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• Cumulative Table of Welpata and Analytical Results ADDITIONAL ANALYSES Analyhcal values are in parts per billion(ppb) DATE Notes 2.4- 2- 4- Nap Phenol Ca Cr Pb Ni Zn EPA Meth Eth t-But MTBE DIPS ETBE TAME Dim MnPht MnPht 8260 (EPA 8260) MW-1 05/24/96 -- - - - <10 <10 <100 <50 13 — - -- -- -- - 08/20/96 -- <10 <10 <100 <50 53 -- - - -- -- - 11/05/96 -- — <10 <10 <100 <50 22 -- - - -- - -- 01/07/97 -- - - <10 <10 <100 <60 79 — — -- -- - — 02/07/97 -- 20 21 15 20 30 <10 <10 <100 <50 <10 - - - - - I 05/21/97 -- <5 0 <5 0 <5 0 <50 <50 <10 10 <100 <50 31 - - - - 08/27/97 -- <5 0 4 0 <5 0 <5 0 <50 <10 <10 <100 <50 24 <2 0-6 0 <1000 <500 <100 <2 0 <20 <20 <2 0 11/24/97 -- <5 0 <50 <50 <5 0 <50 <10 <10 <50 <50 74 <500 <100 <20 <20 <2 0 <20 02/12/98 -- <50 <5 0 <5 0 <5 0 <50 <10 <10 <100 <50 90 - - I MW-2 08/27/97 - - - - - - <2 0-<5 0 <1000 <500 <100 <20 <20 <20 <2 0 11/24/97 -- - - -- -- - <500 <100 ©3 c2 0 <2 0 <20 MW-3 08/27/97 -- -- — - - — <2 0-<5 0 <1000 <500 <100 130 <2 0 <20 <2 0 11/24/97 -- - - — -- — - -- -- — <1200 <250 290 <5 0 <50 <5 0 MW-4 08/27/97 -- - - - - -' -- .. - <2 0-4 0 <1000 <500 <100 <20 50 <2 0 11/24/97 -- - - - - - -' -- - - -- -- <600 <100 24 <2 0 28 <2 0 Note Blaine Tech Services,Inc began routine monitoring of the groundwater wells at this site on May 24, 1996 Wellhead survey performed by Ron Archer,Civil Engineer Inc ABBRESVIATIONS- TPH-Total Petroleum Hydrocarbons 4-MnPht-4 Methyiphenol Cr-Chromium Meth-Methanol 2-MnPht-2-Methylphenol MTBE-Methyl t butyl ether 2,4-Dim-2,4-Dimethylphenol Pb-Lead Eth-Ethanol TAME=t-Amyl Methyl Ether TOG-Total Oil&Grease DIPE=DI-isopropyl Ether Ni-Nickel t But-t Butanol Ca-Cadmium Nap-Napthaiene ETBE=Ethyl t-Butyl Ether Zn-Zinc Blaine Tech Services,Inc 980212 C-2 1st-0 1998 Monitonng at Chevron 941264 3775 Tracy Btvd,Tracy,CA 3