Technical Resource Guide_WEB_BEL25-D-516650 - Page 57 of 84 57 | belgard ® product installation guide | belgard.com | 877-235-4273 BELGARD ® PRODUCT INSTALLATION GUIDE | BELGARD.COM | 877-235-4273 57 Estimating Chart for Structural Backfill Using Grid with Diamond ® Series, (6") Highland Stone ® Retaining Wall Systems NO SLOPE / NO SURCHARGE