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MORMON SLOUGH FIGURE 1 SHOWS MORMON SLOUGH IN RELATION TO THE MCCORMICK AND BAXTER PLANT AND THE STOCKTON PORT. UPPER MORMON SLOUGH FLOWS SOME YEARS AGO WERE DIVERTED THROUGH THE STOCKTON DIVERTING CANAL NORTHERLY TO THE CALAVERAS RIVER TO EASE FLOODING CON- DITIONS. THE POINT OF DIVERSION IS ABOUT 7 MILES ABOVE THE MOUTH OF THE SLOUGH. THE DRAINAGE BASIN OF LOWER MORMON SLOUGH IS POORLY DEFINED, BUT IT APPEARS TO CONTAIN 6 TO 8 SQUARE MILES, INCLUDING A LARGE PORTION OF THE CITY OF STOCKTON. FLOW RECORDS ARE NOT AVAILABLE, BUT GENERALLY SPEAKING THERE IS NO SIGNIFICANT NET DOWNSTREAM FLOW EXCEPT DURING RAINY PERIODS. TIDAL ACTION IS THEREFORE THE ONLY SIGNIFICANT WATER MOVEMENT DURING MOST OF THE YEAR. IT IS ESTIMATED THAT 1,00,000 FT OF WATER MOVES IN AND OUT DURING ONE TIDE PHASE, OR ABOUT 2,800,000 FT3 EACH WAY PER DAY. MORMON SLOUGH SUPPORTS A WARM WATER FISHERY INCLUDING CARP, CATFISH, SUNFISH, AND BASS, THE ONLY INDUSTRIAL WATER USE OF MORMON SLOUGH IS BY MCCORMICK AND BAXTER FOR COOLING WATER PURPOSES. WASTE DISCHARGES INTO THE SLOUGH INCLUDE COOLING WATER DISCHARGES BY MCCORMICK AND BAXTER, AND BY FIBREBOARD INTO MCDONALD CANAL, A TRIBUTARY TO MORMON SLOUGH. THE ONLY OTHER DISCHARGES KNOWN ARE STORM WATER DRAINS. THE DEPARTMENT OF WATER RESOURCES IS OF THE OPINION THAT MORMON SLOUGH FEEDS THE UPPER STRATA OF GROUND WATER IN THIS AREA, BEING A TIDAL BODY OF WATER CONNECTING TO THE UPPER END OF THE TURNING BASIN, MORMON SLOUGH AND STOCKTON PORT WATERS ARE THOROUGHLY INTERMINGLED. THEREFORE DELE- TERIOUS MATERIALS IN MORMON SLOUGH WOULD HAVE AN ADVERSE EFFECT ON THE PORT WATERS, AND VICE VERSA. WITHIN THE NEXT FEW YEARS THE WESTSIDE FREEWAY WILL BE CONSTRUCTED THROUGH THIS VICINITY. REPORTEDLY IT WILL PASS THROUGH THE EAST EDGE OF THE MCCORMICK AND BAXTER PROPERTY. MORMON SLOUGH WILL BE FILLED IN FOR THE FREEWAY CROSSING, AND DRAINAGE WILL BE DIVERTED THROUGH A CANAL NORTHERLY TO THE UPPER PORT AREA. WATER QUALITY CONSIDERATIONS TO DETERMINE THE EFFECT OF THE CREOSOTE LOG RAFTS ON WATER QUALITY IN MORMON SLOUGH, SAMPLES WERE TAKEN AT 3 LOCATIONS AT 3 VERTICAL LEVELS (SURFACE, NEAR THE BOTTOM, AND BOTTOM MUD), FOR A TOTAL OF 9 SAMPLES. THE LOCATIONS WERE AT THE MOUTH OF MORMON SLOUGH, AT THE LOG RAFTS, AND ABOUT 100 FEET ABOVE THE LOG RAFTS NEAR THE FAR BANK. WATER QUALITY PARAMETERS ANALYZED WERE PHENOLS, OIL, HEXAVALENT CHROMIUM, ARSENIC, ZINC, AND COPPER. THE RAW DATA FOLLOWS, WITH ALL FIGURES IN MILLIGRAMS PER LITER.