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M w l 3,3 T O Q4 <br /> D <br /> 794 <br /> GROUND ZERO ANALYSIS, INC. „7 J <br /> 1714 Mam Street <br /> Escalon, California 95320 <br /> Telephone (209) 838-9888 <br /> Facsimile (209) 838-9883 <br /> L 1 <br /> JUL 2 2 2003 <br /> July 21, 2003 <br /> ENV1RuViv1ENT HEALTH <br /> PERMIT/SERVICES <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 Second Quarter 2003 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> I <br /> Dear Mr Henderson <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork conducted <br /> at the subject site during the second quarter of 2003 Groundwater related activities included <br /> monitoring groundwater elevations in all site wells, sampling groundwater from monitoring wells <br /> MW3 through MW6, MWS, MW 10, MW 11 and MW 13B through MW 16B, and sampling <br /> groundwater from 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 dibromide <br /> (EDB), and gasoline oxygenate additives [methyl-tert-butyl ether (MTBE), ethyl-tert-butyl ether <br /> (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME) and tent-butyl alcohol (TBA)] <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on May 28, 2003 in monitoring wells MW 1 through MW 16B <br /> and in vapor wells VW 1 through VW6 Depth to groundwater was then subtracted from each <br /> respective wellhead elevation to determine groundwater elevation Water levels at the site rose <br /> approximately 0 61 feet since the first quarterly event (February 19, 2003) The potentiometric <br /> surface was above the top of the screened intervals in monitoring wells MW4 through MW 13B, <br /> MW15B, MW15C, MW16B and vapor wells VW1 and VW4 Vapor wells VW2 and VW5 were dry <br /> Groundwater flowed in an east-northeasterly direction The average gradient across the site was <br /> approximately 0 002 feet per foot <br /> G 1GROUNbZE1ROEKIQMR1200312gm2003 doe <br /> I <br />