relevant contribution periods under the ESI Act, Ext.P8 demand notice was served on the petitioner, calling upon it to effect the payment of the required contribution in respect of wages paid to workers for the construction work that was undertaken on behalf of the petitioner. The contribution was demanded for the period from 01.04.2008 to 31.03.2011 and was quantified at Rs.1,32,86,513/-. On receipt of Ext.P8 demand notice, the petitioner preferred Exts.P9 to P12 replies, along with connected documents, pointing out that it did not have the requisite details with regard to the workers employed by the contractor, and the payment of wages effected by the contractors to the said workers, and requesting the 2nd respondent to confirm the demand against the petitioner only in respect of the wages paid by the petitioner and by excluding the contribution in respect of the wages paid by the contractors. The request of the petitioner was not considered favourably by the 2nd respondent, who proceeded to pass Ext.P13 order confirming the demand to an extent of Rs.24,16,669/- on the petitioner. In the writ petition, Ext.P13 order of the 2nd respondent is impugned primarily on the contention that, inasmuch as a substantial portion of the construction work was done through