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Building a Pit <br />wi~'h Concrete Blocks <br /> <br />How Much Gravel, How Many' <br /> <br />Bloc~? <br /> <br />wid,., p~t ~, ~ 14. ~me~ 4 lime~ 4. For each <br />~,quart, (Oot of bo~(om area. you <br />two 50-pound bags. TO de~crmme ho~ <br />much ~ravel you n¢ed for the wall fill- <br /> <br />-lhe~ multiply the ~rcumf('renCe by <br /> <br />needed for the p~t /oo[~n6, work out <br />the footing's tuner ¢,rcum(erence In <br />inches and divide this figure by <br />To figu,'e boy,, m~ny you no0d ~0~ <br />walls,, work au[ the ctrcumference of <br /> <br />by (he number of cour~e~-lhe <br />depth in mche~,, divided by e~h~ <br /> <br /> <br />