4305 RUCKER AVE 2018-01-01 MF Import

Nortli Coast Construction Compa�ty W-1260-30 , FeUruary G, 1975 Page 'I'�vo , 3. Comments on foundation design and its suitability to existing soil co�iditions, , 4. Estimates of any settlement that may occur due to foundation or floor slab loads. FI�LD �XPLORATION Tl�e subsurface suil conditions �vere explored by drilling four test , Uorings, one near eacli building corner, to depths of 9 to 10 feet belo�v the Uottom of the excavated footin� trenches which were excavated to about 6 to 9 feet below fihe adjacent grade. The borings �vere drilled using a port- , able, �ninuteman drill. Li each boring, Standard Penetration Tests �vere performed at selected intervals. The Standard Penetration Test consists of driving a 2-inch O. D, split spoon sampler 18 iiiches with a 140-pound hammer free falling a distance of 30 inches. The number of blows required to drive the sampler the last 12 inches is termed the '5tandard Penetration Resistance" (N) and is an approximate measure of the in situ relative density or con- sistency of a soil. These resistance values (N)are plotted on the right side of the borii� .logs. Samples retained in the split spoon �vere visually classi- fied in the field, placed in airtight containers and returned to our laboratory for further classification and testing. Also, undisiurbed samples of silt and clay were taken using a 3-inch O. D. ring sampler. Our field investigations were continuously monitored by an engineer- ing geologist from our office who classified the soils encountereci and maintained a log of borings which �ire presented in Plates 1 through 4. L�boraiory test results are given in Plates 5 through 8. SIT� CONDITIONS The site is bow�ded on the west hy Rucker Avenue and on the north by 43rd Street. An alley parallels tlie east side of tlie property, and an existing building is present on the south end of tlie site, From the original ground surFace, loose silty sand fi11 ehtended from 6 �0 9 feet in deptli. Underlying the fill is about a one-foot layer ot natural to��,soil. SuUsurtace conditions at tl�e bottom ot the escavations con- sisted of in�dium dense silty� sand. The soutliwest corner of tl�e huilding area coiitai�ied about 3� to 4 feet of siity C11y Wi11CIl \Vfl5 UIICICI'I111] �)j� silty> sand to sand to tl�e depih explored. The clay layer appeared to slope clotvn- hill toward the nortbeast or could have lensed out in the southtvest corner G�OL11.H�1. SNC.