COMPLIANCE INFO_1992 - Laserfiche WebLink

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KLEINFELDE R ................ ............. ... . .. .................. X . . ........................... .... ------ . ........ ------------ ..... . . ....................... .. .. ...... .. .. ...... .................................... .......... ..................................... ... ............................... W .. ............ .. ...... . ................ . ............ Chromium VI .042 - .05 .05# Selenium .012 0.01 Primary MCL for Total Chromium MW-1 is upgradient of the identified landfill zones and therefore, it appears that the observed concentrations may be background for the site. Selenium was not detected in the downgradient wells. Hexavalent chromium was detected in one downgradient well, MW-4, at concentrations of.03 to .039 mg/l. Of the 11 metals..consistently detected in ground water at the site, only one was reported at concentrations exceeding the established second= MCL. This metal, manganese, was reported at concentrations ranging from non-detect (detection limit equals .01 mg/1) in MW-4 to 0.12 mg/l in MW-3. The secondary MCL for manganese, which is largely based on objectionable taste.or odor rather than health criteria, is .05 mg/l. It is common for shallow ground water in the San Joaquin valley to .contain manganese at concentrations exceeding 05 mg/l. The analytical results are summarized on Table 5-7. 5.3.2.3 General Minerals Ground water samples were analyzed for major cations (calcium, sodium, potassium, magnesium, and iron) and anions (bicarbonate, carbonate, chloride, sulfate, and nitrate) during the summer of 1989 and the winter of 1990. The results of these analyses are presented on Table 5-8. To assess the relative abundance of major ions and anions, the analytical results were converted from mg/l to meq/1. The relative percentages were then graphed on Stiff diagrams (see 1990 SWAT). From this information, it appears that the cations in ground water at the site are fairly consistent across the facility. However, the anions present in the ground water CR14-92-12 Page 18 of 39 24-220109-1709 Copyright 1992 Kleipfelder, Inc.