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C DEEP WELL INJECTION AND FRESH 3 1989 WATER PROTECTION Pp0 MESE�vGEs'M P.S.E. San Joaquin Cogeneration Waste Disp( oo aA�SI Beginning in the 1950 's deep well disposal of liquid wastes at great depths has proven to be an environmentally and technically sound waste disposal method. Safe underground disposal however, depends on the availability of appropriate underground formations or sediment deposits that have the natural ability to confine the waste so that it remains immobile. PSE's proposed underground waste water injection project located 4 miles west of the City of Manteca (Exhibit No. 1) was reviewed by the consulting firm of Wilson Zublin, Inc. Included in this report is a summation of our findings, along with diagrams designed to demonstrate the favorable geological conditions beneath the P.S.E. property for the storage of liquid waste, and more importantly, how it relates Cl to the protection of the groundwater from contamination by these fluids. Subsurface geology presented in Exhibit No. 2 illustrates favorable geological conditions for injection. The red line on Exhibit No. 1 shows location of the wells studied and proximity to the proposed site. Exhibit No. 2 shows a vertical profile -view of the subsurface as it would appear in a general east-west direction, 1/2 mile south of the P.S.E. property. Below the surface of the ground the earth consists of numerous layers of stratified rock ranging in _ thickness of 10 's to 1000 's of feet thick. Only those rock layers important to this project were depicted to greatly simplify this diagram. This section was drawn from information gathered from deep wells drilled in the vicinity of the property and the names of these wells are shown along the top of the profile. Quite simply, the waste water is planned to be injected and Cstored in - two sandstone layers at a depth of approximately 4, 500 WILSON ZUBLIN INC.