319 76TH PL SW 2016-01-01 MF Import

SERS Public Safetu q-1-1 Communication Tower ( Si Report No. 704.05224-1 December 26, 2000 Page 2 3.0 Scope of Work The purpose of our evaluation was to assess the subsurface soil conditions at the site in order to provide appropriate recommendations for site preparation and foundation design. In general, our evaluation included the following authorized scope of work items 3.1 Subsurface Exploration In order to ascertain soil conditions at the site, one Standard Penetration Test (SPT) soil boring (B- 1) was made using our CME75 truck-mounted, hollow-stem, power auger with an automatic hammer. The soil boring location was reviewed with Mr. Ottosen and Mr. Diamond prior to drilling and is shown on the attached Borng Location Plan in the Appendix. The boring log is also found in the Appendix. It should be noted that PSI was not able ace any soil borings within the proposed tower location due to lack of access by our drill rig. rhe site had not been cleared of trees and dense brush at the time of our site exploration. The Standard Penetration Test is performed by driving a 2-inch, O.D., split-spoon sampler into the undisturbed formation located at the bottom of the advanced auger with repeated blows of a 140- pound, pin-guided, automatic hammer falling a vertical distance of 30 inches, The number of blows required to drive the samp'^r one-fool is a measure of the soil consistency (cohesive soils) and density(non-cohesive soils). The automatic hammer used on our drill rig generally produces lower standard penetration test values than those obtained using a traditional safety hammer. Studies by PSI hake generally indicated that penetration resistances may vary by a factor of 1.5 to 2 between the two methods. We have considered this drilling and testing methodology in our evaluation of soil strength and compressibility. Soil samples were generally taken in the boring at 2.5-foot intervals for the first 10 feet, and then at 5-foot intervals to the termination depth of the boring. Samples were identified in the field, placed in sealed containers, and transported to the laboratory for further classification and testing Undisturbed samples will be retained for 60 days after Submittal of this report and then discarded, unless notified otherwise in writing. 3.2 Field& Laboratory Testing Selected samples of the subsurface soils encountered were returned to our laboratory for further evaluation to aid in classification of the materials, and to help assess their strength and compressibility characteristics. The laboratory evaluation consisted of visual and textural (� l�J