Soil Investigation with Sondir Testing

For construction projects in Central Lombok, soil investigation using Sondir (Cone Penetration Test) is a standard requirement before foundation design. This article explains the scope of a typical sondir package, why it matters, and the indicative cost for one test points.

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Why Sondir Testing Is Required

Sondir testing provides essential geotechnical data, including:

• Soil Bearing Capacity: Determines allowable foundation loads.
• Layer Profile: Identifies soil strata and depth of hard layers.
• Groundwater Level: Critical for waterproofing and drainage design.
• Compliance: Required for structural permit (PBG) and SLF certification.

Skipping this step can lead to foundation failure, uneven settlement, and costly remedial works.

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Scope of a Standard Sondir Package

For villas, resorts, or commercial buildings in Central Lombok, a typical sondir investigation includes:

1. Mobilization of Equipment

Portable rigs suitable for Lombok terrain.

1. 0ne Test Points

Positioned based on building footprint and load distribution.

1. Field Data Collection

Cone penetration resistance recorded at intervals (usually every 20 cm).

1. Groundwater Observation

Depth noted during testing.

1. Geotechnical Report

Includes:

• Soil profile diagrams
• Bearing capacity calculations
• Recommendations for foundation type and depth

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Indicative Cost for 2025

• Sondir Test (1 Points + Report): Rp 3,000,000

(Central Lombok reference pricing)

Notes:

• Price assumes accessible site and standard depth (usually 10–15 m).
• Remote locations or deeper tests may increase cost.
• Additional boreholes or lab tests (Atterberg limits, moisture content) are separate.

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Practical Considerations for Investors

• Schedule Early: Soil testing should occur before finalizing structural drawings.
• Document for Permits: Reports must be attached to OSS and PBG submissions.
• Integrate Results: Foundation design should reflect bearing capacity and groundwater data.

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Compliance and Risk Management

Indonesian building regulations require geotechnical data for significant structures. Inspectors will verify that foundation design aligns with soil test results. Proper documentation supports smooth SLF issuance after completion.

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Pricing Disclaimer (2025)

The cost stated above is indicative as of 2025 for Central Lombok. Actual pricing may vary by location, site access, and depth requirements. Always confirm current rates and scope with certified geotechnical providers before scheduling work.

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Summary

Sondir testing with 1 points and a formal report at Rp 3,000,000 provides essential data for safe and compliant construction in Central Lombok. This modest upfront investment reduces structural risk, prevents costly redesigns, and ensures regulatory approval for villas, resorts, and commercial buildings.

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