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GROUND ZERO ANALYSIS, INC. <br /> 2291 W March Lane, Suite 127D <br /> 't <br /> Stockton, California 95207 <br /> Telephone: (209) 952-3481 <br /> Facsimde. (209) 952-9892 <br /> I ' <br /> I May 21, 1996 <br /> Ms Linda Turkatte <br /> San Joaquin County-Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Second Quarter 1996 Groundwater Monitoring and Sampling Report <br /> p Knowles/Roek Property, 102 South Wilson Way, Stockton, California <br /> Dear Ms Turkatte <br /> ` Ground Zero Analysis, Inc (Ground Zero) has prepared this report for groundwater monitoring <br /> and sampling performer) during the second quarter 1996 at the subject site (Figure 1) Activities <br /> during the second quarter of 1996 included monitoring groundwater elevations, purging and <br /> sampling groundwater, and analyzing samples for total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tert-butyl ether (MTBE) <br /> V Groundwater monitoring was conducted on April 24, 1996 The depth to groundwater was <br /> measured in each well and subtracted from the wellhead elevation to determine groundwater <br /> elevation Water levels in the wells rose an average of 3 04 feet since last monitored on <br /> February 8, 1996 Groundwater flow was generally easterly at gradients ranging from <br /> approximately 0 002 to 0 01 feet per foot Two groundwater gradient maps were generated <br /> using the April 24, 1996 monitoring data The gradient determined using wells shallower than <br /> 65 feet is shown on Figure 2, and the gradient using data from wells deeper than 65 feet is <br /> depicted on Figure 3 Recent groundwater monitoring data are summarized in Table 1 <br /> Monitoring logs are included in Attachment A <br /> f <br /> Groundwater samples were collected from wells MW 1 through MW 13 on April 24 and 25, <br /> 1996 At least three well casing volumes were purged from wells MW-1 through MW-13 prior <br /> to sampling, except for MW-3 which went dry after purging 21/2 gallons Physical parameters <br /> (pH, conductivity, temperature) were monitored during purging and allowed to stabilize prior <br /> to sampling Purged water was contained in 55-gallon drums approved by the Department of <br /> Transportation and remains on site pending analytical results Purge logs are presented in <br /> Attachment A <br /> E <br /> �rc7unJn'rock ?ym29Uh <br />