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11 borehole during drilling, (3) eliminates the need for drilling fluids, and (4) allows the well to be completed through the center of the drive casing when drilling is finished. Relatively undisturbed vadose zone soil samples for chemical analysis will be collected at 20 feet in the shallow borings and 20 and 200 feet in the deep borings using a modified California split -spoon sampler fitted with stainless steel rings. These samples will be analyzed as described in Section III.F. The exploratory borings will be logged during drilling by a qualified geologist working under the direct supervision of a registered geolo- gist in accordance with Section 2555(d), Article 5, Subchapter 15, Title 23 of the CAC. Soils will be described according to the Unified Soil Classification System. The log for Boring MW -1 is presented in Appendix A. Similar logs will be completed for the additional bor- ings. Pursuant to California Water Code, Section 13751, logs for all moni- toring wells will be filed with the California Department of Water Resources (DWR) on the appropriate forms. Well construction details for Well MW -I are presented in Appendix A. The proposed well design for the additional wells is generally similar to Well MW -1. Final well construction design details for each of the proposed wells will not be known until the borings have been logged and evaluated. Anticipated casing -slot and filter -pack sizes are based on the soil materials encountered in borings at the site. Anticipated typical construction details for the proposed site wells are presented in Figure 3 and are noted below: • The casing and boring diameters for all ground -water monitoring wells will be 4.5 and 10 inches, respectively. • The casing material will be made of flush -threaded, Sched- ule 40 polyvinyl chloride (PVC). 10 Emcon Associates