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�f� �' i _ Sti -. � t-^ N a e ' .w s:,. ws. W.• _. _ -" 'y <br /> ,�? 't "ue' .�, � 3 :#- w ,s�•x" Amy- �„ � <br /> s � wi4 <br /> ' RESNA WATERWORK CORP. <br /> w INDUSTRIES. <br /> January 24, 1991 <br /> Ms. Margaret Lagorio �.• <br /> Sari Joaquin County Public Health Services <br /> Environmental Health Division `- <br /> P.O. Box 2009 <br /> Stockton, CA 95201 "`_ t <br /> r r <br /> 41 frs, <br /> Re: Quarterly Report, Holt Brothers, 1541 West Charter Way, <br /> Stockton, CA <br /> Dear Margaret: <br /> This letter report summarizes the activities for the fourth <br /> quarter of 1990, at the above referenced site (Figure 1 & 2). <br /> Groundwater monitoring data collected on December 17, 1990, <br /> (Table 1), indicates groundwater flow beneath the site is toward <br /> the southwest with a magnitude of approximately 0.001 ft/ft or <br /> 5.28 ft/mile (Figure 3). Monitoring wells MW2 and MW3 are not <br /> included in the groundwater gradient calculation due to their <br /> partial penetration through the zone of saturation (Table 2) . } <br /> This gradient is consistent with observations presented in Dames <br /> and Moore earlier reports. <br /> Monitoring wells MW5 and MW6 were purged by extracting approxi- <br /> mately four well volumes (casing and sandpack). Approximately f <br /> 0.02 inches of free product was measured in MWl (Table 3 ) . <br /> Groundwater monitoring wells MW2, MW3, and MW4 were hand bailed <br /> dry and allowed to recover several times to extract stagnant <br /> water from the wells. Indicator parameters (temperature? EC and <br /> PH) were allowed to stabilize before obtaining the groundwater <br /> samples. Groundwater samples were collected using a teflon <br /> bailer with a bottom emptying device. Samples were contained, <br /> preserved, and transported under chain-of-custody -to Applied <br /> Analytical (DHS Certification #1211 ) in accordance with SPA <br /> protocol. The samples were analyzed for benzene, toluene, ethyl- x <br /> benzene, xylenes (BTEX), total petroleum hydrocarbons as gasoline <br /> and diesel (TPHG & D), and halogenated volatile organics by EPA A <br /> methods 8020/8015 and 601, respectively. <br /> Laboratory results indicate non-detectable levels for all con- <br /> stituents of petroleum hydrocarbons (STEX/TPHG & D) in wells MW2, <br /> MW3, NIW4 and MW6 (Table 2) . Monitoring well MW5 analytical <br /> results show 2.0 parts per billion (ppb) benzene, 1.0 ppb ethyl- <br /> benzene, 2.0 ppb xylenes, 50 ppb total petroleum hydrocarbons as <br /> gasoline. Halogenated volatile organics were also noted in MW5 <br /> 1710 MAIN STREET • ESCALON,CA 95320 • (209)838-3507 <br /> (408)496-1249 <br /> 2350-A WALSH AVENUE • SANTA CLARA,CA 95051 . <br /> 4 <br />