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7/8" DIAMETER HOLE <br /> ASPHALT DRILLED TO THE <br /> SUB GRADE <br /> .o ..io o '.o.;o•'o:, I4'U: o pro d. •a <br /> • � )�"'"° •••. <br /> SUB CRACK GRADE REPAIR <br /> ' SEALANT <br /> FIMEE 1___SCHEMATlc ❑F rnR 3/q" <br /> f I LE� D I-tni a PLUG "R„ <br /> • O •Y '1 r� . I ,O O O <br /> ASPHALT <br /> • 01 ', I O Q . O <br /> '0.' °'.9\',9. .Q`.e• 14' O 9.'-d'•r•��- O Y' , O ,i•• • •:•• •••i• .O• • " " <br /> ' )x SAND <br /> SUB GRADE <br /> SAND <br /> FIG IR R• SCHEMATI_ GpF RE3AIR TL'5TiN� <br /> PR❑C [lt IRF Fna rnoonr�r 'fE5T I NG DN PAV ROADWAYS <br /> TASK 1—DRILLING HOLES--DRILL A T/8" HOLE THROUGH THE ASPHALT TO THE SUB GRADE. <br /> THE HOLES ARE DRILLED 10 FEET ON CENTERS OVER THE PIPELINE USING A PNEUMATIC <br /> DRILL V41TH A 7/e" DRILL BIT, <br /> TASK 2—CORROSION TESTING---A PROBE IS INSERTED INTO EACH HOLE. A PIPE TO SOILS <br /> POTENTIAL IS MEASURED ANTI RECORDED. THE PROBE IS REMOVED. <br /> TASK 3— REPAIRING THE DRILLED HOL,E--THE HOLES ARE FIRST FILLED WITH SAND SATU5ATED <br /> WITH WATER AND TAMPED WITH A 1/2` ROD TO PROVIDE A COMPACTED SOIL BASE TO 3/q BELOW <br /> S�LIDSPLUGCINTO ,HOLE,/FLU�HH TOE THE IAHCCRSURFACEAIRTHISLMATERIAIN MATCHES THE SURROUNDING <br /> ASPHALT COLOR, LEAVING• LITTLE TRACE THAT A HOLE WAS EVER DRILLED AT THE LOCATION. <br /> APPROVED BY <br /> REV DATE DESCRIPTION <br /> GM GM WN CFIICD SUPV APVD <br /> "SCALE <br /> HOLE DRILLING -PROCEDURE FOR awc LIST <br /> ASPH��,LT DURING CORROSION SURVEYS MU aSBY SHEET I Y DF <br /> �'f C:Ir IG laf,^� /-SI�lC1L EC��IG C�IvIF�;l�! p�'FWING IJUIvIBER RL"V <br /> SAN FRAIJCISGO, CALIFORWIA 0800389 Q <br /> Iv113C)� <br /> `.� .6L2i Piri•!"r . . MIGRnFILM n <br />