Code of Maine Rules › 02 - DEPARTMENT OF PROFESSIONAL AND FINANCIAL REGULATION › 385 - MANUFACTURED HOUSING BOARD › Chapter 890 - MANUFACTURED HOME INSTALLATION STANDARDS › Subchapter C - SITE PREPARATION › Section 385-890-C-II - Soil Classifications and Bearing Capacity

Current through 2024-29, July 17, 2024
The soil classification and bearing capacity of the soil
					 must be determined before the foundation is constructed and anchored.The soil
					 classification and bearing capacity must be determined by one or more of the
					 following methods, unless the soil bearing capacity is established as permitted
					 in Paragraph F of this section:
A.
				  Soil tests that are in accordance with generally accepted engineering practice;
				  or
B. Soil records of the applicable
				  LAHJ; or
C. If the soil class or
				  bearing capacity cannot be determined by test or soil records, but its type can
				  be identified, the soil classification, allowable pressures, and torque values
				  shown in the table to this section may be used.
D. A pocket penetrometer; or
E. In lieu of determining the soil bearing
				  capacity by use of the methods shown in the table, an allowable pressure of
				  1,500 psf may be used, unless the site-specific information requires the use of
				  lower values based on soil classification and type.
F. If the soil appears to be composed of
				  peat, organic clays or uncompacted fill, or appears to have unusual conditions,
				  a registered professional geologist, registered professional engineer, or
				  registered architect must determine the soil classification and maximum
				  allowable soil bearing capacity.
Table to Subchapter C, Section II - Soil
					 Classifications and Bearing Capacity
ASTM D 2487-00 or D 2488-00, (incorporated by
					 reference)
Soil classification
Soil description
Allowable soil bearing pressure
								(psf)1
Blow count ASTM D 1586-99
Torque probe3
								value4(inch-pounds)
Classification number
1 ................
..................................
Rock or hard pan
								.......................................
4000+ .......................
2................
GW, GP, SW, SP, GM, SM.
Sandy gravel and gravel; very than dense and/or
								cemented sands; course gravel/ cobbles; preloaded silts, clays and coral.
2000 .........................
40+
More than 550.
3................
GC, SC, ML, CL ......
Sand; silty sand; clayey sand; silty gravel; medium
								dense course sands; sandy gravel; and very stiff silt, sand clays.
1500 .........................
24-39
351-550.
4A..............
CG, MH2.................
Loose to medium dense sands; firm to stiff clays
								and silts; alluvial fills.
1000 .........................
18-23
276-350.
4B..............
CH,
								MH2..................
Loose sands; firm clays; alluvial fills
								.........
1000 .........................
12-17
175-275.
5 ................
OL, OH, PT .............
Uncompacted fill; peat; organic clays
								.......
Refer to Subchapter C Section II(F)
0-11
Less than 175.
Notes to Table
1. The values provided in this table have not
				  been adjusted for overburden pressure, embedment depth, water table height, or
				  settlement problems.
2. For Soils
				  classified as CH or MH, without either torque probe values or blow count test
				  results, selected anchors must be rated for a 4B soil.
3. The torque test probe is a device for
				  measuring the torque value of soils to assist in evaluating the holding
				  capacity of the soil in which the ground anchor is placed.The shaft must be of
				  suitable length for the full depth of the ground anchor.
4. The torque value is a measure of the load
				  resistance provided by the soil when subject to the turning or twisting force
				  of the probe.