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Page 22
EPA Mode
UVTOCIntroduction.fm
Section 1
1.10 EPA Mode
The selection of the EPA application allows the analyzer to be operated
compliant with the requirements of the EPA regulation (Part IV- Environmental
Protection Agency/40 CFR Parts 9, 141 & 142). TOC
1
is TOC concentration in
mg/L of the incoming raw water source. TOC
2
is the TOC concentration in
mg/L of the processed (distributed) water. The removal percentage (REM%)
is calculated as follows:
Where TOC
1
is measured a period of at least the retention time earlier than
the measurement of TOC
2
. The TOC data points are retained at the time that
the analyzer goes offline. Only the last Stream 2 TOC value is recorded for the
REM% calculation, however the analyzer records a history of the Stream 1
TOC values.
The pass or fail criteria is based on the manually entered incoming water
alkalinity value and the analyzed incoming source water TOC concentration
(TOC
1
). A pass/fail can be determined and shown on the normal operating
screen according to the value of the required removal percentage. The
following table details how the pass/fail criteria is established from the entered
alkalinity (as mg/L C) and the two TOC readings.
REM% 100
=
TOC
1
TOC
2
–
( )
TOC
1
-------------------------------------------
×
Table 1 Establishing the Pass/Fail Criteria
Source Water Alkalinity
0--60 > 60 – 120 >120
Source Water TOC mg/L (Stream 1) Removal % Removal % Removal %
>2.0 – 4.0 35 25 15
>4.0 – 8.0 45 35 25
>8.0 50 40 30
Table 2 Hardware Requirements
4195-1010-EPA CRS 5 mg/L, 1 UV, 2 STREAM
4195-1020-EPA CRS 10 mg/L, 1 UV, 2 STREAM
4195-1030-EPA CRS 25 mg/L, 1 UV, 2 STREAM
4195-3010-EPA SS 5 mg/L, 1 UV, 2 STREAM
4195-3020-EPA SS 10 mg/L, 1 UV, 2 STREAM
4195-3030-EPA SS 25 mg/L, 1 UV, 2 STREAM