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1 LMLEEDSNILL HERKENHOFF, INC September 1990 Table 3 also shows that 1,2-dichloroethane (DCA) was detected in the latest sampling of MW6 and MW4 (these compounds were not previously tested for). A trace concentration rof 1,2-dichloropropane was also detected in MW6 in the latest sampling It is highly detected in MW6 in the latest sampling. I1,2-dichloroethane is an organic compound which was used in the manufacturing of tetraethyllead (leaded gasoline). It is also a constituent in varnish and finish removers and metal degreasers The California Department of Health Services (DOHS) has established an MCL (maximum contaminant level) of 0.5 ppb in drinking water supplied to the public 1,2-dichloropropane is used as an antiknocking additive for gasoline, and is also contained in solvents There is no established MCL for this compound It is highly unlikely that the presence of these constituents in the groundwater beneath this site is related to an unauthorized release of these compounds at his particular site because analysis of soil samples collected previously by Balbi & Chang from both TB4, located in the northwest corner of the property and from monitoring wells 1,2, and 3, indicated no detectable concentrations of volatile halogenated hydrocarbons, including DCA and dichloropropane. A copy of the laboratory analysis sheets is included in Appendix D Depth to groundwater measurements have been collected by LH at the project site since July of 1989 Water level data indicate that the groundwater is generally flowing in an easterly direction at a relatively flat gradient varying from 0 2 to 0.5 percent. The most recent data collected on August 15, 1990, has groundwater flowing in approximately a I northeasterly direction. Groundwater contour maps have been developed for the site from the measured groundwater level data and are included in Appendix C of this report 14