63

PIERS.

There will be four piers numbered from east to west and an Anchorage

Pier.

The Anchorage pier will stand on the east bluff and back of the presentface of that bluff. It will contain approximately 700 cubic yards.

Pier I will be on the East side of the river, standing in nine feet of waterat high water. It will contain approximately 2 300 cubic yards.

Piers II and III will be in the river. They will each contain approxi-mately 4 400 cubic yards.

Pier IY will be near the west bank. It will contain approximately 2 800cubic yards.

Piers I, II and III will finish 12 feet thick, 35 feet long between shouldersand 47 feet long over all under the belting course.

Pier IV will finish 10 feet thick, 37 feet long between shoulders and 47feet long over all under the belting course.

The lower portions of Piers II and III will not be solid, but will con-tain three hollow spaces extending from the bottom of the masonry to highwater.

The piers shall be built in all respects to conform to the plans which willbe furnished by the Engineer.

The Anchorage Pier must be built around the anchor rods, which willextend from the bottom to the top of the masonry.

FOUNDATIONS.

The foundations will be put in by the company.

The foundation for Pier I will finish at elevation 201, or 20 feet abovelow water, and the masonry will be started after the foundation is com-pleted.

The foundation for Piers II and III will finish at elevation 141, or 40 feetbelow low water.

The contractor will be required to lay the masonry for these piers whilethe pneumatic foundations are being sunk, and to keep up with the rateof sinking, and must be prepared to lay four feet of vertical masonry perday.

The foundation of Pier IY is now finished at elevation 173, or eight feetbelow low water mark.

It is surmounted by a water-tight curb, and the contractor will begin layingmasonry on the completed foundation.

APPENDIX K ''

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SPECIFICATIONS FOR MASONRY.

STONE.

The masonry below elevation 180 and the footing courses of Pier I may beof limestone. The masonry of Pier I above the footing courses, and of PiersII, III and IV above 180 and in each case below elevation 229 shall be ofgranite with limestone backing. The masonry above elevation 229 shall be oflimestone or of granite with limestone backing, as may be directed by theEngineer.

The limestone used shall be that known as Bedford limestone from thequarries near Bedford, Indiana, unless some other limestone is expresslyaccepted by the Chief Engineer. The granite shall be a granite speciallyaccepted by the Chief Engineer. All stone of each class shall be subject to theapproval of the Engineer.

MASONRY.

The masonry shall be first class work, laid in regular courses.

Copings, starling copings included, shall have the upper beds, wash, faceand a width of six inches from face on lower beds six cut with true lines andsurfaces. Belting shall have a like proportion of the lower bed bush ham-mered and shall have a face margin draft of four inches along the lower edge.The face of the upstream starling of Piers II and III shall be fine pointed withno projection exceeding one half inch. There shall be a draft of four inches oneach side of the point of the pier on both the upstream and downstream endsof all piers below the starling coping. All other parts of the work shall have arock face with no projections exceeding three inches from the pitch line ofthe joint and no hollows back of that pitch line.

The interior faces of the walls in the hollow portion of Piers II and IIIshall have no projections exceeding six inches and no hollows exceeding twoinches from the true dimensions of the plans.

The stones shall be cut and coursed out at the quarries, every dimensionstone being marked for its place, and full course plans shall be furnished tothe Resident Engineer before shipment.

No course shall be less than 20 inches thick nor more than 36 inches thick,and no course, except the main belting and coping, shall be thicker than thecourse below it. The backing shall be of the same thickness as the dimensionwork and with beds of precisely the same character.

The bottom beds of the face stones shall never be less than 36 inches ineither direction. Headers shall be at least six feet deep measuring from pitchline of the face, and stretchers shall measure at least five feet long in the wall.

Every header shall retain a width of at least 24 inches at the full specifieddepth from the face. Every stretcher shall retain a length of at least four feet36 inches back from the face. The beds of the principal pieces of backing ineach course shall average at least eight square feet. The bottom bed shallalways be the full size of the stone. The top bed shall nowhere be more thansix inches less than the bottom bed. There shall be not less than three normore than four headers between the shoulders on each side in each course. Inthe hollow portions of Piers II and III there shall be at least one stone ineach course bonding three feet each way between the cross walls and the facewalls of the pier.

The upper and lower beds shall be parallell and dressed closely to trueplanes with no projections above those planes.

The face edges shall be pitched to true lines. The cutting of joints for adistance of 12 inches from the face shall be the same as that of the beds.

Joints shall be at right angles with face and beds unless otherwise shownon special plans. The hollows due to plugging must not exceed eight per centof the surface of the bottom bed nor fifteen per cent of the surface of the topbed of any stone. No plug hole to be more than nine inches across nor morethan one inch deep. Hollows due to plugging will not be allowed in limestone.

Joints shall be broken at least 15 inches on the face.

The stones for the coping shall be cut according to special plans to be fur-nished by the Engineer; all the beds shall be the full size of the stones, andspecial pains shall be taken with the bearings on the belting course below' thecoping.

All stones shall be laid in full mortar beds. They shall be lowered onthe bed of mortar and be brought to a bearing with a maul, no spawls beingallowed. Thin mortar joints will not be insisted on, but the joints shall beproperly cleaned on the face to a depth of one inch and a half and pointedin mild weather, the pointing to be driven in with a calking iron. The open-ings in the backing shall never exceed a maximum of six inches or an averageof two inches between adjacent stones; these openings shall be filled withsmall stones thoroughly bedded and well packed in mortar.

The face stones of every seventh course shall be dowelled into those ofthe course below with round dowels of one and one eighth inch iron, extendingsix inches into each course; the dowels shall be placed from eight to twmlveinches back from the face and eight inches on each side of every joint. Thestones of the upper course shall be drilled through before setting, after whichthe drill hole shall be extended six inches into the lower course; a smallquantity of mortar shall then be put into the hole, the dowel dropped inand driven home and the hole filled with mortar and thoroughly rammed.