cvg,
1) It appears the 2 tests were conducted by different people and hence different gauges were used. Correct? Bear in mind that different gauges can show different pressures. A few psi difference can result in significantly different results. Did each entity witness the other's test...
First, determine the required fire flow for the house(s). Check the local fire code. For example, the Uniform Fire Code requires 1,000 gpm for houses less than 3,600 sqft. A reduction is allowed (subject to the AHJ) for a fire sprinkler system.
Second, AWWA Manual M-31 (Page 21) indicates...