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GROUNDWATER ASSESSMENT REPORT TABLE 9 MUNICIPAL GROUNDWATER WELTS e Name Well Location Well N Depth UOP Pharmacy Well#3 �T Brookside/Pacific Avenue 510 feet � f UOP Burns Tower Well#2 Pacific Avenue/Knoles 502 feet CA Water Service Well#4-01 Ellis/Bonnie Lane 548 feet CA Water Service Well#18-01 Atlee/Commerce Street 408 feet CA Water Service Well##26-01 Wyandotte/Commerce Street 405 feet CA Water Service Well#27-01 Pershing/Telegraph Avenue 400 feet CA Water Service Well#31-01 La Jolla/Grange Avenue 517 feet CA Water Service Well#36-01 Manchester/Churchill Street 535 feet CA Water Service Well#38-01 Commerce North of Essex Street 503 feet ' CA Water Service Well#47-01 Bianchi East of Bidwell Place 519 feet CA Water Service Well#49-01 Brookside West of Crown 512 feet CA Water Service Well#66-01 El Dorado/Ingram Street 510 feet CA Water Service Well#66-02 El Dorado/Ingram Street 520 feet Well construction data on the two wells owned by UOP was provided to ESA The well is located at Pacific Avenue at Brookside Road (referred to as the Pharmacy Well#3) and is 510 feet deep with the well screened from approximately 225 to 510 feet bgs Water level in this well is 55 feet bgs According to the well log, shallow groundwater(water table)is separated from the lower, possibly confined groundwater—bearing zones by over 70 feet of clay"hardpan" , soils The Burns Tower,Well#2 is located on Pacific Avenue between Fulton and Knoles Streets This well is 502 feet deep with the well screened from 130 feet to the bottom The water , table in this location is separated from the lower groundwater bearing strata by about 35 feet of brown clay The clay unit iii this area(extending from approximately 40 to 110 feet below - - - ground surface) is expected to form a relatively impermeable aquitard that would diminish a , vertical groundwater gradient between the water table and lower source aquifer Considering the consistency of the fine-grained soils encountered by ESA, hydraulic conductivity for the shallow groundwater may be relatively slow and could range from 1x10-a to Ix10 6 centimeters per - second or between 10 and 100 feet-per year 3 _ _ �� -r The information and geologic conditions described above, indicates that contamination, if any, in 4 the shallow soils would have a very low likelihood of migrating into the—deeper—aquifer 3 Hunt,Geotechnical Engineering Investigations Handbook,McGraw Hill,New York,New York, Groundwater Assessment Report 23 ESA 1200252 September 2003