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a .04N — Asa i 1 i q <br /> . <br /> k" <br /> F <br /> U-1:, g�vsL <br /> WATERWORK CGRP_ <br /> J..T <br /> A R[SNA Company r <br /> Environmental Solutions <br /> Through Applied Science, <br /> Engineering&Construction <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> Fax: (209) 838-3509 DEC 9 ^^t <br /> ENVIRUi December 5, 1991 <br /> PER. Mi l <br /> Mr, Steve Schneider <br /> San Joaquin County Public Health Services ' <br /> Environmental Health Division e <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> i <br /> RE: C. M. Weber Enterprises, Inc, property, 141 North El Dorado Street, Stockton, <br /> California. <br /> E � <br /> Dear Mr Schneider; [ <br /> --� This Ietter updates RESNA Industties 7:bird Qdarter 1991 activities for the above referenced site <br /> (Figure 1). Groundwater monitoring and sampling was conducted an August 25), -1991. by <br /> RESNA personnel. Water level measurements were collected from each monitoring well using r f <br /> a Solinst Water Level Meter O.yodel 101), Groundwater monitoring of wells MW1, MW2, <br /> MW3, MM14, and MliV5 showed a increase in the groundwater table elevation since list <br /> } monitoring in April 1991, averaging 0.32 feet. Table i. summarizes groundwater elevation <br /> information.. A groundwater gradient map was created using the August 29, 199I data.' The <br /> groundwater gradient averages approximately 0.006 feet/feet or 32 feet/mile, flow across the site <br /> is in a northeast 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 f,a;yells after stabilization of pH,electrical conductivity <br /> d temperature. Pure los are included in Attachment . samples iThe les were collecr (EQ and <br /> g g P ,-d using a <br /> dedicated, dispo=ble bailer. The samples were. sent to state-certified Applied Analytical ` <br /> Environmental Laboratories in Fremont, California. All samples were analyzed for benzene, r <br /> + ! toluene, ethylbenzene, total xylenes (BTEX) using E;'A Method 8020/602 and total petroleum <br /> hydrocarbons as gasoline (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 13TEX and TPHG will be diseased_T <br /> of-at-the-site by irrigating-the ornamental during the fourtbquarter sampling. T <br /> I <br /> s;. <br /> QR1120?I.TLP <br /> i <br />