Even if you disagree about the survey, I would appreciate if you could please answer a more technical legal question. Can I or should I refer to some of the cases tried in other courts, such as People vs Goulet, in support of the idea that the survey can be invalidated in court? Or should I just state my argument without referring to other cases?
Well done with the research CaliforniaBear, One thing to keep in mind is that People V. Goulet is 1993 and from I recall the Supr. Court of Ventura (Unbinding). That's normally an issue for a Judge/Commissioner who states that Unsafe Speed is unhindered by the Speed trap laws, As an ins policy you may also want to bring People V. Sullivan with you.
https://law.justia.com/cases/california/court-of-appeal/3d/234/56.html
Read it carefully as it comes with an opinion that shows the Cop's Visual estimation to be included "All-Embracing"
"We believe this all-embracing language pertains not only to a radar reading obtained through maintenance of a speed trap but also to the independent observations of the officer operating the speed trap"
People V. Goulet is secondary and persuasive in court where Sullivans is Primary and Binding (Unless your hearing is in Ventura then People. V. Goulet should work).
If the Survey is valid during your research and the peace officer bring's it to court make sure it meets the definition under CVC627 and the People V. Ellis.
I hope this is helpful to yourself or anyone else.