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• 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 r Nov 254�� ENVIRONNIL`4 � _�_ riEALTH Linda Turkatte PERMIT/SERVICES San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 -M lw Working To Restore Nature November 20, 1992 RE Corrigan Property, 620 San Juan Drive, Stockton, California, Site Code 2001 Dear Ms Turkatte This correspondence details Fourth Quarter 1992 field activities performed at the above referenced site (Figure 1) by RESNA Industries, Inc (RESNA) Groundwater monitoring and sampling was conducted on October 12, 1992 by RESNA personnel Water level measurements were collected from each monitoring well using a Solinist Water Level Meter (Model 101) Groundwater monitoring of wells MW1, MW2, and MW3 indicate a drop of the groundwater table since last monitoring in July, 1992, averaging 0 75 feet Table 1 summarizes groundwater elevation data A groundwater gradient map was created using the October 12, 1992 data Groundwater flows to the south at a gradient of 0 0048 or approximately 25 3 feet/mile (Figure 2) Prior to sampling, at least three well volumes of water were purged from each well Groundwater samples were collected from the three wells after stabilization of pH, electrical conductivity (EC) and temperature The samples were collected using dedicated, disposable bailers The samples were sent to State -certified RESNA Environmental Laboratories in Fremont, California Collected water samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 8020 and total petroleum hydrocarbons as gasoline (TPHG) and diesel (TPHD) using EPA method 8015 All purged water was contained in DOT approved drums and left on site pending laboratory analyses Water containing nondetectable concentrations of BTEX and TPHG will be disposed of at the site by dumping the water within planters located on-site QR111392 FNL