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_ a AWAAFAIR P1_ _r� Working To Restore Nature i 3 DEC 5 PH 2' 18 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 May 11, 1993 Ms Cathy Copeland Chevron U S A Inc 3300 Monte Cnsto Road Bakersfield, California 93308 RE Chevron U S A Production/Carnation Plant 540 North Aurora Way, Stockton, CA Dear Ms Copeland At the request of Chevron U S A Inc (Chevron), RESNA Industries Inc (RESNA) has conducted groundwater monitoring and sampling at the above referenced site (Figure 1) This letter summarizes monitoring activities conducted by RESNA on April 1, 1993 Water level measurements were collected from each monitoring well using a Solinst Water Level Meter (Model 101) Groundwater monitoring of wells MW1, MW2, and MW3 showed a rise in the groundwater elevation since last monitoring on June 16, 1992, averaging 0 04 feet Table 1 summarizes groundwater elevation data A groundwater gradient map was created using the April 1, 1993 data The groundwater gradient is approximately 0 025 feet/foot or 132 feet/mile in a northeast direction (Figure 2 ) This groundwater gradient is consistent with previous monitoring rounds At Chevron's request, groundwater samples were collected from wells MWI, MW2 and MW3 Prior to sampling, 3 to 5 well volumes of water were purged from each well All purged water was pumped into an onsite baker tank for future disposal Groundwater samples were collected from the wells after stabilization of pH, electrical conductivity (EC) and temperature Field purge logs are included in Attachment 1 The samples were collected using la dedicated, disposable bailer The samples were sent to state-certified RESNA Environmental iLaboratories in Fremont, California All samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 80241602, total petroleum hydrocarbons as gasoline (TPHg) and LETrERS1011040193 W