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~~ SAN JUAN BASIN <br />I~.~L~1-I <br />D E P A R T M E N T ~~ ~ ~~~ <br />May 4, 1987 <br />John T. Doerfer <br />Mined Land Reclaimation Division <br />1313 Sherman Street <br />Denver, CO 80203 <br />SUBJECT: La Plata Coal Company <br />County Road 120 <br />La Plata County <br /> <br />This letter is written to confirm our conversation regarding the sewage disposal system which will <br />serve the office and the residential trailer located just north of County Road 120. <br />On February 17, 1987, a sewage disposal permit was issued for the conswction of the system. It <br />was amended on April 17, 1987. The system will consist of two concrete septic tanks on the north <br />side of the County Road dischazging to a leach bed on the south side of the County Road. The site <br />for the leach bed was selected because no suitable soil exists north of the County Road. <br />Percolation tests were conducted and an 8 foot deep hole was examined at the leach field site. <br />Two of our big concerns when issuing a permit are that there be no resultant groundwater <br />degradation and that no ponding of sewage occur at the leach field site. The soil examinations <br />revealed a silty loam soil at least 8 feet deep. No evidence of groundwater was revealed and none <br />is expected throughout the seasons. The soil is very suitable as both a biological and physical filter <br />to protect the groundwater. I believe the irrigation ditch (term?) just south of the County Road was <br />running water at the time the soil was examined. <br />In the amended permit, the possible influence of the irrigation ditch on theleach bed was addressed <br />in comments #S and #6. Comment #5, "Maintain 50 foot setback from leach bed to irrigation <br />ditch." Cotnment #6, "Berm uphill side(s) of leach field to divert imgation water." A copy of the <br />permit is enclosed. <br />There is nothing in the conswction of the leach bed to preclude that area form being used for <br />agricultural purposes. It is perfectly acceptable to grow and harvest hay or other crops over the <br />leach bed. <br />Please contact this office if you have any questions or concerns. <br />Robert Woolrich, R. S. <br />Director of Environmental Health <br />RW/lm <br />enc. <br />cc: Ioe Carpio / <br />La Plata County •P.O. Box 140 •La Plata Medical Arrs Building •3803 North Main • Durango, C081301 .303/247-5702 <br />