2408 RAVENNA ST 2016-01-01 MF Import

( (- r;... .... _ _..o_.----�— . i Lo�vell Short Plet � ]une 2, 1999 NCA File No.259499 Page 5 CONCLUSIONS AND RECOMI►�NDATIONS Genersl The undvlying medium dense or bcrter sands and ati}`f or better silts are capable of,supporting the planned shvchues and pavcments. It is our opinion that the planned buildings may be supported on conventional spread footings. Foundations should extend through any fill, topsoil or loo�c surface soils and bear on thc underlying medium dense or better native sands, stiff or better silts, or stsuctural fill extending to these soils. Fil] w9s encountertd in Test Pit 2 and Test Pit 7 in the east half of the plenned building footprint in Lot Z. Overexcavation through the fill to suiteble bearing soil may be nxded in Lot � Infildation s6ould be possible in the west half of the site provided the shnllow silu sre overexcavated where encountered,end the trench in Lot 4 is no deeper than 5 feet below existing g[ade. '['ye s�ils in the pianned iafiltration are:is nre variable and silt layers may exist which could a�eet infilUation rates aud patLs. We recommend that overflows be installcd to route the water to the wetland area in the event tliat actual infiluation rate is aot sufficient. Fooring drains should be used uound�e nsidences, as the wata path cannot accurately be predicted as�d any horizontel seepege from the u:filtration system witl Ue towards the foundations. Infiltrarion will likc:y not be pos•ible in the east half of tfie site. Much of the roadway will be located rner the existing senitary uwer tench fill and undocumented fills in the surrounding area. There are areas where new fill will be placcd over loose existing fill. Zmported pit ntn or mch spalls should be used to fill the planned access roadway to the pavemrnt subg:ade level. The existing fill slope along the west property line is expected to wnsist of loose fill and should be coasidered to be a•"common"or non-sttvetural fi,ll. The ground surface should be reduced in slope angle to a maximum of 3 HorizonWl to 1 VeRical(3Fi:1�slope angle througl►additional fill placement, andJor excavarion. Rockerics could he used, but should be considered only on case specific applications. 71iat is,use and design of rackeries should be based on specitic height, georoetry and soil condidotts. Site Preparation an�Gradi�g • Il�e first step of site proparation should be to strip the su�cial topsoil in pavement end bullding areas. This stripped material should be removed from the site,or stockpiled fa later uu as iandsceping fill. Tlie underlying soils ue considered moderetely to highly moisture sensitive, and will disturb easiiy snri become difficult to work �rith when wet. Wc recommend that ea�thWrork be conducted during the drier NELSON-COUVRETTE&ASSOCIATES, 1NC. � � ......................................................... --- ............................... _....... ..!........ ...........