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10 <br /> EZ-SERVE PETROLEUM MARKETING COMPANY OF CALIFORNIA <br /> QUARTERLY GROUNDWATER MONITORING PROGRAM <br /> SAMPLING AND ANALYSIS PLAN <br /> The following sections descnbe the procedures and protocols followed during this quarterly <br /> groundwater monitoring event at the subject site <br /> Depth-to-Water Measurements <br /> Prior to sampling the groundwater monitoring wells, the wells were opened to the <br /> atmosphere for approximately one-quarter of one hour, to allow the static water level to adjust to the <br /> open barometric pressure The depth-to-groundwater was then be measured, using an oil-water <br /> interface probe The interface probe was lowered slowly until free product or water was <br /> encountered At flus point, the mark on the interface probe wire was read to the nearest 0 01.feet at <br /> the permanent reference point on the top of the well casing If free product was encountered the <br /> probe was lowered until water was encountered The dfference between the two depths corresponds <br /> to the thickness of the free product The total depth of the well was then measured using the same <br /> probe A second check for free-product on top of the water column was made using a disposable <br /> bailer The disposable bailer was lowered into the water to approximately one-half the bailer length <br /> The bailer was then removed from the well and a check for the presence of free petroleum product or <br /> a product sheen was made <br /> In the event that a dedicated bailer or purge tubing existed in the well, the dedicated <br /> equipment was removed prior to sampling, and temporarily stored in a clean, plastic garbage bag <br /> The depth-to-water and bottom of well measurements, and the presence or absence of free <br /> product, was recorded on the field sampling form In addition, comments regarding the condition of <br /> the well and/or containment box were also be noted on the field sampling sheet at this time Wells <br /> observed to contain a product sheen or free product on top of the water column were not be purged <br /> or sampled <br /> Groundwater Monitoring Well Purging <br /> The depth-to-water and bottom of well measurements were used to calculate the volume of <br /> water contained in one well volume The following values were used to calculate the volume of <br /> water contained in the well casing and filter pack surrounding the well. <br /> Well Diameter CaHonsllmear foot <br /> 2-inch 0.16 <br /> 44nch 0.65 <br /> 8-inch filter pack 078 <br /> 10-inch filter pack 121 <br />