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r <br /> l� Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 Jul 1992 <br /> Phone (209)838-3507 y <br /> FAX (209)838-3509 <br /> RE kC` E I V [0" <br /> Mr Harlan Knoll A U L 13 1992 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division €NVIRONMF.NIAL HEALTH <br /> P.O Box 2009 PERIAl i/SERVIC€S <br /> Stockton, California 95201 <br /> RE: Second Quarter 1992 Monitoring Report, Knowles Property, 1140 West Hamnwr <br /> Lane, Stockton, CA. <br /> Dear Harlan <br /> This letter report updates RESNA Industries' (RESNA's) activities during the second quarter of <br /> 1992 at the above referenced site (Figure 1) Activities this quarter included measuring depth <br /> to water, purging, and sampling of the wells <br /> The field work for this investigation was performed on June 2, 1992 The water table elevation <br /> was an average of 2 4 feet lower than during the last monitoring event in March 1992 The <br /> groundwater flow direction on June 2 was generally easterly with a hydraulic gradient averaging <br /> 0 002 ft/ft This gradient is consistent with previous monitoring events. A groundwater <br /> gradient map is included as Figure 2 Monitoring data is summarized in Table 1 Monitoring <br /> data and well purge logs are contained in Attachment 1. <br /> All wells at the site, with the exception of well MW-3 which was dry, were purged and <br /> sampled The groundwater samples were submitted to RESNA Environmental Laboratory for <br /> analysis of total petroleum hydrocarbons as gasoline (TPHG) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX). Sample collection was conducted in accordance with the <br /> site Quality Assurance/Quality Control Plan (Appendix II, October 25, 1990 WorkPlan) <br /> Laboratory analysis indicates elevated levels of TPHG in the samples collected from wells MW- <br /> 1, MW-2, MW-4, and MW-5, however, the chromatograms for the samples from wells MW-1, <br /> MW-2 and MW-4 contained an unidentified peak, not matching a gasoline fingerprint Elevated <br /> levels of benzene, toluene, ethylbenzene, and xylenes, were detected in the samples collected <br /> from wells MW-1 and MW-5 Slightly elevated levels of toluene and xylenes were found in the <br /> samples collected from wells MW-2 and MW-4 All analytes for wells MW-b, MW-7 and MW- <br />'� QR061892 SAY <br />