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Brown and Caldwell <br /> Consultants <br /> 7a3 <br /> Sacramento <br /> � Calrfom a95814-7092 � !��' <br /> (916)444 0123 <br /> FAX(916)444 8437 DEC <br /> E C 2 9 1An2 <br /> December 16. 1992 ENV! {L! _NTAL HJ EALTH <br /> PERS,:( i SERVICES <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-6731-03/1 <br /> Subject Third 1992 Quarterly Report for ARCO Station 434, <br /> 501 Kettlernan Lane, Lodi, California: Site Code 1341 <br /> Dear Mr Carmel. <br /> This report presents water level measurements and results of groundwater sampling performed <br /> during the third quarter of 1992 at ARCO Products Company (ARCO) Station 434, located <br /> at 501 Kettleman Lane in Lodi, California. The work was performed on August 18, 1992,by <br /> Emcon Associates (Emcon) under Task Order 434-92-5A. There are six on-site monitoring <br /> wells (W-1A, W-2, W-2A, W-2B, W-3, and W-9) and eight off-site monitoring wells (W-4, <br /> W-5, W-6, W-7, W-8, W-10, W-11, and W-12) (Figure 1) All monitoring wells were <br /> measured and sampled except W-2, W-2A, and W-4, due to an obstruction in W-2 and lack <br /> of water in, W-2A and W-4 W-2 appears to be bio-fouled, and attempts to mechanmally <br /> unplug it have not been successful. <br /> Field and Analytical Methods <br /> Emcon personnel measured depth-to-water, supervised purging of each well, and collected <br /> groundwater samples at the site. Static water levels were measured pnor to purging. Prior <br /> to sampling, the wells were purged of a minimum of thrice well volumes, or until evacuated, <br /> using a submersible pump or bailer. After purging, each well was sampled using a teflon <br /> bailer Field data sheets and chain-of-custody forms are included m Exhibit A <br /> All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline(TPH-G) <br /> and benzene, ethylbenzene, toluene, and xylenes (BETX) by U S. Environmental Protection <br /> Agency (EPA) Methods 5030/8020/DHS LUFT <br /> Results <br /> The general groundwater flow across the site is to the south-southwest with an average <br /> . hydraulic gradient of 0 002 Water level data are listed in Table 1 Table 2 shows past and <br /> present hydrauhc gradients and groundwater flow directions. Figure 1 illustrates groundwater <br /> contours and the groundwater flow direction Well W-2B was not used for contouring, as this <br /> well is completed in a deeper zone than the other wells <br />