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ENVIRONMENTAL HEALTH DEPARTMENT <br /> Y` SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Reran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> 304 East'Weber Avenue, Third Floor <br /> Nc Director 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 /> Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> i`6- Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> PETER LENZ NOV 2 6 2002 <br /> 6465 PACIFIC AVE <br /> STOCKTON CA 97207 <br /> RE: Howard Lenz Property SITE CODE: 2182 <br /> 1648 Shaw Road <br /> Stockton CA 95215 <br /> San Joaquin County Environmental Health Department(SJC/EHD) has reviewed the"Additional <br /> Monitoring Well Installation Work Plan"dated September 20,2002 that was submitted on your <br /> behalf by Advanced GeoEnvironmental (AGE)and has the following comments. <br /> The work plan proposes the installation of one deep, discretely screened monitoring well to monitor <br /> the contamination detected at 96 feet below surface grade (bsg) in the grab groundwater sample <br /> collected from cone penetrometer test boring CPT-1. It is proposed to install the well to total depth <br /> of approximately 100 feet bsg, with a screened interval from 90-100 feet bsg. SJC/EHDapproves <br /> the installation of this well, but does not consider 10-foot soil sampling intervals to be sufficient to <br /> properly place the deep well screen. Cross-sectional diagrams submitted with the work plan <br /> indicate that silty sands and gravelly sands exist from 90-96 feet bsg. SJC/EHD recommends a <br /> shorter sampling interval, or continuous coring, in the target zone to ensure screening the well <br /> across the sand interval and to avoid penetrating hydrologic unit 3. Your consultant may want to <br /> consider utilizing a 5-foot screen interval. <br /> In their May 16, 2002 "Soil Vapor Extraction Pilot Test Report", AGE recommended that further <br /> feasibility testing be completed at this site, and that a Problem Assessment Report(PAR)be <br /> prepared. SJC/EHD agreed with these recommendations in correspondence dated June 17, 2002, <br /> and directed the submittal of a work plan to include both the installation of the deep monitoring well <br /> and further feasibility testing. The current work plan does not address the issue of feasibility <br /> studies and/or testing. <br /> Please proceed with submittal of a San Joaquin County well permit application and with scheduling <br /> the installation of the approved well. The report of findings from the well installation can be <br /> included in the PAR,which must be submitted to SJC/EHD within 60 days following receipt of all <br /> analytical data from the investigation. <br /> If you have any questions or comments please call Lori Duncan at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Robert Marty, AGE <br />