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�"� .ate.�7•� �� �y .w"�.+,. ,-so �'. �LZsA; 3ez <br /> Azff&FA <br /> Working to Restore filature <br /> 1710 Main Streeta <br /> Escaion,CA 95320 APR 1 Q x.,92 <br /> Phone:(209)638-3507 L;,,iV1130NMEENTAL HEALI'M <br /> FAX:(209)838-3509 PERNA[T/SERV!CES April 2, 1992 <br /> i - <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 /> 1 <br /> � 1 <br /> Groundwater monitoring and sampling was conducted on February 13, 1992 by RESNA E <br /> i personnel. Water level measurements were collected from each monitoring well using a Solinst <br /> Water Level Meter(Model 101). Groundwater monitoring of wells MWl, MW2,MW3,MW4, <br /> and MW5 showed an increase in the groundwater table elevation since last monitoring in August j <br /> 1991, averaging 0.52 foa (Attachment 1). Table 1 summarizes groundwater elevation <br /> information. A groundwater gradient map was created using the February 13, 1992 data. The <br /> _t <br /> groundwater gradient is approximately 0.011 feet/feet or 58 feeftile in a"noriheast direr#on <br /> (Figure 2). <br /> Prior to sampling, 3 to 5 well volumes of water were p.trged from each well. Groundwater F <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 /> Ji <br /> T - — - - <br /> QR43202MAD <br /> s <br /> 7. <br /> i. <br /> a <br />