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' 16 ' Groundwater monitoring well MW-10 was also developed on January 11, 1999 using the surge and bail technique The well was surged for approximately fifteen minutes using a 2- inch surge block followed by bailing with a 1 5-inch diameter by 5-foot long stainless steel bailer Well development was deemed sufficient when the parameters pH, temperature and conductivity stabilized wittun 10 percent of the previous reading for three consecutive measurements and clear water was being produced All measurements were recorded on well ' development logs which are located in Appendix C ' All well development equipment was thoroughly cleaned prior to and following use at each groundwater monitoring well location The cleaning procedures consisted of steam ' cleaning or tnple-nnse cleaning methods The tnple-nnse cleaning method employed consisted of washing the equipment in potable water with a cleansing solution, rinsing in potable water, ' then rinsing with distilled water All purge water was placed in 55-gallon drums which were labeled and left on-site pending final disposition 4.6 WELL SURVEY ,1 Following well completion, the Northing/eastmg coordinates and elevation relative to ' mean sea level for each new and existing well were surveyed by a California Licensed Land Surveyor A Plat of Survey is provided as Appendix D 4.7 QUARTERLY GROUNDWATER MONITORING 1 Groundwater sampling activities were completed on February 4, 1999 by Gettler-Ryan 1 Groundwater sampling procedures are provided in the quarterly report prepared by Gettler- Ryan located in Appendix E