STANDARD OPERATING PROCEDURES QUALITY ASSURANCE AND QUALITY CONTROL 04

Transcription

1 STANDARD OPERATING PROCEDURES SOP QUALITY ASSURANCE AND QUALITY CONTROL 04 SAMPLING Sampling for inspection and control of surface area demined and searched by metal detector DOMAIN: HUMANITARIAN DEMINING TO 523 QUALITY ASSURANCE TERMS AND DEFINITIONS GENERAL REQUIREMENTS AND ACCEPTABLE QUALITY LEVEL (AQL) SAMPLING PLAN LOT ACCEPTABILITY NON-CONFORMING ITEMS - ENTITIES QUALITY LEVEL ACCEPTABILITY CRITERIA INSPECTION LEVEL QUALITY CONTROL AND MEASUREMENT RESULTS ANALYSIS EXAMPLES OF SAMPLING DOCUMENTING QUALITY CONTROL DEMINING TECHNICAL SURVEY Class: Ref.no: CROMAC DIRECTOR: Oto Jungwirth January, 2006

2 CONTENT Content..2 Introduction 3 I QUALITY ASSURANCE Sampling Sampling for Inspection and Control of Surface Area by Metal Detector.5 1 Implementation Sphere Referring to Other Standards.5 3 Terms and Definitions.5 4 General Requirements and Acceptable Quality Level (AQL) 7 5 Sampling Plan..8 6 Proposed Sampling Procedure Scheme 11 7 Quality Control and Measurement Results Analysis 13 8 Documenting APPENDIX..22 II QUALITY CONTROL.39 Quality Control Over Executed Demining Operations.39 Quality Control Over Executed Demining Operations.41

3 INTRODUCTION The aim of this standard is quality assurance and quality control of surface area searched by metal detectors or mine detection dogs. Scientific methods of quality control have been applied in order to avoid subjective judgements and estimates of QA Officers and QC Monitors of the quality of surface area searched by metal detector or MDDs. Tasks to be performed by QA Officers and QC Monitors are: 1. To apply methods of searched surface area control on the basis of this SOP 2. Keep records of control results 3. Evaluate controlled surface area 4. Make a decision on acceptance (non-acceptance) of searched entity Explanation Final beneficiaries of humanitarian demining program have to be sure that searched and demined area is completely safe for use. This requires high management level and detailed operating procedures providing the highest quality control over searched and demined MSA. General principles and procedures for inspection and sampling were developed by the International Organization for Standardization (ISO), and those principles and procedures accepted are published in ISO ISO procedures applied to Quality Assurance (QA) and sampling (based on statistic analysis) provide the rules by which it is easier to decide on the quality of the product. When humanitarian demining is about, product means searched and/or demined area. Sampling results of searched and/or demined area influence a great deal the way the soil sample is selected. Strict procedures for representative sample selection are also required. If the procedures are not prescribed and abided, the Quality Assurance can be influenced by subjective opinion of the QC Monitor and QA Officer. This SOP regulates one of the methods of monitoring surface area inspected by metal detector and that is the inspection of treated soil by attributes (rightwrong). Sampling is performed using random sampling method based on ISO , i.e. HRN ISO : «Sampling procedures for inspection by attributes». Sampling plans are indexed according to acceptable quality level (Acceptable Quality Level AQL) for the lot-by -lot inspection. In this way, quality follow-up and control in humanitarian demining domain is made possible.

4 QUALITY ASSURANCE

5 Sampling sampling for inspection and control of surface area by metal detector 1 Implementation Sphere This SOP provides the guidelines for the implementation of Quality Assurance (QA) over searched and/or demined land area applying the sampling plans indexed according to acceptable quality level (AQL) for lot-by-lot inspection of demined/searched land area. SOP defines terms, establishes management system and procedures based on ISO 2859 and HRN ISO documents and provides instructions on implementation of those procedures. 2 Referring to Other Standards List of normative references is given in the Appendix A. Normative references are important documents this standard pleads to and they make a part of this standard s regulations. All standards are being modified so it is required to follow the list of international standards currently in force. Members of IEC and ISO have the lists of international standards registered. 3 Terms and Definitions Terms and definitions used in this SOP are in compliance with ISO 3534, IMAS and HRN ISO Complete dictionary of all terms and definitions used in the series of IMAS are stated in IMAS Incorrectness: Deviation from the characteristic of quality (detection of mines, UXO and their fragments with explosive substances) which results in a fact that searched mine suspected areas do not meet the requirements set by the pilot project or the contract. 3.2 Non-conformity: deviation from the characteristic of quality which results in the fact that mine suspected areas searched by metal detector or MDDs do not meet certain requirements. Example: If required soil clearance from mines, UXO and their fragments is up to the depth determined by the project (Book of Amendments on Rules and Regulations on Methods of Demining NG 123/05, Article 5) non-conformities are classified into three classes: Non-conformity of the class A separately detected and identified metal mine or UXO fragment with no explosive substance and of length L and diameter D greater than 10 cm. AQL value is very small. Measurement whose value is smaller than the stated ones is not allowed in the selected sample. Critical defect the sample is not accepted. Non-conformity of the class B separately detected and identified metal mine or UXO fragment with no explosive substance and of length L and diameter D from 5 to 10 cm. AQL value is bigger than the one at the class A and smaller than the one at the class C.

6 Non-conformity of the class C - separately detected and identified metal mine or UXO fragment with no explosive substance and of length L or diameter D from 3 to 5 cm. AQL value is bigger than the one at the class B. 3.3 Non-conforming item: searched area item that consists of one nonconformity at least. Non-conforming items are classified into two classes: The item of the class A the item that consists of one or more nonconformities of the class A but can also consist of non-conformities of the class B and/or class C. The item of the class B the item that consists of one or more nonconformities of the class B, it can also consist of non-conformities of the class C but it does not consist of non-conformity of the class A. 3.4 Acceptable Quality Level (AQL): when mine suspected area continuously searched by metal detectors i.e. MDDs on a weekly (daily) basis is concerned, the quality level (detection of mine or UXO fragment up to the depth determined by the project) which, in terms of weekly (daily) inspection of quality by sampling, makes the border value of acceptable average of the process (see Point 5). 3.5 Percentage of non-conforming items: the percentage of non-conforming items (soil clearance from mine or UXO metal fragments less than required one) in any quantity of product item given (for example: 15 measurements in searched surface area of the size 5 m 10 m) is equal to the ratio of the number of non-conforming items and total number of product items (of measured minefield length or diameter) multiplied by Sampling plan: special plan which shows how many items (selected entities) from every daily or weekly treated surface area should be controlled (sample size or a line of sample sizes) and joined criteria for defining the acceptability of daily or weekly treated (searched) surface area (numbers of acceptances and rejections). 3.7 Sampling scheme: the combination of sampling plans and transition procedures. 3.8 Sampling system: the collection of plans or sampling schemes. This part of ISO 2859 sampling system is indexed by lot size ranges (daily or weekly treated area), levels of survey and AQL values. Sampling system for LQ plans is given in ISO standard. 3.9 Inspection: the process of soil inspection by metal detector, checking, examination, measurement of length or diameter of mine or UXO metal fragment found Original inspection: the first inspection of the area of special quality, previously searched, unlike the inspection by metal detector or MDDs of the area that has to be submitted for inspection all over again upon original nonacceptance.

7 3.11 Inspection by attributes: the inspection during which the product item (treated entity) is evaluated simply as conformed or non-conformed, or the non-conformities per product item are being counted with regard to the requirement or group of requirements given Treated MSA (product) item: the item (weekly or daily surface areas inspected by metal detector or mine detection dogs) controlled in order to be classified into the class of conforming or non-conforming items or in order to count the number of non-conformities on the selected area The lot of demined/searched MSA: the collection of inspected MSA (m²) items daily or weekly inspected surface area, inspected by metal detector or MDDs, from which the sample should be taken and inspected in order to define the compliance with acceptance criteria Lot size: number of product items in the lot (number of selectedsearched entities in weekly or daily inspected surface area using metal detectors or MDDs) Sample: the sample consists of one or more entities of treated MSA taken from weekly or daily inspected surface area (lot); the sample items are chosen randomly regardless of their quality. Sample size is equal to the number of product items in the sample Critical incorrectness: Detection of mines, UXO and their fragments. 4 General Requirements and Acceptable Quality Level (AQL) Monitoring and quality control are an important part of the humanitarian demining management process whose goal is to verify the quality of mine search on mine search projects and establish required quality level according to Rules and Regulations on Methods of Demining and contractual obligations. Non-conformity on mine search projects is presented as the number of nonconforming items (L or D) detected and identified metal mine and UXO fragments with no explosive substance up to depth determined by the project. In the tables (see Table 3-A, 3-B and 3-C) to be applied at one-time sampling it is assumed that the non-conformities appear by accident and statistically independently. The term acceptable quality level AQL used in ISO , HRN ISO and this SOP refers to the objective mathematical possibility of reaching required quality level up to the depth determined by the project. The acceptable quality level (AQL) is used for indexing sampling plans and schemes given in HRN ISO together with the code letters (see Table 2). AQL is the mark for non-conforming items percentage value (or number of non-conformities on 100 items can be 50; 100 or 200 m² of searched mine suspected area, see Table 1) that will be, by sampling scheme required to be used, accepted the largest number of times. When it comes to demining and mine search projects, the AQL represents reaching clearance from metal mine and/or UXO fragments with no explosive

8 substance up to the depth determined by the project and which makes the border value of acceptable average. Sampling plans given are prepared in a way that the acceptance probability for denoted AQL value for AQL given depends on the sample size. Efficiency and value of expert monitoring by sampling for the purpose of checking the clearance from metal mine and/or UXO fragments with no explosive substance up to depth determined by the project requires mine search to be complete and controlled. Complete process implies that each entity to be inspected includes the land area searched by metal detecto or MDDs. In order to avoid excessive rejection of daily searched area, it is expected that the surface area will be cleared from mine/uxo fragments up to depth determined by the project. Acceptable Quality Level (AQL) to be used is defined by the contract or technical survey and/or demining project. 5 Sampling Plan There is a number of alternative sampling methodologies possible to be applied. Statistically valid sampling system is described in this paper for the needs of this Standard Operating Procedure. Minimal overall area to be inspected upon MSA treatment will be calculated using the numbers arising from HRN ISO (see Appendix A: Table 1). Some parts of treated soil to be inspected will be selected by inspectors using random sampling method. The positions of surface area control units, surface area in the sample inspected by metal detector or MDDs are selected in a way to cover the entire sample surface area (see the Appendix E). 5.1 Lot Formation Mode Daily or weekly searched mine suspected area using metal detector or MDDs is formed into a recognizable lot, sub-lot or in some other adequate form. 5.2 Lot Acceptability Lot acceptability is determined by using sampling plan or sampling plans joined to a denoted AQL or denoted AQLs (see Tables 3-A, 3-B and 3-C). The term non acceptance is used instead of rejection when it relates to the result ensuing from the procedure. The inspector decides how to treat non-accepted lots. Such lots can be searched once again using one of the methods allowed, according to the Execution plan. 5.3 Non-conforming Items Entities The inspector retains the right to reject every daily entity for which it is determined during the inspection to be non-conformed, no matter whether the entity is a part of weekly sample or not, even when the lot as an entity is accepted. Rejected entities can be remedied and inspected all over again with the approval and in a way specified by the inspector.

9 5.4 Sampling When it is appropriate, the number of entities in a sample is selected in proportion to the size of daily or weekly inspected MSA established according to the Table 1. Samples can be determined upon weekly or daily work (searching/demining) or during daily/weekly search/demining when the works interruption is in progress for whatever reasons. In any case, the samples are selected at random. Sample is selected according to method of demining, that is, mine search separately for each executor, i.e. sample is taken separately for each inspection mode and each executor (for example: sample no.1 for action lane surface area of the company «a», sample no.2 for the area searched by mine detection dogs of the company «a»; samples no.3 and 4 for action lane surface area of the company «b», sample no. 5 for surface area searched by mine detection dogs of the company «b», sample no.6 for surface area searched by manual detection of the company «b») Types of Inspection There are three types of inspection: normal, tightened or reduced (see Table 1 and Tables 3-A, 3-B, 3-C and Picture 1, Appendix C4). At the beginning of inspection, if not decided differently, the inspector conducts the normal inspection. Normal, tightened or reduced inspection is executed on the following lots (entities) without any change except in cases where transition procedures (see HRN ISO , Point 9 and Supplement C4) require inspection type change. Transition procedures are applied independently for each class of conforming or non-conforming items. Rules and procedures of transition are given in HRN ISO Methods of Monitoring and Quality Control CROMAC approves the procedures and the equipment used by the inspector for the inspection of samples of searched and/or demined soil and they will be co-ordinated with accredited demining companies. Any major change in the sampling process, monitoring or quality control should be verified in CROMAC and the accredited demining companies should be informed on stated changes in due time, prior to the commencement of monitoring and quality control Quality Level Acceptability Criteria The entity will be considered as properly searched only if the AQL criteria are met. If any sample of the entity comprises one or more detections of mines, UXO or their fragments, that will create the critical non-conformity (nonacceptability/unallowed defect), the entity that comprises that sample will not pass the final inspection/quality control. Searched soil can comprise single detections of mine and/or UXO metal fragments without explosive substance of a certain length L or diameter D i.e. nonconformities classified into classes A, B or C. Such cases would indicate possible defect and create critical defect again. Terms for acceptance or non-acceptance of all non-conformity categories are presented in the Appendix D.

10 5.5.2 Inspection Level The inspector can define required quality level for each special application with regard to the possibility of work with metal detector, that is, mine detection dogs as per CROMAC SOP (Efficiency Assessment of Technical Survey and Demining). That provides the inspector the possibility to demand bigger differentiation for some purposes and smaller for the other. Three levels of inspection (I, II and III) for general use are given in the Table 1. If not defined differently, the level II is used. When smaller sample differentiation is required, level I can be used and when bigger differentiation is allowed, the inspection level III is used. For selection of sample size code letters see the APPENDIX A: Table Sample Size Code Letters Sample sizes are marked with code letters. In order to find the applicable code letter for the special lot size and prescribed inspection level Table 1 is used (APPENDIX A) Acceptability Determination of Entity Inspected by Metal Detector In order to determine the lot (entity) acceptability according to the number of nonconforming items, one-time sampling plan is used (see Appendix C: The scheme of one-time sampling and the Tables 3-A, 3-B and 3-C). At single sampling plan, the number of items inspected is equal to the sample size defined by the plan. If the number of non-conforming items found in the sample is equal or smaller than the number of acceptances, entity (lot) is considered to be acceptable. If the number of non-conforming items is equal or bigger than the number of rejections, the entity (lot) is considered to be unacceptable Acceptability Determination of Entity Searched by Mine Detection Dogs During the control of surface area searched by mine detection dogs, metal mine and/or UXO fragments found must contain at least 3 g of explosive substance to be considered as non-conforming. That refers to metal fragments of: war heads, hand grenades, rifle grenades, artillery projectiles, shells, AP mines, fuses etc. Metal mine and/or UXO fragments found with traces of explosive substance (min 3 g) will be considered as non-conformities of the particular class. Other criteria are in compliance with the Point Example 1 Detection of mortar shell fragments containing over 3 g of TNT and 12 cm long will be treated as non-conformity of the class A. Example 2 Detection of stabilizer of mortar shell mine with no traces of explosive substance will not be taken for consideration. Example 3 Detection of DK-8 is incorrectness for it is a part of the mine and not metal fragment with traces of explosive substance.

11 6 Proposed Sampling Procedure Scheme Special sampling plan which defines the number of treated MSA entities to be inspected (sample size) with joined criteria for acceptability determination of daily/weekly treated (searched) area. SAMPLING PROCEDURE SCHEME Lot formation mode Inspection by metal detector or MDD of the entire MSA surface area ( m²) on a daily/weekly basis Lot Acceptability Use of sampling plans joined to denoted AQLs (QA Officer decides how to treat unaccepted lots -SOP) Searched entity non-conforming items Sampling QA Officer rejects every entity established to be non-conformed - rejected entities must be remedied QA Officer/QC Monitor selects the sample using random selection method Quality level acceptance criteria Entity is considered as '' searched properly'' if AQL levels are met NON-CONFORMITIES AND INSPECTION LEVEL

12 NON-CONFORMITY AND INSPECTION Critical non-conformity - incorrectness If the total lot (entity) sample contains one mine, UXO or their fragments Classes of single non-conformity indicators (smaller depths) Non-conformity of the class A Non-conformity of the class B Non-conformity of the class C Non-conforming items of searched entity comprise at least one non-conformity Class A unit Class B unit Unit that comprises one or more non-conformities of the class A, but can also comprise non-conformities of the class B and/or C Unit that comprises one or more non-conformities of the class B, and can also comprise non-conformities of the class C, but does not comprise non-conformities of the class A Inspection level on the basis of the assessment on soil contamination with metal General inspection levels I II III Tables adjusted for the conditions of mechanical MSA search based on ISO Table 1 Sample size code letters Table 3 One-time sampling plans

13 7 Quality Control and Measurement Result Analysis 7.1 Quality Control of Surface Area Inspected by Metal Detector or Mine Detection Dogs and Length Measurement of Mine and UXO Metal Fragments Detected Quality Control of the MSA inspected by metal detector or mine detection dogs during technical survey and/or demining operations does not significantly depend on soil conditions. Sampling is always attended by Contractor representative and he ensures the inspection of selected sample combination (Appendix A, in the example APPENDIX E). For surface areas demined by manual method the sample is inspected according to combinations presented in the Appendix F. In the scheme of selected combination, each square represents 1 (one) m² of inspected surface area. Instead of meter, normal step of the inspector can be used. During quality control of surface areas searched by manual method or MDDs, control items are grouped in a line so the control starts from the safe lane. On the selected spot, where detection of metal has been indicated, the inspector digs up inspected soil in a way to remove the soil carefully by hands, prodder or knife, gradually with maximum safety measures. In case mines, UXO or their fragments are found at detection site, the inspector informs the QA Officer, work site leader and prepares documentation containing information on the following: a) name and type of mines, UXO and their fragments found b) co-ordinates and depth where mines, UXO or their fragments were found c) status of mines, UXO or their fragments found (existence/non-existence of fuse, compactness and completeness of the mine or UXO etc.) d) photodocumentation with clearly presented photographs of the ordnance found, work site and surrounding benchmarks. Mines, UXO or their fragments found should not be moved! In case of detection of mine/uxo metal fragment with no explosive substance, the inspector measures its length L (in case of objects in shape of a prism) or diameter D (in case of objects in shape of a cylinder or a ball). In case of detection of cylinder-shaped fragment, bigger dimension measured is decisive. For example, when a shell is measured, its diameter D is smaller than the length L so length is measured. Measured values of the length L or diameter D of the metal fragment for each sample are entered into the form by the inspector (see Point 8 Documenting).

14 7.2. Example of Sampling of Surface Area Inspected by Metal Detector or Mine Detection Dogs During the soil inspection by metal detector it is required to indicate each metal detection in the soil because it represents a potential possibility for mines, UXO or their fragments to be located on this particular spot, buried in the ground. During the control of inspected surface area by sampling, each detection of mines, UXO or their fragments will be considered as incorrectness. (Entity-lot worked off will not be accepted). All mine and/or UXO metal fragments that remained in the ground up to the depth determined by the project and are equal or greater than 3 cm will be considered as nonconformity in the process of technical survey or demining of surface area. Code Letter Determination Example no.1 Daily demined surface area using the manual method is, for example, m². Sample size code letter is defined using the Table 1 (Appendix A) in the following way: the size of daily lot is under the ordinal number 3 ( m²) sample size is 50 m² and the number of control items i.e. m² in the sample is 10, positioned according to selected combination, for example D1-1 general level (II) is always selected for the control commencement of surface area inspected by metal detector or mine detection dogs Determination of Sample Number (Sample Size) and Acceptable Quality Level (AQL) Upon defining the code letters in the Table 1, one-time sampling plan is selected. At the work beginning, one always proceeds from one-time sampling plans for the normal inspection, Table 3-A (Appendix C1). For the letter code «D» from the table 3-A for normal inspection (see Appendix C) sample size (number) is 5. That means, the inspector chooses 5 samples of 50 m² in the lot (3120 m²) using random sampling method i.e. as per combination for sample size. In each of 5 samples (of the size of 50 m²) the inspector needs to inspect 10 control items i.e. 10 m² (one control item comes to 1 m²).

15 COMBINATION D1-1: Sample size: 5x10 m; number of control items Sample of 50 m Control item (1 m 2 ) 2 1 If mines, UXO or their fragments with explosive substance are found in the sample, the lot is incorrect and it is rejected. Presence of non-conformities in the class A with number of acceptances Ac=0 represent the incorrectness and the lot is rejected. The inspector informs the QA Officer on rejection of the lot as per any regulation stated in this SOP. Non-conformities in the example are defined in a following way: Non-conformity of the class A is: If the metal fragment is a part of a mine and/or UXO with no explosive substance in the sample of the length or diameter greater than 10 cm, number of lot acceptances is Ac=0 and number of rejections is Re=1. It means that the acceptable length or diameter of the metal fragment in the sample is not greater than 10 cm. AQL for this sample is AQL=0,1 (from the Table 3-A). Non-conformity of the class B is: If the length or diameter of the mine and/or UXO metal fragment with no explosive substance in the sample is from 5 to 10 cm, number of lot acceptances is Ac=1, and number of rejections is Re=2. It means that detection of one metal fragment of the length or diameter from 5 to 10 cm is acceptable but detection of two or more metal objects, of the length or diameter

16 from 5 to 10 cm, is not acceptable! AQL for this sample is AQL=1,5 (from the Table 3-A). Non-conformity of the class C is: If the mine and/or UXO metal fragment found in the sample is from 3 to 5 cm long or that much in diameter, number of lot acceptances is Ac=2 and number of rejections is Re=3. It means, detection of two metal fragments of the length or diameter from 3 to 5 cm is acceptable but detection of three or more metal fragments of the same length or diameter is not acceptable! AQL value for this sample is 2.5 (from the Table 3-A). See other examples in the Appendix! CONCLUSION 1 The lot is rejected if mines, UXO or their fragments are found in the sample. This is called incorrectness. Accredited QA Officer is informed on the rejection of the lot. 2 Detection of metal fragment in the sample of the length or diameter greater than 10 cm is not allowed. That is non-conformity of the class A. The lot is rejected if such fragment is found. 3 Detection of two metal fragments of the length or diameter from 5 to 10 cm in the sample is not allowed. One is acceptable. That is nonconformity of the class B. The lot is rejected in case of detection of two such fragments. 4 Detection of three metal fragments of the length or diameter from 3 to 5 cm is not allowed. Two are acceptable. That is called non-conformity of the class C. The lot is rejected in case of detection of three such metal fragments. 5 The inspector is obliged to inform accredited QA Officer as soon as possible on the lot rejection as per any regulation stated in this SOP. QA Officer should further proceed as per Rules and Regulations on Methods of Demining. Example no.2 Sampling of machine action lanes during mine search Sample size code letters are determined as per Table 1 (Appendix A) in the following way: daily lot size is under the ordinal number 3 (1201 to 3200 m²) sample size is 50 m² and number of control items, that is m² in the sample is 10 control items are placed on the action lane surface at random general level (II) is always selected for the control commencement of surface area inspected by metal detector Upon defining code letters in the Table 1, one-time sampling plan is selected. At the beginning of works, one always starts from one-time sampling plan for the normal inspection, Table 3-A (Appendix C19. For the code letter «D» from the Table 3-A for the normal inspection (see Appendix C) sample size (number) is 5.

17 It means, the inspector selects 5 samples of 50 m² in the lot (3120 m²) using random sampling method. In each of these 5 samples (of the size of 50 m²), the inspector needs to inspect 10 control items, i.e. 10 m² (one control item comes to 1 m²) Control items of 1 m 2 placed randomly on the sample (that is per 50 m 2 of searched action lanes) 1 10 Example no.3 Sampling of action lanes during mine search Surface area searched by MDDs on a daily basis (fields 10 x 10 m) is, for example, 3100 m². Sample size code letters are defined as per Table 1 (Appendix A) in the following way: size of a daily lot is under the ordinal number 3 (1201 to 3200 m²) sample size is 50 m² and number of control items, that is m² in the sample is 10 control items are placed in a line on the field surface area, in groups, so that deminer can start the inspection from inspected action lane general level (II) is always selected for the control commencement of surface area inspected by metal detector Determination of a Number of Samples (Sample Size) and Acceptable Quality Level (AQL) Upon defining code letters in the Table 1, one-time sampling plan is selected. At work beginning, one always starts from one-time sampling plans for the normal inspection, Table 3-A (Appendix C1). For the code letter «D» from the table 3-A for the normal inspection (see Appendix C) sample size (number) is 5. It means, the inspector selects 5 samples of 50 m² in the lot (3120 m²) using random sampling method. In each of the 5 samples (of the size of 50 m²) the inspector needs to inspect 10 control items, that is 10 m² (one control item comes to 1 m²).

18 fields 10 x 10 m searched by MDDs Control items of 1 m 2 Sample of 50 m 2 action lanes searched manually fields 10 x 10 m searched by MDDs Control items of 1 m 2 Sample of 50 m 2 Action lanes searched manually

19 OEIVDPMD-1: Manual entry form REGISTRATION FORM FOR MEASURED VALUES OF THE LENGTH L OR DIAMETER D OF THE MINE AND/OR UXO METAL FRAGMENTS FOUND IN THE SOIL FOR SINGLE SAMPLE Date: ; No. of samples as per plan: ; No. of samples: COMPANY PROJECT CODE PLACE COUNTY TIME OF INSPECTION FROM: TO: NAME AND TYPE OF DETECTOR No. OF DETECTORS SIZE OF THE LOT TO BE INSPECTED (m 2 ) MEASURED VALUES (L or D) OF MINE AND UXO METAL FRAGMENTS FOUND Control unit no. MINE AND/OR UXO METAL FRAGMENTS Mines, UXO and their fragments Total: Greater than 10 cm From 5 to 10 cm From 3 to 5 cm Inspection carried out by: Worksite Leader:

20 DAILY MONITORING REPORT OF SURFACE AREA SEARCHED BY MINE DETECTION DOGS Lot size: m 2 1. Sample surface area: m 2 No. of control items in the sample: Inspection level Code letter Mine search method: MDDs Total number of samples in the lot: (working map) (number) (scale) 2. (edition) (co-ordinate x) (co-ordinate y) NAME OF PROJECT: (works commencement time and date) CLASS A: NON-CONFORMITIES: Greater than 10 cm Length L or diameter D of mine/uxo metal fragment found (PROJECT CODE) CLASS B: From 5 to 10 cm. (works completion time and date) CLASS C : From 3 to 5 cm. Acceptability AQL= AQL= AQL= Acceptance number Rejection number Sample no. Ac=0 Ac=1 Ac=2 Re=1 Re=2 Re=3 No. of mine/uxo metal fragments found Greater than 10 cm pcs From 5 to 10 cm pcs From 3 to 5 cm pcs Mines, UXO and their fragments with explosive substance SAMPLE CO-ORDINATES 5. Total LOT IS: ACCEPTED REJECTED MONITOR'S OBSERVATIONS: (place) (Report by) (date) (signature)

21 DAILY MONITORING REPORT OF SURFACE AREA DEMINED BY METAL DETECTOR Lot size: m 2 1. Sample surface area: m 2 No. of control items in the sample: Selected combination: Inspection level Code letter Mine search method: manual detection Total no. of samples in the lot: (working map) (number) (scale) 2. (edition) (co-ordinate x) (co-ordinate y) NAME OF THE PROJECT: (works commencement time and date) CLASS A: NONCONFORMITIES: Greater than 10 cm Length L or diameter D of mine/uxo metal fragment with no explosive substance found (PROJECT CODE) CLASS B: From 5 to 10 cm. (works completion time and date) CLASS C : From 3 to 5 cm. Acceptability AQL= AQL= AQL= Acceptance number Rejection number Sample no. Ac=0 Ac=1 Ac=2 Re=1 Re=2 Re=3 No. of mine/uxo metal fragments with no explosive substance found Greater than 10 cm pcs From 5 to 10 cm pcs From 3 to 5 cm pcs Mines, UXO and their fragments with no explosive substance SAMPLE CO-ORDINATES 5. Total LOT IS : ACCEPTED REJECTED MONITOR'S OBSERVATIONS: (place) (Report by) (date) (signature)

22 8 APPENDICES APPENDIX A TABLE 1 Sample Size Code Letters No. Lot size m 2 Surface area size of one sample m 2 No. of control items (m 2 ) in the sample General inspection levels I tightened II normal III reduced do A B C do B C D do C D E do D D E do D E F do E F F do E F G do F G H and over G H J

23 APPENDIX B Control sample of n entities or measurements If the number of non-conformities found in the sample is Smaller or equal to the c Greater than c The lot is accepted The lot is rejected Figure 1: One-time sampling scheme

24 SUPPLEMENT C1 : Table 3-A - One-time sampling plans for normal inspection Lot size code letters Sample size 0,01 0,015 0,025 0,04 0,065 0,1 0,15 Acceptable Quality Level, AQL (normal inspection) 0,25 0,4 0,65 1,0 1,5 2,5 4,0 6, Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re A B C D E F G H J = use the first sampling plan bellow the arrow = use the first sampling plan above the arrow Ac = acceptance number Re = rejection number

25 Table 3-B - One-time sampling plans for tightened inspection Lot size code letters Sample size Accept able Qualit y Level, AQL (t ight ened inspect ion) 0,01 0,015 0,025 0,04 0,065 0,1 0,15 0,25 0,4 0,65 1,0 1,5 2,5 4,0 6, Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re A B C D E F G H J = use the first sampling plan bellow the arrow = use the first sampling plan above the arrow Ac = acceptance number Re = rejection number

26 SUPPLEMENT C3: Table 3-C - One-time sampling plan for reduced inspection Lot size code letters Sample size 0,01 0,015 0,025 0,04 0,065 0,1 0,15 Accept able Qualit y Level, AQL (reduced inspect ion) 0,25 0,4 0,65 1,0 1,5 2,5 4,0 6,5 Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re Ac Re A B C D E F G H J = use the first sampling plan bellow the arrow = use the first sampling plan above the arrow Ac = acceptance number Re = rejection number

27 APPENDIX C4: Figure 1 - General outline of transition rule (Point 5.4.1) Start -Previous 10 lots inspected under normal inspection -Previous 10 lots accepted with total number of non-conforming items (or number of nonconformities) equal or less than the border number and -normal soil treatment and -approved by the monitor 2 out of 5 or less successive lots are not accepted 5 lots were not accepted during tightened inspection QUALITY ASSURANCE OFFICER Reduced inspection Normal inspection Tightened inspection -Lot is not accepted or -lot is accepted, but number of non-conforming items (or number of nonconformities) is between acceptance number (Ac) and rejection number (Re) of the plan or -the treatment is inadequate (uneven) or -other conditions indicate the need for transition 5 successive lots accepted REPEAT ACCREDITATION PROCESS

28 APPENDIX D Requisites and equipment used by the inspector: 1 Metal detector 2 Measuring lath with grade level (for measurement of depth of mines, UXO or their fragments found) 3 Ruler or sliding measure 4 Conventional meter (size - 3 m) 5 Measuring tape (size - up to 50 m) 6 GPS 7 Maps

29 APPENDIX E: Examples Example no. 1: Specified: Weekly manually demined surface area is m². Level of inspection tightened (General inspection level I) Solution: 1 It should be read off from the table 1 (Appendix A) that the code letter for the sample from 8001 to m² and tightened level of inspection is E. It means, surface area size of one sample is 100 m ² and a number of control items in the sample is It should be established from the table 3-B (Appendix C1) that the number of samples for the code letter E is 8. Monitor determines the positions of these 8 samples per 100 m² by random sampling method. 3 It means: sample size is 100 m², number of samples 8 and number of control items Control item size is 1 m². A total of 8x15 m² is controlled in the sample. 15 control items are selected in each sample according to combination in the Appendix F. P= m m 2 Figure 1 Scheme of surface area of m² worked off and positions of 8 samples per 100 m² m m Figure 2 Combination scheme of D2 sample (of 100 m² size) with positions of 15 control items

30 Sample dimensions do not have to be 10x10 m. The ration between length and with could be different (for example, 20x5 m, 2x50 m etc.) Detection measurement results: 1 Detection of mines, UXO and their fragments with explosive substance in any sample is considered to be incorrectness. The entirety (all m²) is rejected and control suspended. 2 Detection of mine/uxo metal fragment of the length or diameter greater than 10 cm in any sample is considered as non-conformity of the class A (Ac=0 Re=1). The entirety (all m²) is rejected and control suspended. AQL is 0,4 (Table 3b). 3 Detection of mine/uxo metal fragment of the length or diameter from 5 to 10 cm in any sample is considered to be non-conformity of the class B (Ac=1 Re=2).One metal fragment of the length or diameter from 5 to 10 cm is accepted but in case of detection of two such fragments the entirety should be rejected (all m²). 4 Detection of mine/uxo metal fragment of the length or diameter greater than 3 to 5 cm in any sample is considered to be non-conformity of the class C (Ac=2 Re=3). Two metal fragments of the length or diameter from 3 to 5 cm are accepted but in case of three the entirety is rejected (all m²). AQL is 2,5 (Table 3-b).

31 APPENDIX F COMBINATIONS OF SAMPLES AND CONTROL ITEMS DURING QUALITY CONTROL ON SURFACE AREAS DEMINED BY MANUAL DETECTION COMBINATION D1 1: Sample size 5x10 m; number of control items COMBINATION D1-2: Sample size 5x10 m; number of control items

32 COMBINATION D2 Sample size: 10x10 m; number of control items COMBINATION D2-1 Sample size: 10x10 m; number of control items

33 COMBINATION D2-2 Sample size: 10x10 m; number of control items COMBINATION D3 Sample size: 10x20 m; number of control items

34 COMBINATION D3-1 Sample size: 10x20 m; number of control items COMBINATION D3-2 Sample size: 10x20 m; number of control items

35 DAILY MONITORING REPORT OF SURFACE AREA DEMINED BY METAL DETECTOR Daily lot size: m 2 1. Sample surface area:100 m 2 No. of control items in the sample:15 Selected combination:d2-2 Inspection level I Mine search method: manual detection Code letter E Total no. of samples in the lot: 8 N O V A P E T R I N J A (working map) (number) (scale) (edition) (co-ordinate x) (co-ordinate y) NAME OF PROJECT: P R O B A (POJECT CODE) (works commencement time and date) NONCONFORMITIES: Length L or diameter D of mine/uxo metal fragment with no explosive substance found CLASS A: Greater than 10 cm. (works completion time and date) CLASS B: CLASS C : From 5 to 10 cm. From 3 to 5 cm. 5. Acceptability AQL= AQL= AQL= Acceptance number Rejection number No. Ac=0 Ac=1 Ac=2 Re=1 Re=2 Re=3 No. of mine/uxo metal fragments with no explosive substance found Greater From 5 to From 3 than 10 cm 10 cm Total to 5 cm Mines, UXO and their fragments with e.s. SAMPLE CO- ORDINATES LOT IS : X ACCEPTED REJECTED MONITOR'S OBSERVATIONS: THERE WERE NO METAL FRGAMENTS GREATER THAN 10 CM DETECTED IN THE SAMPLE. THERE WAS A FRAGMENT OF 6 cm DETECTED IN THE SAMPLE 6 BUT NUMBER OF FRAGMENTS DETECTED IS IN COMPLIANCE WITH THE CLASS «B». IN THE SAMPLE 3 THERE WERE TWO FRAGENTS FROM 3 TO 5 CM DETECTED WHAT IS IN COMPLIANCE WITH THE CLASS «C». SMALLER METAL FRAGMENTS (UNDER 3 cm) WERE DETECTED IN OTHER SAMPLES BUT WERE NOT TAKEN INTO CONSIDERATION. THERE WERE NO MINES, uxo OR THEIR FRAGMENTS DETECTED. CONCLUSION ACCEPTANCE OF INSPECTED LOT OF m² PRESENTED ON THE ENCLOSED MAP IS RECOMMENDED (place) (Report by) (date) (signature)

36 Work site scheme with marked sample positions:

37 DAILY MONITORING REPORT OF SURFACE AREA SEARCHED BY MINE DETECTION DOGS Lot size: m 2 1. Sample surface area: 100 m 2 No. of control items in the sample:15 Inspection level I Code letter Mine search method: MDDs E Total no. of samples in the lot:8 (working map) (number) (scale) 2. (edition) (co-ordinate x) (co-ordinate y) NAME OF THE PROJECT: (PROJECT CODE) (works commencement time and date) CLASS A: NONCONFORMITIES: Greater than 10 cm Length L or diameter D of mine/uxo metal fragment found CLASS B: From 5 to 10 cm. (works completion time and date) CLASS C : From 3 to 5 cm. 5. Acceptability AQL= AQL= AQL= Acceptance number Rejection number No. Ac=0 Ac=1 Ac=2 Re=1 Re=2 Re=3 No. of mine/uxo metal fragments found Greater than 10 cm pcs From 5 to 10 cm pcs From 3 to 5 cm pcs Mines, UXO and their fragments DK SAMPLE CO-ORDINATES Total LOT IS : ACCEPTED X REJECTED MONITOR'S OBSERVATIONS: THERE WAS DK-8 DETECTED IN THE SAMPLE NO.6 WHAT REPRESENTS THE INCORRECTNESS SO THE INSPECTOR IS RECOMMENDED TO REJECT THE LOT (place) (Report by) (date) (signature)

38 Work site scheme with marked sample positions:

39 QUALITY CONTROL OVER EXECUTED DEMINING OPERATIONS

40 QUALITY CONTROL OF INSPECTED SURFACE AREA OVER EXECUTED DEMINING OPERATIONS 1 Total sample surface area: Total control sample surface area makes at least 0,5% of totally demined surface area. 2 Repeated inspection of demined surface area: Established: 2.1. Detection of mines and UXO 3 Defining the control samples of demined or searched surface area (P) 3.1 Minimum sample surface area (p min ) is 50 m² 3.2 Minimum number of samples (N) is calculated as per following formula: N = (Px0,005) / p p - control sample surface area Example no.1: P= m² p=50 m² N=( x0,005)/50 N=12 Example no.2: P= m² p=100 m² N=( x0,005)/100 N=12 If the number of samples is a decimal number (for example: 2,9; 7,8; 10,1) it is rounded off to a bigger (whole) number (3; 8; 11) 4 Defining maximum control sample surface area according to the intended use of the land area p max =50 m² For kindergartens, schools, hospitals, houses, yards, paths, roads p max =100 m² For agricultural and forest surface areas and industrial zones p max =150 m² For gas pipelines, oil pipelines, water supply systems, power transmission lines etc. 5 Control sample locations They are selected according to following criteria: 5.1 Over 70% of control sample surface area needs to cover locations of minefields and minefield records, places where mines and UXO were detected and other suspected surface areas (border minefield surface areas, road crossings, etc.) % of control sample surface area can be selected using random sampling method.

41 6 The smallest number of control samples is 2. 7 At least one of the samples should be selected by CROMAC deminer who will perform the sample inspection. Other samples are selected by CROMAC QA Officer.

42 QUALITY CONTROL OVER EXECUTED TECHNICAL SURVEY OPERATIONS

43 QUALITY CONTROL OF INSPECTED SURFACE AREA OVER EXECUTED TECHNICAL SURVEY PROJECTS 1 Total sample surface area: Total control sample surface area makes at least 3% of totally searched surface area. 2 Detection of mines and UXO on the lanes searched by manual method - the company has to DEMINE the entire surface area defined by the project all over again 3 Detection of mines and UXO in the field grid system 3.1 Detection of mines and UXO on the surface area searched by mine detection dogs Mines detected inspection of surface area in the radius of 20 m from the mine found. If another mine is found, surface area will be included into a demining project. If no other mine is found, the company will be ordered to destroy the mines found UXO detected monitor will order accredited legal entity which executed technical survey operations to destroy the UXO found 3.2 Detection of mines and UXO on the surface area searched by mechanical method Mines detected inspection of surface area in the radius of 20 m from the mine found. If another mine is found, surface area will be included into a demining project. If no other mine is found, the company will be ordered to destroy the mines found UXO detected - monitor will order accredited legal entity which executed technical survey operations to destroy the UXO found 3.3 Detection of mines and UXO on the surface area searched by manual method Mines and UXO detected are visible on the surface area the monitor will order demining of project surface area Detected mines and UXO are found below the surface area according to and Defining the control samples of demined or searched surface area (P) 3.1 Minimum sample surface area (p min ) is 100 m² 3.2 Minimum sample number is calculated as per following formula: N= (Px0,03) / p p-control sample surface area Example no.1: P= m 2 p=100 m 2 N=( x0,03)/100 N=36

44 Example no.2: P= m 2 p=300m 2 N=( x0,03)/300 N=24 If the number of samples is a decimal number (for example: 2,3; 7,8; 10,1) it is rounded off to a bigger (whole) number (3; 8; 11). 4 Defining the maximum control sample surface area according to the intended use of the land area p max = 100 m² For kindergartens, schools, hospitals, houses, yards, lanes, roads p max = 200 m² For agricultural and forest surface areas and industrial zones p max = 300 m² For gas pipelines, oil pipelines, water supply systems, power transmission lines etc. 5 Control sample locations Samples are located by random sampling method. 6 The smallest number of control samples is 2. 7 At least one of the samples should be selected by CROMAC deminer who will perform the sample inspection. Other samples are selected by CROMAC QA Officer. The company will be submitted the Report on Handover of Cleared Area upon removal of all the means used for marking the work site (except the final marking).