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ENVIRONMENTAL HEALTHDEPARTMENT <br /> Donna K.HR.E.H.S. SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Direectorctor Carl Bergman,R.E.H.S. <br /> Q< �� 304 East Weber Avenue, Third Floor <br /> 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 /> • 6gC�cp6N`P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> JUN 112002 <br /> TERESA LANCTOT JERRY GREGERSON <br /> SARA LEE / EARTHGRAINS 878 MORNINGSIDE DR <br /> 8400 MARYLAND AVE STOCKTON CA 95219 <br /> ST LOUIS MO 63105 <br /> RE: Kilpatrick Bakery (former) Site Code: 2371 <br /> 1717 S. Center Street RO#: 0000110 <br /> Stockton, CA., 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> "Subsurface Site Investigation Report" dated May 14, 2002 as submitted by <br /> Philip Services Corporation on May 15, 2002 and has the following comments. <br /> Beginning on March 11, 2002, six GeoProbes, one shallow groundwater <br /> monitoring well, a vapor extraction well, and one air sparge well were installed <br /> under an approved work plan and permits issued by EHD. This report covers the <br /> soil and groundwater data collected during this field activity. <br /> Soil samples were collected from multiple depths from onsite GeoProbe borings <br /> "PH-4" and "PH-5" and from 41 feet below ground surface (' bgs) from offsite <br /> "MW-4". Low levels of petroleum contaminants were detected in the shallower <br /> depths of the onsite GeoProbes and were not detected in MW-4 at 41' bgs or <br /> from the last two, consecutive five-foot samples from the onsite GeoProbes. No <br /> soil samples were collected from the offsite vapor well ("VW-1"), the onsite air <br /> sparge well ("SP-1"), or offsite GeoProbes, "PH-6", "PH-7", or"PH-8". <br /> Groundwater samples were collected from "MW-4" and "PH-6", "PH-7", and <br /> "PH-8". Laboratory analyses indicated that low levels of petroleum were <br /> detected in MW-4 and higher levels of contamination were detected in the <br /> GeoProbe samples. <br /> A summary was included in the report and your consultant stated, `the lateral <br /> extent of petroleum impacted soil appears to be narrowly confined in the vicinity <br /> of the former UST(underground storage tank). The vertical extent of impact is <br /> evaluated to be 50 to 55 feet." EHD concurs with this conclusion, although <br /> impacted soil is not well defined toward the east. <br />