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r 1; rV j e File No.2070-2 19 December 1991 Page B 3.4 Groun$watcx Analytical Labkatory Results Groundwater samples obtained from the Ra,nbo Baikery wells were analyzed for the presence of total petroleum hydrocarbons (TPH), aromatic volatile organics (AVQ's) and lead is per recommendations in the Tri-Regional guidelines published by the Regional Water Quality Control Board. Tab!. 11 summarizes the laboratory results fL;, the groundwater samples obtained at the subject property. Figure 10 illustrates the locations where the groundwater samples were obtained and tl Jr corresponding contaminant concerts ations, Copies of the analytical laboratory .results for tbo groundwater samples Pxe includad as Appendix IX. i; Groundwater Sample Analyses Date Ethyl am Ig Same TPH Renzen Toluene nz n Xylenes UPI MW-1 7110187 78 6,800 ,17,000 ND 4,100 ND MW-1 4126188 NS 2,300 9,000 970 8,000 NS MW-1 3119/90 17.3 5,120 13,000 1,380 10,500 ND IMW-1 12/20/90 9.5 7,100 17,500 1,800 14,200 ND* PAV-2 918187 ND ND ND ND ND 0.OS MW-2 3119190 ND ND ND ND ND NA. MW-3 9/8187 ND ND ND ND ND 0,i0 MW-3 3119190 ND ND ND ND ND ND MW-3 12/20/90 ND ND ND ND ND ND* MW-4 215188 1.2 75 85 14D 130 ND . MVI-4 4126188 NS 19 21 ND 31 NS MW-4 3119190 ND ND ND ND ND ND MW-5 2.'518$ ND ND 0.6 ND ND ND Y MW-5 412618$ NS ND 0.70 ND ND NS MW-5 3129/90 ND ND ND ND ND NS MW-6 3/19/90 ND ND ND ND ND ND MW-S 12/20/90 ND ND ND ND ND ND* MW-7 3119190 0.2 21.8 4.1 1.9 6.6 ND - MW-7 5124190 3.3 55.8 16.7 10.7 9.3 ND MW-8 It 116190 0.4 ND ND ND ND ND* 'rIW-8 12120,'90 ND ND ND ND ND ND* ^' MS: Not sampled. NL)- None detected, TPH: Total pareteum hydrocarbons (Method GC•FID). Results am reportd In para per minion. BTEat: Benzene, toluena, ethyl benzene and total xylenes(EFA Method 6172). Results arc reported in parU per billion. lead: Ortartc lead (Method DOHS). ReaulLa are repined In parts per million. - •: Lead analyzed via EPA Method 200.7 for total lead,as per RWQCS Drinan$Water Standards, Results .aro reported In pans per million. i r ANVERSON - 1 1 GROUP ROUP ;