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Table 1 Groundwater Monitoring Data and Analytical Results Former Texaco Service Station#309075 3978 South Highway 99 Stockton,California EXPLANATIONS: TOC=Top of Casing MO=Motor Oil X=Xylenes (ft.)=Feet DRO=Diesel Range Organics MTBE=Methyl Tertiary Butyl Ether DTW=Depth to Water GRO=Gasoline Range Organics (gg/L)=Micrograms per liter GWE=Groundwater Elevation B=Benzene --=Not Measured/Not Analyzed (msl)=Mean Sea Level T=Toluene QA=Quality Assurance/Trip Blank TPH=Total Petroleum Hydrocarbons E=Ethylbenzene ANALYTICAL METHODS: - {� TPH-MO,TPH-DRO and TPH-GRO by EPA Method 8015B BTEX and MTBE by EPA Method 8260B * TOC elevations were surveyed on November 23,2009 by Muir Consulting,Inc. Vertical datum is NAVD 88 from GPS observations. TOC elevations were surveyed on July 14,2008,by Muir Consulting,Inc.Vertical datum is NAVD 88 from GPS observations. " Data collected from Quarterly Monitoring Report-Fourth Quarter 2006,dated 19 February 2007,by Advanced GeoEnvironmental,Inc.,and inserted into table by ARCADIS U.S.,Inc. ' Laboratory report indicates the sample was re-analyzed at a DFI outside the method hold time. The reanalysis results were<50 ug/L. 2 Laboratory report indicates DRO was detected in the method blank at a concentration of 33µg/L. Results from the reextraction are within the limits. The hold time had expired prior to the reextraction therefore,all results are reported from the original extract. The DRO result for the reextract is ND. 3 Laboratory report indicates DRO was detected in the method blank at a concentration of 33µg/L. Results from the reextraction are within the limits. The hold time had expired prior to the reextraction therefore,all results are reported from the original extract. The DRO result for the reextract is 220µg/L. 4 Laboratory report indicates DRO was detected in the method blank at a concentration of 33 gg/L,. Results from the reextraction are within the limits. The hold time had expired prior to the reextraction therefore,all results are reported from the original extract. Similar results were obtained in both extracts. NOTES: Table 1-Groundwater Monitoring Data and Analytical Results obtained from Gettler-Ryan Inc.,dated 06/15/10 Results dated from 09/12/08 to 06/15/10,compiled by Getter-Ryan Inc. Results dated 12/1/10 and subsequent,compiled by ARCADIS U.S.,Inc.