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�,... •� :'� x,.7.•s., _ Wn�r _ u a 16 GOLDEN GRAIN COMPANY December 21, 1989 202/799-5045.06 plastic bottles were preserved with nitric acid. All samples were labeled, preserved on ice, and delivered with the appropriate Chain-of-cus'ody forms to GTEL for analysis. p VV on November 17, 1969, the site was professionally surveyed by Carl Rodolf and Associates, Ing. of Sacraments, California. ided accurate elevations for calculation of water The survey prov nd horizontal table elevations and groundwater gradients, a control to allow the construction of an accurate site map (Figure 3) . 3.4 AQuIF F•R TESTS IIJ UL% f ttN 1UVUJ 1 Slug tests provide data that can be used t4 calculate esti- mates of aquifer transmissivity and hydraulic conductivity- Slug tests were performed at the site on November 20. 1989 in wells MW-7 and MW-10 through MW-14. All of these wells were drilled to approximately 50 feet. Wells MW-10 through MW-14 are screened 50 feet; MW-7 is screened from 30 to 50 from approximately 10 to � e saturated sand and gravel unit and feet, entirely within th table. In wells matelyr10 feet- 14, entirely below the water above the sand pack and well screen extend appo the water table. variations in groundwater levels as a response to the introduction and withdrawal of a slug of a known volume were measured using a down-hole pressure transducer. The transducer has a full scale range of 35 feet of water and a sensitivity of less than 0.01 foot of water. Data from the transducer werevice recorded in an Envirolabs model DL-120 data logg er. This can be programmed to provide a pseudo-logarithmic sampling rate - - and can take water_level_readings at rates of up to five readings �- per second, .providing the precision and accuracy necessary to GROUNDWATER b TECHNOLOGY,INC. f