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pekr.eil <br /> WINE <br /> 4 Room I9 fib. <br /> P <br /> a <br /> ' MNA WATERWORK CORP. <br /> INDUST RIES <br /> January 24" 1991 <br /> Ms. Margaret Lagorio <br /> ;an Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton. CA 95201 <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 beneati, the site is toward <br /> the southwest" with a magnitude of approximately 0.001 ft/ft or <br /> 5.26 ft/mile (Figure 3). Monitoring wells MW2 and MW3 are not <br /> included in the groundwater gradient calculation due to their <br /> i <br /> tpartial 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 ssndpaek). Approximately <br /> 0.02 inches of free product was measured in MW1 (Table 3 ) . <br /> Groundwater monitoring wells MW2, MW3, and MW4 were hand baled <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 /> sam?iles. 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 EPA <br /> protocol. The samples were analyzed for benzene, toluene, ethyl- <br /> benzene, xylenes (BTEX), total petroleum hydrocarbons as gasoline <br /> and diesel (TPHG & D), and halogenated volatile organics by EPA <br /> methods 8020/6015 and 601; respectively. <br /> Laboratory results indicate non-detectable levels for all con- <br /> stituents of petroleum hydrocarbons (BTE7t/TPHG & D) in wells MW2, <br /> MW3, MW4 and MW6 (Table 2). Monitoring well MW5 analytical <br /> results show 2.0 parts per billion (ppb) benzene, 1.0 ppb ethyl- <br /> benz?ne, 2.0 ppb xylenes, 50 ppb total petroleum hydrocarbons as <br /> gasoline. Halogenated volatile organics were also noted in MWS <br /> 6 J <br /> 1710 MAIN STN EST • ESCALON,CA 95320 • (209)S38-3507 <br /> 2350•A WALSH AVENUE 9 SANTA CLARA,CA 95051 • (408)496-1249 <br />