Laserfiche WebLink
Report:Groundwater-quality Monitoring—July 14-15,2006, 7500 West Eleventh Street, Tracy, Cit. Page 15 <br /> 3.0 FUTURE GROUNDWATER-QUALITY MONITORING <br /> The proposed frequency and scope of future rounds of groundwater and potable water <br /> monitoring at the 7500 West Eleventh Street site are presented below. <br /> 3.1 Groundwater-quality Monitoring <br /> Although the MAROS analyses that was performed on the groundwater-quality data that <br /> had been accumulated for the Navarra Site through Match 2006 demonstrated that a cost- <br /> effective and statistically-rigorous future monitoring program would require recovery of <br /> samples from wells on, at most, an annual frequency, the SJCEHD directed that <br /> monitoring should continue on a semi-annual frequency (San Joaquin County <br /> Environmental Health Department 2006). Accordingly, the next round of groundwater- <br /> quality monitoring at the site is scheduled for February 2007. <br /> During �'the February round an effort will be trade to find and clear the Monitoring Well <br /> MW-2 well head so that it can again be included in the array of wells to be sampled_ With <br /> that done, depth to groundwater in all extant wells on the site will be measured and <br /> samples will be recovered from MW-3, MW-13, MW-7, MW-11, MW-14, MW-18, and <br /> MW-19 arrayed along the long axis of the principal plume, Monitoring Wells MW-2, <br /> MW-5 and MW-17 on the western fringes of that plume, Monitoring Wells MW-4, <br /> MWFP-2, MWFP-5 and MW-10 on the eastern fringes of that plume, and Monitoring <br /> Well MW-12, which is located in the secondary plume of affected groundwater on the <br /> L C, site. <br /> Each of the groundwater samples recovered will be analyzed for the following <br /> suite of analytes. <br /> Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 8015M <br /> (quantified as Diesel) with pre-treatment by <br /> EPA Method 3630. <br /> Total Petroleum Hydrocarbons EPA Method 8260B <br /> (quantified as Gasoline) <br /> Benzene EPA Method 8260B <br /> Toluene EPA Method 8260B <br /> Ethyl benzene EPA Method 8260B <br /> Total Xylene Isomers EPA Method 8260B <br /> Tertiary-butyl alcohol EPA Method 8260B <br /> Methyl-tertiary butyl ether EPA Method 8260B <br /> sic <br />