diff --git a/lab_env_database_structure.sql b/lab_env_database_structure.sql
index 19ddae9..f5f73cd 100644
--- a/lab_env_database_structure.sql
+++ b/lab_env_database_structure.sql
@@ -200,6 +200,87 @@ CREATE TABLE activity_logs (
     FOREIGN KEY (user_id) REFERENCES users(user_id)
 );
 
+-- Master Sampling Methods
+CREATE TABLE master_sampling_methods (
+    MasterSamplingMethodID INT PRIMARY KEY AUTO_INCREMENT,
+    MasterSamplingMethodCode VARCHAR(20) NOT NULL,
+    MasterSamplingMethodName VARCHAR(100) NOT NULL,
+    MasterSamplingMethodStandardRef VARCHAR(100),
+    MasterSamplingMethodMatrix VARCHAR(50),
+    MasterSamplingMethodDescription TEXT,
+    MasterSamplingMethodEquipment TEXT,
+    MasterSamplingMethodProcedure TEXT,
+    MasterSamplingMethodQCRequirements TEXT,
+    MasterSamplingMethodSamplingPoint TEXT,
+    MasterSamplingMethodPreservation TEXT,
+    MasterSamplingMethodContainerType VARCHAR(100),
+    MasterSamplingMethodMinVolume DECIMAL(10,2),
+    MasterSamplingMethodHoldingTime VARCHAR(50),
+    MasterSamplingMethodInterference TEXT,
+    MasterSamplingMethodLimitation TEXT,
+    MasterSamplingMethodSafetyMeasures TEXT,
+    MasterSamplingMethodFieldParameters TEXT,
+    MasterSamplingMethodSamplingFrequency VARCHAR(100),
+    MasterSamplingMethodWeatherRequirement TEXT,
+    MasterSamplingMethodQualityControl TEXT,
+    MasterSamplingMethodReportingRequirement TEXT,
+    MasterSamplingMethodIsActive BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodCreatedAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+    MasterSamplingMethodCreatedUserID INT,
+    MasterSamplingMethodUpdatedAt DATETIME,
+    MasterSamplingMethodUpdatedUserID INT,
+    MasterSamplingMethodDeletedAt DATETIME,
+    MasterSamplingMethodDeletedUserID INT
+);
+
+-- Master Sampling Method Parameters (Parameter yang bisa diuji dengan metode sampling ini)
+CREATE TABLE master_sampling_method_parameters (
+    MasterSamplingMethodParameterID INT PRIMARY KEY AUTO_INCREMENT,
+    MasterSamplingMethodID INT,
+    MasterParameterID INT,
+    MasterSamplingMethodParameterIsDefault BOOLEAN DEFAULT FALSE,
+    MasterSamplingMethodParameterIsActive BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodParameterCreatedAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+    MasterSamplingMethodParameterCreatedUserID INT,
+    MasterSamplingMethodParameterUpdatedAt DATETIME,
+    MasterSamplingMethodParameterUpdatedUserID INT,
+    MasterSamplingMethodParameterDeletedAt DATETIME,
+    MasterSamplingMethodParameterDeletedUserID INT
+);
+
+-- Master Sampling Method Equipment (Peralatan yang dibutuhkan untuk metode sampling ini)
+CREATE TABLE master_sampling_method_equipment (
+    MasterSamplingMethodEquipmentID INT PRIMARY KEY AUTO_INCREMENT,
+    MasterSamplingMethodID INT,
+    MasterEquipmentID INT,
+    MasterSamplingMethodEquipmentQuantity INT,
+    MasterSamplingMethodEquipmentIsRequired BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodEquipmentNotes TEXT,
+    MasterSamplingMethodEquipmentIsActive BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodEquipmentCreatedAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+    MasterSamplingMethodEquipmentCreatedUserID INT,
+    MasterSamplingMethodEquipmentUpdatedAt DATETIME,
+    MasterSamplingMethodEquipmentUpdatedUserID INT,
+    MasterSamplingMethodEquipmentDeletedAt DATETIME,
+    MasterSamplingMethodEquipmentDeletedUserID INT
+);
+
+-- Master Sampling Method Competencies (Kompetensi yang dibutuhkan untuk metode sampling ini)
+CREATE TABLE master_sampling_method_competencies (
+    MasterSamplingMethodCompetencyID INT PRIMARY KEY AUTO_INCREMENT,
+    MasterSamplingMethodID INT,
+    MasterCompetencyID INT,
+    MasterSamplingMethodCompetencyIsRequired BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodCompetencyNotes TEXT,
+    MasterSamplingMethodCompetencyIsActive BOOLEAN DEFAULT TRUE,
+    MasterSamplingMethodCompetencyCreatedAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+    MasterSamplingMethodCompetencyCreatedUserID INT,
+    MasterSamplingMethodCompetencyUpdatedAt DATETIME,
+    MasterSamplingMethodCompetencyUpdatedUserID INT,
+    MasterSamplingMethodCompetencyDeletedAt DATETIME,
+    MasterSamplingMethodCompetencyDeletedUserID INT
+);
+
 -- Insert sample data for testing
 
 -- Sample Users
@@ -322,4 +403,119 @@ INSERT INTO activity_logs (user_id, action, table_name, record_id, details, ip_a
 (3, 'UPDATE', 'samples', 1, 'Sample received at laboratory', '192.168.1.102'),
 (3, 'CREATE', 'analysis_results', 1, 'Recorded pH analysis result', '192.168.1.102'),
 (4, 'UPDATE', 'analysis_results', 1, 'Verified analysis result', '192.168.1.103'),
-(5, 'CREATE', 'reports', 1, 'Created report LHU-2025-001', '192.168.1.104'); 
\ No newline at end of file
+(5, 'CREATE', 'reports', 1, 'Created report LHU-2025-001', '192.168.1.104'); 
+
+-- Insert contoh data Master Sampling Methods
+INSERT INTO master_sampling_methods (
+    MasterSamplingMethodID,
+    MasterSamplingMethodCode,
+    MasterSamplingMethodName,
+    MasterSamplingMethodStandardRef,
+    MasterSamplingMethodMatrix,
+    MasterSamplingMethodDescription,
+    MasterSamplingMethodEquipment,
+    MasterSamplingMethodProcedure,
+    MasterSamplingMethodQCRequirements,
+    MasterSamplingMethodSamplingPoint,
+    MasterSamplingMethodPreservation,
+    MasterSamplingMethodContainerType,
+    MasterSamplingMethodMinVolume,
+    MasterSamplingMethodHoldingTime,
+    MasterSamplingMethodSafetyMeasures,
+    MasterSamplingMethodFieldParameters,
+    MasterSamplingMethodCreatedUserID
+) VALUES 
+(1, 'WW-GRAB', 'Grab Sampling Air Limbah',
+    'SNI 6989.59:2008',
+    'Air Limbah',
+    'Pengambilan sampel sesaat untuk pemantauan kualitas air limbah',
+    'Water sampler, botol sampel, pH meter, termometer',
+    'Bilas alat 3x, sampling pada kedalaman 30cm dari permukaan',
+    'Field duplicate 10%, field blank harian',
+    'Inlet dan outlet IPAL, titik penaatan',
+    'H2SO4 untuk COD/BOD, HNO3 untuk logam',
+    'Polyethylene untuk umum, kaca untuk minyak lemak',
+    2.50,
+    '24 jam pada 4°C',
+    'APD standar: safety shoes, sarung tangan, masker',
+    'pH, suhu, debit',
+    1),
+
+(2, 'EMI-ISO', 'Isokinetic Sampling Emisi',
+    'SNI 7117.2:2009',
+    'Emisi Udara',
+    'Pengambilan sampel isokinetik pada cerobong industri',
+    'Isokinetic sampling kit, filter holder, pitot tube',
+    'Tentukan titik grid, sampling minimal 1 jam per titik',
+    'Leak check pre/post sampling, blanko filter',
+    'Minimal 8 titik pada 2 diameter berbeda',
+    'Tidak ada',
+    'Filter fiber glass',
+    0.00,
+    'Analisis dalam 48 jam',
+    'Full APD: safety shoes, helm, masker full face',
+    'Temperatur, tekanan, kecepatan',
+    1);
+
+-- 2. Master Sampling Method Parameters
+INSERT INTO master_sampling_method_parameters (
+    MasterSamplingMethodParameterID,
+    MasterSamplingMethodID,
+    MasterParameterID,
+    MasterSamplingMethodParameterIsDefault,
+    MasterSamplingMethodParameterCreatedUserID
+) VALUES 
+-- Untuk Air Limbah (WW-GRAB)
+(1, 1, 1, TRUE, 1),   -- pH
+(2, 1, 2, TRUE, 1),   -- BOD
+(3, 1, 3, TRUE, 1),   -- COD
+(4, 1, 4, TRUE, 1),   -- TSS
+(5, 1, 5, FALSE, 1),  -- Minyak & Lemak
+
+-- Untuk Emisi (EMI-ISO)
+(6, 2, 10, TRUE, 1),  -- Partikulat
+(7, 2, 11, TRUE, 1),  -- SO2
+(8, 2, 12, TRUE, 1),  -- NOx
+(9, 2, 13, FALSE, 1); -- CO
+
+-- 3. Master Sampling Method Equipment
+INSERT INTO master_sampling_method_equipment (
+    MasterSamplingMethodEquipmentID,
+    MasterSamplingMethodID,
+    MasterEquipmentID,
+    MasterSamplingMethodEquipmentQuantity,
+    MasterSamplingMethodEquipmentIsRequired,
+    MasterSamplingMethodEquipmentNotes,
+    MasterSamplingMethodEquipmentCreatedUserID
+) VALUES 
+-- Untuk Air Limbah (WW-GRAB)
+(1, 1, 1, 1, TRUE, 'Water sampler volume 1L', 1),
+(2, 1, 2, 2, TRUE, 'Botol PE 2L', 1),
+(3, 1, 3, 1, TRUE, 'pH meter portable', 1),
+(4, 1, 4, 1, TRUE, 'Termometer', 1),
+(5, 1, 5, 1, FALSE, 'Cool box', 1),
+
+-- Untuk Emisi (EMI-ISO)
+(6, 2, 10, 1, TRUE, 'Isokinetic sampling kit', 1),
+(7, 2, 11, 1, TRUE, 'Filter holder diameter 47mm', 1),
+(8, 2, 12, 1, TRUE, 'Pitot tube tipe S', 1),
+(9, 2, 13, 1, FALSE, 'Termometer cerobong', 1);
+
+-- 4. Master Sampling Method Competencies
+INSERT INTO master_sampling_method_competencies (
+    MasterSamplingMethodCompetencyID,
+    MasterSamplingMethodID,
+    MasterCompetencyID,
+    MasterSamplingMethodCompetencyIsRequired,
+    MasterSamplingMethodCompetencyNotes,
+    MasterSamplingMethodCompetencyCreatedUserID
+) VALUES 
+-- Untuk Air Limbah (WW-GRAB)
+(1, 1, 1, TRUE, 'Sertifikat sampling air limbah', 1),
+(2, 1, 2, TRUE, 'Pelatihan K3 dasar', 1),
+(3, 1, 3, FALSE, 'Pelatihan analisis lapangan', 1),
+
+-- Untuk Emisi (EMI-ISO)
+(4, 2, 4, TRUE, 'Sertifikat sampling emisi', 1),
+(5, 2, 5, TRUE, 'Sertifikat bekerja di ketinggian', 1),
+(6, 2, 6, TRUE, 'Pelatihan K3 lanjutan', 1);
\ No newline at end of file