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File No 2070-2 <br /> 17 February 1993 <br /> Page 2 <br /> 0 <br /> Following completion of the well purging, the wells were allowed to recharge prior to sampling <br /> Upon adequate recharge, each of the wells was sampled via a sterile, discrete, disposable bailer The <br /> groundwater samples were placed in sterile containers, stored on ice and transported to Eureka <br /> Laboratories, Inc, a State of California certified analytical laboratory. Laboratory analyses were <br /> conducted for the following parameters. <br /> • total petroleum hydrocarbons (method 8015 modified), <br /> • aromatic volatile organics (EPA method 602), <br /> • total lead (EPA method 6010). <br /> Field Data and Site Determinations <br /> The site-specific groundwater gradient for the final quarter of 1992 could not be determined due to <br /> insufficient data However, based on the two groundwater elevations obtained, it appears that the <br /> groundwater gradient slopes toward the east, consistent with past groundwater gradient calculations. <br /> While obtaining the groundwater samples, particular attention was paid to whether any noticeable <br /> petroleum hydrocarbon odor, discoloration or floating product was evident in the wells The <br /> following was noted during our sampling <br /> • The groundwater sample collected from monitoring well MW-1 had a strong <br /> petroleum hydrocarbon odor. The water was slightly discolored gray No floating <br /> product was noted <br /> • The groundwater sample collected from monitoring well MW-8 had no noticeable <br /> odor, discoloration or floating product <br /> Groundwater Sample Results <br /> Two groundwater samples were submitted to Eureka Laboratories, Inc , a State of California certified <br /> analytical laboratory, for analysis for petroleum hydrocarbon constituents. Table II summarizes the <br /> results of the laboratory analyses Figure 2 illustrates the locations of the monitoring wells and their <br /> corresponding contaminant concentrations A copy of the laboratory results is included in Appendix <br /> I <br /> Disposition of Purged Well Water <br /> Groundwater purged from the monitoring wells was containerized in a 55-gallon drum and stored on <br /> the site Following receipt of the analytical data, Ramos Environmental Services of West Sacramento <br /> collected and disposed of the drummed water on 22 January 1993 as a RCRA hazardous waste liquid <br /> under Uniform Hazardous Waste Manifest number 92508806 <br /> ANDERSON <br /> CONSULTING <br /> GROUP <br /> uJ <br />