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PUBLIC HEALTH SERVICES �o <br /> .G <br /> SAN JOAQUIN'COUNTY < Za <br /> JOGI KHANNA M.D.,MRR <br /> Health Officer ., �P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) <br /> 0 Stockton, California�95201 4 Z r F 6.4 e� <br /> (209)468-3400 <br /> U� <br /> JOHN JOHNSON <br /> THE CUSTOMER COMPANY AUG 10 1993 <br /> P O BOX 886 <br /> BENICIA CA 94510 <br /> RE: 15 EAST GRANT LINE ROAD SITE CODE: 1404 <br /> TRACY CA <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) has completed the <br /> review of the "Interim Report on Subsurface Investigation" dated April 20, 1993, submitted by Parker <br /> Environmental Services, and has the following comments. <br /> The installation of additional soil borings and a monitoring well,as recommended in the report,are warranted <br /> to investigate the full extent of the groundwater contaminant plume at this site. However, in addition'to the <br /> monitoring well proposed to the west of the tank pit area, another monitoring well must be installed to the <br /> north-northeast of monitoring well MW#4. This well is needed to monitor the groundwater plume in this <br /> downgradient direction. <br /> A brief workplan showing the construction specifications of the proposed monitoring well must be submitted <br /> prior to the initiation of the work. The proposed work can be completed under your active permit(#9370279) <br /> as long as the work will be performed by the C-57 license holder to whom the permit was originally issued. <br /> Accurate groundwater gradient and flow direction data is essential for determining contaminant plume <br /> migration patterns as well as for determining appropriate corrective action responses. Monthly groundwater <br /> level measurements may provide a better indication of groundwater flow patterns than the quarterly <br /> measurements. Monthly groundwater measurements should be initiated if future groundwater data suggests <br /> a divergent groundwater flow ;pattern. <br /> If you have any questions regarding this letter, please contact Linda Turkatte, Senior REHS, of my staff at <br /> i <br /> (209) 468-3441. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> t <br /> Donna Heran, REHS, Program Manager <br /> Environmental Health Division <br /> I <br /> LAGLT:lb <br /> c: CVRWQCB-Beth Thayer <br /> c: John and Francine Sallaberry <br /> c: Parker Environmental-Jim Parker <br /> i <br /> A Division of San Joaquin County Health fare Services <br />