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PUBLIC I-PEALTH SERVIeES <br />SAN JOAQUIN COUNTY <br />ENVIRONMENTAL HEALTH DIVISION <br />Karen Furst, M.D., M.P.H., Health Officer <br />304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br />209/468-3420 <br />DONNA SANTINI GARDNER <br />1206 STRUCK <br />ORANGE CA 92667 <br />RE: Donna Gardner Property <br />26056/26080 Thornton Road <br />Thornton CA 95686 <br />OCT 2 0 1997 <br />Site Code: 1864 <br />San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed <br />the "Addendum to the Problem Assessment Report - Interim Remedial Plan" dated October 15, 1997. <br />PHS/EHD has the following comments for your consideration and response. <br />The Addendum included the recommendation to modify the construction of the proposed Thornton <br />Municipal Supply sentinel well. The Problem Assessment Report had proposed the installation of a <br />nested well which would be screened in the shallow zone and in a deeper zone of groundwater. The <br />Addendum modified the proposed construction to avoid possible cross contamination and included the <br />separation of the two wells and that the deeper well be conductor cased. Based on the Supply well's <br />construction log, PHS/EHD concurs with the modification to ensure that both zones are monitored and <br />that the deeper well be conductor cased from ground surface to 65 feet below ground surface. PHS/EHD <br />however, will require that soil samples be collected to better characterize the deeper zone, because the <br />boring/driller's log obtained during the installation of the Supply well was most likely based on <br />observations of the drill cuttings, rather than observations of discrete soil samples. <br />Please proceed with efforts to obtain pre-approval from the State Water Resources Control Board <br />Cleanup Fund for these activities. <br />If you have any questions or comments or require further information, please do not hesitate to contact <br />me at (209) 468-0337. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />111KNA) <br />Mary Meays, Senior REHS <br />Site Mitigation Unit <br /> <br />""Y V <br />Margare agorio, REHS' <br />Supervisor <br /> <br />Elizabeth Thayer, CVRWQCB <br />Martin Clark, SWRCB <br />Tom Lutterman, Smith-ATC Environmental <br />Al Hoslett, Esq. <br />Ron Rail, SJC Utilities Maintenance District <br />A Division of San Joaquin County Health Care Services