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RON � J[ ff •pAP 120 W.]Cattlemen Lane.Wdtl,CalnaNa 3,0 QUARTERLY MONITORING RESULTS 3.1 Ground�rater level Measurement ' Monthly water level measurements obtained in February, March, and April 1991 are summarized in Table 1. Each measurement was made from the top of the well casing with a Seattle Slope Indicator and referenced to sea level. Groundwater gradient and flow direction for the subject site were established based upon the groundwater elevations derived from the field measurements. The groundwater flow direction occurs in a ndwater table contour maps south/southeasterly direction as shown on the grou (Figures 3, 4 and 5). Figure 6 is a hydrograph depicting elevation changes in groundwater from January through April 1991. The groundwater gradient was measured at an average of o.0018 feet/foot. Refer to Aegis' Standard Operating Procedure Number 12 (SOP-12), in Appendix B, for protocol relating to field measurements. ° 3.2 Groundwater Sam le Collectlnn and Laboratory Anal sis Groundwater samples were collected on April 22, 1991. The three monitoring wells were d according to the Aegis'SOP-7 included in the purged and groundwater samples coAecte appendices. The field data sheets are included in Appendix C. The water samples from each well were collected in 40-m1 VCA vials and ane-liter glass-amber bottles. The samples were immediately placed on ice in a cooler and delivered under chain-of-custody to Coast-to-Coast Analytical Services (CCAS) in San Luis Obispo, California. The water samples for MW-1, 2, and 3 were analyzed for fuel fingerprint which benzene, a) total purgeable petroleum hydrocarbons as gasoline (TPPH-G); ) ethylbenzene, toluene, and total xylenes (BTEX); c) 1,2-Dibromoethane (EDB); d) 1,2- Dichloruethane (EDC); and e)total lead. The laboratory analyses is as follows: the Fuel Fingerprint Analysis by extraction with EPA Method 5030 (purge g and trap) and analyzed by CAL DHS DRAFT TPH (modified) and I=PA Method 8260 (GC/MS)for constituents a) PA Method 7421. Laboratory results are through d) listed above and total lead by f attachments a d the reports and chain-of-custody forms are summarized in Table 2 0 located in Appendix A. Furthermore, a groundwater sample from MW-2 was analyzed for Total and Fecal Coliform. This sample was collected on April 22, 1991 and Hent under chain-of-custody _ to Eureka Laboratories, Inc. in Sacramento, California to perform the analysis by the k Colilert Method. Associated test results are presented in Table 2. Refer to the attached protocol on sample identification and chain-of SCl's 4, 5 and 7, in Appendix B for rance and control and groundwater purging and custody,laboratory analytical quality assu —---- --- -- -- - --- ---- -- sampling.-- - eS-013C.Rar