Thanks very much Raaj,
In this fake dataset, I would want a user to be able to see a legend where they can select a constituent, say Benzene, and then select a date, say 2019 and the map would show the point for well ID's 1, 2, and 3 and then the values for Benzene for selected date.
Alternatively, the user could select a Well ID, say 2, and select a constituent, say Lead, and the map would display the Lead values for Well 2 in 2019 and 2020.