At the posted coordinates you will find an informative sign that describes the salt marsh you will be looking. Collect the needed information from the sign, then plug in the numbers to get the coordinates using the below formula:
North 41° 42.LMN West 071° 17.OPQ
The number of letters in the fifth word of the second sentence on the sign = L. This sentence ends with the words “other wildlife.”
Culverts under the bike path allow better flow of the tide in and out of the upper portion of the marsh. The number of culverts mentioned in this caption MINUS ONE = M.
The number of letters in the last word of the caption for marsh plants = N. This caption begins with the words “Following restorarion.”
The third digit in the year The Warren Land Conservation Trust, in partnership with Save The Bay and the USDA Natural Resources Conservation, performed extensive work to the marsh = O.
The number of letters in the second word of the first sentence on the sign = P. This sentence ends with the words “productive habitats.”
The first digit in the year The Warren Land Conservation Trust, in partnership with Save The Bay and the USDA Natural Resources Conservation, performed extensive work to the marsh = Q.
The cache you seek is a small, clear vile that holds only a log, so you will need a writing utensil. The log may be a bit difficult to retrieve, so tweezers may be useful as well. It is important that you
replace the cache as found! The EBBP is very busy, so the cache must remain well hidden. Consult the hint for a hopefully easy find and watch for poison ivy too it seems to be sprouting up everywhere this year. Hope you enjoy!

If you need to, you can check your coordinates here: GeoChecker.com.