COMPLIANCE INFO_1973-2003 - Laserfiche WebLink

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MEMORANDUM TO: Paul E. Jepperson FROM: William S. Johnson SUBJECT: California Clay Products Company GEOLOGY Attached well logs indicate a heterogeneous distribution of soil types with possible sand and gravel , as described by water well drillers. RECOMMEND - Two or three backhoe excavations to 10 ' - 12 ' depth in area where Group II waste materials will be deposited. Have a competent geologist or county sanitarian determine lithology of pits and also of the 21 ' from surface to invert of Cal Clay since this ipterval will be filled. Run typical M.A. ' s (mechanical analyses) of backhoe material if geologist or sanitarian does not make visual inspection (i .e. , confirm lithology at site) . Obtain test hole logs and data that McCarty mentions for study. Reference ground surface, pit bottom, and ground- water elevation to USGS datum. HYDROLOGY Depth of water at 48' below ground surface (measured by Noack) is reasonable over a larger area. Department of Water Resources wells intercepted water in this range. Rxecliopal_gradient is northeasterl toward Stockton in the Fre :Mpp area. If Cal Clay weil is at nortnena or wes si e ot "p-177tiseful for monitor- ing. Proximity of Walker Slough suggests tight lithology. RECOMMEND - Sample well for necessary constituent testing: (1) for base line conditions , (2) annually in late fall (start of water year) . ENGINEERING RECOMMEND - Grading of site; placement of materials in ap- proved locations if lithology not uniform over area; exclusion of runoff from surface drainage; pit water accumulated in clay-base area for sum- mer evaporation; listing of land uses within 1 ,000 feet to N, E, and water well map. Describe placement and covering of wastes. State intended land use after site has been filled.