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' 26 July 1999 <br /> AGE-NC Project No 96-0235 <br /> Page 2 of 5 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected fr m each well using new disposable plastic bailers Each water <br /> sample was transferred Into 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative and into 1-liter amber bottles without preservative After collection, the samples were <br /> properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory Each sample was analyzed for <br /> I • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030/8015m, and <br /> • Volatile aromatics(benzene,toluene,ethylbenzene and xylenes,BTEX)with methyl tertiary- <br /> butyl ether (MTBE) in accordance with EPA Method 602/8020 <br /> 23 SENSITIVE <br /> RECEPTOR SURVEY <br />' A sensitive receptor survey was conducted for the area around the subject property Well location <br /> data was collected from California Water Service Company(Cal Water),City of Stockton,California <br /> I Department of Water Resources database (DWR), and the San Joaquin County Flood Control and <br /> Water Conservation District- Well Location Base Map(SJCFCD) Cal Water and City of Stockton <br /> well locations are listed by address and plotted on a Stockton map, DWR database locations are ` <br />' listed by Township, Range, Section and Tract SJCFCD well locations are plotted on a San Joaquin <br /> County map and identified using the DWR section and tract numbering system The subject property <br /> is located in Township I North,Range 6 East, Section 15, Tract A A minimum search radius of <br />' 2,000 feet from the former UST location was used for this survey <br /> 3.0. FINDINGS <br /> Results of laboratory analysis of groundwater samples and a discussion of data collected during field <br />' work follows <br /> 1 , r b i <br /> 3-1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 3 <br />' The casing elevation of each well was previously surveyed relative to a City of Stockton bench mark <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 15 80 feet to <br />' A&anced Geoinvaronmcntal,Inc <br />