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from the movement of heavy vehicles across the site. There is the pos- sibility for removal of surface artifacts by people working at the site. Mitigation Measures. The site needs to be formally tested to determine whether or not an intact subsurface deposit is present. Given the intensity of man-made alterations both in the realignment of Weber Slough and the disturbance of the soils around it, the source of the archaeological evidence is not clear and needs to be resolved. The possibility for flood deposition of artifacts versus that of at least one on-site intact house floor (as suggested by the burnt daub) should be explored. Were the latter encountered, rip-plowing and field-leveling may or may not have obliterated further evidence. Site testing should include the creation of a site map, the collection of surface artifacts and excavation of test pits in the vicinity of the burnt daub concentra- tion to see if an intact house or other artifacts are present. Appropri- ate mitigation measures should also be identified as part of this site analysis. If testing reveals that an intact house floor or other cultural features are present, the site would be rendered an "important archaeological resource" according to the California Environmental Qual- ity Act, Appendix K. Mitigation measures would then be required. These might consist of archaeological site avoidance, the placement of a protective earthen cap, or data recovery, depending on the flexibility of the project's construction schedule, design and use. Data recovery would entail further site excavation to acquire an adequate representation of its content. The non-systematic surveying due to the lack of visibility within ' the cultivated area made it impossible to judge whether or not cultural resources are present. There are two ways to respond to this issue: 1) clear the land to be modified by construction and survey it for cultural resources; or 2) require the presence of a professional archaeologist to monitor these areas during the building period. Should any cultural resources be found, construction would have to be temporarily halted and the resources evaluated. If the resources prove to be significant, impacts would have to be mitigated through avoidance, capping or data 3-53 I01-39.R4 4/10/89