40TH STREET EAST EDM Array
Number of Bench marks: 4
Number of Surveys to 1993: 6
Date of Initial Survey: 22 October 1978
Date of Latest Survey: 30 July 1991
Trespass Permission: None required, although the array is located on private property.
Directions: From Palmdale, proceed east on Palmdale Blvd. to 40th St. E, turn right and proceed south about two miles to Barrel Spring Road. Turn left. The array spans the San Andreas fault and Barrel Springs Road about 100 m east of the intersection of Barrel Sprin g Road and 40th St. E.
Comments: This is a quadrilateral whose bench marks are Class B rod marks driven to refusal and capped with a stainless steel nipple. Slope lengths were measured with an HP3808A distance meter until 1990 when we used a Wild TC2000 total station distance meter to measure horizontal lengths.
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