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PUBLIC1EALTH SERVICES Q�,N <br /> SAN JOAQUIN COUNTY P <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95 <br /> 209/468-3420 Ic <br /> RICHARD BOKIDES JUL 2 3 1997 <br /> 6421 W CAPITOL AVE <br /> LODI CA 95242 <br /> RE: Flag City Chevron SITE CODE: 1706 <br /> 6421 W. Capitol/Paddock Pl. <br /> Lodi, CA.. 95242 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD), has reviewed the <br /> "Work Plan Addendum -July 1997", submitted by your consultant Advanced GeoEnviron mental, Inc., and <br /> has the following comments. <br /> The proposal to place a minimum of five (5) soil probes to 15 feet below ground surface(' bgs) appears to <br /> include the historically known down-gradient areas of the groundwater plume's migration. In addition, <br /> PHS-EHD will require the following modification to the proposal. <br /> Due to the specific characteristics of MTBE, your groundwater vertical limit investigation should be <br /> expanded to include groundwater sampling at various depths in, and to the bottom, of the saturated zone. <br /> Other MTBE contaminated groundwater sites have shown that the MTBE plume tends to move outward in <br /> "fingers" away from the source four times the typical distance of the other gasoline constituents and <br /> slightly downward as it proceeds. With this in mind, PHS-EHD will require your investigation to include <br /> discreet groundwater grab samples taken from depths greater than 15' bgs and continuing downward until <br /> the lithology interpretation indicates that you have reached the lower limit of the saturated zone. <br /> With the modification that this deeper investigation be included in the recently submitted work plan, PHS- <br /> EHD approves the submittal. Please submit your boring permit application and the$89 fee by August 1, <br /> 1997. The field work should start no later than September 1, 1997. <br /> You may contact Michael Infurna, Senior REHS, at(209)468-3454 if you have any questions or wish to <br /> discuss the site. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Michael Infurna Jr., Senior REHS Mar are REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: AGE -Tim Cuellar, 1803-A March Ln., Stockton, 95207 <br /> c: SWRCB- Martin Clark- PO Box 944212, Sacramento, 94244 <br /> A Division of San Joaquin County Health Care Services <br />