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• 09 May 2002 AGE-NC Project No 96-0232 Page 2of8 soil stratigraphy comprised of five hydrologic units First Zone from 5 to 35 feet bsg, Second Zone from 40 to 60 feet bsg, Rocky's Upper Zone from 65 to 75 feet bsg, Secondary Aquifer Zone from 85 to 105 feet bsg and Primary Aquifer Zone from 130 to at least 150 feet bsg (Final Remediation Plan, dated 31 August 2000) AGE proposes to drill and install two 2-inch diameter ground water monitoring/extraction wells (MW-14 and MW-17) screened between 40 feet and 60 feet bsg(Second Zone),two 2-inch diameter ground water monitoring/extraction wells (MW-15 and MW-18) screened between 65 and 75 feet bsg(Rocky's Upper Zone), one 2-inch diameter ground water monitoring/extraction well (MW-16) screened between 5 and 25 feet bsg (First Zone) and a triple-completed, 2-inch diameter ozone sparge well (OS-1) screened between 30 and 32 feet bsg (First Zone), 50 and 52 feet bsg (Second Zone) and 70 to 72 feet bsg (Rocky's Upper Zone) Additionally, AGE proposes to advance three Geoprobe soil borings (P-36, P-37 and P-38) to depths of 60 feet bsg to characterize and delineate the northern extent of MTBE-impacted ground water at the site The scope of work will consist of the following tasks • • Permitting, planning and pre-field work activities, • Drilling and well installation, • Performance of a Second Zone 24-hour ground water aquifer pumping test, Performance of a Rocky's Upper Zone 24-hour ground water aquifer pumping test, • Performance of an 4-week ozone sparging pilot test, • Preparation of a revised Final Remediation Plan (FRP) 21 PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be submitted to the San Joaquin County Environmental Health Department (SJCEHD) As required by SJCEHD permitting, a health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual far Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Prior to drilling activities, each proposed drilling location will be clearly marked and a utility clearance obtained through Underground Service Alert Advanced GeoEnvironmcutal,Inc