Things you need to know before you use the NAVAIR site data:

• Phase II consisted of eight shovel test pits and six 5-x-5 foot units plotted on a grid oriented with magnetic north. The shovel test pits are radials around positive pits from the Phase I survey. The Phase II STPs are identified like Phase I radials, e.g. "C26N20." Units were dug stratigraphically and divided into natural levels, so contexts are identified by unit number followed by level, e.g. "U3L1." Note: Units 1 through 6 from Phase II are delineated from Units 1 through 6 from Phase III in this way because units were not dug stratigraphically during Phase III and are simply identified by unit number (no level), e.g. "01" represents Unit 1 from Phase III.
• Phase III involved excavation of 93 shovel test pits and 43 5-x-5 foot units within the defined site boundary (orange dotted line on site map). In the DAACS database and site maps, all phases are tied in to the same grid, with a datum of "0,0" at the southwest corner of the brick feature, Feature 01. This is the same datum used in Phase II and Phase III of the project.
• Twenty features were initially identified during excavation but after further examination in the field, eleven of the features were determined to be rodent burrows and hence not recorded as features. Nine features are recorded in the DAACS database. Since the feature numbers used in the database are the same as those assigned in the field, there are number gaps. Selected features were bisected and excavated in natural levels. All feature sediment was screened through ¼-inch mesh. Additionally, one-liter samples were removed from each feature and water-screened through fine mesh for faunal and botanical recovery.