320.1 Preliminary Geotechnical Report (PGR) - Revision history

Hoskir: /* 320.1.6 Preliminary Geotechnical Report (PGR) */ updated per RR3917

2024-08-13T13:42:45Z

320.1.6 Preliminary Geotechnical Report (PGR): updated per RR3917

← Older revision		Revision as of 08:42, 13 August 2024
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	==320.1.6 Preliminary Geotechnical Report (PGR)==		==320.1.6 Preliminary Geotechnical Report (PGR)==
	The report shall be in letter form as provided in the PGR standard paragraphs document. Since investigations differ in scope and complexity, the standard paragraphs document is not meant to be a rigid format but as a guide to ensure most topics have been covered. The report should be clear, concise, and in outline form if long or detailed. The report shall contain the following information, as applicable:		The report shall be in letter form as provided in the [https://epg.modot.org/forms/general_files/CM/PGR_StandardParagraphs_ReportTemplate.docx PGR standard paragraphs document]. Since investigations differ in scope and complexity, the standard paragraphs document is not meant to be a rigid format but as a guide to ensure most topics have been covered. The report should be clear, concise, and in outline form if long or detailed. The report shall contain the following information, as applicable:
	:'''(a)''' Brief description of the project including clearly described location and station limits.		:'''(a)''' Brief description of the project including clearly described location and station limits.

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	:'''(e)''' [[127.22 Off-Site Borrow, Spoil, and Staging Areas\|Contractor furnished borrow]]. If the contractor is to furnish borrow, specify those permissible soil types which will provide a suitable subgrade and which are both readily available and compatible with slope recommendations. Avoid specifying a soil type which may have only one practical source (and owner). Sample and report one or more possible borrow sites for each acceptable soil type where the owner expresses an interest in furnishing material. (This does not require a commitment on the part of the owner or the department and the contractor is free to use any other source provided defined criteria are met.)		:'''(e)''' [[127.22 Off-Site Borrow, Spoil, and Staging Areas\|Contractor furnished borrow]]. If the contractor is to furnish borrow, specify those permissible soil types which will provide a suitable subgrade and which are both readily available and compatible with slope recommendations. Avoid specifying a soil type which may have only one practical source (and owner). Sample and report one or more possible borrow sites for each acceptable soil type where the owner expresses an interest in furnishing material. (This does not require a commitment on the part of the owner or the department and the contractor is free to use any other source provided defined criteria are met.)

	:'''(f)''' Steepest slopes allowed for long term stability of cuts and fills including bridge spill slopes. EPG Section 321.1.1 Slope Inclination for Preliminary Geotechnical Report shall be used as a guide in preparing recommendations. Slopes should be no steeper than those shown in Table 321.1 (Guide for Selection of Slope Inclination for Routine Design) and justification should be furnished for flatter or steeper slope recommendations.		:'''(f)''' Steepest slopes allowed for long term stability of cuts and fills including bridge spill slopes. [[321.1_Design_of_Earth_Slopes#321.1.1_Slope_Inclination_for_Preliminary_Geotechnical_Report\|EPG Section 321.1.1 Slope Inclination for Preliminary Geotechnical Report]] shall be used as a guide in preparing recommendations. Slopes should be no steeper than those shown in Table 321.1 (Guide for Selection of Slope Inclination for Routine Design) and justification should be furnished for flatter or steeper slope recommendations.

	:'''(g)''' Notation of the absence or presence of possible critical foundation areas and reference to special investigations in progress or completed by the Geotechnical Section.		:'''(g)''' Notation of the absence or presence of possible critical foundation areas and reference to special investigations in progress or completed by the Geotechnical Section.

Hoskir: updated per RR3917

2024-08-09T17:23:17Z

updated per RR3917

Show changes

Hoskir: Reverted edits by Hoskir (talk) to last revision by Smithk

2024-08-08T18:38:37Z

Reverted edits by Hoskir (talk) to last revision by Smithk

← Older revision		Revision as of 13:38, 8 August 2024
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	\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]		\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]
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	\|[[media:~~LabSummaryTemplate_M41_revised_10~~-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]		\|[[media:320.1_M-41.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]
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	\|[[#320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41\|Example for Form M-41, Summary for Preliminary Geotechnical Report]]		\|[[#320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41\|Example for Form M-41, Summary for Preliminary Geotechnical Report]]

Hoskir: Hoskir moved page 320.1 Preliminary Geotechnical Report to 320.1 Preliminary Geotechnical Report (PGR): renamed per RR3917

2024-08-08T17:33:13Z

Hoskir moved page 320.1 Preliminary Geotechnical Report to 320.1 Preliminary Geotechnical Report (PGR): renamed per RR3917

← Older revision	Revision as of 12:33, 8 August 2024
(No difference)

Hoskir at 19:25, 7 October 2022

2022-10-07T19:25:16Z

← Older revision		Revision as of 14:25, 7 October 2022
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	\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]		\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]
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	\|[[media:~~320.1_M~~-41.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]		\|[[media:LabSummaryTemplate_M41_revised_10-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]
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	\|[[#320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41\|Example for Form M-41, Summary for Preliminary Geotechnical Report]]		\|[[#320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41\|Example for Form M-41, Summary for Preliminary Geotechnical Report]]

Smithk: /* 320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41 */

2022-03-03T18:40:34Z

320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41

← Older revision		Revision as of 13:40, 3 March 2022
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	===320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41===		===320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41===
	[[image:320.1.4.2_M-41_Example.jpg\|center\|~~700px~~\|thumb]]		[[image:320.1.4.2_M-41_Example.jpg\|center\|850px\|thumb]]

	===320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42===		===320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42===

Smithk: Per CM, provided updated Summary for Preliminary Geotechnical Report (Form M-41) and example of M-41

2022-03-03T18:38:54Z

Per CM, provided updated Summary for Preliminary Geotechnical Report (Form M-41) and example of M-41

← Older revision		Revision as of 13:38, 3 March 2022
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	This guidance establishes procedures for sampling, laboratory testing and reporting for preliminary geotechnical investigations.		This guidance establishes procedures for sampling, laboratory testing and reporting for preliminary geotechnical investigations.

	{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="~~160px~~" align="right"		{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="260px" align="right"
	\|-style="background:#f5f5f5"		\|-style="background:#f5f5f5"
	\|'''Figures'''		\|'''Figures'''
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	\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]		\|[[media:320.1 Insoluble Residue Test lab report example.pdf\|Insoluble Residue Test lab report example]]
	\|-		\|-
	\|[[#320.1.4.2 Summary for Preliminary Geotechnical Report - Form M-41\|Summary for Preliminary Geotechnical Report ~~- Form M-41~~]]		\|[[media:320.1_M-41.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]
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			\|[[#320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41\|Example for Form M-41, Summary for Preliminary Geotechnical Report]]
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	\|[[#320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42\|Subsurface Logs for Preliminary Geotechnical Report - Form M-42]]		\|[[#320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42\|Subsurface Logs for Preliminary Geotechnical Report - Form M-42]]
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	[[Image:320.1 Example Preliminary Geotechnical Report3.gif\|center\|700px\|thumb]]		[[Image:320.1 Example Preliminary Geotechnical Report3.gif\|center\|700px\|thumb]]

	===320.1.4.2 Summary for Preliminary Geotechnical Report - Form M-41===		===320.1.4.2 Example for the Summary for Preliminary Geotechnical Report - Form M-41===
	[[image:320.1 ~~Form M~~-41.~~gif~~\|center\|700px\|thumb]]		[[image:320.1.4.2_M-41_Example.jpg\|center\|700px\|thumb]]

	===320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42===		===320.1.4.3 Subsurface Logs for Preliminary Geotechnical Report - Form M-42===

Smithk: Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

2021-10-01T13:42:49Z

Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

← Older revision		Revision as of 08:42, 1 October 2021
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	===320.1.2.3 Sample Identification===		===320.1.2.3 Sample Identification===
	Sample Identification record shall be entered in ~~SiteManager~~ and shall accompany all samples shipped to the Laboratory.		Sample Identification record shall be entered in AASHTOWARE Project (AWP) and shall accompany all samples shipped to the Laboratory.

	===320.1.2.4 Quarantine Areas===		===320.1.2.4 Quarantine Areas===
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	===320.1.5.4 Report===		===320.1.5.4 Report===
	'''All test results, except fertility and rock type identification''' are reported through ~~SiteManager~~, with distribution to:		'''All test results, except fertility and rock type identification''' are reported through AWP, with distribution to:

	:District Construction and Materials Engineer		:District Construction and Materials Engineer

	'''Fertility test results''' are reported on the ~~SiteManager~~ Lab Report, with distribution as follows:		'''Fertility test results''' are reported on the AWP Lab Report, with distribution as follows:

	:State Maintenance Engineer		:State Maintenance Engineer

Smithk: updated links

2020-07-10T12:55:11Z

updated links

← Older revision		Revision as of 07:55, 10 July 2020
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	====320.1.2.2.1 Soil Classification Samples====		====320.1.2.2.1 Soil Classification Samples====
	Samples shall be obtained, for classification by ASTM D 2487 and AASHTO M145 (except that group index will be calculated by procedures of M 145-49) and for determination of natural moisture content, at intervals of 5 ft. (1.5 m) or less in at least one hole from each cut with a significant amount of soil. Except in extraordinary circumstances, samples should be obtained from multiple (3 or more) representative locations and from each cut where depth of soil is 10 ft. (3 m) or more. [[~~:Category:135 The Section 106 Process#135~~.3 Borrow and ~~Excess Material~~ Areas\|Borrow areas]] other than roadway cuts shall be similarly sampled in detail to define the range of properties of the material to be borrowed. Classification samples shall be packaged in plastic bags, tied, and double packaged in heavy Kraft paper bags. Bags shall be securely packaged in heavy cardboard boxes for shipment. Alternately, samples may be packaged and shipped in small canvas sacks with plastic liners. Moisture samples shall be sealed in airtight containers for moisture determination in the district Operations Laboratory.		Samples shall be obtained, for classification by ASTM D 2487 and AASHTO M145 (except that group index will be calculated by procedures of M 145-49) and for determination of natural moisture content, at intervals of 5 ft. (1.5 m) or less in at least one hole from each cut with a significant amount of soil. Except in extraordinary circumstances, samples should be obtained from multiple (3 or more) representative locations and from each cut where depth of soil is 10 ft. (3 m) or more. [[127.22 Off-Site Borrow, Spoil, and Staging Areas\|Borrow areas]] other than roadway cuts shall be similarly sampled in detail to define the range of properties of the material to be borrowed. Classification samples shall be packaged in plastic bags, tied, and double packaged in heavy Kraft paper bags. Bags shall be securely packaged in heavy cardboard boxes for shipment. Alternately, samples may be packaged and shipped in small canvas sacks with plastic liners. Moisture samples shall be sealed in airtight containers for moisture determination in the district Operations Laboratory.

	*Note: It is intended that sufficient samples shall be obtained, without sampling bias, so that test results will be reasonably indicative of the dispersion of properties of the soils to be encountered in grading. The number of locations sampled should depend upon the size of the job but three is considered the minimum acceptable for a small job. The number of samples at each location in turn should depend upon stratification and upon the depth of material to be excavated and/or left in place as subgrade.		*Note: It is intended that sufficient samples shall be obtained, without sampling bias, so that test results will be reasonably indicative of the dispersion of properties of the soils to be encountered in grading. The number of locations sampled should depend upon the size of the job but three is considered the minimum acceptable for a small job. The number of samples at each location in turn should depend upon stratification and upon the depth of material to be excavated and/or left in place as subgrade.
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	:'''(d)''' Definition, limits, and recommended disposition of unsuitable materials.		:'''(d)''' Definition, limits, and recommended disposition of unsuitable materials.

	:'''(e)''' [[~~:Category:135 The Section 106 Process#135~~.3 Borrow and ~~Excess Material~~ Areas\|Contractor furnished borrow]]. If the contractor is to furnish borrow, specify those permissible soil types which will provide a suitable subgrade and which are both readily available and compatible with slope recommendations. Avoid specifying a soil type which may have only one practical source (and owner). Sample and report one or more possible borrow sites for each acceptable soil type where the owner expresses an interest in furnishing material. (This does not require a commitment on the part of the owner or the department and the contractor is free to use any other source provided defined criteria are met.)		:'''(e)''' [[127.22 Off-Site Borrow, Spoil, and Staging Areas\|Contractor furnished borrow]]. If the contractor is to furnish borrow, specify those permissible soil types which will provide a suitable subgrade and which are both readily available and compatible with slope recommendations. Avoid specifying a soil type which may have only one practical source (and owner). Sample and report one or more possible borrow sites for each acceptable soil type where the owner expresses an interest in furnishing material. (This does not require a commitment on the part of the owner or the department and the contractor is free to use any other source provided defined criteria are met.)

	:'''(f)''' Minimum slopes necessary for long term stability of cuts and fills including bridge spill slopes. The [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]] shall be used as a guide in preparing recommendations. Slopes should be no steeper than those shown in the [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]] and justification should be furnished for flatter or steeper slope recommendations. (Flattening or steepening of slopes for reasons unrelated to geotechnical considerations is not the responsibility of the geologist.) Placement of select, not necessarily granular, materials may be practical at bridge ends, particularly at grade crossings, to permit shortening of structures by steepening of spill slopes (in accordance with criteria of the [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]]). This is normally only practical with assured sources of select borrow which are readily distinguishable from less desirable materials.		:'''(f)''' Minimum slopes necessary for long term stability of cuts and fills including bridge spill slopes. The [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]] shall be used as a guide in preparing recommendations. Slopes should be no steeper than those shown in the [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]] and justification should be furnished for flatter or steeper slope recommendations. (Flattening or steepening of slopes for reasons unrelated to geotechnical considerations is not the responsibility of the geologist.) Placement of select, not necessarily granular, materials may be practical at bridge ends, particularly at grade crossings, to permit shortening of structures by steepening of spill slopes (in accordance with criteria of the [[#320.1.4.5 Guide for Slope Recommendations\|Guide for Slope Recommendations]]). This is normally only practical with assured sources of select borrow which are readily distinguishable from less desirable materials.

EPGsysop at 19:37, 7 April 2017

2017-04-07T19:37:54Z

← Older revision		Revision as of 14:37, 7 April 2017
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	Samples shall be obtained, for classification by ASTM D 2487 and AASHTO M145 (except that group index will be calculated by procedures of M 145-49) and for determination of natural moisture content, at intervals of 5 ft. (1.5 m) or less in at least one hole from each cut with a significant amount of soil. Except in extraordinary circumstances, samples should be obtained from multiple (3 or more) representative locations and from each cut where depth of soil is 10 ft. (3 m) or more. [[:Category:135 The Section 106 Process#135.3 Borrow and Excess Material Areas\|Borrow areas]] other than roadway cuts shall be similarly sampled in detail to define the range of properties of the material to be borrowed. Classification samples shall be packaged in plastic bags, tied, and double packaged in heavy Kraft paper bags. Bags shall be securely packaged in heavy cardboard boxes for shipment. Alternately, samples may be packaged and shipped in small canvas sacks with plastic liners. Moisture samples shall be sealed in airtight containers for moisture determination in the district Operations Laboratory.		Samples shall be obtained, for classification by ASTM D 2487 and AASHTO M145 (except that group index will be calculated by procedures of M 145-49) and for determination of natural moisture content, at intervals of 5 ft. (1.5 m) or less in at least one hole from each cut with a significant amount of soil. Except in extraordinary circumstances, samples should be obtained from multiple (3 or more) representative locations and from each cut where depth of soil is 10 ft. (3 m) or more. [[:Category:135 The Section 106 Process#135.3 Borrow and Excess Material Areas\|Borrow areas]] other than roadway cuts shall be similarly sampled in detail to define the range of properties of the material to be borrowed. Classification samples shall be packaged in plastic bags, tied, and double packaged in heavy Kraft paper bags. Bags shall be securely packaged in heavy cardboard boxes for shipment. Alternately, samples may be packaged and shipped in small canvas sacks with plastic liners. Moisture samples shall be sealed in airtight containers for moisture determination in the district Operations Laboratory.

	*Note: It is intended that sufficient samples shall be obtained, without sampling bias, ~~such~~ that test results will be reasonably indicative of the dispersion of properties of the soils to be encountered in grading. The number of locations sampled should depend upon the size of the job but three is considered the minimum acceptable for a small job. The number of samples at each location in turn should depend upon stratification and upon the depth of material to be excavated and/or left in place as subgrade.		*Note: It is intended that sufficient samples shall be obtained, without sampling bias, so that test results will be reasonably indicative of the dispersion of properties of the soils to be encountered in grading. The number of locations sampled should depend upon the size of the job but three is considered the minimum acceptable for a small job. The number of samples at each location in turn should depend upon stratification and upon the depth of material to be excavated and/or left in place as subgrade.

	====320.1.2.2.2 Stabilization Samples====		====320.1.2.2.2 Stabilization Samples====
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	:In instances of widespread or non-localized seepage along areas of side hill fill, selective placement of blankets of available pervious material (normally rock from Class C excavation) should be considered to intercept and daylight the seepage to the outside toe of slope. Well-defined, localized seeps and spring flows, however, may be more economically handled with pipe-aggregate underdrains, particularly where project sources of rock or other pervious materials are limited or non-existent. See also paragraph (i) concerning placement of select granular materials for pavement drainage purposes.		:In instances of widespread or non-localized seepage along areas of side hill fill, selective placement of blankets of available pervious material (normally rock from Class C excavation) should be considered to intercept and daylight the seepage to the outside toe of slope. Well-defined, localized seeps and spring flows, however, may be more economically handled with pipe-aggregate underdrains, particularly where project sources of rock or other pervious materials are limited or non-existent. See also paragraph (i) concerning placement of select granular materials for pavement drainage purposes.

	:'''(i)''' All new pavement is to be constructed on two feet of select rock fill when that material is available in suitable quantities on the project site. This includes Light, Medium, and Heavy Duty pavements of either rigid or flexible design. The preliminary geotechnical report should include a statement concerning whether the quantity of select granular fill available on the job site is adequate, of appropriate quality, and located ~~such~~ that it could reasonably be placed as the top two feet (600 mm) of subgrade material. When the quantity of rock on a job is less than is necessary, but would be a significant portion of that needed, a general estimate of that proportion should also be given in the preliminary geotechnical report. Rock fill from sources other than the roadway balance should also be considered if within reasonable proximity to the job.		:'''(i)''' All new pavement is to be constructed on two feet of select rock fill when that material is available in suitable quantities on the project site. This includes Light, Medium, and Heavy Duty pavements of either rigid or flexible design. The preliminary geotechnical report should include a statement concerning whether the quantity of select granular fill available on the job site is adequate, of appropriate quality, and located so that it could reasonably be placed as the top two feet (600 mm) of subgrade material. When the quantity of rock on a job is less than is necessary, but would be a significant portion of that needed, a general estimate of that proportion should also be given in the preliminary geotechnical report. Rock fill from sources other than the roadway balance should also be considered if within reasonable proximity to the job.

	:Note: This information is important in the early stages of project development because the subgrade material to be used will effect the type of pavement selected, the thickness of a flexible pavement, the type of drainage required, and final elevations.		:Note: This information is important in the early stages of project development because the subgrade material to be used will effect the type of pavement selected, the thickness of a flexible pavement, the type of drainage required, and final elevations.