Laserfiche WebLink
Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to March 9, 1998,were compiled from reports prepared by MPDS Services,Inc. <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> TOC=Top of Casing --=Not Measured/Not Analyzed <br /> (ft.)=Feet B=Benzene <br /> T=Toluene (D)=Duplicate <br /> DTW=Depth to Water QA=Quality Assurance/Trip Blank <br /> S.I.=Screen Interval E=Ethylbenzene <br /> (ft.bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> (ms])=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,msl). <br /> Site re-surveyed on February 10, 1999 by Field 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 factor: [(DTW-TOC)+(Product Thickness x 0.75)]. <br /> Laboratory reported the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture. <br /> Laboratory reported the hydrocarbons detected did not appear to be gasoline. <br /> 3 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 /> 4 MTBE by EPA Method 8260. <br /> 5 Laboratory report indicates gas and unidentified hydrocarbons<C7. <br /> 6 Laboratory report indicates discrete peak C6. <br /> 7 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> 8 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12. <br /> 9 Well development perfonned. <br /> to Laboratory report indicates gasoline C6-C12. <br /> 11 Laboratory report indicates weathered gasoline C6-C12. <br /> 12 Detection limit raised. Refer to analytical reports. <br /> 13 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6. <br /> 14 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons C6-C12. <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 /> 17 Sample collected from bottom of well using discrete bomb sampler at 69 feet. <br /> 1s Well development not completed. DTW only. <br /> t9 Sample collected at the top of water column using a disposable bailer. <br /> 0187.xIV45 As*29/03 <br />