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PUBLI ' SERVICESHEALTH <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 0 Stockton,California 95201 <br /> (209)468-3400 <br /> cc <br /> MARY LEHR <br /> 1250 EDGEWOOD DRIVE <br /> LODI CA 95240 JUN�� 1 1�g <br /> RE: Arts and Artists SITE CODE: 2423 <br /> 204 East Lodi Ave <br /> Lodi CA 95240 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> completed review of the "Groundwater Assessment and Quarterly Monitoring Report" <br /> prepared by Geological Audit and which PHS/EHD received on June 2, 1993. PHS/EHD <br /> has prepared the following comments for your consideration. <br /> Three monitoring wells, MW6 - MW8, were installed in April 1993, in order to determine <br /> the extent of groundwater contamination. Soil contamination was not detected during the <br /> installation of these wells. Groundwater contamination was not detected in the samples <br /> collected from these wells on April 27, 1993. <br /> Groundwater contamination continues to be evidenced as indicated in samples collected <br /> April 27, 1993 for laboratory analysis from MWI, MW4, and MW5. While MW3 was not <br /> sampled on April 27, 1993, subjective evaluation on March 23, 1993 indicated odors <br /> associated with petroleum hydrocarbon contamination. Furthermore,based on groundwater <br /> elevation evaluations, MW3 should have contained sufficient groundwater to sample. <br /> PHS/EHD concurs that both soil and groundwater remediation will be necessary. Soil <br /> contamination is documented from 9 feet to 50 feet below ground surface. The horizontal <br /> extent of soil contamination is unknown. The extent of groundwater contamination has been <br /> established by the results from the recently installed monitoring wells. <br /> Please submit by July 23, 1993 a work plan addendum for the installation of a vapor <br /> extraction well to assess the viability of vapor extraction as a soil remediation method. Once <br /> the vapor extraction well has been installed, all the monitoring wells sampled again, and a <br /> groundwater pump test performed using MW 1, a "Problem Assessment Report" should be <br /> submitted by October 1, 1993 evaluating remedial alternatives. <br /> A Division of San Joaquin County Health rare Services 0 <br />