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Mabel Keir <br /> Page 2 <br /> EHD does not believe that this work plan adequately assesses the lateral and vertical <br /> contamination at this site for the following reasons. On August 20, 2003, Advanced <br /> GeoEnviromnental, Inc. (AGE) advanced a soil boring adjacent to the former UST/dispenser <br /> area to a depth of 30 feet bsg and collected a grab groundwater sample at total depth. <br /> Analytical results indicate that high concentrations of petroleum hydrocarbons were found in <br /> the soil sample collected at 25 feet bsg, and in the groundwater samples collected at <br /> approximately 30 feet bsg. To advance a boring to approximately 20 feet bsg at the former <br /> UST site will not provide additional soil and groundwater information. <br /> Please resubmit a work plan that will assess the lateral and vertical contamination of soil and <br /> groundwater at this site. Include a map showing the locations for proposed borings in <br /> relationship to the former UST site. At least one soil boring should be continuously cored to <br /> characterize the soil lithology; and add 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane <br /> (EDB)to the analyte list. Please ensure the reporting limits for 1,2-DCA and EDB are at <br /> least 0.5 micrograms per liter(µg/L) in groundwater, if possible. <br /> A site-specific health and safety plan(HASP)must be submitted to EHD prior to <br /> commencement of the fieldwork. This HASP must be available on site during the,field <br /> activities. Also, follow the San Joaquin County Public Health Services Environmental <br /> Health Division Well Standards when grouting soil borings. <br /> Please submit the revised work plan to EHD by August 16, 2004. If you have any questions <br /> regarding this letter,please contact Vicki McCartney at (209) 468-3456 or by electronic mail <br /> at vmccartney@sjcehd.com. <br /> Donna Heran,REHS, Director <br /> Environmental Health Department i ^ <br /> Victoria McCartney,RE Margaret Lagorio, REHS <br /> LOP/SiteMitigation Unit IV Supervisor/LOP/SiteMitigation Unit IV <br /> cc: Kathy L. Monday,Damrell Nelson Schrimp Pallios Pacher & Silva Attorneys <br /> James L.L. Barton, CVRWQCB <br />