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ENVIRONMENT, INC. • <br />SUBURBAN BAND AND GRAVEL. CO <br />TEMPORARY SUPPLY PLAN <br />JUNE 1 5, 2001 <br />• PAGE 3 <br />TABLB D, WATER LOST WITH GRAVEL & INDUSTRIAL USES, shows how the amount <br />of water lost with the gravel was calculated as required in CRITERIA item }`7. <br />Gravel production runs year around and the amount of water needed for dust <br />control and concrete batching is included in Column 6 based on an average of <br />8 ac-ft per year. This table assumes that the industrial and 4~ losses are <br />proportional to the production rate. Column {`3 was created by multiplying 8 <br />ac-ft by column f2 to calculate a monthly diversion for these uses. No water <br />is used for reclamation as described in the MLRB Reclamation Permit. The <br />last column is then included in TABLE A. <br />TABLE S, DITCH WATER AVAILABILITY, shows the delivery schedule for the <br />ditch water. There are two months (February & March) where there is adequate <br />precipitation to off set the evaporative loss from the 25 acres lake. Column <br />3 is transferred to Table A Column ~. <br />TAHLB F, BLANEY-GRIDDLE CALCULATIONS FOR GRASS, shows the monthly <br />Blaney-Griddle (B-C) calculations to determine water used by the grass hay as <br />a result of irrigation. TAHLSB F1 and F2 contain baseline numbers needed in <br />the Blaney-Griddle calculation. These calculations are based on using the <br />theory found in "IRRIGATION WATER RESOURCES" TECHNICAL RELEASE ~ 21, a USDA - <br />Soil Conservation Service publication dated September, 1978. This was done <br />to show that the grass uses more water than available from the ditch and <br />would suggest that there may have ben some subirrigation along with <br />supplemental water from wells on the site. <br />TABLB G, HISTORIC EVAPOTRANSPIRATION; takes the Blaney-Griddle numbers <br />and adjusts them taking into account the effective annual precipitation. <br />This is done by adjusted the average annual precipitation by a number found <br />in Table /~7, page 32 of the USDA publication. We assumed there is a 90$ <br />chance of occurrence and the average annual rain fall is 15.46 inches. <br />Rounded to three significant numbers, this factor is 0.625. <br />Tabloa F, F1, F2 i G have not changed from those submitted in an earlier <br />responds and are submitted so all calculation tables are available for easy <br />review. There is adequate water from the Burlington Ditch water rights to <br />offset the losses from the 25.0 acres lake surface. The following data was <br />use to find the numbers we are presenting in the tables. <br />The following data was used when figuring the evaporative losses <br />associated with this operation. This information is reflected in TABLEB A <br />THRU G. <br />1) Maximum water surface area under proposed plan 25.00 acres ±. <br />2) The lake surface evaporation is 41.0 inches/ac/yr. <br />3) The gravel production averages 500,000 tons per year. <br />4) Average rain fall in the area is 15.46 inches. <br />5) Effective rain fall is 70$ of actual average. <br />6) Part of the area mined to date was irrigated grass hay (69.77 ac.). <br />7) Latitude for the Road Runners Rest II Pit is approximately 39°54- <br />'34" north, used in figuring effective daylight. <br />