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I DHQ-Manville June 16, 1972 K. J. Whalen STOCKTON PIPE. PLANT PROCESS [,ASU PERCOLATION AFFECT ON GROUND MATER Rim 211912 h1 PI.ANi MGR. _� �,A StOCK10N U% At the request of Pipe DHQ, four (4) test holes were drilled in the ground at select -d points in the vicinity of the asbestos -cement process settling ponds. Samples at groundwater which was encountered were sent to a laboratory where they were analyzed for various chenical constituents common to A/C process wastes. The purpose of these tests was to ascertain if, and to what degree, percolation of process effluents into the groundwater strata is changing the quality of the natural groundwater. The manner in which the tests were performed, the findings and general comments are contained in a report,ent:itled RESULTS OF CUEMICAL TESTS ON WATER AND SOIL SAMPLES -JOHNS MANVILLE' PLANT-STOCKTOiN, CALIFORNIA - File No. S-1182-3, dated May 31, 1972 by J. H. Kleinfelder and Associates. The report is on file in Pipe D1:Q Production Department. `The report concludes with the comment "From the data obtained, we find no evidence to indicate that the groun&,,atcr is affected by the wastewater storage, at this time. It is possible, however, that this could change in the future". From consideration of the data in the report we feel that it would be difficult to show that percolation of process effluents from the pond at Stockton Plant is changing the natural groundwater in any significant way. On the other hand, it should be kept in mind that it might also be very difficult to show that it is not. The most significant comparisons that can be made are: Pondwater PH 10.5-11.4 Dissolved Solids 570-1130 Total Hardeners. 340-750 Ca 130-293 Cl 133-160. Na 53-71 SO4 140-284 (all in ppm except Ph) Immed. Adiacent to Pond 7.3-8.0 590-710 160-350 24-190 150-180 61-83 49-266 750' from Pond 7.8 530 390 79 100 66 123