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AMBRIA Groundwater Sampling Groundwater sampling was attempted in coarse grain soils located in the approximate depth ranges of 48-55 fbg, 75-80 fbg, and 87-95 fbg in borings SB-5 through SB-9 Groundwater samples from the 48-55 fbg depth range were not collected from borings SB-7 and S13-9 because the formation did not yield sufficient water for sample collection Well Materials Wells MW-6 through MW-9 were constructed using two-inch diameter, Schedule 40 PVC casing with a screen slot size of i 0 020-inch and#2/12 Monterey sand Screened Interval: Wells MW-6 through MW-9 are screened from 38 to 53 fbg Monitoring well construction details are presented on Table 1 and recorded on the exploratory boring logs (Appendix B) Well Development/Sampling Blaine developed and purged wells MW-6 through MW-9 on January 5, 2005 and sampled wells (MW-1 through MW-8) on • January 11, 2005 Well MW-9 was sampled on January 24, 2005 Blaine developed the wells using surge block agitation and pump evacuation Blaine's groundwater monitoring and well development report, which includes field sheets, is presented as Appendix E Wellhead Survey• Virgil Chavez Land Surveying (licensed land surveyor No 6323) of Vallejo, California surveyed the top of casing elevations for wells MW-6 through MW-9 relative to mean sea level and surveyed the well's latitude and longitude on January 13, 2005 (Appendix F) Groundwater Depths: During drilling activities, groundwater was observed in borings MW-6 through MW-9 at a depth of approximately 47 fbg Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater in wells MW-1 through MW-8 at depths ranging from 43 50 to 45 10 fbg on January 11, 2005 and 43 30 fbg in well MW-9 on January 24, 2005 Blaine's well gauging data is included in Appendix E • 1511 4