ARCHIVED REPORTS XR0009938 - Laserfiche WebLink

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Quarterly Report - 152 East 11th Street, Tracy Page 3 Each groundwater sample was analyzed by Chromalab Inc for the following suite of analytes Total Petroleum Hydrocarbons as gasoline by EPA Method 5030/8015, Benzene, Toluene, Ethylbenzene and Total Xylenes (BTEX) by EPA Method 602, Ethanol by EPA Method 8015, Conductivity by Standard Method 110 1, and pH by EPA Method 9040 Chromalab Inc is certified by the State of California to conduct these analyses During the progress of the analysis, the laboratory encountered a quality control problem and requested additional samples Accordingly, each of the wells was resampled on January 22nd and samples were again recovered from wells NAV 3 and NAV 4 on February 3rd 1993 These supplementary samples were successfully analyzed in compliance with the laboratory's quality control procedures Copies of the Certificates of Analysis issued by the laboratory, together with a copy of the chain-of-custody and request-for-analysis form are attached as Appendix A The results of the sample analyses for petroleum hydrocarbon components are summarized in Table 2 No Ethanol was detected in any of the samples STATUS REPORT . The results of the groundwater sampling and analysis reported herem complete the scheduled groundwater monitoring activists for the subject site for the first quarter of 1993 Work in Progress As requested by the San Joaquin County Public Health Services, Environmental Health Division, preparation of a workplan to further evaluate the extent to which soil and groundwater has been affected by releases of hydrocarbons at this site is currently in progress Proposed action will be based on evaluation of existing data from the borings and monitoring wells that have been installed on the subject property together with similar information from Ultramar Inc 's site at 153 East 11th Street, and other sites in the vicinity at which petroleum products are known to have leaked into the underground Records related to applicable sites have been obtained from San Joaquin County and Ultramar Inc (see below) This data will be used as the basis for an evaluation the likely extent to which soil and groundwater at the site has been affected by releases of petroleum products from on- or off-site sources and to assess the scope of any additional investigative effort that may be required Exchange of Data with Ultramar Inc Ultramar Inc has been contacted with respect to an exchange of data related to the sites at 153 East 11th Street They have provided a copy of the quarterly groundwater monitoring report for that site for the first quarter of 1992 It provides the results of a round of groundwater sampling from wells installed on and around their property that was conducted by Environmental Geotechnical Consultants on March 28, 1992