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Adk <br /> KLEINFELDER <br /> File No. 20-3978-01.W10 <br /> July 26, 1997 <br /> Barium concentrations exceed the MCL in monitoring wells MW-1 and MW-2 <br /> (downgradient from the lime ponds). Both concentrations , 1.4 mg/L and 1.0 mg/L <br /> respectively, only slightly exceed the MCL of 1.0 mg/L. The source of the barium is <br /> unknown. However, it should be noted that barium concentrations in the off-site <br /> upgradient monitoring well (MW-5) have exceeded the MCL for barium during past <br /> monitoring events associated with the ponds. <br /> 4. The concentrations of bicarbonate alkalinity, boron, calcium, magnesium, potassium <br /> and sodium appear to indicate a "hard water" condition to be present in the samples <br /> obtained. This condition is evident in all of the samples. The highest concentrations <br /> present appear to be located adjacent to the lime ponds. However, hard water was <br /> also present in the up-gradient off-site well. No MCLs or SMCLs are listed for any <br /> of these analytes in 22CCR§64431 or 22CCR§64449.1, respectively. <br /> 5. Slightly elevated chloride concentrations existed on site. Water samples obtained <br /> from Monitoring Wells 1, 2 and 4 exceed the recommended SMCL as expressed in <br /> 22CCR§64449.1. However, none of the concentrations exceed the upper SMCL for <br /> chloride as expressed in 22CCR§64449.1. <br /> 6. Specific Conductance (EC) in the groundwater samples obtained exceeded the <br /> recommended SMCL(900 µmhos/cm) as expressed in 22CCR§64449.1 in all but the <br /> samples obtained from the "Cattle Pen Well" and Production Well 8. That includes <br /> the off-site upgradient well MW-5. Additionally, water samples obtained from <br /> Production Well 5 and Monitoring Wells 1 through 4 exceeded the upper SMCL of <br /> 1600 µmhos/cm. Total Dissolved Solids (TDS) in groundwater were high in all but <br /> one of the samples obtained(Cattle Pen Well). The recommended SMCL for TDS in <br /> groundwater is 500 mg/L (22CCR§64449.1). All the water samples obtained with <br /> exception of the Cattle Pen Well and Production Well 8 exceeded that concentration. <br /> Additionally, water samples obtained from Monitoring Wells 1 through 4, exceeded <br /> the upper SMCL of 1000 mg/L. However, please note that the hard water exhibited <br /> by said concentrations are common to many areas of the San Joaquin Valley <br /> (particularly the western portions). <br /> 20-3978-OI.WI0/2017LI55 Page 18 of 50 Copyright 1997,Kleinfelder,Inc. <br />