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;I <br /> /�W -� A <br /> Working to Restore Nature <br /> 1710 Main Street C(OPY <br /> Escalon,CA 95320 May 4, 1992 <br /> Phone (209) 838-3507 <br /> FAX (209)838-3509 — <br /> E� <br /> 1b L f Z fL,",, <br /> Mr. Harlan Knoll MAY 6 1992 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division ENVIRONMN�r3 HF� T� <br /> P.O. Box 2009 � M�T/ ViCS <br /> Stockton, California 95201 <br /> RE: First Quarter 1992 Monitoring Report, Knowles Property, 1140 West Hammer <br /> Lane, Stockton, CA. <br /> Dear Harlan: <br /> This letter report updates RESNA Industries' (RESNA's) activities during the first 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 March 16, 1992 The water table <br /> elevation was an average of 3 3 feet higher than during the last monitoring event in June 1991. <br /> The groundwater flow direction on March 16 was generally easterly with a hydraulic gradient <br /> averaging 0 002 ft/ft. This gradient is consistent with previous monitoring events. A <br /> groundwater gradient map is included as Figure 2 Monitoring data is summarized in Table 1. <br /> Monitoring 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 and other low-boiling point compounds <br /> in the samples collected from wells MW-1, MW-2, MW-4, and MW-5; the chromatograms for <br /> the samples from wells MW-2 and MW-4, however, did not match a gasoline fingerprint <br /> Elevated levels of benzene, toluene, ethylbenzene, and xylenes, were detected in the samples <br /> collected from wells MW-1 and MW-5. All analytes for wells MW-7 and MW-8 were <br /> nondetectable The laboratory results are summarized in Table 2 The laboratory data sheets, <br /> QR041792 SAY <br />