Laserfiche WebLink
f <br /> The groundwater samples, from each well , were collected in three, <br /> laboratory certified 40 ml pre-cleaned glass VOAs, with Teflon <br /> septa and labelled. The 40 ml glass VOAs were stored and <br /> transported in a cooler, with ice, and Chain of Custody <br /> documentation to MCCAMPBELL ANALYTICAL INC. , a California State <br /> Certified Laboratory, in Pacheco, CA. <br /> ANALYTICAL RESULTS <br /> The analytical methods are those required in the "Tri-Regional <br /> Guidelines" which are directives of the Regional Water Quality <br /> Control Board and required by the SJCEHD. <br /> The analyses completed were for Total Petroleum Hydrocarbons, as <br /> gasoline (TPHG) ; Benzene, Toluene, Ethylbenzene and Xylene (BTEX) <br /> via EPA Modified Method 8020/8015 and for the Oxygenates using <br /> the EPA Method 8260. As requested, all the monitoring well <br /> groundwater samples as well as the "potable well" water were <br /> analyzed by EPA Method 8260.524. 2. <br /> The "potable well" water analysis indicated that no detectable <br /> concentrations of TPHG, BTEX or Oxygenates were contained in the <br /> water from this Well. <br /> A cumulative Table to show groundwater fluctuations and the <br /> comparative results for the concentrations of the Oxygenates, <br /> TPHG and BTEX, in the four monitoring wells, are contained in <br /> TABLE 2 . <br /> The analytical results, for the last two quarterly events of the <br /> groundwater sampling from the Monitoring wells, identified as MW- <br /> 1 , MW-2, MW-3 and MW-BT in ug/L, i.e. parts per billion (ppb) , <br /> for Oxygenates, TPHG and BTEX are shown in Table 2 . <br /> The Laboratory Data Sheets, along with detection limits, and <br /> Chain of Custody documentation are contained in Appendix B. <br /> WELL SURVEY <br /> Well information was requested from the City of Tracy, SJCEHD and <br /> the California State Water Resources Board. A physical survey <br /> was also conducted. <br /> The information for the wells located within a 2,000 foot radius <br /> of the former UST area is shown in Figure 4. Appendix C contains <br /> monitoring well data for sites which have monitoring wells. <br /> Table 3 contains well location and available data. <br /> 3 <br />