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i2 ANALYTICALRE�fS GROUNDWATER 4445 PERSHING AVENUE, STOCUON CALIFORNIA (Results in parts per million/parts-per-billion) Monitoring Well Date Total Petroleum Aromatic Volatile Organics EDB Total Lead Organic Lead Coliform Total/Fecal Hydrocarbons (ppb) (ppm) (ppm) (MPN/100 mi) Gasoline Benzene Toluene Ethylbenzene Total Xylenes (Ppm) (ppb) (ppb) (ppb) (ppb) MW 1 07/23190 < < < < < «0 01 «1 0 10/09/90 < < < < < «0 01 «1 0 - 01/09/91 < < < < < «0 01 - >16 04/09/91 < < < < < «0 01 - «1 0 – - 07/17/91 < < < < < «0 01 0 005 -- 10/08/91 < < < < < «0 01 «1 0 -- 01/21/92 < < < < < <<001 0030 04/21/92 < < < < < «0 02 -- — – • 07/13/92 < < < < < — MW 2 07/23/90 < < < < < «0 01 «1 0 10/09/90 < < < < < <<001 «1 0 -- 01/09/91 < < < < < «0 01 -- - 16 04/09/91 < < < < < «0 01 «i 0 69 6 9 07/17/91 0 060 < < < < «0 01 «1 0 >23 >23 10/08/91 0 060 < < < < «0 01 0 005 69 6 9 01/21/92 < < < < < «0 01 0 011 -- <3 6 04/21/92 < < < < < «0 02 -- 19 07/13/92 < < < < < -- – <3 8 MW 3 07/23/90 < < < < < «0 01 - 10/09/90 < < < < < «0 01 «1 0 -- 01/09/91 -01/09/91 < < < < < «0 01 51 04/09/91 < < < < < «0 01 -- «1 0 – -- 07/17/91 0 080 < 0 001 < < <<001 «1 0 — 10/08/91 0 150 < < < < <<0 01 0 008 – 01121/92 < < < < < «0 01 0 012 04/21/92 < < < < < «0 02 07/13/92 < < < < < - MW 01/21/92 011 12 < 12 085 «001 0012 04/21/92 < < < < < «0 02 0 005 07/13/92 < < < < < <<0 005 -- NOTES EDB = Ethylene dibromide < = Below Practical Quantitation Reporting L¢mlts per Tri Regional Board Staff Recommendationsfor Preliminary Evaluation and Investigation of underground Tank Sites (August 10 1990)(POL for BTEX -0 005 ppm/0 5 ppb TPH as gasoline and diesel =10 pp m/1 000 ppb) MPN/100 ml Most probable number per 100 milliliters of sample = Not analyzed << = Less than Indicated detection limit/mpn as indicated on laboratory analytical report Aegis Environmental int,