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LI r1 Working To Restore Nature 1710 Main Street Escalon, CA 95320 \ L Phone (209) 838-3507C FAX (209) 838-3509 January 28, 1993 Mr. Harlin Knoll "�1 E 0 San Joaquin County Public Health Services RE1%'9 Environmental Health Division JAN 2 9 M3 P.O. Box 2009 ENVIRONMEN rAL HEALTH Stockton, California 95201 PERMIT/SERVICES RE: Fourth Quarter 1992 Monitoring Report, Knowles Property, 1140 West Hammer Lane, Stockton, CA Dear Harlin. This letter report updates RESNA Industries' (RESNA's) activities during the fourth quarter of 1992 at the above referenced site (Figure 1). Activities this quarter included measuring depth to water, purging, and sampling of the wells Groundw t r Monitorin The field work for this investigation was performed on December 15, 1992. The water table elevation has risen an average of 19 feet since the last monitoring event in September 1992. The groundwater flow direction on December 15 was generally easterly with a hydraulic gradient averaging 0 002 ft/ft. This gradient is consistent with previous monitoring events. A groundwater gradient map is included as Figure 2. Monitonng data is summarized in Table 1 Monitoring data and well purge logs are contained in Attachment 1. Sampling Methodology Well MW-3 was dry, all other wells at the site, MW-1, MW-2 and MW-4 through MW-8 were purged and sampled The groundwater samples were submitted to RESNA Environmental Laboratory for analysis of total petroleum hydrocarbons as gasoline (TPHG) and benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA methods 5030/8015 and 8020, respectively Sample collection was conducted in accordance with the site Quality Assurance/Quality Control Plan (Appendix II, October 25, 1990 WorkPlan) QRTERLYAQR011593 FNL