ARCHIVED REPORTS XR0011757 - Laserfiche WebLink

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.� 7500 West Eleventh Street, Tracy, C,4. Page 3 Repan:Groundwater-quality Monitoring—June 23-28,X005, � les from a reduced Joaquin Company 2004e, 2003c, 2003b) included a recovery ui Co Environmental wells at the direction of the San Joaquin les were taken are those 4 number of monitoring The wells from which those samples and secondary Health Division (SJCEHD). Primary t were located in the most severely-affected m the of e he p that plumes of contaminated groundwater emanating from C ,t round was conducted on April 21, 22 and 30, 2004, when The fourteenth monitoring p wells and the seven new groundwater samples were recovered from the 15 re-existingJoaquin wells installed in that month (The San product monitoring groundwater-quality monitoring 2004d). (Note.. As is discussed in Section Figure below,, were nstalledpn April 2004, but wells, the locations of which are shown on Figur of recovered from them until March 2005•) ThelflWells, and `( groundwater samples were n groundwater-quality monitoring sixteenth monitoring rounds included all 22 gr The San Joaquin were conducted on July 26-27 and October 27-28, 2004, respectively 2004b, c). Company s seventeenth quarterly monitoring round was conducted at the 7500 W erformed in The t Eleventh leve 24-March 16, 2005. That round, p Street site over the period February progress of natural attenuation at the Navarra 1'1 conjunction with a formal evaluation of the nd ter from each of the 22 groundwater- Site included recovery Of samples of gr wells g wells and the five floating product monitoring The San Joaquin quality monitorin Company 2006). y quarterly monitoring round, which was conducted This report documents the eighteenth in June 2005. 1.3.3 Monitorin of LNAPL V -x ro am of monitoring the thickness of light This report also includes records from a p roduct, in an array of five hale li uid (LNAPL), present as floating p ualit monitoring non-aqueous p q oundwater-q Y floating product monitoring wells and three selected gr =s. wells. When groundwater was first recovered from groundwater When monitoring well MW-7 11 2000, the saons of Total Petroleum mple contained moderate coniHYd Hydrocarbons quantified on May F= toluene, ethyl r Hydrocarbons quantified as diesel (TPHd) and TotaPetroleum as gasoline (TPHg), with comme urate concentrations d ben o f in benzene and total xylene isomers (the BTEX componds} and 22 1�g� :., the concentration of components of F<= (MTBE) a fuel ox genate. Thereafter, yt butyl ether y ed an increasing trend until the analytes of concern exceeded i fuel hydrocbons follow However, as early as the sampling 4 their maximi solubility in water (see Table 2). les recovered from performed on No 28, 2000,no MTBE was detected in the e that, that time, the .. Well MW-7. It is believed that this does not T IndicRatherai indicates that the Monitoring _ groundwater in the vicinity of that well was free ofas to raise the such tions of other components of fuel hydrocarbons eater than the concentration of high Concentra method detection limit of the MTBE analysis to a level greater :a • sic �r� k. _— --"T". - �:_ -.•ill-' '-- � --.s•{�/ffl/fffi --i '.r1�(//1��