ARCHIVED REPORTS XR0008941 - Laserfiche WebLink

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Mr Jeffrey Wong C A M B R I A February 23, 2006 in Manteca, California for disposal as non-hazardous waste Disposal confirmation for the soil is included as Attachment F Well Construction Monitoring wells MW-12, MW-13, and MW-14 were constructed using 4-inch Schedule 40 PVC casing with 0 020- inch slotted screen Well MW-15 was constructed using 4-inch Schedule 80 PVC casing with 0 020-inch slotted screen Well MW-12 is screened from 50 to 65 fbg, MW-13 is screened from 48 to 63 fbg, MW-14 is screened from 49 to 64 fbg, and MW-15 is screened from 90 to 100 fbg The wells were completed by placing a filter pack of Monterey #2/12 sand (Monterey #3 sand was used in MW-15) 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 1 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 I and on the boring logs (Attachment D) Department of Water Resources well dnller's completion reports are included as Attachment G Wellhead Survey Virgil Chavez Land Surveying (licensed land surveyor No 6323) of Vallejo, California surveyed the top of casing elevations for the wells MW-12 through MW-15 relative to mean sea level and surveyed the wells' longitudes and latitudes on December 14, 2005 The survey report is included as Attachment H FOURTH QUARTER 2005 GROUNDWATER MONITORING AND REMEDIATION ACTIVITIES Well Development and Sampling Blaine developed and purged wells MW-12 through MW-15 on December 21, 2005, and gauged and sampled all site wells except MW-10 on December 29, 1005 Well MW-10 was inaccessible Blaine developed the wells using surge i