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PUBL?C HEALTH SER ICES <br /> SAN JOAQUIN COUNTY t' <br /> JOG[KHANNA M.D.,M.P.H. <br /> Healrh Officer P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,Caftmia 95201 <br /> (209) 468-3400 <br /> t�J <br /> { STEVE KEETER <br /> { SAN JOAQUIN COUNTY CAPITOL PROJECTS <br /> 222 EAST WEBER ROOM 678 MAY 14 1992 <br /> STOCKTON CA 95202 <br /> RE: 500 Hospital Road SITE CODE: 1614 <br /> French Camp, CA <br /> i <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Soil Assessment Report" dated December 6, 1992, submitted by <br /> i <br /> Kleinfelder and has the following comments. <br /> 1 San Joaquin County Flood Control Maps (Spring 1986) record the seasonal high <br /> groundwater for this site at approximately 10 to 15 feet below ground surface (BGS). <br /> The sail sample results from the borings underneath the two 750 gallon underground <br /> storage tanks (T2, T3) show soil contamination at 15 and 18 feet BGS. Due to the <br /> proximity of the contamination to the seasonal high groundwater, a groundwater <br /> investigation for this site is warranted. A minimum of three monitoring wells will need to <br /> be installed in order to determine the groundwater gradient direction for this site. <br /> F Additional soil borings/monitoring wells may need to be drilled to determined the full <br /> extent of the soil and/or groundwater contaminant plume(s). <br /> E <br /> It is understood that the work at this site is on hold pending the demolition of the <br /> structures over the tanks and the destruction of the domestic well located nearby, <br /> 1 allowing for easier access to remove the tanks and to conduct an investigation. <br /> Domestic wells located on or near a contaminated site need to be destroyed in such a <br /> a way as to prevent the vertical migration of contamination. The method used to destroy <br /> i the well should be dependent on the original construction specifications, if known, and <br /> the current condition of the well: The well may be video taped to determine if the casing <br />' has deteriorated which would have allowed contamination to enter the casing and move <br /> I vertically down to a deeper aquifer. The well should be sounded for total depth and the <br /> static water level should be measured. A water sample should be obtained from the well <br /> and analyzed for total petroleum hydrocarbons as diesel and gasoline, benzene, toluene, <br /> ethylbenzene and xylene. The information gathered from the construction details, the <br /> well measurements and the analytical results of the sampling should should be used to <br /> determine the well destruction specifications. <br /> A Division of San Joaquin Counry Hcakh Care Serdices �� <br />