NATURE OF PROJECT: RESISTIVITY SURVEY
CLIENT: ABLE RIDGE SDN BHD
DURATION: FEB – MAY 2018
BACKGROUND AND METHODOLOGY
The survey was carried out to investigate the subsurface condition of material and identify the distribution of rock head boundaries. The 2-D electrical imaging method (2-DERT) can adequately accomplish the desired objectives. The result of the survey was correlated with existing boreholes data.
RESULT AND DISCUSSION

The resistivity inversion model produced by Res2Dinv correlated with existing onsite boreholes. Figure 2 shows the correlation of the line L1 with BH1 and L2 with BH2 respectively. Generally, the correlation results of L1:BH1 and L2:BH2 shows that the resistivity value of weathered rock grade IV (medium dense to dense silty SAND); ranged of 788 ohm.m to 1102 ohm.m and the bedrock/rockhead (Grade III) ranged from 3894 ohm.m to 7046 ohm.m. Bedrock encountered in BH1 at the depth of 1.0m while BH2 at the depth of 7.5m. The correlation results (resistivity values) were applied to all the resistivity inversion model of L1-L3 to investigate the ground subsurface of the study site.
GEOLOGICAL INTERPRETATION
The lithologies in the area are simplified into three; Weathered Granite of Grade IV to V (medium dense to dense Silty Sand), Bedrock/Boulders of Granite, and Saturated Zone of Weathered Granite. Generally, Weathered Granite of Grade IV represent the rock materials in the subsurface which half of the material have been decomposed or disintegrated into soil. Bedrock/Boulders represent the general granitic massive body and the bedrock of the study area and Saturated Zone of Weathered Granite.

CONCLUSION
The subsurface is made up of soil and rock material consist of a Grade II to III granite, weathered Granite of Grade IV to V (medium to dense layers of soil) and saturated zone of weathered granite. BH1 and Resistivity L1 that was correlated confirm the occurrences of bedrock (Grade III Granite) at 1m below existing ground level. But, as it goes down the slope, the bedrock is deeper at about ~7m below the existing ground level. BH2 and Resistivity L2 also correlated and found that the bedrock (Grade III Granite) encountered at 7.5m below existing ground level (based on borehole).