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�' o a�+$j� ``,9� �: '� �5.��uk• - t�"' 'ice �3 �--� ,-r - �' s��- i ,r�„ t � e�� -},.: ".S� x Y- .a _ _ .7`. .�u '" ,r y� r�' I -•ter` `" ' �1:s` Y €:.:¢� "sen *€''4 -�.: i FIELD PROCEDURES 3 I l This plan describes the safety requirements for purging and sampling ground-water monitoring wells. The site safety plan is applicable to personnel of Applied GeoSystems who perform worst at the site. A copy of the site safety pian is available for reference by appropriate parties during the work. The onsite Staff Geologist of Applied GeoSystems acts as the Site Safety Officer. Ground-Water Sampling The static water level in each well was measured to the nearest 0.01 foot with a Solinst electric water-ievel sounder cleaned with a laboratory-grade,non-phosphatic detergent and deionized water before use in each well. A clean bailer was used tr, obtain a sample from the surface of the water in the, well for a subjective analysis of hydrocarbons. The sample was retrieved and visually examined for floating product, sheen, color, and clarity. Approximately 3 well volumes of ground water were purged from the wells using a staintess- steel electrical submersible pump. 'I'lic pump, cables, and hoses were cleaned with a laboratory-grade, non-phosphatic detergent and water before use in each well. The wells were purged until withdrawal was of sufficient duration to result in stabilized pH, temperature, and electrical conductivity of the water, as measured by portable meters calibrated to a standard buffer and conductivity standard. The wells recovered to more than 90 percent of the static water level within 5 minutes of turning off the pump. The ground water purged from the wells was temporarily stored in 17-E, steel, 55-gallon liquid waste drums approved for this use by the Department of Transportation. Before collecting each ground-water sample, the geologist cleaned the Teflon bailer with a laboratory-grade detergent and rinsed it with tap water and deionized water. Hydrochloric acid was added to the sample vials as a preservative. A sample of the formation water then was collected from the surface of the water in each of the wells with the Teflon bailer and slowly transferred to laboratory-cleaned sample containers. ReWrEng Re3ults of Anal ses Hydrocarbon constituents in ground-water samples are reported by the laboratory in units of parts per billion (ppb). The maximum contaminant levels listed in Title 22 of the California Code of Regulations for benzene, ethylbenzene, and total xylene isomers in W drinking water are 1.0, 680,r A 1,750 ppb,respectively. The action level established by the California Department of health Services for toluene is 100 ppb. To conform with the iaboratory reports,we report groundwater chemical data in units of ppb.