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s � <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> m ' < Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • �.. ;P.• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> qCikoar' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> MAR 13 2002 <br /> JIM LANCASTER <br /> WOOLSEY OIL INC <br /> 166 FRANK WEST CIR <br /> STOCKTON CA 95206 <br /> RE: Woolsey Oil Cardlock SITE CODE: 508175 <br /> 1501 W. Charter Way ROM 0000640 <br /> Stockton, CA., 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> Quarterly Monitoring Report (QMR) dated February 22, 2002 as submitted by <br /> Ground Zero Consulting on February 22, 2002 and has the following comments. <br /> This QMR covers the sampling event held on February 7, 2002 and provided <br /> groundwater data collected from the three (3) monitoring wells installed onsite on <br /> November 22, 1999. <br /> The groundwater flow direction has varied for this site since the monitoring wells <br /> were installed. No one direction has been established and only recently have <br /> two consecutive quarterly events indicated the same direction. Due to this <br /> unusual condition, EHD has concluded that the elevated levels of petroleum <br /> (MtBE) in the groundwater at the centrally located monitoring well, "MW-3" are <br /> not vertically defined and laterally defined when the groundwater flow direction is <br /> to the northwest or southeast. Further investigation and monitoring well <br /> installations are needed in order to delineate the plume of contamination. <br /> Recommendations included within this most recent QMR indicated that your <br /> consultant thought "exploring methods to enhance the contaminant degradation <br /> process" may prove to be a viable remedial alternative for this site. The field <br /> data needed to support this recommendation should be collected during the next <br /> phase of investigation required at this site. <br /> Responsible parties are required to abate or correct the actual or potential effects <br /> of an unauthorized release from underground storage tanks (UST). Please be <br /> advised that any Corrective Action conducted on this site must be evaluated with <br /> the site contamination defined. Without plume delineation, the problem this site <br /> poses cannot be evaluated and enactment of a Corrective Action Plan cannot be <br /> approved by EHD. <br /> EHD can approve Interim Corrective Action to occur at UST sites without <br /> complete plume delineation when it has been established that conditions exist <br /> making it necessary. <br />