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rCATELLUS DEVELOPMENT CORPORATION Date 5/7/97 <br /> WEST WEBER SITE,STOCKTON Setup time 1400 <br /> QUARTERLY GROUNDWATER SAMPLING Weather Clear <br /> FIELD NOTES I ERM WEST 299600 Samplers DEM/CJH <br /> ' WELL # MW-1A <br /> HISTORIC CONCENTRATIONS <br /> ' Location Construction Depth 15 ft bgs <br /> Construction 2 inch pvc/ Measured Depth 14 14 <br /> Groundwater Zone Purge Method Grundfos Pump (2 ) <br /> Screened Interval 4 5-14 5 ft bgs Pump Intake — 13 5' <br /> ' Sample Method Disposable Bailer Depth to Water 5 19 <br /> Sample Preservation Method Ice Height of Water Column 8 95' <br /> Volume of one casing 146 gallons <br /> Purge Start Date 5/7/97 <br /> Purge Start Time 1404 Purge calculations <br /> Discharge Rate —1 gpm 8 95 ft x 163 gals / ft x 3= <br /> Purge End Time 1415 4 38 gallons <br /> Time Gallons Temp°C pH ECµs/cm Water clarity <br /> 1409 2 2287 756 989 Clear <br /> 1412 4 2228 762 1097 Clear <br /> 1415 6 2224 7 73 <br /> 1120 Clear <br /> ANALYSES REQUIRED SAMPLE TIME CONTAINER TYPE FILTRATION? <br /> Fe+2 1430 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 /> r 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 /> 1 <br /> PID reading when well cap opened 115 ppm Disposal method of purge water Drummed on site <br /> Dissolved Oxygen reading 0 11 mg/1 Decontamination procedure Alconox/DI Rinse <br /> Redox Measurement -78 mV <br /> Other notes PID reading in breathing zone was 0 0 ppm <br /> 0,Sampler Signature(s) / <br /> 1 �� <br />