9610 19TH AVE SE NEXTEL ANTENNA Geotech Report 2018-01-02 MF Import

8V:7i 66� 9T�80 3111 X21 NEXTEL ('.ommun(callons, Inc. P.ugust 16,1999 Vi6E TZ8 90Z�NOI1tiJ0"1 &91 M-13127-0 Paye 2 Furthermore, the nature and extent of any sucF� varlationswill riot become evident untll construc6on activities have begun. If significar.' variations are observed at that Gme, we may need to modify our condusions and recommenda4ons to reflect actual conditions. 2 ] Soil Boring Procedures Our exploratory boring was advanced utilizing a hollow stem auger (HSA) method to a depth af approximately 16 feet using a truck-mounted driil rig operated by an independent drilling company workingundersubconiracttoAGRAEarth�Envfronmental,lnc.(AGRA). Ageotechnlcalengineer from our firm continuously obsened the boring, Ingged ihe subsuAace condiifons, and collected representative soil samples. All samples were stored in wateAlght containers and later transported toourlaboratoryforfurlhervisual examinatlon and testlng, as deemed necessary. Afterthe boring was completed, the borehole was backfillad with a mixture of bentonite chips and soil wttings. Throughout the drilling operation, soil samples were obtained at 2'�- to 5-foot depth intervals by means of the Standard Penetrd6on Test (SPl) per ASlM:O-1586. This testing and sampling procedure conststs of driving a standard 2-inch-0lameter steei spiit-spoon sampler 18 inches into the soil with a 140-pound hammer free-falling 30 fnches. The number of blows requlred to drive the sampler through each 6-inch interval is counted, and the total number of bbws strudc during the final 12 inches Is recorded as the Standard Penetration Resistance, o� "SPT blow counk' If a total of 50 blows is struck within any 6-fnch interval, the driving is stopped and the blow count ls recorded as 50 blows for ihe actual penetratlon distance. 'Fhe resulting Standarcf Penetration Resistance values indicate fhe reladve density of granuiar soils and the relative consistency of cohes(ve soils. The enclosed Boring Log descrihes the verdcal sequence of soils and materials encountered in each boring, based primarily bn our field classificatlons and supported by our subsequent laboratory axamfnadon and testfng. Where a sal contact was observed to be gradational, �ur log indicates the average contad depth, Where a soil type changed between sample intervals, we inferred the contact depfh. Our log also graphically indicates the blow count, sample type, sample number, and approxlmate depth of each soil sample•obtained from fhe borings, as wep es any laboratory tests performed on these soil samples. It any groundwater was encountered in a borehole, the approximate groundwater depth is depicted on the boring tog. Groundwater depth estlmetes are typically based on the mo(sture content of soil samples, the wetted height on fhe drilling rods, and the water level measured in the borehole after the auper has been extraded. 3.0 SITE CONDI110NS The foilowing sections of text preseni our observatlons, measurements, flndings, and interpretations regarding surtace, soil, groundwater, and teismic conditlons at the project site. Interprelive logs of our subsuAace expbratlons and graph(c resutts of our laboratory tests are enclosed with thfs report. s�wonuvnocroo na.a��se,m.�,�000�o�x� nw�r�n.w [,.w Mu..pa SI/9 �: �211MC� MN FlUitl3 V�tl� RdOS�Z � 66-9I-8 �A9 JAC�S