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I <br /> GROUND ZERO ANALYSIS, INC. <br /> 2291 W March Lane, Suite 127D <br /> Stockton, California 95207 <br /> Telephone (209) 952-3481 <br /> Facsimile: (209) 952-9892 <br /> I <br /> March 19, 1996 <br /> Ms Linda Turkatte <br /> I San Joaquin County-Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> PQ Box 388 <br /> 4 Stockton, CA 95201-0388 <br /> 4 Subject First Quarter 1996 Groundwater Monitoring and Sampling Report <br /> 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 performed during the first quarter 1996 at the subject site (Figure 1) Activities <br /> during the first quarter of 1996 included monitoring groundwater elevations, purging and <br /> sampling groundwater, and analyzing samples for total petroleum hydrocarbons as gasoline <br /> (TPHg) and benzene, toluene, ethylbenzene, xylenes (BTEX) <br /> Groundwater monitoring was conducted on February 8, 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 2 36 feet since last monitored on <br /> November 8, 1995 Groundwater flow was generally easterly at gradients ranging from <br /> approximately 0 003 to 0 006 feet per foot Two groundwater gradient maps were generated <br /> r using the February 8, 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 /> Groundwater samples were collected from �%ells MW I through MW 13 on February 8 and 9, <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 'h gallon 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 presenter) in <br /> Attachment A <br /> g roue hel rock%)qm 1996 <br />