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ryS.yiT ] <br />, 93W OCT1 � F� 2� 4 3 Working To Restore Nature <br /> t <br /> 1710 Main Street <br /> Fscalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 October 13, 1993 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> RE: Third Quarter 1993 Monitoring Report, Knowles Property, 1140 West Hammer Lane, <br /> Stockton, California <br /> Dear Harlin <br /> This letter report updates RESNA Industries, Inc (RESNA) activities during the third quarter <br /> of 1993 at the above referenced site (Figure 1) Activities included measuring depth to water <br /> and purging and sampling of the site groundwater monitoring wells <br /> GROUNDWATER MONITORING <br /> Groundwater monitoring was performed on August 31, 1993 The water table elevation has <br /> dropped an average of 1 57 feet since the last monitoring event in June 1993 The groundwater <br /> flow direction on August 31 was generally eastward with a hydraulic gradient ranging from <br /> approximately 0 0026 to 0 004 ft/ft. This gradient is consistent with previous monitoring <br /> events A groundwater gradient map is included as Figure 2 Monitoring data is summarized <br /> in Table 1 Monitoring data and well purge logs are contained in Attachment 1 <br /> SAMPLING METHODOLOGY <br /> Well MW-3 remained dry, all other site wells, MW-1, MW-2 and MW-4 through MW-8, were <br /> purged and sampled The groundwater samples were submitted to Sequoia Analytical (DHS <br /> Cert #1210) for analyses of total petroleum hydrocarbons as gasoline (TPHg) and benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA methods 5030/8015 and 8020, <br /> respectively Sample collection was conducted in accordance with the site Quality <br /> Assurance/Quality Control Plan (Appendix II, October 25, 1990 WorkPlan). <br /> QRTF-RLYL3QR-1993 FNL <br />