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Download Excel NPDES Self Monitoring Program
Modoc Joint Unified School District Geothermal Project
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Organization
Modoc Joint Unified School Districtshow partners CVRWQCB
Program website
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Plan contact
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| Start date | 01/27/2005 |
| End date | None |
| Objectives | The Discharger currently uses a geothermal production well AL-1 to heat Modoc High School.
Well AL-1 was drilled in 1988 to 2424 ft and was deepened to 2940 ft in November 1991. Well
AL-1 is located immediately east of the schools garage and maintenance building. To date AL-1 is
the deepest well drilled in the Alturas Basin. AL-1 produces about 50 gpm of water at 83 degree C. Static
wellhead pressure is 40 psi. A review of the 1998-99 monitoring data for AL-1 indicates that the
maximum 24-hour average flow was approximately 114 gpm. Funding for the project was provided
by the California Energy Commission. Well AL-1 has been under production since 1990 for
heating the gymnasium, social hall, wood shop, weight room, art room, auto shop, transportation
and maintenance departments at Modoc High School. The heat is extracted by means of heat
exchangers and a floor slab system, and no chemicals are added to the geothermal water. Use of the
geothermal heating system is seasonal since heating is required only during the winter months.
Annual usage starts in September and lasts until June.
The Discharger discharges spent geothermal water from the geothermal space heating system into a
sub grade storm drain which flows south for approximately 2,000 feet and discharges and
discharges into the North Fork Pit River, approximately 400 feet west of the City of Alturas Main
Street Bridge in Section 13, T42N, R12E, MDB&M, as shown on Attachment A, which is
incorporated herein and made a part of this Order. The site lies within the Pit River Hydrologic
Subarea No. 526.52 as defined on interagency hydrologic maps prepared by the State Department of
Water Resources. Average discharge flows in September, October, and November are about
20 gpm, increasing to 50 gpm by December and gradually decreasing back to 20 gpm by June. |
| Annual budget | None |
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Basins & sub-basins monitored
- Sacramento River (Sacramento River)
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map
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Sites Monitored
| Name |
Code |
Latitude |
Longitude |
Map |
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Pit River, 50 ft US from point of discharge
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R-1 |
41.481389 |
-120.543889 |
locate |
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Stormwater drain pipe to Pit River, containing geothermal discharge
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R-2 |
41.483283 |
-120.544975 |
locate |
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Pit River, North Fork, County Road 54 bridge
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R-3 |
41.475556 |
-120.555 |
locate |
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Parameters Monitored
| Group | Parameters | Frequency |
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| General Water Quality |
pH, Specific Conductance [EC @ 25 deg C], Temperature, Total Dissolved Solids (TDS) |
Monthly |
| Hydrology |
Flow |
Daily |
| Major Ions & Minerals |
Boron |
Other |
| Metals & Trace Elements |
Antimony , Arsenic , Beryllium , Cadmium , Chromium , Chromium VI, Copper , Lead , Nickel , Selenium , Silver , Thallium , Zinc |
Other |
| Priority Pollutants |
Priority Pollutants |
Other |
| Water Toxicity |
Toxicity (chronic) - Ceriodaphnia, Toxicity (chronic) - Fathead minnow, Toxicity (chronic) - other |
Quarterly |
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Data Products Available
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