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PUBLIC' HEALTH SERVICES <br /> SAN JOAQUIN COUNTY a '< <br /> JOG]KHANNA]Nt.D.Nt.P H. <br /> Heald'i Officer p <br /> P.O. Box 2009 a (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> -0 6* <br /> (209)468-3400 <br /> JERRY MOORE <br /> LCILO) pfJAN231992 <br /> MOORE PETROLEUM <br /> P o Box 67 <br /> BANTA CA 95340 <br /> RE: Frank's Exxon 12 IN REPLY REFER TO SITE CODE: 1464 <br /> 1399 E. Yosemite <br /> Manteca, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division has reviewed the "Problem Assessment Report" dated <br /> November 12, 1991 and the "Proposed Abandonment of Groundwater <br /> Monitoring Well" work plan dated December 26, 1991 prepared by <br /> Aegis Environmental, Inc. <br /> We concur with the assessment that the soil beneath the site <br /> contains BTEX and gasoline with the highest concentrations at <br /> depth of 15 and 20 feet below ground surface in the area of the <br /> former tank locations. <br /> The concentrations of contaminants in monitoring well one have <br /> increased each time the well has been redrilled and a larger <br /> cased monitoring well installed (1A and now 1B) . <br /> We agree that vapor/groundwater extraction and treatment is a <br /> viable remedial alternative to be investigated. <br /> In order to properly design a groundwater extraction system the <br /> extent of the plume of contaminated ground water to the east of <br /> the former tank location should be physically defined by <br /> installing a monitoring well east of monitoring well 1B. <br /> With the destruction of monitoring well #3 there will be no <br /> monitoring well northwest of the former tank location. In Aegis <br /> April and June 1991 quarterly reports the gradient was stated to <br /> be west to northwest and the "Groundwater Elevation Contour Maps" <br /> show monitoring well #3 to be the downgradient well. Monitoring <br /> well #4 is 75 feet west of the former tank location. If <br /> monitoring well #3 is destroyed it should be replaced with <br /> another monitoring well northwest of and close to the former tank <br /> location. Please consider this when planning the new building. <br /> A Division of San Joaquin County Health Care Services <br />