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' All drilling equipment will be cleaned prior to arrival on site In addition, to avoid cross- <br /> contamination of borings, all appropriate downhole drilling and sampling equipment will be <br /> cleaned between borings <br /> 2 3 2 Monitoring Well Development and Survex <br /> ' After the monitoring wells are completed and the grout has had sufficient time to set (at least 72 <br /> hours), the wells will be developed by surging and pumping Prior to developing a well, the well <br /> tvolume will be calculated and documented The well will be considered developed once at least <br /> five (5) well volumes have been removed and groundwater temperature, pH, electrical <br /> ' conductivity and turbidity have stabilized At least 48 hours after development, the wells will be <br /> monitored and sampled <br /> ' A licensed surveyor will survey each of the newly Installed wellheads The surveyor will measure <br /> the elevation of the top of well casing to the nearest 0 01 foot, referenced to an established <br /> ' benchmark <br /> 2 3 3 Waste Disposal <br /> All waste soil, groundwater and equipment rinsate wastewater will be contained In separate 55- <br /> gallon drums for appropriate storage, transport and disposal Based on the presence of <br /> petroleum hydrocarbons, the waste soil and equipment ansate can likely be disposed of as non- <br /> hazardous waste In lieu of analytical testing to declassify the waste groundwater as non- <br /> hazardous, it will be disposed of as non-RCRA hazardous waste liquid <br /> ' 24 Quarterly Groundwater Monitoring <br /> ' On a quarterly basis for a period of at least one year, the newly installed wells will be monitored <br /> and sampled according to the following methods and procedures <br /> ' 2 4 1 Groundwater Monitoring and Sampling <br /> ' During each of the quarterly monitoring and sampling events, depth-to-groundwater and free <br /> product thickness (if necessary) will be monitored in each well using a water level Indicator or an <br /> ' Interface Probe TM capable of measurements to within 0 01 foot <br /> ' Work Plan Environmental Site Investigation Ramage Environmental <br /> 392 South Moffat Blvd,Manteca California June 18, 1997 <br /> 7 <br /> 1 <br />