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11 <br />► Volatile Organics - During the period from 1988 to 1991, 18 groundwater samples were collected. Each sample was analyzed for 33 <br />different volatile organic chemicals (VOCs), a total of 594 measurements (33x18). VOCs were detected 10 times. Four of the ten VOC <br />detects were in the upgradient monitoring well MW -6. _ o4( s,W So„n, ? <br />► Metals - Metals concentrations in the groundwater do not appear to be increasing downgradient of the landfill. Iron, manganese, aluminum <br />and zinc concentrations appear to decrease from upgradient to downgradient wells (SWAT Investigation). Other metal concentrations <br />appear to exist at approximately equal concentrations at upgradient and downgradient wells. <br />► Inorganics - Sulfate and total dissolved solids appear to be higher in downgradient wells relative to upgradient wells. For TDS, the increase <br />is small, on the average of 200 ppm. There are two factors that mitigate this potential impact. <br />1. Walker Slough may be significantly influencing the data collected from the upgradient monitoring wells MW -5 and MW -6. It appears <br />that waters infiltrating from the slough are affecting MW -5 and MW -6 biasing the comparisons with downgradient wells. This is <br />supported by Still analyses. <br />2. Water quality in the immediate vicinity of the Cove site has elevated levels of TDS attributed to saltwater intrusion (1989 San Joaquin <br />County Semi -Annual Ground Water Monitoring Report). Data from this report and from Kleinfelder files for a site close the Cove <br />Landfill is summarized in the following table. J -M Manufacturing is one mile south (upgradient) of Cove, San Joaquin County General <br />Hospital is approximately 1.9 miles south of Cove, and Van Bushkirk Park is 1.1 miles west of Cove. <br />KLEINFELDER <br />