Laserfiche WebLink
i <br /> I <br /> GROUND ZERO ANALYSIS, WC <br /> 2291 W. Mareb Lane, Suite 127D � <br /> Stockton, California 95247 <br /> Telephone: (209) 952-3481 <br /> Fwsunde: (249) 952-9892 <br /> I <br /> June 9, 1997 <br /> Ms Linda Turkatte <br /> San Joaquin County-Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> P 0 Box 388 <br /> Stockton, CA 95201-0388 <br /> i <br /> Subject Second Quarter 1997 Groundwater Monitoring and Sampling Report <br /> Knowles/Roek Property, 102 South Wilson Way, Stockton, California <br /> Bear Ms Turkatte <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report for groundwater monitoring <br /> and sampling performed during the second quaxter 1997 at the subject site (Figure 1) Activities <br /> included monitoring groundwater elevations, purging and sampling groundwater, and analyzing <br /> samples for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX) <br /> Groundwater monitoring was conducted on May 7, 1997 The depth to groundwater was <br /> measured in each well and subtracted from the wellhead elevation to determine groundwater <br /> elevation Water levels rose an average of 2 44 feet since last monitored on February 5, 1997 <br /> Groundwater flow was generally east--southeasterly at an average gradient of approximately <br /> 0 002 - 0 003 feet per foot A groundwater gradient map generated using the May 7, 1997 <br /> monitoring data is shown on Figure 2 Recent groundwater monitoring data are summarized in <br /> Table 1 Monitoring logs are included in Attachment A <br /> Ground Zero collected groundwater samples from wells MW1 through MW13 on May 7 and 8, <br /> 1997 At least three well casing volumes were purged from each well prior to sampling <br /> Physical parameters (pH, conductivity, temperature) were monitored during purging and allowed <br /> to stabilize prior to sampling Purged water was contained in 55-gallon drums approved by the <br /> Department of Transportation and remains on site pending analytical results Purge logs are <br /> presented in Attachment A <br /> Samples were placed on ice and transported under chain of custody to Argon Laboratories (DHS <br /> #1873) where they were analyzed for BTEX and TPHg using EPA methods 8020 and modified <br /> 8015, respectively Recent analytical results of groundwater samples are summarized in Table <br /> 2 Attachment B contains laboratory reports and chain of custody documentation <br /> rr.Ugmrl2gmi 997 <br />