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FILE COPY <br /> PUBLIC I�ALTH SERVICES p4V�N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer .. P <br /> 4 G I F p RTS` <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> JOHN DAVIS FEB 0 2 2001 <br /> MCDOWELL & DAVIS TOWING <br /> 1360 ESCALON AVE <br /> ESCALON CA 95320 <br /> RE: McDowell & Davis Towing SITE CODE: 1486 <br /> 1360 Escalon Ave. <br /> Escalon CA 95320 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Phase 11 Groundwater Monitoring Well Installation Report" dated <br /> December 31, 2000 that was prepared by M.J. Kloberdanz&Associates (MJK) on <br /> behalf of the above referenced site and has the following comments. <br /> The report documents fieldwork that took place on November 21-22, 2000 when three <br /> groundwater monitoring wells were installed onsite. Soil samples for analysis were <br /> collected every five feet during the drilling of the boreholes, beginning at 35-feet below <br /> surface grade (bsg) in boring MW-3 and at 50-feet bsg in borings MWA and MW-2. <br /> Analytical results were non-detect for all constituents. The wells were built to 70-feet <br /> bsg to monitor the shallow groundwater. The wells were developed and sampled on <br /> November 29, 2000. Results of the analyses showed low levels, less than 13 4g/I, of <br /> petroleum hydrocarbons in each well, but were non-detect for all oxygenate additives. <br /> The report recommends that another round of groundwater monitoring and sampling be <br /> performed prior to proceeding with further investigative work at this site. PHS/EHD <br /> agrees with this recommendation. Quarterly groundwater monitoring should be initiated <br /> at this site and should continue until directed otherwise by PHS/EHD. In addition, <br /> PHS/EHD would like the wells to be resurveyed by a licensed surveyor, to City of <br /> Escalon benchmark#2. The direction of groundwater gradient as monitored on January <br /> 11, 2001 was calculated to be nearly 180 degrees opposite of the expected direction. <br /> If you have any questions or comments please call Lori Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Dot Lofstrom, R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Mike Kloberdanz, MJK <br /> A Division of San Joaquin County Health Care Services <br />