The range for specific gravity in a normal urine specimen is greater-than-or-equal-to 1.003. The range of creantinine in a normal urine specimen is greater-than-or-equal-to 20mg/dl. If BOTH the specific gravity and the creatinine levels fall below the normal range, the specimen is considered dilute.
However, the statistics from 1950 to 2008 (68 years) show nothing but appreciation. The vineyard that was worth $1,000 an acre in 1950 will be worth $1 million an acre after 100 years, in 2050. Back in 1950, an acre of producing vineyard land in Napa County could be purchased for an average of $1,000 per acre. In 2013, and even after a disastrous economic crash, Napa County an acre of producing vineyard land was selling at around $200,000 per acre.
According to recent TTB updates there are over 880 winery permits within Napa County ranging from the large tourist type wineries to the smaller family and really small boutique wineries to those not open to the public. Some have physical winery facilities, many do not and custom crush.