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' Clayton <br /> GROUP SERvi[ES <br /> Development consisted of surging each well followed by purging groundwater using a <br /> bailer and pump Each well was purged for approximately one hour with 93 gallons of <br /> water purged from MW-1, 113 gallons purged from MW-2, and 82 gallons purged from <br /> MW-3 Monitoring well development logs are included in Appendix D In each well, the <br /> turbidity dropped to 0 by the end of purging <br /> ' 4.0 GROUNDWATER MONITORING AND SAMPLING <br /> Following the requirements of the PHD/EHD for quarterly groundwater monitoring, the <br /> ' first monitoring event took place on January 21, 2003 <br /> Prior to purging and sampling on this date, the depth to groundwater and total well depth <br /> were measured as follows <br /> ' Depth to Water (btoc) Total Depth (btoe) Casing Water <br /> Well No (ft) (ft) Elevation Elevation <br /> (ft MSL) (ft MSL) <br /> ' MW-1 1 663 2482 431 -232 <br /> MW-2 950 2786 709 -241 <br /> MW-3 938 2837 806 -132 <br /> btoc means below top of casing <br /> The wells were purged using a disposable Teflon® bailer with 12 gallons of groundwater <br /> (approximately 4 well volumes) purged from each well Groundwater parameters (pH, <br /> conductivity, redox, temperature, and turbidity) were measured initially and following <br /> every three gallons of discharge The completed Groundwater Sampling Data Sheets are <br /> included in Appendix E <br /> ' Groundwater samples also were obtained using a disposable Teflon® bailer with a <br /> bottom-emptying device All sample containers, provided by the laboratory, were filled <br /> ' <br /> with groundwater, sealed, packed in protective plastic bags, placed in a cooler with ice, <br /> and submitted under chain of custody protocol on the same day as collected to Severn <br /> Trent Laboratories, Inc (STL) in Pleasanton, California STL is a Califorma-certified <br /> ' laboratory Groundwater samples from the three monitoring wells, as well as one blind <br /> duplicate of groundwater from MW-2 (labeled MW-4), were submitted for analysis for <br /> TPH-gas, TPH-diesel, and for BTEX, and MTBE in accordance with USEPA Methods <br /> ' 8015M and 8021B <br /> 5 <br /> S\Proj\P02263\Q 3 Rpt doe <br />