Urine culture showed 10,000 to 40,000 alpha hemolytic streptococcus species are organisms found in normal skin flora. what does this mean?

The statement means they feel the sample contains contaminants from the skin surface introduced during the collection process, not germs indicating a bladder infection.

In the absence of symptoms it is probably from contamination. If symptomatic a repeat culture of mid-stream, clean catch urine after cleaning the meatal area is needed and empirical treatment started by the Urologist.