320.1 Preliminary Geotechnical Report (PGR) - Revision history

Hoskir at 16:33, 7 April 2026

2026-04-07T16:33:12Z

← Older revision		Revision as of 11:33, 7 April 2026
Line 3:		Line 3:
	<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f8f9fa; padding: 0.3em; border: 1px solid #a2a9b1; text-align:left;">		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f8f9fa; padding: 0.3em; border: 1px solid #a2a9b1; text-align:left;">
	'''<u><center>Figures</center></u>'''		'''<u><center>Figures</center></u>'''
	* [https://epg.modot.org/forms/CM/Central_Lab_Sample_Sizes.xlsx Central Lab Sample Sizes QRG]]		* [https://epg.modot.org/forms/CM/Central_Lab_Sample_Sizes.xlsx Central Lab Sample Sizes QRG]
	* [[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]]
	* [[media:LabSummaryTemplate_M41_revised_10-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]		* [[media:LabSummaryTemplate_M41_revised_10-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]

Hoskir: added sample size QRG per RR4205

2026-04-07T16:32:53Z

added sample size QRG per RR4205

← Older revision		Revision as of 11:32, 7 April 2026
Line 3:		Line 3:
	<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f8f9fa; padding: 0.3em; border: 1px solid #a2a9b1; text-align:left;">		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f8f9fa; padding: 0.3em; border: 1px solid #a2a9b1; text-align:left;">
	'''<u><center>Figures</center></u>'''		'''<u><center>Figures</center></u>'''
			* [https://epg.modot.org/forms/CM/Central_Lab_Sample_Sizes.xlsx Central Lab Sample Sizes QRG]]
	* [[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]]
	* [[media:LabSummaryTemplate_M41_revised_10-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]		* [[media:LabSummaryTemplate_M41_revised_10-22.docx\|Summary for Preliminary Geotechnical Report (Form M-41)]]

Hoskir: /* 320.1.1 Procedure */ updated per RR4141

2025-12-19T17:35:29Z

320.1.1 Procedure: updated per RR4141

@@ Line 11: / Line 11: @@
 ==320.1.1 Procedure==
-The preliminary geotechnical report originates in, and is the responsibility of, the District. Cut classification, preliminary sounding for structures, and the locating of critical foundation areas are considered part of the preliminary geotechnical report. The preliminary geotechnical report shall be conducted essentially in accordance with the AASHTO Manual on Subsurface Investigations, AASHTO R13, “Conducting Geotechnical Subsurface Investigations”, and the Geology and Soils Manual, 1962 Edition, Chapter III, Missouri State Highway Commission. These references are guides and are not intended to preclude the use of ingenuity and judgment.
+The Preliminary Geotechnical report (PGR) originates in, and is the responsibility of the District. A PGR is likely necessary on any project that requires grading such as general fill placement, cut of any existing slopes, realignment of a roadway, addition of a shoulder/lane, MSE Wall, box culvert, bridge replacement, new bridge, etc. If you are unsure or just do not know, please contact your District Geologist. If your District does not have a District Geologist, please contact the Geotechnical Director for guidance. For bridge structures, please note the timeline of when a PGR should be completed in relation to a Bridge Survey ([[751.1_Preliminary_Design|EPG 751.1.1.5]] New Regular Bridge Design Schedule). Design has also created Project Schedule tool in Power BI that includes a template timeline for geotechnical investigations.
 Description of soils shall be in accordance with [https://epg.modot.org/forms/general_files/CM/Field_Guide_FIELD_VERSION.pdf MoDOT’s soil and rock classification guide]. The Stratigraphic Succession in Missouri by Thomas L. Thompson and subsequent publications of the Missouri DNR, Division of Geology and Land Survey shall be used as guides to stratigraphic identification. Rock quality designation (RQD) and recovery shall be measured wherever applicable in logging rock cores.

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
Line 45:		Line 45:

	==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.

Line 56:		Line 56:
	:'''(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
Line 9:		Line 9:
	\|[[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]]
	\|-		\|-
	\|[[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)]]
	\|-		\|-
	\|[[#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
Line 9:		Line 9:
	\|[[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]]
	\|-		\|-
	\|[[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)]]
	\|-		\|-
	\|[[#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
Line 154:		Line 154:

	===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
Line 1:		Line 1:
	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'''
Line 9:		Line 9:
	\|[[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)]]
			\|-
			\|[[#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]]
	\|-		\|-
	\|[[#320.1.4.3 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]]
Line 151:		Line 153:
	[[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===