Groundwater Chemicals Desk Reference
John H. Montgomery
CRC Press
This is a great text full of useful information on over 400 chemicals.  The text offers information  on melting point, density, Henry's law constant,  soil sorption coefficient, octanol/water partition coefficient, solubility in organics and water, vapor density and pressure.  The text includes a section on each chemical discussing environmental fate, toxicity, drinking water standard and use of each chemical.  I've found this book very helpful over the last 10 years.