Get set of Pixels from PolygonCollider2d Position

Hello, This is my first question so I apologize in advance if I break any rules.

I am using the Unity 4.3.4, 2D project.

I'm working on a piece of code that gets triggered when a "Shot" hits a "Mountain". What I want to achieve is the Shot creating a crater in the Mountain. I have a CircleCollider2d on the Shot and a PolygonCollider2d on the Mountain. I am entering when the event occurs with the following code, which is working fine:

 void OnTriggerEnter2D(Collider2D otherCollider)
 {
     //Check if our Shot hit the Mountains
     if (otherCollider.name == "Mountains") 
     {
         deformPixels(otherCollider.gameObject,gameObject.transform.position);
     }
     
     Destroy (gameObject);
 }
 

The problem comes from the deformPixels function. Right now I have the following:

 void deformPixels(GameObject land, Vector3 position)
 {
 
     Vector2 hitPos = new Vector2 (position.x, position.y);
 
     hitPos = convertToLocal(land.transform, hitPos);
 
     //Get the SpriteRenderer on the Mountains
     
     SpriteRenderer sr = land.GetComponent<SpriteRenderer> ();
 
     if (sr != null) 
     {
         //Size of the Texture
         Rect spriteRect = sr.sprite.textureRect;
 
         Vector2 landScale = new Vector2(land.transform.localScale.x,land.transform.localScale.y);
         
         //Adjusted Dims:
         //        dimension of the instantiated sprite?
         //        Get this by multiplying the instantiated Scale and the texture dimensions.?
         //        Not sure if this is correct...
         Vector2 adjustedDims = new Vector2(spriteRect.width * landScale.x,spriteRect.height * landScale.y);
 
         Debug.Log("SpriteRect = " + spriteRect + " Scale = " + landScale + " Adjusted Dims = " + adjustedDims + " HitPos = " + hitPos);
 
         Texture2D tex = sr.sprite.texture;
         
         Vector3 localPos = land.transform.InverseTransformPoint(position);
         Vector2 texturePos = new Vector2(localPos.x, localPos.y);
 
         texturePos.x = texturePos.x * tex.width;
         texturePos.y = texturePos.y * tex.height;
 
         Debug.Log("Texture Pos = " + texturePos);
 
         texturePos.x = texturePos.x / spriteRect.width;
         texturePos.y = texturePos.y / spriteRect.height;
         Debug.Log ("Texture Pos = " + texturePos);
     }
 }
 

The following is list of psuedo steps that I believe need to happen.

 /*
         Psuedo-psuedo:
         
         1. Get location of The shot on the Mountain
         2. Convert that location into texture coordinates of the Mountain
         3. Grab a portion of Pixels from the Mountain Texture based on were the shot lands
         4. Remove a subset of the grabbed pixels
         5. Re-write those pixels to the instantiated sprite
         6. Remove / Re add PolygonCollider2d to update collider
 
 */

I don't believe that I am doing this correct since my Mountain texture is 640X400 and the Scale is X = 3.4, Y = 3.4 Yet I am getting positions of + and - 2000 on the X axis. Which is Double what I would expect (3.4 * 640 / 2 = 1088 in + or - direction).

So far I can get the location of the hit on the mountain. I guess the most immediate thing that needs to happen is getting the location of the hit on the texture, so then I can get the set of pixels on the texture.

I have attached some screen shots: