Laserfiche WebLink
GRWND ZERO ANALYSIS, INC. <br /> • 1714 Main Street <br /> Ewalon, California 95320 Q 1 a 2004 Telephone: (209) 838-9888 <br /> Facsimile: (209) 838-9883 <br /> EfJVIC,u:'�i�Y,Lil I HLEUH <br /> PERNIMSERVICES <br /> 1 <br /> December 9, 2004 <br /> 1 <br /> Mr. Nuel Henderson <br /> ' San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Ave., 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Fourth Quarter 2004 Groundwater Sampling Report <br /> ' 102 South Wilson Way, Stockton, California (Figure 1) <br /> ' Dear Mr. Henderson: <br /> Ground Zero Analysis, Inc. (Ground Zero) has prepared this report to summarize fieldwork <br /> conductcd at the subject site during the fourth quarter of 2004. Groundwater related activities <br /> included monitoring groundwater elevations in all site wells; sampling groundwater from <br /> ' monitoring wells MW3 through MW6, MWS, MW10, MW11, and MW13B though MW1613; <br /> and vapor wells VW4 and VW6. <br /> ' Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene <br /> dibromide (EDB), and gasoline oxygenate additives [methyl-tent-butyl ether (MTBE), ethyl- <br /> ' tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME) and tert- <br /> butyl alcohol (TBA)I. <br /> ' The soil vapor extraction system was not in operation during the quarter. <br /> ' GROUNDWATER ACTIVITIES <br /> ' Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on November 16, 2004 in monitoring wells MW 1 through <br /> ' MW16B and in vapor wells VW1 through VW6. Depth to groundwater was then subtracted <br /> from each respective wellhead elevation to determine groundwater elevation. Water levels at <br /> • the site fell an average of 1.13 feet since the third quarter event in August 2004. The <br /> 11GZA_FSIVOL.31DATA1GROUNDZ.EIROEKIOMR1200414gm2004.doc <br />