Arizona republican., 1915-12-07

specifications for such work. Very truly yours.
 w. $. GEARHART.
 State Engineer"
 The city of Houston has used con- siderable asphaltic concrete largely as a top dressing for their roads. and their mayor writes as follows:
 Dear MT. Heard:
 am in receipt of your letter of the 18th instant regarding asphaltic concrete pavement which we con- struct under a modified Topeka specification.
 We ordinarily pay 90 cents to S1.00 per square yard for inch surface of this pavement where the TeXacO As phaltic Cements are used, and about SilO where the Bermudez cement is used.
 Our observation is that this pave ment is very suitable pavement for residential streets. but if the street has much heavy traffic it is liable to wave more than a, bitulithic pave ment, but it is believed that this can i be avoided by the use of Bermudez asphaltic cement.
 A copy of specificati atiOns is en- , closed herewith.
 Yours very truly. BEN CAMPBELL. Mayor" The following letter from the city engineer of Fort Worth, Tex. which has much pavement under Topeka specifications. is interesting: Fort Worth. Tex, Oct 27, 1915. Mir. Dwight B. Heard, Phoenix, Arizona.
 Dear Sir:
 Replying to your inquiry of the goth instant. addressed to Mayor Tyra, regarding pavements laid in this city under the Topeka specifica- tions beg to advise that we have but recently laid this kind of pave ment.
 It is similar in all respects to BituIithic. with the exception that certain sizes of stone provided for in the Bitulithic specifications may not be used under the Topeka spec ifica tions. and that the use of such stone in @, pavement is likely to lead to the city's being enjoined as our city was on Lipscomb street in this city until royalties to Warren Bros. were paid
 The first pavement of this type (asphaltic concrete. Topeka specifi . cltions) was laid on Terrell avenue in 1913 IL has not been subjected to much traffic. but is in perfect condition. Other streets of this type we have laid are North Houston street. and Central avenue. from Central 10 Twentieth. North Ft. Worth. the work on these streets being done in 1915.
 All of this particular kind of pave ] ment has been down such a short : while that I would rot wish to com i pare it with Bitulithic that has been
 down six or eight years in our city and which is still giving satisfac- ! ton. do not mind however. and ! am glad of the opportunity to say 1 that the work we have laid under ! the Topeka specifications has, i throughout the period it has been : down. stood up very well-and equal i Iy as well as any bitulithic we have i had occasion to lay, in the same ! length os time.
 1 We seem to have been particularly l fortunate in the fact that all of our i pavemcnts seem to be giving eXcep- 1 tiOnal service.
 Yours very truly. (Signed) F. J. VON ZUBEN,
 City Engineer R. II. Mccormick. city engineer of | Detroit under date of Nov. 18th, | writes as follows:
 ! We have a pavement which IS l known as asphaltic concrete and ! which costs a little more than the i ordinary reinforced concrete. This makes a smooth and almost noiseleSs ! pavement.
 He further states that during 1915 ! the city of Detroit has laid S1,23O.0OO worth of this pavement at an aver age price of $2.63 per square yard l It is very evident that if Topeka pavement could be laid without legal ] complications in the city of Phoenix, d pavement very similar to bitulithic would be obtained at probable saw i ing Of 25 cents per square yard, and 1t is also evident that the use of a inch pavement of asphaltic concrete ! or Warrenite laid on a dirt base | would make a most excellent pave ment for the residential districts of i Phoenix, and it should be possible to | lay such a pavement with a fair profit to the contractor, at about | $1.25 per square yard. In laying
 this pavement. as in fact in the lay | ing of all pavements. particular at | tention should be given to the care l fuI preparation of the sub-srade and provision made for thorough drain age of the area paved.
 IL is apparently, however, not nec-
 essary to go to such tremendous ex- pense as was involved in the First
 avenue drainage. MT. w. & Hum
 bert. an engineer of many years eN- l perierce and a member of the advis-
 ory highway commission of this
 county. yesterday made the following ! statement relative to this question ol drainage:
 Before the paving of the city i streets is again taken up. the city | authorities should see to it that the tax payers are not further assessed for an extension of the absolutely
 unnecessary and costly storm sewer proposed and initiated by the last
 city council.
 In order to make use of this sewer. the so-called 'saw-toothT curn and gutter is installed as has bee
 oone on First avenue.
 This form of construction is en- tirely needless in this locality and proper drainage may be easily ob- tained without the costly storm
 sewer. ny suitable grades being pro-
 vided on the street profile. If our city was subject to eXtrelns
 cold and heavy snow, tnere might