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v-� <br /> «. R L A s Y OG OLOC C ASSESSMENT-REPORT <br /> 1999 Etat Yosemite Avenue,Msnteca,Califam" <br /> Deita Project No.4o-88-480 <br /> Page 10 <br /> Hydraulic conductivity values range from 0.417 ft/day at MW-3 to a high of 0.742 ft/day at MW-1. The <br /> — average rate of ground water movement at the site can be calculated from the following formula (Freeze <br /> and Cherry, 1979). <br /> V — K1 <br /> n <br /> w Where: V = Average linear vcIocity. <br /> K = Hydraulic conductivity. <br /> I = Hydraulic gradient. <br /> n = Effective porosity. <br /> At the site: V = (1.34 ft/day) (O.U01) <br /> 0.30 <br /> V = 0.0045 ft/day = 1.63 ft/year <br /> NOTE: n- Estimated. <br /> Ths average linear velocity M is expected to pPrivdically shift with hydraulic gradient changes related <br /> to seasonal ground water level fluctuations. <br /> 3. Soil Chemical Analytical Results <br /> On April 27,1984,two soil borings were advanced to depths of 35 and 36 feet,respectively. Soil samples <br /> were collected at 5-foot intervals ar,d screened with a photoionization detector(PID). Table 7 shows PID <br /> readings. Samples selected for laboratory analysis were based on PID readings and field observations. <br /> Samp?es were analyzed using EPA Method 8260 for BTEX,EDC,EDB,and TPH. Laboratory analysis <br /> sheets are presented in Appendix E. Results of soil analysis are summarized in Table 1. One soil sample <br /> was taken from MW-2 at 20 feet. No petroleum hydrocarbon constituents were found in this sample. <br /> Two samples were taken from MW-3, one at 15 feet which had 0.1 ppm benzene and 60 ppm TPH and <br /> the other at 20 feet,which showed no detectable Ievels of hydrocarbon constituents. <br /> 1 <br /> 4an <br />