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iF <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ?.t <br /> JOGI KHANNA M.D..M.P.H. .=.. <br /> Healrh Officer <br /> • 16o I East Hazetton Avenue • Stockton,California 95201 <br /> P.O. Box 2009 { ) <br /> (209)468-3400 <br /> MARY LEHR ply <br /> 1250 EDGEWOOD DRIVE SIP 1 51992 <br /> LODI CA 95240 <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) <br /> has completed review of the "Monitoring Well Installation Report" dated August 5, 1992 <br /> prepared by Geological Audit Services. PHS/EHD has the following continents for your <br /> consideration. <br /> On June 22 and 23, 1992 two monitoring wells, MW4 and MW5, were installed to further <br /> investigate groundwater and/or soil contamination. Soil contamination was not detected <br /> in samples which underwent analysis. However, groundwater contamination was detected <br /> both in MW4 (19 ppb benzene, 5.1 ppb toluene, 1.2 ppb ethylbenzene, 11 ppb xylene, <br /> and 300 ppb TPH) and in MW5 (9.6 ppb TPH). Please submit laboratory quality <br /> assurance/quality control data sheets to verify that the reported laboratory results are <br /> accurate. <br /> The reported groundwater gradient direction has changed from the north - northeast to <br /> the northwest. This change is concluded to have resulted from the discontinuance of the <br /> operation of City of Lodi Municipal Well #1. <br /> PHS/EHD concurs with the recommendation to install additional monitoring wells to <br /> define the extent of groundwater contamination. Two monitoring wells were proposed to <br /> be located northwest of the building and southwest of MW5, to define the boundaries of <br /> contamination. <br /> PHS/EHD does not agree that the wells proposed will adequately define the extent of <br /> groundwater contamination. Groundwater contamination has not been defined northeast <br /> of MW4 or southeast of MW3. While it is true that the City of Lodi Municipal Well #1 <br /> is no longer influencing the gradient, there is no indication that groundwater <br /> contamination did not migrate beyond MW4. Furthermore, prior to MW3 having gone <br /> dry, significant groundwater contamination was detected, 2800 ppb benzene, 230 ppb <br /> toluene, 2500 ppb xylene, 360 ppb ethylbenzene, and 14000 ppb TPH. Additional <br /> groundwater investigation will be necessary to adequately define the extent of <br /> groundwater contamination. Please submit a work plan, proposing the additional <br /> investigation, by November 16, 1992. <br /> A Division of San Joaquin Counry Health :are Servicra <br />