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CATELLUS DEVELOPMENT CORPORATION Date 5/7/97 <br /> WEST WEBER SITE,STOCKTON Setup time 1250 <br /> QUARTERLY GROIWDWATER SAMPLING Weather Clear <br /> FIELD NOTES 1 ERM WEST 299600 Samplers DEM/CJH <br /> WELL # MW-2A <br /> HISTORIC CONCENTRATIONS <br /> ' Location Construction Depth 10 5 ft bgs <br /> Construction 6 inch pvc/ Measured Depth 9 72' <br /> Groundwater Zone Purge Method Grundfos Pump (2") <br /> Screened Interval 3 5-10 5 ft bgs Pump Intake -- 8' <br /> Sample Method Disposable Bailer Depth to Water 3 96' <br /> Sample Preservation Method Ice Height of Water Column 5 76 <br /> Volume of one casing 8 64 gallons <br /> ' Purge Start Date 5/7/97 <br /> Purge Start Time 1259 Pure calculations <br /> Discharge Rate —1 gpm 5 76 ft x 1 5 gals / ft x3= <br />' Purge End Time 1328 25 92 gallons <br /> Time Gallons Temp°C pH EC ps/cm Water clarity <br /> 1307 7 1897 1065 818 Clear <br /> 1314 14 1915 1079 1105 Clear <br /> 1321 21 1922 1076 1091 Clear <br /> 1328 28 1 1932 1 1076 1 1076 Clear <br /> ANALYSES REQUIRED SAMPLE TIME CONTAINER TYPE FILTRATION? <br /> Fe+2 1345 2 x 40 ml VOA HCL <br /> pH,Conductivity,Chloride 500 m] 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 0 21 mg/l Decontamination procedure Alconox/DI Rinse <br /> Redox Measurement -15 mV <br /> Other notes <br /> Sampler Signature(s) I V 1 V <br /> �1 <br />