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1 <br /> GROUND ZERO ANALYSIS, INC. <br /> 1 , <br /> • 1714 Main Street <br /> Escalon, California 95320 - <br /> Telephone: (209) 838-9888 <br /> n� <br /> Facsimile: (209)83$-9$83 Z,c/ Din. <br /> October 6, 2005 pv? jjU;ElVI�Fq[co <br /> rj� <br /> r <br /> Mr. Nuel Henderson <br /> ' San Joaquin County Environmental Health Department <br /> 304 E. Weber Ave., 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Third Quarter 2005 Groundwater Sampling Report <br /> P g P <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 /> conducted at the subject site during the third quarter of 2005. Groundwater related activities <br /> included monitoring groundwater elevations in all site wells and sampling groundwater from <br /> select site wells. <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 (RIPE), tert-amyl methyl ether (TAME) and tert- <br /> butyl alcohol (TBA)I. <br /> ' The soil vapor extractions stem only operated for a brief period during the quarter. <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> ' Depth to groundwater was measured on August 17, 2005 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 rose an average of 0.10 feet since the second quarter event in May 2005. The <br /> potentiometric surface was above the top of the screened intervals in monitoring wells MW4 <br /> ' G:IGROUND7.EIROEKIQMR12005L3gm2005.dne <br />