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Mountain House Storm Water Detention Basin Page 5 <br /> WKA No. 6504.05 <br /> ' October 7, 2005 <br /> ' 4.2.3 Monitoring Well Survey <br /> ' The horizontal coordinates of the newly installed wells and the top of well casing elevations and <br /> ground surface elevations were surveyed to the nearest 0.001 foot with respect to mean sea level <br /> (msl)by MacKay & Somps, a licensed California surveyor, on September 20, 2005. Survey data <br /> is included on Table 2. <br /> t5.0 RESULTS OF INVESTIGATION <br /> ' The following presents the findings of the groundwater investigation including soils encountered, <br /> groundwater depths, groundwater flow direction, groundwater gradient, and analytical data. <br /> 5.1 Site Subsurface Soil Conditions <br /> ' Based on observations made during drilling and soil sampling, the geologic materials <br /> encountered consist of fine-grained sediments. The fine-grained sediments were predominantly <br /> hard, olive-brown to tan, clay to clayey silts with occasional thin, brown, silty sand interbeds. <br /> Logs for each boring are included in Appendix B. <br /> 5.2 Site Groundwater Conditions <br /> ' Groundwater was encountered in two of the four borings. Groundwater was first encountered in <br /> boring MW4, drilled first, at 59 feet bgs and in boring MW 1 at 25 feet bgs. No groundwater was <br /> observed during drilling of boring MW2 or MW3. It was observed during and subsequent to <br /> well construction that the water levels in each well, including MW2 and MW3, rose from initial <br /> levels due to formation recharge. Following well construction and within 48 hours of drilling, <br /> ' depth-to-water measurements were obtained for each well. The depth-to-groundwater at the site <br /> as measured in the shallow monitoring wells (MW 1, MW2, MW3) ranged from 12.24 feet bgs to <br /> 16.20 feet bgs. Groundwater elevations at the site based on the depth-to-water measurements in <br /> WALLACE-KUHL <br /> Nene/en,cyv &ASSOCIATES INC. <br />