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MAR. -30' 95 (THU) 16: 18 NOLTE & ASSOC. SACTO TEL:916 641 9222 P. 010 L Mr. Jim Hamrick July 14, 1994 Page 9 the wastewater shows high levels of total dissolved solids (TDS), specific conductance (E.C.), and various trace minerals. Thirty-four halocarbon and aromatic constituents were analyzedby EPA Methods 601 and 602 and were determined to be undetectable in the wastewater. A list of the halocarbon and aromatic constituents are listed in Appendix D. GROUND WATER MONUORiNG PLATY (WORKPLAN) The wastewater discharged to the disposal ponds consists of reverse osmosis (RO) backwash water and minor amounts of process water. Constituents entering the ponds which could impact ground water are total dissolved solids (TDS), electrical conductivity (E.C.), and chlorides from the RO backwash. Other sources of TDS and chlorides to the local ground water could include the Biomass Recovery Facility storage ares and disposal ponds. The agricultural activities in the area could be other sources of TDS, chlorides and nitrates. A review of the literature suggests that the area around the Owens-Brockway Glass Containers Facility has a shallow water zone within about 10 ft of the land surface and the Corocoran Clay Member, an impermeable confining strata, is approximately 50 ft below the land surface. Reviewing the Well Driller's log for the plant water supply indicates a number of thick clay layer exists and the first water bearing zone appears to be at 170 ft. It is unclear from the drillers log where the Coroccran Clay Member begins and the depth of the shallow water bearing zone. Depth to ground water levels for the area around the Owens- Brockway Glass Containers facility are unavailable. To provide a clearer picture of the ground water level and quality beneath the Owens- Brockway Glass Containers facility, the installation of three ground water monitoring wells is recommended. One ground water monitoring well should be located up-gradient of the facility, and two ground water monitoring wells should be located down-gradient.. Approximate locations for the up-gradient and two down-gradient monitoring wells are shown in Figure 3. A minimum of three monitoring wells is necessary to determine the true ground water direction. The monitoring wells will provide information regarding ground water quality and movement. Recommended design criteria for the proposed monitoring wells are presented in Table 3. A proposed detail of a monitoring well is illustrated in Figure 4. The top of casing of each monitoring well should be surveyed to determine the actual elevation. After completion, initial ground water samples from the monitoring wells should be sampled for general minerals and nitrates. Subsequent samples should be sampled for pH, total n04TF.J A*VXrATES L e