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Woodward-Clyde Ca rSEIIIIISIf <br /> Table 2. As shown, the general direction of groundwater flow across the site is toward <br /> the west with a measured horizontal gradient of lit/125ft or 0.008. <br /> 2.6 r <br /> Assuming that the groundwater gradient is 0.008, and that it migrates through a fine <br /> grain sand that occurs at a depth of 55 to at least 70 feet with a hydraulic conductivity <br /> (K) of 2.5 m/day and porosity (n) of 0.125 to 0.25 (from Todd 1980), then by the <br /> relation: <br /> V=Kiln <br /> where <br /> V = groundwater velocity (mlday) <br /> K = hydraulic conductivity of aquifer (m/day) <br /> J groundwater gradient (ft/ft) <br /> n = effective porosity <br /> the rate of migration of groundwater contaminants across the site ranges from 0.16 to <br /> 0.08 to mlday. <br /> f��Lr 2.7 Sr <br /> Water sample- were collected from monitoring wells MW-5 through MW-9 in May of <br /> 1990. WCC's water sample logs are included in Appendix B. Prior to sampling the wells <br /> were purged of about 3 weii volumes and subsequently sampled with a clear plastic <br /> bailer for product layer and sheen. No product layer or sheen was observed on any <br /> samples. Groundwater samples were then collected with a clean Teflon bailer. The <br /> sampies were immediately placed in 40-milliliter capacity VOA vials, sealed and stored <br /> in a refrigerated container for transport to NET analytical laboratory in Santa Rosa, <br /> California along with a Chain-of Custody form, a copy of which is included in Appendix B. <br /> { <br /> S <br /> V <br /> 7 1f <br />