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t <br /> V <br /> ). H. KLEINFELDER & ASSOCIATES <br /> File: W-2019-1 <br /> April 16, 1986 <br /> Page 6 <br /> B. Water Analysis <br /> Equal amount by volume of water samples from each well <br /> were combined by the analytical laboratory. The composited <br /> sample was tested for EPA 608, EPA 624 and EPA 625 organics, <br /> 2 , 4-D, 2 , 4, 5-TP, and metals. Analytical results of water <br /> testing were either non-detected within the limits of the <br /> test method or within state recommended levels. <br /> Results of laboratory analysis and chain-of-custody are <br /> included at the end of this report . <br /> VII. DISCUSSION <br /> A. Regional Geologic Conditions <br /> Stockton is located near the center of the Great Central <br /> Valley of California. This valley has been formed by the <br /> filling of a large structural trough or downwarp in the <br /> bedrock formations. The trough is situated between the <br /> Sierra Nevada Mountains on the east and the Coast Range <br /> Mountains on the west. Both -of these mountain ranges were <br /> formed by uplifts which occured primarily during the _Jurassic <br /> and Cretaceous periods. The sediments which .fill the trough <br /> originated as erosional debris from the adjacent <br /> g � mountains <br /> and foothills. The bedrock complex is composed of <br /> metamorphosed marine sediments similar to those found in the <br /> foothills of the western Sierra Nevada and the eastern Coast <br /> Range Mountains. The overlying sediments exhibit a fairly <br />