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�, <br /> , ` <br /> ,.s , <br /> ��. a _ �. � <br /> , . <br /> . <br /> , .,.�;��, -: _ <br /> f] N <br /> t0 � � <br /> � IMA <br /> �O � , <br /> C H <br /> Y •] N <br /> N � x <br /> K � WG-1049-01-067 <br /> y � LOJIS Corporation <br /> � N H July 18. 1991 Page 4 <br /> z <br /> o � i 3. Subgrade Preparation <br /> � � o <br /> " ' R After the completion of clearing, strinp�ng znd overexcavation, soil exposed in azeas to receive <br /> � y � strctural fill, slabs-on-grade or pavemr.n� sunaces shouid be scarified to a depth of 6 inches, <br /> qy y � moisture-conditioned to slightly above optimmn water content and compacted to tiie requirements <br /> X o m , for structural fill. <br /> � `� c� <br /> ,� � y 4. Temporlry Excavations <br /> � <br /> It is our opinion that open-cut excavation can be performed if the sides of the excavadon are <br /> sloped at an indination of 1.SH:1V (Horizontai:Vertical) or flatter (Type C soil in OSHA <br /> Excavation Rcgulations). If such slope inclination cannot be achieved it would be necessary to <br /> use temporary shoring to support the excavation. In any case, exca��ation depths including utilily <br /> trenches should comply with local, state and fedetal safery regulations. Specifically, the current <br /> i OSHA Health znd Safery Slanduds for excava!ions, 29 CFR Part 1926, should be followecl. <br /> , We understand that these regulations are to be strictly enforceci and if they aze not closely <br /> followea the owner and contractor could be liable for subst�ntial penalties. The contractor's <br /> a "responsible person, as defined in 29 CFR Part 1926" should evxlaate tlie soil exposed in the <br /> i��, excavations as part of the contnctor's safety procedures. <br /> = We recommend that a representative from Kaldveer Associates moniror the soils exposed in all <br /> i excavations and provide engineering services for such slopes. This will provide an opportunity <br /> � �� to monitor the soil rypes encountered and to modify the excavation slopes as necessary. It also <br /> �.� � offers an opportunity to verify the stabiliry of the excavation slopes during construction. <br /> 5, Fi111fatcrial <br /> ��'. � <br /> � �'� ° The moiswre content of the site soils at the time of our exploration was above optimum. On-site <br /> soils below the stripped layer and having an organic content of less than 3 percent by volume <br /> ' � ' ' and aze not oil-contaminated can be used as fill if the moismre content allows. Based on our <br /> +.� � ' exploratory borings, it is our opinion that the on-site soils cannot be used as fiil because of its <br /> organic content and oceasional cunstruction debris However, hceause of its variauon this non- <br /> � � <br /> engineered fill should be examined during excavation to determiue its suitability as sWcturai fill. <br /> `�� All structural fill should consis[ of a free-draining, granulaz organio-free material with a <br /> �, , � m�imum size of three inchcs. It shnuld contain less than 5 percent fines (silt and clay-size <br /> i .,,,� particles passing the No. 2�i0 mesh sieve). <br /> \ `� � ,111 fiil n��erial should be pla:r_d at or near the optimum moismre co�uent. If the m�terials are <br /> [co we� ?o Ue:ompacted to the requi:ed degree, it will be necessary to aiy rhem or repiace them <br /> with a mor.; granular materiaL Pill matenals can be dried by aeration or by intermixing cement <br /> powder to absorb excess moismre. <br /> KaldveerAssociatr;.: <br />