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II <br /> I I s <br /> t I <br /> �•� °� ► Lodi Groundwater Assessment <br /> .ones ` <br /> , <br />' ek Fact Sheet No. 1 <br /> y <br /> �t Fos ,, California Environmental Protection Agency October 1993 <br /> Department of Toxic Substances Control <br /> SOIL GAS AND GROUNDWATER SAMPLING TO BEGIN IN NOVEMBER <br /> I <br /> INTROL)UCTION used as a solvent and degreaser in the metal <br />' finishing industry PCE and TCE have been <br /> The California Department of Toxic found to cause cancer in laboratory animals <br /> Substances Control (DTSC) is conducting an and are suspected human carcinogens <br />' investigation into chemical contamination of <br /> groundwater in the Lodi area This fact sheet For the two City drinking water supply wells <br /> is to provide you with an overview of the that were closed, the table below shows the <br />' groundwater contamination problem and range of the VOC concentrations detected <br /> discuss the planned investigation that is and the MCLs for TCE and PCE in parts per <br /> underway Throughout this fact sheet, words billion (ppb)- <br /> or phrases in italicized type are defined in the <br /> Glossary on Page 4 <br /> Crouandwater Contaminant Concentrations <br /> C0NTAMI NATION - AN 0VUIVILIV i Well Sample Concentration MCis <br /> No. Date <br />' Contamination of the groundwater beneath <br /> the City of Lodi by "volatile organic com- <br /> pounds <br /> orn- CW 3 1989-93 TCE ND*-17[1 ppb 5 ppb <br /> pounds" (VOC) was first detected in 1989 ME <br /> o <br /> VOCs are a carbon organic compound that0-5-2m ppb Sppb <br /> evaporates at room temperature CW4 1990-93 TCE 5.8-12 ppb 5 ppb <br />' Tlie City of Lodi operates 22 public water "ND-Non Detect <br /> supply wells VOCs were found during <br /> sampling of public water supply wells The extent of the contamination is not yet <br />' Subsequent samples were taken by the City }mown. A preliminary search for possible <br /> to confirm the discovery AS of today, two <br /> City drinking water supply wells (CW3 and sources of contamination was conducted <br />' CW4, see map on following page) have been during 1989 through 1991 by the Regional <br /> found to contain concentrations of the VOCs Water Quality Control Board {RWQCB) This <br /> perchloroethylene (PCE) and trichloro- search identified some potential sources for <br />' the PCE contamination but was inconclusive <br /> ethylene (TCE) above the State Maximum <br /> Contaminant Levels (MCLS) and have been for the TCE contamination <br /> taken out of service. VOCs below the MCLS <br /> have also been detected in two other wells <br /> (CW2 and CW24) PCE is primarily used as a DTSC is the lead agency in the investigation <br /> solvent in the dry cleaning industry TCE is of the VOC contamination DISC will <br /> Pnnted on Recycled Paper October 1993 <br /> 1 <br />