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SURFACE REPAIR MINIMUM WIDTH OUTER PIPE DIAMETER (OD) + 6-FT PIPE OD 2-FT CUT BACK NATURAL GROUND/UNDISTURBED SUBBASE MATERIAL 5-FT MAX WITHOUT SHORING/BRACING FINISH GRADE EXISTING SURFACE EXISTING BASE REMOVE IF UNSTABLE PER 301.3.11.G TRENCH SIDEWALL BACK SLOPE (MIN 1:1) PER OSHA OR USE SUITABLE SHORING (PORTABLE TRENCH SHIELD/BOX) TRENCH WIDTH OD + 2-FT TRENCH FOUNDATION STABILIZATION PER SECTION 304 IF SUBGRADE UNSTABLE 6-INCH MIN PIPE ZONE USE TYPE I BEDDING PER SECTION 305 TRENCH BACKFILL AND COMPACTION PER SECTION 306 SUBGRADE PREPARATION PER 306 AND 307.3.4 PROVIDE UNIFORM BEARING AREA LOCATING WIRE AT PIPE CROWN PER SECTION 401.2.10 AND 401.3.2.O MIN 42-INCH COVER LOCATING/WARNING/MARKING TAPE/RIBBON PER 505.2.7.B AND 505.3.4.C WARNING TAPE 18-IN TO 24-IN 1-FT MIN EACH SIDE EXTEND SAWCUT OUTSIDE VEHICULAR WHEEL PATH 2 1 PROVIDE MAX DEPTH STABILIZATION 18-INCH. USE 3-IN MINUS DRAIN ROCK BACKFILL (801.2.2) IF GROUNDWATER WITHIN 1-FT OF STABILIZATION PER SECTION 501.3.2.C AND 601.3.2.B 3 ASPHALT TACK COAT PER SECTION 806 CITY OF JEROME PUBLIC WORKS Richard Wuori, PE, Director 152 East Avenue A Jerome ID 83338 http://www.ci.jerome.id.us TYPICAL TRENCH SD-301 STANDARD DRAWING NO. DATE 21 SEPT 2017 GENERAL NOTES A INSPECTION REQUIRED BEFORE BACKFILLING B 6" MIN BEDDING MATERIAL (3/8" REJECT SAND) C TRENCH DIMENSIONS PER ISPWC 301.3.12 D ALLOW ENGINEER TWO WORKING DAYS TO MEASURE PIPE LOCATION PER SECTION 401.3.8.B E INSPECTION REQUIRED BEFORE BACKFILLING SHEET KEYNOTES 1 HMA THICKNESS MIN. 3-IN OR MATCH EXIST WHICHEVER GREATER. 2 AGGREGATE BASE MIN. 6-IN OR MATCH EXIST WHICHEVER GREATER. 3 SUBBASE MAY BE REQUIRED X ISPWC SPECIFICATION REFERENCE DIV 300 TRENCHING SEC 307 STREET CUTS AND SURFACE REPAIRS HMA HOT-MIX ASPHALT OSHA OCCUPATIONAL SAFETY AND HEALTH - SLOPING AND BENCHING (1926 Subpart P App B) ISPWC IDAHO STANDARDS FOR PUBLIC WORKS CONSTRUCTION A TYPICAL TRENCH DETAIL Relative Scale 1"=1.5' Absolute Scale 1:18 0' 0.75' 1.5' \\jeromefs01\DeptEngineering\Shared\_CAD_STANDARDS\ver2018\Section300-Trenching\SD-301-TypicalTrench-C3D2018.dwg