A. No person shall cause or allow effluent from a community sewerage system to discharge to a watercourse in the Rio Grande Basin between the headwaters of Elephant Butte Reservoir and Angostura Diversion Dam as described in Subsection E of this Section if the effluent, as indicated by:

1. (1) any two consecutive daily composite samples;
2. (2) more than one daily composite sample in any thirty-day period (in which less than ten (10) daily composite samples are examined);
3. (3) more than ten percent (10%) of the daily composite samples in any thirty-day period (in which ten (10) or more daily composite samples are examined); or

4. (4) a grab sample collected during flow from an intermittent or infrequent discharge

   1. (a) Bio-chemical Oxygen Demand (BOD) Less than 30 mg/l
   2. (b) Chemical Oxygen Demand (COD) Less than 80 mg/l
   3. (c) Settleable Solids Less than 0.1 mg/l
   4. (d) Fecal Coliform Bacteria Less than 500 organisms per 100 ml
   5. (e) pH Between 6.6 and 8.6

   does not conform to the following:

E. The following is a description of the Rio Grande Basin from the headwaters of Elephant Butte Reservoir to Angostura Diversion Dam as used in this Section. Begin at San Marcial USGS gauging station, which is the headwaters of Elephant Butte Reservoir Irrigation Project, thence northwest to U.S. Highway 60, nine miles + west of Magdalena; thence west along the northeast edge of the San Agustin Plains closed basin; thence north along the east side of the north plains closed basin to the Continental Divide; thence northly along the Continental Divide to the community of Regina on State Highway 96; thence southeasterly along the crest of the San Pedro Mountains to Cerro Toledo Peak; thence southwesterly along the Sierra de Los Valles ridge and the Borrego Mesa to Bodega Butte; thence southerly to Angostura Diversion Dam which is the upper reach of the Rio Grande in this basin; thence southeast to the crest and the crest of the Manzano Mountains and the Los Pinos Mountains; thence southerly along the divide that contributes to the Rio Grande to San Marcial gauging station to the point and place of beginning; excluding all waters upstream of Jemez Pueblo which flow into the Jemez River drainage and the Bluewater Lake. Counties included in the basin are:

1. (1) north portion of Socorro County;
2. (2) northeast corner of Catron County;
3. (3) east portion of Valencia County;
4. (4) west portion of Bernalillo County;
5. (5) east portion of McKinley County; and

6. (6) most of Sandoval County.

   [3-14-71, 9-3-72, 8-13-76, 2-20-81, 12-1-95; 20.6.2.2102 NMAC - Rn, 20 NMAC 6.2.II.2102, 1-15-01]