LAC 51:XII.1313. Amendment to the Step 1 Required Removal of TOC Matrix Table under 40 CFR 141.135(b)(2) to Clarify ACC #1

A. In order to clarify the requirements for a system to be able to achieve ACC #1, the "Step 1 Required Removal of TOC by Enhanced Coagulation and Enhanced Softening for Subpart H Systems Using Conventional Treatment" matrix table under 40 CFR 141.135(b)(2) is hereby amended to read as follows. STEP 1 REQUIRED REMOVAL OF TOC BY ENHANCED COAGULATION AND ENHANCED SOFTENING FOR SUBPART H SYSTEMS USING CONVENTIONAL TREATMENT 1, 2 Source-Water TOC, mg/L | Source-Water Alkalinity, mg/L as CaCO3 (in percentages) Source-Water TOC, mg/L | 0-60 | >60-120 | >1203 >2.0-4.0 | 35.0 | 25.0 | 15.0 >4.0-8.0 | 45.0 | 35.0 | 25.0 >8.0 | 50.0 | 40.0 | 30.0 1Systems meeting at least one of the conditions in Paragraph (a)(2)(i)-(vi) of 40 CFR 141.135 are not required to operate with enhanced coagulation. 2Softening system meeting one of the alternative compliance criteria in Paragraph (a)(3) of 40 CFR 141.135 are not required to operate with enhanced softening. 3System practicing softening must meet the TOC removal requirements in this column.