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CATELLUS DEVELOPMENT CORPORATION Date 5/6/97 <br /> WEST WEBER SITE,STOCKTON Setup time 1510 <br /> QUARTERLY GROUNDWATER SAMPLING Weather Clear,Windy <br /> FIELD NOTES/ERM WEST 2996 00 Samplers DEM/CJH <br /> ' WELL # MW-4 <br /> HISTORIC CONCENTRATIONS <br /> ' Location Construction Depth 15 ft bgs <br /> Construction 2 inch pvc/ Measured Depth 15 01 <br /> ' Groundwater Zone Purge Method Grundfos Pump (2") <br /> Screened Interval 10-15 ft bgs Pump Intake —9 5' <br /> Sample Method Disposable Bailer Depth to Water 4 82 <br /> Sample Preservation Method Ice Height of Water Column 1019' <br /> Volume of one casing 166 gallons <br /> Purge Start Date 5/6/97 <br /> Purge Start Time 1517 Purge calculations <br /> Discharge Rate --1 gpm 10 19 ft x 163 gals / ft x 3= <br /> Purge End Time 1523 4 98 gallons <br /> Time Gallons Temp °C pH EC gs/cm Water clarity <br /> 1519 2 2194 817 599 Clear <br /> 1521 4 2174 797 610 Clear <br /> 1523 6 2170 771 <br /> 650 Clear <br />' ANALYSES REQUIRED SAMPLE TIME CONTAINER TYPE FILTRATION? <br /> Fe+2 1530 2 x 40 ml VOA HCL <br /> pH,Conductivity,Chloride 500 ml Poly <br /> Nitrate 500 ml Poly H2SO4 In the Field <br /> Dissolved Methane,Dissolved CO2 2 x 40 ml VOA <br /> BTEX,Trimethylbenzene,TPHg 4 x 40 ml VOA HCL <br /> TPHd 2 x 1 Liter Amber Glass <br /> Dissolved Mn 500 ml Poly HNO3 In the Field <br /> Heterotrophic Plate Count 125 ml Plastic Na Thiosulfate <br /> FIELD OBSERVATIONS(Well condition,repairs needed) <br /> PID reading when well cap opened 0 0 ppm Disposal method of purge water Drummed on site <br /> Dissolved Oxygen reading 2 30 mg/1 Decontamination procedure Alconox/DI Rinse <br /> Redox Measurement 71 mV <br /> Other notes <br /> Sampler Signature(s) <br />