ARCHIVED REPORTS XR0006254 - Laserfiche WebLink

Home Browse Search

I SECTION 3 SECOND QUARTER GROUNDWATER SAMPLING RESULTS (MAY 1992) I Groundwater elevations were measured and samples were collected on May 19, 1992 The locations of the three monitoring wells (MW-4, MW-5, and MW-6) are shown in Figure 3-1 After the initial water level measurements were made, the three monitoring wells were purged of a minimum of three casing volumes of water. Samples were collected using clean Teflon bailers, and the sampling ' containers were immediately placed in an ice-filled cooler. When the sampling activities were completed, the samples were delivered with the chain-of-custody form to Anlab Analytical Laboratory in ' Sacramento, California Groundwater samples were analyzed for the following parameters • Benzene, toluene, ethylbenzene and total xylenes (BTEX) using EPA Method 602, C Total petroleum hydrocarbons (TPH) using EPA Method 8015 (Modified), and G Total coliform (monitoring well MW-6 only) using SM 9221 Analytical results for February and May 1992 are presented in ' Table 3-1, and original laboratory data sheets are located in Appendix A The approximate concentrations of TPH in groundwater in the vicinity of the wells are illustrated in Figure 3-2 ' Groundwater elevations for February and May 1992 are shown in Table 3-2 Analytical results and groundwater elevations for ' February 1992 are included in Table 3-1 and Table 3-2 for comparison purposes The chain-of-custody form is presented in Appendix B Geochemical parameters for May 1992 are displayed in Table 3-3. Purge Water Containment and Disposal As mentioned above, the three wells were purged prior to sampling Purge water was contained in drums for eventual disposal Based on the analytical results, the purge water poses no threat and Safeway requests permission to dispose of the water into the sewer system or ' use the water for irrigation purposes ' 3-1