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PROPOSED REMEDIATION SYSTEM JPCA strongly suggests that an extraction well, with a 4 inch diameter casing, be constructed adjacent to the Boring B1 . The well head will be placed in a service vault with piping from the well head, in a subsurface channel, to the rear [north] of the" property where a Carbon Absorption Unit would be placed. CALGON INC. and several other carbon suppliers have had good results in the use of Absorbing Activated Carbon for the removal s of fuel products, specifically gasoline, BTEX and MTBE The engineering .design of such a system will be dependant on the pumping rate from the well, the maximum absorption rate of the activated carbon per gallon of flow and the ability for the effluent from the system to be sent to the storm sewer system. A National. Pollutant Discharge Elimination System (NPDES) general permit .is required. : SCOPE OF WORK Task 1 JPCA will design a Carbon Absorption System for the removal of TPHG, BTEX and MTBE from the groundwater extracted from the subject property. Task 2 JPCA will request a NPDES permit from the Central Valley Regional Water Quality Control Board which will comply with the regulatory programs now in effect. Task 3 JPCA will prepare the required drilling permits from San Joaquin County Public Health Service, Environmental Health Division (SJC- PHS-EHD) , complete a site workplan, a site health and safety plan and contact U S Alert to check on placement of underground utilities. JPCA--requests that- the present owner/tenant identify any on-site -utilities and underground piping that they are aware of -on the property. Task 4 JPCA will measure the groundwater depth in the five existing monitoring wells with an electronic probe prior to purging. A new survey to establish the well heads elevation with respect to each other will be completed. The gradient will be calculated for the site based on depth to water data collected and surveyed top of the casing elevations. 2 I