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MjgA�' RECEIV u Working To Restore Nature 1710 Main Street APR 12 1993 PhoneEscalo (20099) 838-3507 n95320 ENVIRONMENTAL HEALTH Phone ( FAX (209) 838-3509 PERMIT/SERVICES April 8, 1993 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, California 95201 RE First Quarter 1993 Monitoring Report, Knowles Property, 1140 West Hammer Lane, Stockton, CA. Dear Harlin . This letter report updates RESNA Industnes' (RESNA's) activities during the first quarter of 1993 at the above referenced site (Figure 1) Activities this quarter included measuring depth to water, purging, and sampling of the wells Groundwater Monitoriniz Groundwater monitoring was performed on March 12, 1993 The water table elevation has risen an average of 3 23 feet since December 1992 The groundwater flow direction on March 12 was generally easterly with a hydraulic gradient averaging 0 0027 ft/ft or approximately 14 ft/mile An anomalous groundwater low is noted in the vicinity of MW 1 This gradient is consistent with previous monitoring events A groundwater gradient map is included as Figure 2 Monitoring 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 Il, October 25, 1990 WorkPlan) QRTBRLYIiQR 1993 FNL V`