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PUBLIC` HEALTH SERVICES aa� Fo <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer ..• ;•;� <br /> �rFOR� <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> !JUL 2 0 2001 <br /> HAROLD & DENA KNOWLES ROEK BROTHERS <br /> C/O PATRICK RIDDLE DON ROEK <br /> 7574 SHORELINE DRIVE P O BOX 30038 <br /> STOCKTON CA 95219 STOCKTON CA 95213-0038 <br /> RE: 102 S. Wilson Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed "First Quarter 2001 Groundwater Sampling Report" <br /> dated April 11, 2001, "Second Quarter Groundwater Sampling Report" dated July <br /> 17, 2001, and "Confirmation Boring and Groundwater Monitoring Well Installation <br /> Report" dated May 18, 2001, prepared by Ground Zero Analysis, Inc. for the <br /> above referenced site. <br /> The lateral and vertical extent of soil and groundwater contamination still have <br /> not been defined for this site. PHS/EHD does not agree with the report <br /> statement that the vertical extent of soil contamination was defined or that the <br /> contamination shown in confirmation boring CB1 at 135 feet below surface grade <br /> is from cross contamination and that the contaminant levels are inconsequential. <br /> There is still soil and groundwater contamination existing on site at high levels <br /> that is a result of a release of petroleum hydrocarbons from the underground <br /> storage tanks previously operated at this site. There are no down gradient wells <br /> with screens intersecting first water. The lateral and vertical extent of soil and <br /> groundwater contamination must be defined by installing monitoring well clusters <br /> with various screen intervals or the use of multi-level monitoring well casing. <br /> The direction of groundwater flow at this site and the site at 101 S. Wilson Way, <br /> Stockton, has been predominantly to the northeast and east. There have been <br /> reports for this site that showed the groundwater flow to be southeast and this <br /> has been the reported direction of groundwater flow at 130 S. Wilson Way, <br /> Stockton. In May 2001 your consultant and the consultant for 130 S. Wilson Way <br /> worked together and determined the groundwater flow was easterly. PHS/EHD <br /> recommends you work with the responsible parties and consultants for 101 S. <br /> Wilson Way and 130 S. Wilson Way to determine current and previous <br /> groundwater flow directions, provide conclusive information as to the source of <br /> the contamination evidenced in monitoring wells MW3, MW4, MW14 and resolve <br /> responsibility for the sampling and remediation of the contamination in these <br /> wells. You installed these wells, are the owner of the wells and are responsible <br /> for the sampling and care of the wells until you provide another owner. <br /> A Division of San Joaquin County Health Care Services <br />