California Code of Regulations
Title 14 - Natural Resources
Division 2 - Department of Conservation
Chapter 4 - Development, Regulation, and Conservation of Oil and Gas Resources
Subchapter 2 - Environmental Protection
Article 2.5 - Health Protection Zones. [Suspended; See Section 1765.11]
Section 1765.2 - Measuring Distances

(a) For the purposes of this article distances shall be measured in feet as horizontal distance.

(b) When distance from a sensitive receptor is measured from the property line, the measurement shall be from the property line directly between the sensitive receptor and the wellhead or production facility and from the point on the property line that is nearest to the wellhead or production facility.

(c) Distances from production facilities may be measured from the geometric center of the location of the production facility, except if precise measurement from the edge of the production facility nearest a sensitive receptor would result in a finding that the production facility is within a Health Protection Zone.

(d) When latitude and longitude coordinates are required under this article, the coordinate shall be provided in decimal degrees with an accuracy of plus or minus ten feet using the geodetic datum North American Datum of 1983 (NAD83).