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-- -_— ®— �E� <br /> E Working to Restore Nature <br /> 1710 Main Street APR j ;,92 <br /> Escalon,CA 95320 <br /> Phone (209) 838-3507 F,1,1Vjr'Oj,1[i1ENTAL HEALTH <br /> FAX (209)838-3509 PERMIT/SERVICES <br /> April 2, 1992 <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 First Quarter 1992 activities performed at the above <br /> referenced site (Figure 1) <br /> Groundwater monitoring and sampling was conducted on February 13, 1992 by RESNA <br /> personnel Water level measurements were collected from each monitoring well using a Sohnst <br /> Water Level Meter (Model 101) Groundwater monitoring of wells MWI, MW2, MW3, MW4, <br /> and MW5 showed an increase in the groundwater table elevation since last monitoring in August <br /> 1991, averaging 0 52 feet (Attachment 1) Table 1 summarizes groundwater elevation <br /> information A groundwater gradient map was created using the February 13, 1992 data The <br /> groundwater gradient is approximately 0 011 feet/feet or 58 feet/mile in a northeast direction <br /> (Figure 2) <br /> Prior to sampling, 3 to 5 well volumes of water were purged from each well Groundwater <br /> samples were collected from five wells after stabilization of pH, electrical conductivity (EC) and <br /> 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, total xylenes (BTEX) using EPA <br /> Method 8020/602 and total petroleum hydrocarbons as gasoline (TPHg) using modified EPA <br /> Method 8015 <br /> QR032692 MAD <br />