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Table 3-3 <br /> C-Sparger Area Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station No.0187 <br /> 437 East Miner Avenue <br /> Stockton,Calffornia <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to November 29,2003,were compiled from reports prepared by Gettier-Ryan,Inc. <br /> TOC=Top of Casing TPi=Total Petroleum Hydrocarbons as Gasoline (ug+L)=micrograms per liter <br /> {ft)=Feet B=Benzene - =Not Measured/Not Analyzed <br /> OTW w Depth to Water T=Toluene <br /> (D)=Duplicate <br /> S-I.=Screen Interval E=Ethylbenzone QA=Quality Assurancerr ip Blank <br /> (ft.bgs)=Feet Below Ground Surface X=xylenes <br /> GWE=Groundwater Elevation MTBE,.Methyl tertiary butyl ether <br /> (mel)=Mean sea level <br /> ` TOC elevations have been surveyed relative to Benchmark marked'IS-9'In monument box at San Joaquin and Oak Streets,(Elevation=10.523 feet,rii <br /> Site re-surveyed on February 10,1999 by Feld Designs- TOC elevations were surveyed on November 16,2000,by Virgil Chavez Land Surveying using <br /> the previous Benchmark, <br /> -` GWE corrected due to the presence of free product; correction tactor.I(DTW-Ti+(Product Thickness x <br /> Laboratory reported the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture. <br /> Laboratoryreported the hydrocarbons detected did not appear to be gasoline- <br /> ' Laboratory has Identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 ppb in the sample collected from this well, <br /> ° MTBE by EPA Method 82603. <br /> s Laboratory report indicates gas and unidentified hydrocarbons cC7. <br /> Laboratory report indicates discrete peak C6. <br /> Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> ° Laboratory report indicates gasoline and unidentified hydrocarbons C6-012. <br /> ° Well development performed. <br /> 10 laboratory report indicates gasoline C6-C12. <br /> Laboratory report indicates weathered gasoline C6-C12. <br /> 12 Detection limit raised.Refer to analytical reports. <br /> 13 Laboratoryre ort indicates gasoline 12+unidentified hydrocarbons cC6. <br /> t4 Laboratoryre ort indicates gasoline Ci 12+unidentified hydrocarbons C6-012. <br /> 15 Detection limit raised due to high levels of non-target compounds-Refer to analytical reports. <br /> 16 Sample collected from bottom of well using discrete bomb sampler at 114 feet. <br /> Sample collected from bottom of well using discrete bomb sampler at 69 feet. <br /> ve <br /> Well development not completed. DTW only. <br /> EXPLANATIONS,_ (cont) <br /> 19 Sample collected at the top of water column using a disposable baiter. <br /> 20 Sample collected from screened interval in well(bottom of well)using a bomb sampler. <br /> 21 Reported as NP-1-111 in Analytical Report and Field Data Sheet,due 10 well caps inadvertently switched. <br /> 22 Reported as NP-1-22 in Analytical Report and Field Data Sheet,due to well caps inadvertently switched_ <br /> 23 Reported as NP-1.65 in Analytical Report and Field Data Sheet,due to well caps inadvertently switched. <br /> 24 Reported as NP-2-60 In Analytical Report and Field Data Sheet,due to well caps inadvertently switched. <br /> 25 Reported as NP-2-116 in Analytical Report and Field Data Sheet,due to well caps inadvertently switched. <br /> 26 Reported as NP-2-22 in Analytical Report and Field Data Sheet,due to well caps inadvertently switched. <br /> 27 MTBE by EPA Method 8260 was analyzed beyond the EPA recommended holding time. <br /> 20 Laboratory report indicates a hydrocarbon pattern a present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br /> 2° Laboratory report indicates gasoline C6-C 10, <br /> w Welt purged dry during event, <br /> 06940-325 39 0l 39 ENSR Corporation <br />