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Brea is Map 106 but includes northern parts of Placentia
Map106
Yorba Linda is Map 107 and includes small east parts of Placentia.
Map107
Placentia is Map 108 is the main map for Placentia.
Map108
Map Source: http://www.conservation.ca.gov/dog/maps/Pages/d1_index_map1.aspx
I also know that there is some type of oil pipeline that runs under either Cobb or Gehrig Streets. We had a seepage there back in the 80’s (oil coming up out of the asphalt) but we could not determine who’s it was or where it was going or coming from. There was probably an old oil field in the area before the homes were built.
From private e-mail received April 9, 2018.