b'Anticipated Service Load RangePAS Soil Anchor Plate - F.S. = 1.576Earth Contact ProductsService Load Range x 1,000 lb.100% Sand5Clayey Sand4 SandyClay100%Clay3PAS - Service Load Range - F.S.=1.5 .22 2.5 3 3.5 4Std Penetration Test - "N" blows/ft.Graph reading examples: The soil at the site When in doubt, the most conservative resultwasobservedandestimatedtobe softslightly can be obtained from assuming that the soilsandyclayatadepthofsixfeetbelowgrade composition is mostly clay.where the Earth Anchor Plates will be installed. TheinformationforthisexamplehasbeenAn approximate value for Standard Penetration entered on the graph on next page.One can seeTest was estimated at N = 2.5 bpf. that the graph predicts a range of Service LoadLooking at the sample graph next page, the top capacitiesbaseduponthefieldsoildatagraph line is soil consisting of 100% sand and estimates.the lower graph line 100% clay soil.The graph Inthisexample,theestimated Service Loadalsoincorporates a minimumFactorofSafety (T SL ) thatmightbe expectedisbetween6,000(FS)of1.5inthecalculationstoarriveatan and6,800pounds when anECPEarthPlateestimated Service (working) Load (T SL ) for the Anchor PAL Kit is installed. Notice that theEarth Plate Anchor. example used SPT, N = 2.5 bpf.The dashed line represents soil that consists of Oneshouldalsoconsidercheckingcapacitiesequal parts sand and clay.Moving upward from withinsoftersoil.Ifthesoilatthesitewasthe dashed line means that the observed soil at lower,actuallyN=2bpf,theestimatedthe site contains more sand than clay, similarly Service Load is 4,700 to 5,500 pounds as shownmoving downward means that the soil contains at the left edge of the graph.more clay and less sand. This is why it is very Thisexamplealsoillustratesthefactthattheimportant to inspect and accurately estimate the load estimates are very dependent upon accuratesoil composition at the job site. soil information from the job site.If available, soil borings from nearby jobs could If one is unsure of the soil, a very conservativebe referenced to assist the installer to determine option would be to consider using a lower valuesoil data at the proposed job site. for SPT, N, and read horizontally from closerto the 100% clay line on the graph.ECP Helical Plate Anchors Technical Service Manual2021 Earth Contact Products, L.L.C.2021-09 Chapter 2 - Page 43 All rights reserved'