Laserfiche WebLink
ADDITIONAL ASSESSMENT WORKPLAN <br /> JAMAR SERVICE,STOCKTON <br /> APRIL 2002 <br /> Groundwater Purging <br /> The newly developed wells will be allowed to equilibrate for a mm rnum of 48-hours pnor to <br /> purging for sampling Prior to purging, depths to groundwater an all wells will be measured to <br /> the nearest 0.01-foot A minimum of three casing volumes of groundwater will then be pumped <br /> from each well prior to groundwater sampling. <br /> Specific conductance,pH, temperature, and turbidity will be measured during the purging <br /> process When these parameters have relatively stabilized, the wells will be allowed to recharge <br /> and then sampled <br /> Groundwater Sampling <br /> Groundwater samples will be collected from all on-site wells after the wells have sufficiently <br /> recovered to the static groundwater levels, or in the event that the well is pumped dry during <br /> purging,when the water level recovers to at least 80%of the original water level In the event <br /> that the wells are not sampled within 24-hours of purging,each well will be re-purged until at <br /> least three well volumes have been removed prior to sampling <br /> Groundwater samples will be collected using a new disposable bailer, and transported to a state <br /> certified laboratory under proper COC documentation The groundwater sample will be decanted <br /> from the bailer into laboratory provided containers appropriate for the analytical method <br /> requested The samples will then be placed into a chilled cooler in preparation for transport to <br /> the laboratory Strict COC protocol will be followed during sample collection and handling <br /> Groundwater Analyses <br /> The groundwater will be analyzed by a California certified laboratory an accordance with state <br /> guidelines and EPA protocol The groundwater samples will be analyzed for TPH G, TPH D, <br /> BTEX, 1,2-DCA,EDB, and fuel oxygenates using EPA Methods 8015M and 8260B, <br /> respectively <br /> Site Survey <br /> Following installation of the new groundwater monitoring wells,the location and elevation of the <br /> new wells will be surveyed using a laser level relative to mean sea level to the nearest 0 01 <br /> vertical foot The elevations will be tied to the existing well casing elevations Static <br /> groundwater levels will be measured to the nearest 0 01-foot <br /> 10 <br />