Laserfiche WebLink
�4 <br /> f <br /> 1 <br /> GROUND ZERO ANALYSIS, INC. <br /> D <br /> 1714 Mam Street <br /> Escalon,C"onua 95320-1927 <br /> Telephone (209)838-9888 A UG 0 3 2004 <br /> Facsvtule (209)838-9883 <br /> ENVIRONMENT FiEAL7N <br /> PERMIT/SERVICES <br /> July 30, 2004 <br /> Ms Vicky McCartney <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Semi-Annual 2004 Groundwater Monitoring and Sampling Report <br /> H&H Engineering and Construction Facility,212 Industrial Drive, Stockton, CA <br /> Dear Ms McCartney <br /> iThis letter report presents the results of the second semi-annual 2004 groundwater monitoring and <br /> sampling activities at the subject site A site location map is presented on Figure 1 <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> from all site wells Groundwater samples were analyzed for benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) A site plan showing <br /> monitoring well locations is presented on Figure 2 <br /> Fieldwork <br /> On July 12, 2004 monitoring wells MW1 through MW3 were monitored and sampled <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well and <br /> subtracting from the respective wellhead elevation Groundwater elevations at the site fell an <br /> average of 144 feet since last monitored on February 3, 2004 The average hydraulic gradient <br /> across the site was approximately 0 01 ft/ft Groundwater flowed in a northeasterly direction A <br /> potentiometric surface map generated using the July 12, 2004 groundwater data is depicted on <br /> Figure 3 Groundwater monitoring data are summarized in Table,-ft <br /> ablety <br /> nitoring data sheets are <br /> included in Attachment A <br /> Prior to sampling, monitoring wells MW1 through MW3 were purged a minimum of three well <br /> `i casing volumes During the purging process, temperature, pH and electrical conductivity <br /> parameters were measured Samples were collected after parameter stabilization, and a minimum of <br /> G 1GR0UNDZEIW-EISARI2SAR2004 doc <br />