to act as a capillary break. Areas <br /> of slab subgrade that are disturbed (loosened) during construction should be compacted to a <br /> non-yielding condicion pnor to placemenry;ous Pmoisturee barrietc Tor o erwise Ss a��als The <br /> I protected from dampness by an impe <br /> � impervious barrier should be placed becween the capillary break material and an optional 2- to <br /> 3-inch-thick layer of sand. The sand helps to protect the vapor barrier from damage and <br /> � The eforelthe sand layer should not bele.posed�oera a or,s ow pnor to pou ng che slabs dry. <br /> 1 ' <br /> � <br /> I <br /> � ASSOGATEn EAR1N SC(ENCE$ 1NC. <br /> Febn+a�'i ��• -'�2 Page 14 <br /> SG1/M•XFAI7AAI-Pmjrcui70�17t9iKElNP-W:K '/� . <br /> 1 <br />