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O <br /> *VA <br /> Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 ili� f.} ,i _�+T )_ ; �� September 25, 1992 <br /> Phone (209) 838-3507 LT.; 1 T/--j V`11 C r,5 <br /> FAX (209)838-3509 <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' Third Quarter 1992 groundwater monitoring and sampling <br /> activities performed at the above referenced site (Figure 1) <br /> Groundwater monitoring and sampling was conducted on August 5 and 6, 1992 by RESNA <br /> personnel A parked car obstructed sample collection from MW-5 on August 5, therefore MW-5 <br /> was monitored and sampled on August 6, 1992 Water level measurements were collected from <br /> each monitoring well using a Solinst Water Level Meter (Model 101) Groundwater monitoring <br /> showed a drop in the groundwater table elevation since May 1991, averaging 0 45 feet <br /> (Attachment 1) Table 1 summarizes groundwater elevation information A groundwater <br /> gradient map was created using the August 1992 data Groundwater flows generally easterly <br /> with a maximum gradient of 019 ft/ft (Figure 2) <br /> Prior to sampling, a minimum of 3 casing volumes of water were purged from each well <br /> Groundwater samples were collected from each well 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, total <br /> xylenes (BTEX) using EPA Method 8020/602 and total petroleum hydrocarbons as gasoline <br /> (TPHG) using modified EPA Method 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 /> QR092592 FNL <br />