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BOULDER WALL NOTES DESCRIPTION THIS WORK CONSISTS OF CONSTRUCTING BOULDER WALL STRUCTURES AT THE LOCATIONS INDICATED ON THE SITE GRADING PLAN, PREPARED BYMINNESOTA GREEN, INC., DATED 1/2/17. BOULDER WALLS ARE FORMED OF INTERLOCKING, DRY—STACKED ROCKS WITHOUT REINFORCING STEEL, MORTAR, OR CONCRETE. CONSTRUCTION REQUIREMENTS BOULDERS: BOULDERS SHALL CONSIST OF NATURAL STONE WITH VARYING HEIGHTS AND NOMINAL DEPTHS RANGING FROM 12 TO 36 INCHES (FRONT TO BACK). GENERAL: THE FOLLOWING DEFINITIONS APPLY TO BOULDER WALL CONSTRUCTION: (A) BASE ROCK: THE BASE ROCK IS THE LOWERMOST ROCK IN THE BOULDER WALL, AND BEARS DIRECTLY ON THE SOIL SUBGRADE. (B) FACING ROCK: THE FACING ROCKS COMPRISE THE BULK OF THE BOULDER WALL AND ARE STACKED ABOVE THE BASE ROCK. (C) CAP ROCK: THE CAP ROCK IS THE UPPERMOST ROCK IN THE BOULDER WALL SECTION AND "CAPS" THE BOULDER WALL. BOULDER WALL CONSTRUCTION: (A) BOULDER WALL FOUNDATION EXCAVATION: EXCAVATE A FOUNDATION TRENCH AT LEAST 12 INCHES BELOW THE GRADE AT THE BOTTOM OF THE WALL, RUNNING THE FULL LENGTH OF THE PROPOSED BOULDER WALL, OR TO THE DEPTH SHOWN ON THE PLANS. EXCAVATE THE FOUNDATION TO A MINIMUM WIDTH EQUAL TO THE SPECIFIED BASE ROCK WIDTH PLUS 12 INCHES TO INCLUDE THE AGGREGATE BEHIND THE BOULDER WALL. EXERCISE CARE DURING EXCAVATION OF THE BACK CUT. STABILITY OF TEMPORARY CUT SLOPES IS THE RESPONSIBILITY OF THE CONTRACTOR. (B) BOULDER PLACEMENT: PLACE THE FIRST COURSE OF ROCK (BASE ROCK) ON FIRM, UNYIELDING SOIL WITH FULL CONTACT BETWEEN THE ROCK AND THE SUBGRADE. EXCAVATE ANY LOOSE, SOFT OR OTHERWISE UNSUITABLE MATERIAL PRESENT AT FOUNDATION GRADE AND REPLACE WITH SUITABLE FOUNDATION FILL. COMPACT THE FOUNDATION FILL AS NEEDED. AS THE BOULDER WALL IS CONSTRUCTED, PLACE THE ROCKS SO THAT THERE ARE NO CONTINUOUS JOINTS IN EITHER THE VERTICAL OR LATERAL DIRECTION. STOCKPILE A SUFFICIENT NUMBER OF ROCKS TO PROVIDE A GOOD SELECTION FOR PLACEMENT. TO OBTAIN A BETTER FIT, PLACE ROCKS WHICH DO NOT MATCH THE SPACES OFFERED BY THE PREVIOUS COURSE IN A DIFFERENT LOCATION. AVOID PLACING ROCKS WHICH HAVE SHAPES THAT CREATE VOIDS WITH A LINEAR DIMENSION GREATER THAN 8 INCHES. EXCEPT IN ISOLATED CASES, PLACE EACH ROCK SO THAT IT BEARS ON AT LEAST TWO ROCKS BELOW IT. LOCATE AT LEAST ONE BEARING POINT A DISTANCE NO GREATER THAN 6 INCHES FROM THE AVERAGE FACE OF THE BOULDER WALL. THE ALLOWABLE TOLERANCE FOR BASE ROCK WIDTHS IS 3 INCHES; HOWEVER, DO NOT PLACE TWO OR MORE CONSECUTIVE BASE ROCKS WITH A WIDTH LESS THAN SPECIFIED ON THE PLANS. SLOPE THE TOP SURFACE OF EACH ROCK TOWARDS THE BACK OF THE BOULDER WALL AT AN INCLINATION OF AT LEAST 5 PERCENT. THE MINIMUM BOULDER WALL THICKNESS IS BASED ON MINIMUM BASE ROCK WIDTH, AS SPECIFIED ON THE PLANS, AND ALLOWABLE FACE BATTER. THE REQUIRED MINIMUM FACE BATTER IS 10 DEGREES. SECURELY PLACE FACING ROCKS SO THAT THE ROCKS ARE UNABLE TO BE MOVED WITH A PRY BAR AFTER THE BOULDER WALL IS COMPLETE. (C) VOIDS: WHERE VOIDS WITH A MINIMUM DIMENSION OF 6 INCHES OR GREATER EXIST IN THE FACE OF THE BOULDER WALL, CHINK THE VOIDS WITH SMALLER ROCK. (1) IF THERE IS NO ROCK CONTACT WITHIN THE BOULDER WALL THICKNESS, CHINK THE VOID WITH A SMALLER PIECE OF ROCK. (2) CHINKING ROCKS SHOULD NOT PROVIDE PRIMARY STRUCTURAL SUPPORT FOR THE OVERLYING ROCK. (3) CHINKING ROCKS SHOULD NOT BE ABLE TO BE MOVED OR REMOVED BY HAND AFTER BOULDER WALL IS COMPLETE. RESET LOOSE CHINKING ROCKS UNTIL SECURELY PLACED OR GROUTED IN PLACE. DO NOT ALLOW GROUT TO BE READILY VISIBLE FROM THE FACE OF THE BOULDER WALL. (D) BOULDER WALL AGGREGATE: INSTALL AGGREGATE, CONSISTING OF 3/4" TO 1 1/2" CLEAR CRUSHED AGGREGATE (NO PEA GRAVEL), BETWEEN THE BOULDER WALL AND THE BACK CUT FACE BEING SUPPORTED. THE AGGREGATE LAYER SHALL BE TO THE DIMENSIONS SHOWN ON THE PLANS, WITH A MINUMUM DEPTH OF 12 INCHES. PLACE AGGREGATE CONCURRENT WITH BOULDER WALL SO THAT AT NO TIME IS EITHER MORE THAN 12 INCHES HIGHER THAN THE OTHER. SEPARATE THE AGGREGATE FROM THE BACK OF THE BOULDERS BY A NON—WOVEN GEOTEXTILE (MIRAFI 140N OR APPROVED EQUAL). OVERLAP THE NON—WOVEN GEOTEXTILE AT LEAST 18 INCHES AT ALL SEAMS. THE TOP OF THE AGGREGATE SHOULD ALSO BE "CAPPED" WITH THE GEOTEXTILE, AS SHOWN ON THE CROSS—SECTIONS. PROPOSED BOULDER RETAINING WALLS SCALE: i i SHEET: 1.,n OF: 4 CLIENT: rVi ckery �n�ineerin� Consulting, LLC VV L MINNESOTA GREEN, INC. WILLOW HILL GUEST RESIDENCE VERIFY LINE ABOVE MEASURES I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATIONS, OR 14441 Village Woods Drive 500 WILLOW DRIVE SOUTH, ORONO, MN NONE I-INCH. IF IT DOESN'T, ADJUST REPORT WAS PR RED Y ME OR R MXPFESS ECT E-den Prairie, MN 55347 BOULDER WALL NOTES SCALE ACCORDINGLY SUPERVISION A H A DU ICE ED11ONAL hone: 952-465-8272 ENGINEER D R A S HE ST NESOTA. REV. N0: DATE: DESCRIPTION: VEC PROJECT N0: VEC 17-003 www.vicLeryeng.com DRAWN BY: RWV REVIEWED BY: VEC RONALD CKe ©2017 Vickery I—ngine g&Con501tin&LLC !DATE: I/8/17 DATE: I/8/ Rec. No.: 24065