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' CATELLUS DEVELOPMENT CORPORATION Date 12/1/97 <br /> WEST WEBER SITE, STOCKTON Setup time 1428 <br /> QUARTERLY GROUNDWATER SAMPLING Weather Clear <br /> • FIELD NOTESIERM WEST 2996 00 Samplers DEM/CJH <br /> WELL # MW-4A <br /> HISTORIC CONCENTRATIONS <br />' Location Construction Depth 25 ft bgs <br /> Construction 2 inch pvc/ Measured Depth 2136' <br /> Groundwater Zone Purge Method Grundfos Pump(2") <br /> Screened Interval 13-24 5 ft bgs Pump Intake <br />' Sample Method Disposable Barter Depth to Water 8 25' <br /> Sample Preservation Method Ice Height of Water Column 1311' <br /> Volume of one casmg 214 gallons <br /> Purge Start Date 12/1/97 <br /> Purge Start Time 1438 Purge calculations <br /> Discharge Rate -1 gpm 1311 ft x 163 gals / ft x 3= <br /> Purge End Time 1449 6 41 gallons <br />' Time Gallons Temp.°C pH EC ps/cm Water clarity <br /> 1440 2 2007 758 1202 Turbid <br /> 1443 4 2055 723 1242 Turbid <br /> 1446 6 2068 716 1230 Turbid <br /> 1449 8 2070 715 1232 Turbid <br />' ANALYSES REQUIRED SAMPLE TIME CONTAINER TYPE FILTRATION? <br /> Fe+2 3 x 40 ml VOA HCL <br /> pH,Conductivity,Chloride 500 ml Poly <br /> Nitrate 500 ml Poly <br /> Dissolved Methane,Dissolved CO2 3 x 40 ml VOA <br /> BTEX,Trunethylbenzene,TPHg 6 x 40 ml VOA HCL <br />' TPHd 2 x 1 Liter Amber Glass <br /> Dissolved Mn 500 ml Poly HNO3 In the Field <br /> FIELD OBSERVATIONS(Well condition, repairs needed) <br /> 1 <br />' PID reading when well cap opened NA Disposal method of purge water Drummed on site <br /> DO readings (mg/1) 2 95,0 81,0 41,0 36 Decontamination procedure Alconox/DI Rinse <br />' Redox Measurement(mV) 350,359,364,363 <br /> Other notes <br />' Si Sam ler s <br /> P Signature(s) HCl <br /> 1 <br />