I lived in Gloucester Point across the York River from Yorktown for 15 years. I lived right on the river and I will tell you that I NEVER smelled the refinery. That are is due north of the refinery. I have many friends that live in Yorktown, Grafton and Seaford and they report that there has never been any issue with the refinery with regard to odors/ You can search the internet for "Amoco refinery" +yorktown and find reports on pollution such as:
"The report summarizes the surface water sampling program at the Amoco Refinery at Yorktown, Virginia.^This was undertaken as a part of the joint project between Amoco Corporation and the United States Environmental Protection Agency to review pollution prevention alternatives at a petroleum refinery.^The surface water data provides a snapshot of surface water pollutant generation and discharge from the refinery.^Different process units contribute to the total wastewater flow of 460 GPM in the refinery.^Water in the ditch system, which is non-process water, is free of organic contamination.^Oil and grease, phenols, ammonia and sulfides are the significant components measured in the process wastewater.^The concentrations of organics in most water streams leaving the individual process units are relatively low, in the 1-5 parts per million (ppm) range.^A few individual streams such as the crude desalter brine and tank water draws have high pollutant loadings.^Concentrations of metals in the refinery wastewater are very low.^The wastewater treatment plant is very effective in reducing the pollutant loading in the water with overall removal efficiencies greater than 99% for most organics and inorganics."
Energy Citations Database (ECD) - - Document #6489656
Overall I think that you will like it there and have no problems.