Line A is orthogonal to Line B, so that the NW end of Line A
joins the SW end of Line B. Line A is roughly aligned across the
presumed electrical strike of the formations and Line B is roughly
parallel to the strike. Data from existing wells and some vertical
electrical soundings (VES) completed in the area were used to
constrain the geoelectrical model.
A test hole was completed at the proposed well location, and
pre-drilling interpretation of the profile (image) compares
favorably with the results. The base of the saturated younger and
older alluvium was found at about the 150-foot depth. Clay and sand
of the Paso Robles Formation were logged to a depth of 200-250
feet. Below 250 feet decreasing sand and increasing amounts of
siltstone (material of low electrical resistivity) were noted to the
total depth explored (about 300 feet) in the test hole.
The test hole was not carried deeper because the Stratagem profile
shows that only materials of relatively low resistivity (either
siltstone or materials having poor quality water) are present to at
least 600 feet.
