code to iterate Document Library for feature

I'm writing a timer job that needs to email document owners when a document column (review Date=today) I want features to be available in sites which I can activate site collection.

How do I ensure that the site where I activate the feature is the site that gets iterated. I've done this in the past but used absolute url's

i.e. SPSite site = webApplication.Sites[http];

Could someone help with method to use and getting a reference for the site where activated and iterating list in that site pls? I found the following pieces of code:

public override void Execute(Guid contentDbId)
 {
 // 1 here }

or

public override void Execute(Guid targetInstanceId)

{
 // 2 here }

Code found to iterate a list https://stackoverflow.com/questions/965695/iterate-a-sharepoint-list

public override void FeatureActivated(SPFeatureReceiverProperties properties)
 {
     using(SPSite site = properties.Feature.Parent as SPSite)
     {
         SPList list = site.RootWeb.Lists["ListName"];
         SPListItemCollection items = list.Items;

        foreach (SPListItem listItem in items)
         {
             Response.Write(SPEncode.HtmlEncode(listItem["Url"].ToString()) +"
");
         }
     }
 }

I also have a feature in the project (can this be used to gather the path of activated site?

 public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {
            SPSite site = properties.Feature.Parent as SPSite;

            // make sure the job isn't already registered

            foreach (SPJobDefinition job in site.WebApplication.JobDefinitions)
            {
                if (job.Name == List_JOB_NAME1)
                    job.Delete();
            }

            // install the job

            ReviewDocument ListTimerJob1 = new ReviewDocument("ReviewDate", site.WebApplication);
}