Laserfiche WebLink
i <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> E,scaton, California 95320-1927 <br /> Telephone (209)83$-9888 <br /> Facsimile (209)838-9883 v <br /> July 24,2002 JUL 2 g 2002 <br /> Michael ENVIRONMENT HEALTH <br /> Mr ima PERMIT/SERVICESSan Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2002 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart <br /> 2662 N Wilson Way, Stockton, CA(Site Code 13 06) <br /> Dear Mr h firma <br /> This letter report presents the results of the second quarter 2002 groundwater monitoring and sampling activities <br /> at the subject site(Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations, and purging and sampling groundwater from <br /> site wells and U-Haul well MW7 Samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, 1,2- <br /> dichloroethane(1,2-DCA), and ethylene dibromide(EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On June 27, 2002, water levels in wells MWl through MW4 and U-Haul well MW7 were monitored <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each site well and <br /> subtracting the depths from the respective wellhead elevations Depth to water in the wells ranged from 53 15 <br /> to 54 79 feet below ground surface (bgs), and the potentiometric surface elevation ranged from 35 32 to 35 45 <br /> feet below mean sea level Groundwater fell an average of 5 61 feet since last measured on March 15 2002 <br /> The hydraulic gradient at the site was essentially flat(�0 001 ft/ft or 5 ft/nule) Flow direction appeared to be <br /> toward the northwest A potentiometnc surface map generated using the June 27, 2002 monitoring data is <br /> shown on Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are <br /> included in Attachment A <br /> Wells MWl through MW4 and U-Haul well MW7 were purged and sampled on June 27, 2002 Each well <br /> was purged of at least three well casing volumes, except for well MWI, which went dry During the purging <br /> process, temperature, pH and electrical conductivity parameters were measured Groundwater samples were <br /> 11CZA_FSVSYS011Data1GROUNDZBIHARRYSaeportslQMR1200212QM2002 doc <br />