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  • Users: androsnich
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  1. androsnich

    Redwood Septic Tank Repair

    Hello, I am repairing a 4' x 10' septic tank built with 2"x12" rough redwood. I have some concerns about rotting, sealing the tank, and building an accessable cover. All of the top two courses of of 2x12 are rotting; some of the bottom courses also. The floor is in good shape except as noted...
  2. androsnich

    Septic Tank Sludge Disposal

    Hello, How do I get rid of "dry" septic tank sludge? I recently dug out the sludge from an "out of use" septic tank. The sludge is the consistency of moist dirt. It is black, sticky and greasy. I have about 2 cu yds (800 pounds). Can I use it as land fill and put it back in the soil? Do I...
  3. androsnich

    Redwood Septic Tank Repair

    Hello, I am repairing a 4' x 10' septic tank built with 2"x12" rough redwood. I have some concerns about rotting, sealing the tank, and building an accessable cover. All of the top two courses of of 2x12 are rotting; some of the bottom courses also. The floor is in good shape except as noted...
  4. androsnich

    Shortest Distance to Ellipse from Point

    Shortest Distance to Ellipse from Point, Or: What is the Line Perpendicular to the Ellipse? What is a good method to determine the shortest distance from a point to an Ellipse? This is similar to finding the line through a given point that is perpendicular to an ellipse. To make it simple...
  5. androsnich

    Shortest Distance to Ellipse from Point,

    Shortest Distance to Ellipse from Point, Or: What is the Line Perpendicular to the Ellipse? What is a good method to determine the shortest distance from a point to an Ellipse? This is similar to finding the line through a given point that is perpendicular to an ellipse. To make it simple...
  6. androsnich

    Shortest Distance to Ellipse from Point

    Shortest Distance to Ellipse from Point, Or: What is the Line Perpendicular to the Ellipse? What is a good method to determine the shortest distance from a point to an Ellipse? This is similar to finding the line through a given point that is perpendicular to an ellipse. To make it simple...
  7. androsnich

    Non-Linear Least Squares - Curve Fit

    How can I do a simple non linear least squares regression on a few data points inorder to find the inflection point? The data resembles a second order polynomial, a parabola. I have about 3-4 points and need only an approxmate answer. I figure I can do a simple polymonial least squrares...

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