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V <br /> PUBLIt"" <br /> P <br /> HEALTH SERVICES o. . _..� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHA\NA MD-M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> c4Ci O'R��P <br /> (209) 468-3400 <br /> � _% ' <br /> JERRY MOORE J <br /> MOORE PETROLEUM <br /> POBOX 67 <br /> BANTA CA 95340 `� 2 2 1992 <br /> RE: Frank's Exxon #2 SITE CODE: 1464 <br /> 1399 E. Yosemite <br /> Manteca, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Final Remediaiton Plan" dated May 12, 1992 prepared by Aegis <br /> Environmental, Inc. for the above referenced site. <br /> PHS/EHD concurs with the plan to perform vapor and groundwater extraction at this <br /> site. Plans for groundwater extraction should not be finalized until the additional <br /> monitoring wells proposed in the April 30, 1992 work plan have been installed and the <br /> plume of groundwater contamination has been physically defined. <br /> The clean-up levels shown for soil and groundwater should be lowered. The clean-up <br /> levels listed for groundwater are State and/or Federal Primary or Proposed Secondary <br /> Maximum Contaminant Levels for drinking water. The Central Valley Region water has <br /> beneficial uses in addition to its use as drinking water. It is desirable and with todays <br /> technology achievable to require clean-up levels lower than drinking water standards. At <br /> this time PHS/EHD expects water sample results to be non-detect at the detection limits <br /> shown in the "Leaking Underground Fuel Tank Manual" (LUFT) for several quarters of <br /> sampling in order to consider a site for closure. <br /> The target concentrations listed for soil are stated to be presented in the LUFT Field <br /> Manual work sheets. Seasonal high groundwater for this site, according to San Joaquin <br /> County Flood Control Map Spring 1986, is 15 feet below ground surface (BGS). As <br /> noted in previous reports the highest concentration of BTEX and gasoline in the soil at <br /> this site are at 15 to 20 feet BGS. Work sheets in the LUFT manual are for soil <br /> contamination five feet or more above seasonal high groundwater. Clean-up levels for <br /> soil at or below seasonal high groundwater should reflect the possibility that groundwater <br /> will return to its former level and that contaminants could desorb from the soil and be <br /> released into the groundwater. <br /> A Division of Gan Joaquin County Heath Care xrvices <br />