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4 <br />1710 Main Street <br />Escalon, CA 95320 <br />Phone (209) 838-3507 <br />FAX (209) 838-3509 <br />OCT 9 6 9992 <br />ENVIRONMENTAL HEALTH <br />PERM 11 /$E:RV1W3 <br />Linda Turkatte <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />P O Box 2009 <br />Stockton, California 95201 <br />RE Corrigan Property, 620 San Juan Drive, Stockton <br />Site Code 2001 <br />Dear Ms Turkatte: <br />NAWSAMA <br />Working to Restore Nature <br />October 15, 1992 <br />This correspondence details Third Quarter 1992 field activities performed at the above <br />referenced site by RESNA Industries, Inc (RESNA) (Figure 1) <br />Groundwater monitoring and sampling was conducted on July 9, 1992 by RESNA personnel <br />Water level measurements were collected from each monitoring well using a Solinst Water Level <br />Meter (Model 101) Groundwater monitoring of wells MW1, MW2, and MW3 indicate a drop <br />of the groundwater table since last monitoring in April, 1992, averaging 1 3 feet Table 1 <br />summarizes groundwater elevation data A groundwater gradient map was created using the July <br />9, 1992 data Groundwater flows to the south at a gradient of 0 0057 or approximately 30 <br />feet/mile (Figure 2) <br />Prior to sampling, at least three well volumes of water were purged from each well <br />Groundwater samples were collected from the three wells after stabilization of pH, electrical <br />conductivity (EC) and temperature The samples were collected using dedicated, disposable <br />bailers The samples were sent to state -certified RESNA Environmental Laboratories in <br />Fremont, California All samples were analyzed for benzene, toluene, ethylbenzene and xylenes <br />(BTEX) using EPA Method 8020 and total petroleum hydrocarbons as gasoline (TPHG) and <br />diesel (TPHD) using modified EPA Method 8015 Total lead was not analyzed during this <br />round of sampling due to nondetectable results from last quarter <br />QR101292 MRM <br />