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MEMOByfaxon1y C
From CGE/ME
Ref.( ) In GCME 2/El17SE 國 A/C574
Tel. No. 27625198
Fax. No. 27140245
To CGE/SM ，LandsD
M伽.:Mr.CK Wong
Your Ref._(_)_m
dated Fax. No. 21160822
Date 21.2.2014 Total page 2+encl.
Agreement No. CE 47/2009(GE)Enhanced Maintenance Programme - Upgradin g!Improvement Works to
Lands Department Slopes in the Northern RegionsInvestigation ，Design and Construction
Feature Nos. 7SE-AlC547 (Sub-Division No.2)Lot 493 in DD185 above 160-161 Ha Wo Che Villaee. Shatin
(Revised Draft Design Report)
I refer to the letter from your Consultants ，Fugro (Hong Kong) Limited，ref.0911211D/06694 dated 29.11.2013 submitting the captioned report and subsequent discussionswith Mr. Kelvin Shea ofFugro.
2. In response to my comment，Mr.Shea submitted supplementary information and revisedpages of report/drawings via his email on 21.2.2014 (attached herewith). There is no adversegeotechnical comment on the revised draft design report.
3. You are suggested to inform the owner of Lot No.493 inDD185 (i.e. the Hong KongBuddhist Sangha College) before commencement of the slope upgrading works and explain thereason to them for not processing Joint Action for the private portion ofthe feature.
General4. Please promptly report any significant signs of distress and/or notable landslides during theconstruction works to the GEO.
Site Supervision5. In accordance with the requirements given in Appendix 7.47 of the PAH，please provideCategory I & III qualified site supervision ofthe works as specified in Attachment No. 1.
6. Please provide the GEO with a copy of the master programme for the works contract andthe curriculum vitae of the nominated supervision personnel prior to the commencement of thecontract.
Not ，伊cation to GEO7. Please notify the GEO of the commencement date of slope upgrading works. You arereminded to keep records of soil nailing works on site for inspection by the GEO.
SoilNails8. Please submit to the GEO a report on the results of the site 仕ials with a clear statement onthe buildability of the soil nails and whether special methods of construction need to be adopted(and if so the details) prior to commencement of construction of the working nails.
9. Please be reminded that the Category III personnel is required to prepare and certify the keyrecords on supervision of soil nailing works given in Attachment No.2. The records should besubmitted to the GEO for comment. The extent of supervision required at different stages of soilnailing works as indicated in Attachment No.3 should be provided by Categories I and IIIpersonnel accordingly.
10. Please be advised that there 缸'e benefits for you to install electrically conducting wires inthe soil nails. These could facilitate checking of the length of the soil nails installed，if required，using the Time Domain Ref1ectometry (TDR) measurement 記st.The GEO may also carry outTDR tests during site audits. Please refer to the latest version ofthe CEDD Standard Drawing No.C210611 (http://www.cedd.gov.hk) for the typical details of a soil nail with a conducting wire.
的r伊cation of Design Assumptions11. Please be reminded to carry out verification of the geological model assumed in the designduring construction and include the findings (as a part of the as-built records) in the slopemaintenance manual.If any major geotechnical design assumptions ，such as the ground conditionsand groundwater levels，as verified/determined on site are found invalid，design amendments withsupporting documents should be submitted to the GEO for comment as soon as possible.
12. Please be reminded that，upon completion ofthe groundwater monitoring (at least one wetseason)，a review of the design groundwater levels should be submitted to the GEO for comment.
Slope Registration13. Your attention is drawn to the requirements on registration and updating of the Catalogueof Slopes as stipulated in WBTC No. 912000，in particular on the requirementsof provision ofslope information to the GEO under paragraphs 8 to 10 ofthe circular. You are advised to do thisbefore applying for the Checking Certificate for the slopes/retaining walls.
GEO Checking Certificate14. When applying for a Checking Certificate for geotechnical features newly formed，upgraded，substantially modified or assessed as up to the required geotechnical standards，pleaserefer to the requirements or guidelines stipulated in ETWB TC(W)No. 2012004，Section 4.6.9 ofChapter 4 of the PAH and DPN 137. The term 、geotechnical features' include man-made slopefeatures (cut and fill slopes and retaining walls)，NS and ND features. Itis important that all theparties concerned are aware of their respective responsibilities in certifying the design andcompletion and stability assessment refeηed to in the Checking Certificate. For geotechnicalfeatures involving design or alternative design to be carried out by the Contractor ，you shouldagree with the GEO the form of Checking Certificate to be issued prior to tendering. Please notethat Checking Certificate will not be issued if any of the requiredinformatio n/documentatio n/records mentioned in this memo or other acceptance memos is/areoutstanding.
位朋閥割 leAL ENGINEER那o OFFICEMAINLAND EAST DMSION
Z 4 FEB 2014共計γ
DESPATCHED (Jacky C W NG)for Chief Geotechnical EngineerlMainland East
Geotechnical Engineering OfficeCivil Engineering and Development Department
Encl.
c.c. Fugro (Hong Kong) Limited (attn: Mr.Y C Koo，Fax no. 2895 2379)
馴服竟 ME 245059
Page 1 of 1
CE47 2009 - Feature No. 7SE-AJC574 回 Response to GEO's Comments on RevisedDesign [email protected]:[email protected]/2014 11 :52Cc:[email protected] DetailsFrom: "Shea，Kelvin [FHK]" <[email protected]>
To: <[email protected]>
Cc: "Tsang ，Alan [FHK]" <atsang@ 臼gro.com. hk>
EDMS No.:12EVP Doc. Src.:
1 Attachment
時表7SE-AC574 (207) - Response to GEO's Verbal Comment on 17.1.14.pdf
Dear Jacky Ng，
I refer to your verbal comments on the revised design repo性 for the captioned feature. Please find attachedour response for yQur review and agreemen t.Ifyou have further question ，please give me a call at 28945768.
Thanks for your attention.
Regards ，Fugro (Hong Kοng) LimitedKelvin SheaSenior EngineerTelephone: +852 2894 5768 I Fax: +852 2895 2379E-mail: k:[email protected] I Website: www.fuQro.comAddress: 7/F ，Guardian House ，32 Oi Kwan Road ，Wanchai ，Hong Kong
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7/F.. GuardianHouse，32 Oi KwanRoad，Wanch函， HongKong
FUGRO (HONG KONG) LIMITEDTel
E-叮lail
CONSULTING ENGINEERS2577-90232895-2379 12895-3499
Job IRete陪 nee IDrawingreference ICalculationsbyAgreement No. CE47/2009 091121.207 \ SXFeature No. 7SE- AlC574Lot 493 in DD 185 above 160-16\SubjectHa Wo Che Village ，Shatin Stability Analysis on Existing Feature
Checked by IPageSHS I E 3
Date
19/2/2014
3.3 Assumptions on Groundwater Conditions
1) The wetting band descends vertically under the influence of gravity after the cessation of rain.
2) Diffusion is ignored after heavy and prolonged rainfal l.
3) 訂閱 relatioship between rainfall on unprotected slopes，infiltration and the depth ofthe wetting frontis given by (Lumb，1975):
h= ，~一-n(Sf - So)where h depth of wetting 企ont
k coe在icient 'Of permeabilitydurati 'On 'Of rainfall
n porositySo = initial degree 'Of saturati 'OnSf = final degree of saturation
4) Assumed permeability 'OfCDG = 1 x 10-0(mls)
Ca Iculation using Wetting Band Approach (Lumb 1975)
咱圖且
βuwd.
-u，3
徊。
A岫
T
r
、，且
ρuvGP
Initial degree 'Of saturation ，So
So VwVv
Where Vv. water v'OlumeVv void volume自 moistur 官 c'Ontel=
Vw = m (l-n )Gs V n por'OsityGs specific gravit)=
19.50 % (average m'Oisture c'Ontent'Obtained 企'Om lab. test)
。.4 (assum吋)2.65 (assumed)
Figure 4.5，GeotechnicalManual forSlopesVv=nV V total volume
So且(l-n 盟主
n
0.1950 ( 1 - 0.4 ) 2.650.4
0.78
After prol 'Onged rainfall， Sf (fully saturated)
Sr So = 0.23
Fr'Om Fig. 4.5'OfGe 'Otechnical Manual f'Or Sl'Op郎，
As a result，a design gr'Oundwater table atone-third 'Of the sl'Ope height ( approximately3.6 m) is ad'Opted t'Om'Odel the effect 'Ofhighest gr'Oundwater table f'Or a lO-year returenperiod rainfall and on the c'Onservative side. A perched water table at O.5m heightabove COLLILD laver base is assumed in the sl'Ope stability analvsis as well.
Figure 4.5，Ge'OtechnicalManual f'OrSl'Opes
凹-C574-App 帥 dix E-S旭bili砂孔 nalysisonExi 血ngF 目lUI電.STABILITY ANALYSIS EXS Printed Time: 14:05
DESIGN REPORT (Type D Feature)Upgrading Works Using Conventional Design Approach
Feature No.: 7SE-AlC574 I Item No.: 207Lot493 in DD 句的 above 呵。-161 Ha Wo CheVillage ，Shatin
9.0 Geology:
The Hong Kong Geological Survey，1:20，000 scale geological map，Series No. HGM20，Sheet 7 - Shatin，indicates that the feature is underlain by colluvium adjoining to coarse-grained granite. No adverse geologicalfeatures ，which may affect the stability ofthis feature，were indicated on the above geological survey map. Apa吋-print of the geological map is shown in Figure 4
Based on the results of recent GI，field observations and A門， the geology of the feature is mainly composedof the following materials:
(i) COLULD with thickness varying from 0.8 m to 1.0 m;(ii) The COLULD layer is underlain by completely to highly decomposed granite(C/HDG) materials;(iii) Underneath C!HDG ，moderately to slightly decomposed granite (M/SDG) was encountered.
The inferred geological models at Sections 1-1 and 2-2 are presented in Figures 5 to 6 respectively. Thematerials encountered in the recent GI fieldworks are summarised as follows:
COLULD (Colluvium! Landslide Debris)Firm，brown，sand clayey silt with some angular to subangular gravel occasional cobble and boulder sizedrock fragments.
C!HDGVery· weak to weak，yellowish brown spa投ed black and white，completely to highly decomposed coarsegrained granite.
10.0 Groundwater Conditions:
Design groundwater level was determined based on measurements of water levels of standpipe taken afterinstallation from 2 January 2013 and 9 January 2013 and by means of the wetting approach. Thegroundwater monitoring records taken during the foresaid period indicated that no groundwater levels wererecorded at drillhole C574-DH1 ，trial pits C574-TP1 ，C574-TP2 ，C574-TP4 and C574-TP6.
Taking into account of the potential rise。f the groundwater |evel igJhRSFnt omeavy 阻in哩!l and an lijIris 先assessment of the po悔ntial rise of the groundwater table using th'( Wetting'自nd瓦斯已均有 design IIIιjgroundwater table at one-third of the slope height was adopted to m。面前面繭的研制吾有逗留個ndwater |il 的
table for a 10-year return period rainfall. In addition ，a O.5m司 high perched water table above the base of theCOLURemaining Landslide Debris is also assumed to cater for possible formation of transient groundwatertable during heavy rainfall. The details of the estimation of design groundwater table by wetting approach areincluded in Appendix E. The design groundwater table at Sections 1-1 and 2-2 are shown in Figures 5 to 6respectively.
Agreement No. CE4712009 (G旬EMP - VII Works to Lands D Slopes 的 the Northern Regions
Page 4 of 8
Feature No.Location:
T:able2:Summarv of theGroundwater MonitorinaRecords
7SE- AlC574Lot 4B3 in DO 185 泌的 e 160-161 Ha Wo Che Villa 伊，Shatin
Page1/1
Standpipe/Piezometer C574-DH1 C574-TP1 PI:'字'Tn~ C57牛TP4 C574-TP6Depth of Standpip e/Piezometer Tip (m): 18.00 2.30 3ι00 3.00 1.00Standpipe/PiezometerTip Level (mPD) 帶 29.10 30.誼。 28.40
-1131D4l2，I3Y0013Date lI'1stalled 1/112013 111/2013 111/2013Initial Groundwater (mf>D) 。ry 。ry 。ryGround Level (mPD): 30.10 32.9 日 30.30 35.30
c。一。rdinates: (Eastiog) 837705.70 837722.11 837715.66 637720.93 837710.82(No 吋叫 n9) 827769 .4口 827768.15 827769.52 827763;61 827762.95
Depth of Highest Buck Eltf~om Ground (m): 1.00 0.30 。‘50 D3.hS5O0D0.50
伸MiD。eaa開包dt錯的陷z動adl區d關型e勵e型dusd給h鎧Um型t 計umG 蜘祕倆
1坑。。 2.30 3.00 1.0017 5 6 2
1.00 0.50nlfoges2o日12
0.5日 0.50立自11112012 29月2日2012 2911212012 2911212012
Standpipe I Piezome 悔 r C574-DH1 C574-TP1 C574-TP2 C574·TP4 C574 個W6
Date m.B.G.L mPD m.B.G.L mPD m.B.G.L mPD m.B.G.l mPD m.B.G.t mPD
2/1/2013 (w) 。ry . Dry . Dry Dry - Dry(B) Dry - Dry Dry 。ry - 。ry
3/112013 (w) 。ry 。ry 。ry Dry Dry(B) Dry Dry 。ry " Dry ZE411/2013
輯:。ry ' Dry Dry "
Dry Dry 。ry .5/1/2013
Dry Dry 。ry。可 -- Dry Dry 。ry Dry
61112013司E Dry 。ry Dry 。ry
(B) Dry Dry - 。ry Dry Dry
7/1/2013 (w) 。ry國﹒ 。ry
旦EED旦BErv已tDry 。ry
(B) Dry Dry 。ry Dry
81112013(w) 。ry 。ry Dry Dry(Bl Dry 。ry - - Dry - 。ry
9/1/2013 (w) Dry 。ry . Dry Dry - Dry(B) Dry 。ry - Dry 年- Dry 。ry
國副
2/2/2013 (w) 。ry Dry 戶 Dry Dry 。Drfyy -(B) 。ry Dry Dry Dry - -
161:<日'2013 (w) Dry 。'ry - Dry - Dry . Dry(B) Dry 。'ry Dry Dry . Dry
2均，f2013 (w) 。ry - Dry 自 Dry - 。ry . Dry(B) 。ry Dry . Dry - 。可 Dry -
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3013/2 日13 Dry 。ry 何 Dry - Dry - DryDry 。ry - Dry - Dry " Dry -
1314/2 日13 Dry Dry Dry 咀 Dry ' Dry。- Dry - Dry Dry - 。rv -
27/412013 Dry 。ry 。ry Dry- Dry - Dry . Dry - Dry
11/5/2013(的 Dry Dry Dry " Dry(8) Drv . 。ry - Dry Dry
2515/2013 (w) Dry Dry Dry 。ry -(Bl J)ry w Dry . 間y . Dry 章」一一一-一
BI612013 (w) Dry " 。ry 。ry . Dry w 尸-一叮叮叮(8) Dry Dry Dry 且已 Dry -(w) 。ry Dry ‘-
E。DfSrYy已Dry
L;........;.一-由221612013
(B) Dry 。ry Dry . Dry
617位的 3 (的 。ry Dry Dry Dry(B) Dry Dry :幸言 Dry 。ry "
20佇您的$ (w) Dry - Dry " Dry " Dry 自
(B) Dry Dry 。ry 。ry "
3/812013 (w) 。ry 。ry Dry Dry Dry .(B) Dry ' Dry Dry 前 。'ry 司戶 Dry -
17/8/2013 (w) 。ry Dry 。ry 。ry - Dry(B) Dry Dry 。ry . Dry 。ry "
31/8/2013 (w) Dry Dry . 。ry - 。ry - Dry "
(B) Dry Dry . Dry 司開
一一旦旦D旦旦ry" DrY 司
141912口13 (w) 。ry 。ry Dry 。ry -(Bl Dry Dry Dry 。ry
2819/2013 (w) Dry 。ry Dry 叫“ Dry Dry w
(B) Dry " Dry Dry . Dry - Dry "
12110/2013 (w) Dry 。ry Dry Dry Dry "
(B) Dry 。ry Dry ' 。ry Dry -Remarks: 以f)WaterLeνel
(8) Highest Bucket with Entrapped Water
卡，自值。
巴孝通CONSULTING ENGINEERS
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TelFaxE-mail
FUGRO (HONG KONG) LIMITED71且， GuardianHouse，32 OiKwanRoad，Wanchai，HongKong
PageF 3
Checkedby
SHS
Date
JobAgreement No. CE47/2009Feature No. 7SE-AlC574Lot 493 in DO 185 above 160-1611SubjectHa Wo Che Village，Shatin Soil Nail Design for Feature No 7SE-AlC574
Calculationsby
SXDrawingreferenceReference
091121.207
19/02/14
3. Soil Nail Desian Assumptions
3.1豆umm童白
For arrangement and extent of soil nai峙， refer to Drawing Nos. EMP2010/207f01 andEMP/207/02.
e assumed and applied to the slope surface to
3.20esian Assumptions
Stabilizingforces actinincrease the F.O.S. of tn
3.2.1
High yield bars for soil nails shall comply with BS4449 accordance with BS EN ISO1461:1999
3.2.2
A reduction of Omm radius as sacrificial thickness for steel corrosion is allowed.
For Sections 1斗 and 2-2Diameter 25mmLength of bar = 7m
Grade 30 cement grout with water/cement ratio not exceeding 0.45 is used.3.2.3
作1付1150Diameter of drillhole =3.2.4
The following soil parameters are selected in the soil nail analysis:
19 kN/m;$19 kN/m;$
y =y =
= 32°= 37。
中，
中，COLLfLD:c'= 1 kPaC/HDG :c'= 3 kPa
3.2.5
Soil nails are to be installed at 20° downwards. which are installed at a horizontalspacing of 1.5 m.
3.2.6
The e仔'ect of shear and bending of nails across the criti伺 Islip su巾ce is considered asinsignificant and is ignored in the design.
3.2.8
Printed Time: 13:56
The soil nails are assumed to be fully bonded in soil.
1.42.02.0
〉一〉一〉一
3.2.10 The required factors of safety are:(i) Overall Stability(ii) Bond failure between grout & steel(iii) Pull Out failure between grout & soil
11~C574 -Appendix F-Soil Nail D目，gn ∞nve肘ional-D 間ign Assumptions
3.2.9
Featu 時 No.: 7SE-A1C574 litem No.: 207
Lot 493 in DD 185 above 160-161 Ha Wo CheVillage ，Shatin
DESIGN REPORT (Type D Feature)Upgrading Works Using Conventional Design Approach
心帥叫 t⋯issued to the own智心 No. 493 in 00185 (i.e. the Hong Kong Buddhist S克扣College above the feature) on 28 August 2009 (OH049/01/NT(II}) to remind the owner to carry out necessarypreventive maintenance works on the private po成ion of Feature No. 7SE-A!C574 (Sub-division 1). The lotowner expressed that he p陪 ferred to carry out the slope upgrading/improvement works under a joint action II 可 11"with the government.Ho~ever ，no other record regarding the processing ，agreement or confirm~tion of the I( 占當的法
)n of the slope upgrading works between the private lot owner and the government departmenbe found when the detailed study and design of the slope upgrading works for the.subject slope started in late2012. Under the circumstance ，in view of the works contract of this Agreement will expire soon，having
z ∞nsulted the Lands Oepa付me肘， it was decided to upgrade the government po吋ion of the feature under the I Jl I curre叫 Agreemen t.Copies of relevant correspondences found in Slope File No. SMS/SLP/1/7SE-A!C574 are If
J 1 presented in Appendix H. 1\
The latest Engineer Inspection (凹陷port for maintenance for the feature was prepared by C M Wong &Associates Ltd in May 2011. The Routine Maintenance Inspection (RMI) to the feature was carried in May2012. Based on the EI and RMI records，neither signs of distress nor signs of seepage were observed at thefeature in the past inspection. Routine Maintenance Works (RMW) including removalof debris and witheredvegetation on slope surface and installation of slope registration sign plate were recommended in last RMI(2012).
GEO Incident No. 2008/06/0160 recorded a landslide occurred on the feature on 7 June 2008. The failurescale was about 75 m3 and the possible contributing cause of the failure was infiltration. Immediate advices，such as fencing off area in danger;evacuating buildings ，squatter structures and village houses; divertingsurface runoff from reaching failure area; covering failure scar with tarpaulin and checking land status andsquatter structure status were recommended. All the immediate advices had been implemented. Theapproximate location of the landslip is shown in Figure 2. A copy of the GEO incident repo吋 is provided inAppendix H.
According to the EI repo此， there are no recorded utilities located on or in the vicinity ofthe feature.
According to GEO Circular 悔，旬， the feature is eligible for selection for action under the preventivemaintenance programme based on the following:
(i) According to the Slope Information System of the GEO，this feature is classified as C1;(ii) No available information indicates that this feature has been assessed or upgraded to current
standards;(iii) The feature may a何ect existing cottages at its toe，where parts or extensions of the a仟'ected
structures are located on the licensed land at the toe of the feature. (i.e. GLL T12525).
5.0 Aerial Photograph Interpretation:
An aerial photograph interpretation (API) was carried out to establish the development history and past hydro-geological ∞nditions of the feature. A copy of the API report is included in Appendix C.
The API indicates that the feature was formed in 2008 probably after the landslide occurred at the feature inJune 2008. Aerial photographs taken before 2008 show that the feature location was covered by densevegetation and boundary of the subject feature could not be identified. The aerial photograph taken in 2010has clearly shown that the whole extent of the su句ect feature was covered by hard surface. No th悟到。fboulder fall is evident from the photographs. No prevailing drainage line is identified in the vicinity of the
Agreement No. CE4712009 (GE)EMP - UII Works to Lands D Slopes 的 the Northern Regions
Page 2 of 8
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Attachment No. 1/~")，ef.: 2IE 117SE-A/C57 4有
Location: Lot 493 in DD185 above 160-161 Ha Wo Che Vi1la!!e. Shatin
Qualified Supervision for Geotechnical Worksin Government Proiects
Cate!!orv (I} Under Section 4.3of Chapter 7 of the Project Administration Handbook ，the slope upgrading worksshall be supervised by a geotechnical engineer who is familiar with the geotechnical content of the submission ，preferably from the Depar阻lent/Consultant which prepared the geotechnical design. A suitable person is a RegisteredProfessional Engineer (Geotechnical) or equivalent.He shall carry out inspections at the critical stages of the slopeupgrading works，including the relevant stages of soil nailing works as stipulated in Attachment No.3.
He shall carry out inspections at least Qnce Der week，or more frequently if necessary. He shall inspect all criticalitems of works and ensure timely follow-up actions are taken to ensure adequate quality of the works and no adverseimpact on life and prope向人 He shall check that the design assumptions are valid and that the works are being carriedout as specified in the accepted design，and shall continue to advise the Engineer or his Representative of actionsneeded. His inspection records and reports shall be submitted to GEO Qnce Der month forcomment and kept on siteand made available for inspection. Typical format and contents of the report is shown in Appendix A.Prior to thecommencement of the works，the name and professional details of the engineer who is to carry out these inspectionsshall be submitted to GEO for comment.
Cate!!orv 旺In Under Section 4.3of Chapter 7 of the Project Administration Handbook，a sufficient number ofsuitably experienced and qualified person(s) independent 企om the Contractor shall be resident 亟且亟盟金 on site (i.e.during the site working hours) duringthe carrying out ofthe Slope upgrading works to check that the works are beingcarried out as specified. The suitable person(s) shall have 2 years experience in geotechnical works. He shallliaiseclosely with the Category I and/or II supervision personnel throughout the works. His inspection records shall be kepton site and made available for inspection by GEO. For soil nailing works，the extent of supervision required fordifferent construction stages is given in Attachment No.3. He shall carry out site inspections ，and prepare and'certi 砂the key records on supervision of soil nailing works (see Attachment No.2). The Project Departmen t/Consultant shallformally submit these records to GEO upon completion of installation of soil nails. Prior to the commencement of theworks，the name(s) and professional/experience details of the person(s) proposed shall be submitted to GEO forcomment.
GCDIST 95 (Apr 2012) P.1
Attachment No. 1AooendixA
T'voical Contents of the Re£!:ular Reoorts submitted bv Cate f!orv IIII Personnel
Typical contents of the reports should include the following as appropriate. A submission to GEO is required shouldthere be any significant changes in the design after the design review.
1. Pro!!ress ofthe Works
(a) R的ords (e.g. drawings，photographs and geological sections) on progress of the works，includingretaining structures，grouting，foundations ，shoring，anchors，soil nails，excavation and basementstructures. Among others，the depths and extent of excavation ，layers of struts installed and levels oflowest struts installed should be given.
2. Results of Monitorin!! durin!! Construction
(a) Description of the monitoring system，including the "designed alert levels" of settlements，movements ，deflections and groundwater levels，and details of all surrounding sensitive structures and utilities.
(b) Plans and photographs showing the locations of all monitoring points (e.g. including settlement points，movement markers，piezometers ，inclinometel 丸 load cells and strain gauges).
(c) Results of all monitoring points with graphs and tables showing the variation of the results with time.
(d) Discussions and interpretations of the results of all monitoring work，including proposals for any changesof measuring devices and for investigation of observed anomalies.
3. Site Observations
(a) Reports of initial defect survey (including photographs) of all surrounding structures and utilities (onlyrequired in the first report).
(b) Reports of any significant movements or signs of distress observed including signs of differentialsettlements，cracks on pavements ，cracks on adjacent buildings and structures，damage to water mains orother utilities (including photographs).
(c) Reports of any excessive displacements and collapses (including photographs) ，survey plans/sections ofaffected ar它的，time & date ofthe incident ，probable reasons and any proposed remedial actions.
(d) Reports of any significant deviations from approved plans observed，such as missing members ordeficiencies in the shoring system，over-excavation prior to installation ofthe struts or lagging.
(e) Reports of any significant deviations of geology and groundwater conditions from the design assumptions(e.g. unexpected seepage or weathering profile).
(f)Reports of any critical activities in the vicinity ofthe sitβwhich may adversely affect its stability.
(g) Photographs ，drawings and figures accomp個ying the reports as appropriate.
(h) Major construction problems encountered and any remedial action carried out.
4. Insoection Records
(吋 Dates and times of site visits by Category IIII personne l.
(b) Activities inspected and remarks/comments made by Category IIII personnel during the site inspections.
(c) Actions taken by Category IIII personnel in response to anomalies reported by Category IIIpersonnel andfollow-up actions taken by Category III personnel or other qualified professional responsible for theworks contract in response to Category IIII personnel's advice.
5. Review
(a) A critical review based on all information collected in the preceding items to check whether the designassumptions are still valid.
(b) Anticipated geotechnical problems and contingency measures ，including actions to be taken when themonitoring results approach the "designed alert levels".
GCDIST 95 (Apr 2012) P.2
AttachmentNo.2
Key Records on Supervision of Soil Nailing Works
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AttachmentNo.3
Extent of Supervision of Soil Nailing Works at Critical Stages
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