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' �`u[#� OES�N�6RbIblATIW}5 e <br /> 2.0 FIELD SAMPLING SUMMARY <br /> t <br /> Groundwater samples were collected from monitor wells MW-2A and MW-9 (Figure 1-1, figures <br />' follow the text) on 10 August 1999. Groundwater sampling data sheets are presented in Appendix <br /> B <br /> Water levels in all wells were measured on 23 August. Water levels in wells MW-2A and MW-9 <br /> were measured prior to sampling The standing water volumes within wells scheduled for <br />' sampling were then calculated using the water level measurements and total well depths. A <br /> submersible pump was used to purge three well casing volumes from monitor wells MW-2A and <br />' At the beginning and during the purge process, the temperature, pH, and specific conductance of <br /> the purge water was measured This information was recorded on a sampling data sheet. <br />' Groundwater samples were collected from wells MW-2A and MW-9 with a disposable bailer and <br /> nylon string A duplicate sample was collected from MW-2A The groundwater samples were <br /> transferred into 40 ml glass containers Sample containers were checked for air bubbles then <br />' sealed in a plastic bag, placed with ice in an insulated chest, and logged on a chain-of-custody <br /> form Samples were delivered to the analytical laboratory the day after the samples were <br /> collected <br />' The pump used to purge the wells was thoroughly cleaned prior to each use with an Alconox <br /> solution followed by a potable water rinse and distilled water rinse The disposable tubing was <br /> replaced with new unused tubing before purging each well <br /> I <br /> Purge water from monitor well MW-9 was stored in a holding tank located at 222 E. Weber <br />' Avenue Purge water from MW-2A was stored in a 55 gallon drum located at 100 N Hunter <br /> Street MW-2A purge water will be disposed of at a licensed treatment facility. <br /> The groundwater samples collected from MW-2A and MW-9 were analyzed by EPA Method 8020 <br /> for benzene, toluene, ethylbenzene, and xylene (BTEX) and by EPA Method 8015M for total <br /> petroleum hydrocarbons as gasoline (TPH-G) The Method 8020 analysis now includes analysis <br /> for methyl tert-butyl-ether (MTBE) at no extra cost. Groundwater sample analyses were <br /> performed by Sequoia Analytical Laboratory in Walnut Creek, California <br /> I <br /> L 1PROJECCS1,SAWOQSHSMHSA_99 SEP 3 SWcwb r 190 <br />