1977-12-09 Septic System Design Report

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DESCRIPTIVE TERMINOLOGY PARTICLE SIZE IDENTIFICATION 8"den over 3" OrwN Coarse Illledfum 1/2" — 1" Fine No. 4 — 1 /7' land Co" No. 4 — No. 10 Modum No. 10 — No. 40 Fine No. 40 — No. 100 Vary Flew No. 100 — No. 200 lilt No. 200 — JJ06 mm Clay loss then J306 mm RELATIVE DENSITY OF COHESION LESS SOILS very loon 0 — 4 BPF loon 5 — 10 BPF medium slam 11 — 30 BPF dense 31 — 50 BPF very dense 50+ BPF SOIL INTRUSIONS THICKNE86 let" seam lever 1" — 12" varvad alternating seams or lama of clove and silts in lake deposit MOISTURE CONTENT Dry law than 5% Moist under optimum moisture Mt over optimum moisture fttorboaring saturated send CONSISTENCY OF COHESIVE SOILS very soft 0 — 1 BPF soft 2 -- 3 BPF rather soft 4— 5 BPF msdium 6 — 8 BPF tether stiff 9 — 12 BPF stiff 13 — 16 BPF very stiff 17 — 30 8PF hard 30r 8PF RELATIVE ►ROPORTION$ with a few 0 — 10% with some 11-20% with over 20% ORGANIC CONTENT 0 — 5% non to slightly organic 6 — 10% slightly organic 11 — 25% organic 26 — 65% muck 66* Peet PLASTICITY OF SOILS WITH LESS THAN 20% CLAY non platic gritty, cannot thread slightly plastic rough to smooth, hard to thread plastic smooth to waxy, say to thread RELATIVE PROPORTIONS OF GRAVEL LABORATORY TESTS • tram 0 — 5% DD Dry Density, pcf oC Organic Content, % ' a little 6 — 15% WD yet Density, pcf S Percent of Saturation, % tame /6 — 30% MC Natural Moisture Content, % SG Specific Gravity and 31 — 5011 LL Liquid Limit, % C Cohesion ►L Plastic Limit, % 0 Angle of Internal Friction let Plasticity Index, % qu Unconfined Compressive Strength DRILLING NOTES: Standard penetration tat borings were advanced by 2%" or 3%" I.D. hollow -stem augers unless noted other- ' wise. Jetting weer was used to clean out sugar prior to sampling only where indicated on logs. Standard penetration test borings are designated by the prefix "ST" (Split Tubal. Power auger boring were advanced by 4" or 6" diameter, contin~-Ilite, solid stem augers. Soil classification and strata depths ore inforrod from disturbed samples supred to the surface and are therefore somewhat approxirrew. Power sugar borings are designated by the prefix "B". Hand probings were advanced manually with a 1 %" diernister probe and are limited to the depth from which the probe can be manually withdrawn. Hand probings we Indicated by the prefix "H" ' CLASSIFICATION: Classification on logs is made by inspection in accordance with the Unified Soils Classification System (see attached dart) wing vlsual-manual procedures unless noted otherwise. GROUND WATER: Observations were node at the times Indicted. Porosity of soil strata, seasonal weather conditions, site ' topography, etc., may cause changes in the water levels indicated on the logs. SAMPLING: All sample. we taken with the standard 2" O. D. split -tubs sampler, except where noted. TW indiesta thin - wall undisturbed sample. BPF: Numbers indicate blows per foot reeorded in standard penetration lot, also known as "N" value. The wmpler is set 6" Into undisturbed soil below the hollow -stem super. Driving rosistanca am than counted for second and third 6" increments and added to get 8PF. When they differ significantly, they are reported in the following form — 2/12 for the second and third 6" increments respectively, WH: WH indicates that sampler penetrated soil under weight of hammer and rods alone, driving not required. NOTE: All tests run in accordance with applicable ASTM standards. BMUR" ENGINEERING TESTING