Excavation Works 5.2.3
Unsuitable Unsuitable materials
5.2.3.1 Unsuitable materials shall include: (i) (i)
Runn Runnin ing g silt silt,, peat peat,, logs logs,, stum stumps ps,, root roots, s, gra grass ss and and othe otherr vege vegeta tabl ble e matt matter er,, peri perish shab able le or or toxic material, slurr or mud! or
(ii)
"rganic cla and organic silt! or
(ii)
#n material a) $hich $hich is susceptibl susceptible e to spontaneous spontaneous combustion combustion!! or b) $hich is cla having a li%uid limit exceeding &' andor a plasticit index exceeding 55! or c) $hich has a loss o* $eight greater than 2.5 on ignition.
5.2.3.2 +aterials that that are so*t or unstable merel because the the are too $et or too dr *or e**ective e**ective compaction shall not to be classi*ied as unsuitable, unless other$ise classi*ied b the .".
5.2.-
Suitable materials
5.2.-.1 uitable materials shall mean those materials materials other than the unsuitable materials de*ined in subsection 5.2.3. 5.2.-.2 /eneral *ill shall generall comprise comprise o* suitable materials materials made up o* either cohesive cohesive soil or cohesion less soil or mixture o* both. 0he classi*ication o* cohesive and cohesion less soil shall be based on oil lassi*ication stem set out in the latest + 1'5: ite nvestigation. 5.2.-.3 pecial *ill shall comprise o* material, $hich $hich $ould other$ise be classi*ied as general *ill but $hich contains durable $ellgraded natural sand and gravel or crushed roc4, other than argillaceous roc4, or durable clean crushed demolition rubble o* similar particle sie and *ree *rom an contaminants.
Filling Works .1
+aterial
.1.1
6ill materials to *orm *ormation level shall be o* suitable material obtained *rom excavation in cuttings. 7here the %uantit o* such materials is inade%uate, the ontractor shall obtain suitable materials *rom the designated borro$ pits or *rom his o$n borro$ pits $hich have been approved b the .".
.1.2
0he *ill material shall be *ree *rom roots, grass, other vegetable material, cla lump or material o* particles sie larger than 15' mm.
.1.3
and shall not be used as *ill materials at outer edges o* the emban4ment.
.2
8orro$ 9its
.2.1
0he ontractor shall be responsible *or locating borro$ pits. esignated borro$ pits sho$n on the ra$ings onl indicate to the ontractor potential areas *or b orro$. 7hether the ontractor obtains materials *rom the designated or his o$n borro$ pit, it shall be his responsibilit to ascertain the suitabilit o* the pit $ith respect to the %uantit and %ualit o* the materials, $hich shall be sub;ected to the approval o* the .".
.2.2
0he ontractor shall 4eep the borro$ pits *ree *rom $ater ponding and the excavation neat and tid. 0he contractor shall ma4e sure the side$all o* the borro$ pits is stable, protect the slope sur*ace b tur*ing and shall carr out other necessar erosion a nd environmental protection measures *ollo$ing the agreed method statement or as instructed b the .".
.2.3
0he *ollo$ing tests should be carried out *or each 1,5'' m3 o* material to be placed or more re%uent tests as re%uired b the .". : (i) #tterberg limits (ii) /radation analsis (iii) +. 1'5 ompaction 0est (2.5 4g rammer method)
