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, <br /> Soil Probes <br /> To verify and further examine soil conditions, four hand auger soil probes were made at the site. The <br /> locations of the soil probes are plotted on the above map, prepared from the Gronberg survey exhibit <br /> showing the site boundaries, ground slope and the proposed structure location. It was noted that the <br /> soil boundary between the two Lester soil units is generally consistent with the "bluff line" shown on the <br /> survey. <br /> Test probes 1 and 3 we�e put down within the area of the old driveway above the bluff line. Test <br /> probes 2 and 4 were located within the steeper slope below the bluff line. The soil logs were recorded <br /> as follows. <br /> Test probe 1 Test probe 3 <br /> Surtace 979 feet Surface 981 feet <br /> , 0 to 1.5 feet—black loam (OL) 0 to 1 foot—black loam (OL) <br /> 1.5 to 3 feet—gray brown loam (CL) 1 to 3 feet—buff colored loam (CL) <br /> Test probe 2 Test probe 4 <br /> Surface 976 feet SurFace 977 feet <br /> 0 to 2.5 feet—black loam (OL) 0 to 1.5 feet- black loam (OL) <br /> 2.5 to 3 feet—gray brown loam (CL) 1.5 to 3 feet—buff colored loam (CL) <br /> The designations: CL and OL are based upon the Unified soil classification. CL refers to inorganic <br /> clays of low to medium plasticity, gravelly clays, sandy clays, silty clays, and at this site: lean clavs. OL <br /> refers to organic silts and here: orqanic siltv clavs of low plasticity. Using the AASHO classification <br /> system, the Lester soils are generally A-4 or A-6. <br /> Findings and Assessment: <br /> The observed soils were found to be consistent with � ''�`°_� <br /> Lester loam. • The black loam at the surface is slightly `"`'�V <br /> 1 ar' <br /> organic silty clay topsoil. _ At each probe, the topsoil ' <br /> . �t A 1� <br /> showed a gradational color change to the underlying soil � :� , ' „� <br /> materials, indicating these soils have been little disturbed �� <br /> 11 <br /> except by say, wheel rutting along the old roadway. <br /> There was no evidence that imported soil materials such � <br /> � as sand or gravel were used to improve the old driveway <br /> surface. There was also no evidence of any erosion on - <br /> or near the driveway bed. The fact that the driveway bed <br /> has shown no signs of erosion in over a century adds R � <br /> support to the conclusion of this analysis that the soils at <br /> this site have sufficient stability to allow construction of a <br /> home at the site indicated on the Gronberg and � X•r :. r. - .: .� <br /> Associates survey. ��:.. �f = �- - <br /> � �'M,_y �y��I � <br /> 'ir+�^ w� <br /> Below the topsoil, the lean clay become increasingly stiff ..� � - r ' <br /> with depth and can be expected to provide adequate soil � � . <br /> R <br /> bearing capacity for single family residential dwelling t., <br /> footings, designed for clay. ' �` <br /> �� <br /> The photograph on the right shows the old driveway <br /> looking westerly. The proposed house site will be just <br /> beyond the bent over tree. This photograph is included to illustrate the extent of tree cover. The <br /> frequency of trees shown on the test hole location map above the old driveway is generally repeated <br />