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C A M B R i A Mr Jeffrey Wong . February 15, 2006 Well Construction The wells were constructed using 4-mch diameter Schedule 40 PVC casing Wells MW-5 and MW-6 were screened from 60 to 75 fbg and MW-7 was screened from 90 to 95 fbg using 0 010- inch machine slotted screen The wells were completed by placing a filter pack of Monterey #2/12 sand from the bottom of the well casing to approximately 2 feet above the top of the screened casing Approximately 2 feet of bentonite were placed above the filter pack Neat Portland cement was placed in the annular space between the boring wall and the PVC casing from the top of the bentonite seal to approximately I fbg A flush- mounted, traffic-rated well box was installed to protect and finish each well to grade Cambria presents monitoring well construction details in Table 1 and on the boring logs (Attachment D) Department of Water Resources well driller's completion reports are included as Attachment G Well Development/Sampling Blaine gauged and sampled wells MW-1 through MW-4 on December 19, 2005 Blaine developed and purged newly- installed wells MW-5, MW-6, and MW-7 on December 22, 2005 and gauged and sampled the new wells on December 29, 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 C Wellhead Survey Virgil Chavez Land Surveying (licensed land surveyor No 6323) of Vallejo, California surveyed the top of casing elevations for wells MW-5, MW-6, and MW-7 relative to mean sea level and surveyed the wells' longitudes and latitudes on January 25, 2006 The survey report is included as Attachment H Groundwater Flow Direction Cambria evaluated water-level measurement data from December 19, 2005 and prepared a groundwater elevation contour map (Figure 3) Groundwater flow direction is northerly with an approximate hydraulic gradient of 0 003 6