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NVAPM <br /> r� <br /> r <br /> Working to Restore Mature <br /> 1710 Main Street � ��-7� r�f ',„�� I�= <br /> Escalon, CA 95320 AUG 2 61992 August 25, 1992 <br /> Phone (209)838-3507 <br /> FAX (209)838-3509 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Steven Schneider <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> RE C M Weber Enterprises, Inc property, 141 North El Dorado Street, Stockton, <br /> California <br /> Dear Mr Schneider <br /> This letter details RESNA Industries Second Quarter 1992 activities performed at the above <br /> referenced site (Figure 1) <br /> Groundwater monitoring and sampling was conducted on May 5, 1992 by RESNA personnel <br /> A parked car obstructed sample collection from MW-5, therefore MW-5 was sampled on May <br /> 6, 1992 Water level measurements were collected from each monitoring well using a Solinst <br /> Water Level Meter (Model 101) Groundwater monitoring showed an increase in the <br /> groundwater table elevation since February 1991, averaging 0 18 feet (Attachment 1) Table <br /> 1 summarizes groundwater elevation information A groundwater gradient map was created <br /> using the May 5, 1992 data The groundwater gradient is approximately 0 018 feet/feet or 95 <br /> feet/mile in a northeast direction (Figure 2) <br /> Prior to sampling, 3 to 5 casing volumes of water were purged from each well Groundwater <br /> samples were collected from each well after stabilization of pH, electrical conductivity (EC) and <br /> temperature The samples were collected using dedicated, disposable bailers The samples were <br /> sent to state-certified RESNA Environmental Laboratories in Fremont, California All samples <br /> were analyzed for benzene, toluene, ethylbenzene, total xylenes (BTEX) using EPA Method <br /> 8020/602 and total petroleum hydrocarbons as gasoline (TPHg) using modified EPA Method <br /> 8015 <br /> All purged water was containerized in DOT approved drums and left on site pending laboratory <br /> analyses Water containing nondetectable concentrations of BTEX and TPHG will be disposed <br /> of at the site by dumping the water within the planters <br /> QR071692 FNL <br />