ARCHIVED REPORTS_XR0012631 - Laserfiche WebLink

Home Browse Search

I 7--Eleven/Stockton 13 October 1.988 monitcring wells and pumping wells without free product: twice a month. DDr:estiC wells 9160, Tomato Growers (TMG) , 1927, 1912 and 8968: twice a month. • Domestic wells 9140, 9159, 9156, 9.160; 9167, and Ivy Motel: monthly. The results of the laboratory analyses of the groundwater samples for the reporting period are summarized in Table 2 of Appendix I. The laboratory reports and method detection limits (MDL) for the BTEX and TPfl-as--gasoline analyses performed are presented in Appendix III. Dissolved Plume. Maps (Figures 9, 10, 11, 12, 13 and 14) were constructed using the laboratory tc:;t data for the water samples collected from the monitoring and pumping wells on selected dates during this reporting period. Although minor concentrations of BTEX and TPH-as-gasoline were detected on occasicn in some of the sampled domestic wells, W., the concentrations Have generally remained below the laboratory MDL. The only concentration above Department of Health sarvices r.. drinking water standards was on July 27, 1988 when 1.0 part per .� Billion (ppb) benzene was detected in the sample from well TMG. i Following each sampling event where minor hydrocarbon concentrations were detected, the following sample round showed �. non-detectable hydrocarbon levels. Due to the inconsistent detection of hydrocarbons and the location of some of the wells �r that had hydrocarbons detected (upgradient and crossgradient) the minor numbers recorded are likely due to external sources during sampling or in the laboratory during analysis. i The results of the laboratory analyses performed on the water samples obtained from the monitoring and pumping wells indicate the highest dissolved contamination levels to be in the GxoUNDWATER TECHNOLOGY,INC. r