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v, <br />1710 Main Street <br />Escalon, CA 95320 <br />Phone (209) 838-3507 <br />FAX (209) 838-3509 <br />+�S 5 <br />AU G 1 2 1992 <br />ENVIRONMENTAL. HEALTH <br />PERMIT/SERVICES <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 />Working to Restore Nature <br />August 10, 1992 <br />This correspondence details RESNA industries Second Quarter 1992 field activities performed <br />at the above referenced site (Figure 1) <br />Groundwater monitoring and sampling was conducted on April 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 rise <br />of the groundwater table since last monitoring in January, 1992, averaging 0 89 feet (Attachment <br />1) Table 1 summarizes groundwater elevation information A groundwater gradient map was <br />created using the April 9, 1992 data The groundwater gradient is approximately 0 007 feet/foot <br />or 37 feet/mile in a southern direction (Figure 2) <br />Prior to sampling, 3 to 5 well volumes of water were purged from each well Groundwater <br />samples were collected from the three wells after stabilization of pH, electrical conductivity (EC) <br />and temperature The samples were collected using a dedicated, disposable bailer The samples <br />were sent to state -certified RESNA Environmental Laboratories in Fremont, California All <br />samples were analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX) using EPA <br />Method 8020/602, total petroleum hydrocarbons as gasoline (TPHG) and diesel (TPHD) using <br />modified EPA Method 8015, and total lead <br />OR073092 MRM <br />