4805 BELVEDERE AVE 2016-01-01 MF Import

Subsurface Ecp(oration, Geologir Haard, and 8ef vcAcrc Lois Enst Preliminary Georechni ��a( Engineering Rrpvn Evrreu, N'ashin !on Proiect and Sire Conditians 3.1 Exploration Pits L•xploration pits were excavated with a track-mounted excavator. The pits permitted direct, visual observation of subsurface conditions. Materials encountered in the exploration pits were studied and classified in the �eld b;� an en�ineering geologist from our firm. A1l exploration pits were backfilled immediately after examination and logging. Select^.1 samples were then transported to our laboratory for further visual classification and testing, as necessary. 3.2 Gxpioration Borin�s Two exploration borings were completed for this study Uy advancing a 3'h-inch inside- diameter, hollow-stem auger with a limited access, track-mounted drill rig. Exploration boring EB-1 was drilled near the top of the slope r,n Lot 33 to a depth of approximately 30 feet. During the drilling process, samples we�e obtained on a continuous basis throughout the depth explored in this boring. In order to obtain subsurface data over a greater depth, exploration boring EB-2 was driiled t� a depth of approximately 96 feet direcAy adjacent to exploration boring EB-1. Drilling of both borings H�as continuously observed and logged by an engineering geologist from our firm. The exploration logs presented in the Appendix are based on the field logs, drilling action, and inspection of the samples secured. Disturbed but representative samples were obtained by using Qie Standard Penetration Test procedure in accordance ti•ith ASTM:D 1586. This test and sampling method consists of driving a standard 2-inch outside-diameter, split-barrel sampler a distance of 18 inches into the soil with a 1�:0-pound hammer free-falling a distance of 30 inches. The number of blows for each 6-inch inten�al is recor�ed and the number of blo��s required to drive Ihe sampler the final 12 inchrs is known as the Standard Prnetration Resistance ("N") or blow� count. If a total of $0 is rrcorded within one 6-inch interval, the blow count is recorded as the number o( blows for the correspondine numbcr of inches of penctration. The resistance, or N-��alue, provides a measure of the relative density of granular soils or the relati��e consistency of cohe�ive soils; these values ate ;�otted on the attached boring logs. The samples obtained from the sptit-barrel sampler were dassified in the field and representative portions placed in watertight containers. The samples werc then transported [o our lahoratarv for further visual classification and lahoratory testing, >s necessary. �3.0 SUI3SURPACG CONDITIONS Suhsurface conditions at the project site ::�ere inferred (rom [he field explorations accomplished far this swdy, a��isual reconnaissance of the site, and review of applicable geologic literature. A� shnti•n on the �.cld logs, thc exploration pits gencrally encountered medium dense to very �Jcn�.c s;+n�i i��rrl;un in ��me arc:is h� sti(( u� harJ sil�. The following section presents more _ - ____ =_= _-_ — __- ___--=- __-_ - M�vrh `. '�✓�� ASSOCI.iTED [dR77f SCIENCES, lNC. �;��,,,.��,:�„� ��,�„�.�.:,,,�,,�=��r ��_�. Page3