CONSTRUCTION NOTES 269 



Turf walks. Turf walks are always laid on fine soil without any ferti- 

 lizer, so the only materials required are sod and topsoil if the existing soil 

 will not serve. Two experienced men qan cut, roll, pile and load sod at the 

 rate of about nine square yards per man per hour, or .11 man hour per 

 square yard. In the case of less experienced men this will amount to .15 

 man hour per square yard. Hauling by team will cost one team hour per 

 hundred square yards per mile haul. Laying sod where accuracy is required 

 may require as high as one man hour per square yard but ordinarily should 

 not run on straight turf walks over one-half man hour per square yard. 

 Maintenance in the form of sprinkling will be required in dry weather as 

 often as once a day and ordinarily two or three sprinklings will be necessary 

 in any event. A man with 100 feet of three-fourths-inch hose can sprinkle 

 from 475 to 500 square yards an hour. 



Woodland trails. The average labor cost of four woodland trails about 

 three feet wide, exclusive of the cost of logs for steps, was $.049 per linear 

 foot with labor $.22 per hour. A fair average would be from .2 to .25 labor 

 hour per linear foot. 



Gravel or macadam walk. To construct a walk made with a three-inch 

 cinder base on a rough foundation (of stones picked up on the job) and a 

 two-inch trap rock dust surface layer (including some drainage) required 

 .16 labor hour per square foot. 



SPECIFICATIONS FOR TARVIA WALKS 1 



Subgrade. Grade walk to elevation three inches below finished grade 

 as shown on walk profile, and roll thoroughly with light roller. 



Foundation. Upon subgrade spread crushed limestone one-fourth to 

 one inch size (small amount of screenings allowable) and roll dry until 

 thoroughly keyed or compacted. Surface of foundation to be brought to 

 elevation one inch below finished grade line. 



Wearing surface. Upon foundation spread one inch of mixture of stone, 

 sand and tar prepared as follows: crushed trap rock, one-fourth to one- 

 half inch, four cubic feet; coarse washed sand, two cubic feet; tarvia k. p., 

 three gallons. Mixed cold in batch concrete mixer. This mixture spread 

 and raked to a depth sufficient to meet contour of finished grade, when 

 thoroughly rolled with 500 hand roller. Cover surface with coarse sand 

 sufficient to leave surplus after interstices in stone are filled and rolled 

 again with light roller. 



Crowns. Walk crowned one-fourth inch per foot of width each side 

 of center lines. 



1 Park Department, Minneapolis, Minnesota. 



