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LBrown and Caldwell <br /> 'Qonsultants <br /> 1 723 5 Street fr <br /> Sacramento <br /> CaVomla 95814-7092 <br /> (916)444 0123 MAP I W! <br /> FAX(916)444 8437 N ! ;V 4 1 y <br /> r <br /> March 26, 1993 ���?i�!'4 ''y { V <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 017-6731-03/1 <br /> San Mateo, California 94402 <br /> Subject Fourth 1992 Quarterly Report for ARCO Station 434, <br /> 501 Kettleman Lane, Lodi, California: Site Code 1341 <br /> Dear Mr. Carmel <br /> This report presents groundwater monitoring results and summarizes the progress of the sod <br /> vapor and groundwater extraction and treatment operations for the fourth quarter of 1992 at <br /> ARCO Products Company (ARCO) Station 434, located at 501 Kettleman Lane in Lodi, <br /> California. Monitoring was performed on November 16 and 17, 1992, by Emcon Associates <br /> 0 (Emcon) The remediation system data were collected by Brown and Caldwell personnel. <br /> This report was prepared under Task Order 434-92-5A. <br /> There are six on-site monitoring wells (W-lA, W-2, W-2A, W-2B, W-3, and W-9) and eight <br /> off-srte monitoring wells (W-4, W-5, W-6, W-7, W-8, W-10, W-11, and W-12) (Figure 1). <br /> All monitoring wells were measured and sampled except W-2, W-2A, and W-4, due to an <br /> obstruction in W-2 and lack of water in W-2A and W-4. W-2 appears to be bio-fouled, and <br /> attempts to mechanically unplug it have not been successful. <br /> Field and Analytical Methods <br /> Emcon personnel measured depth-to-water, purged each well, and collected groundwater <br /> samples at the site Static water levels were measured prior to purging. Prior to sampling, <br /> the wells were purged of a minimum of three well volumes, or until evacuated, using a <br /> submersible pump or bailer. After purging, each well was sampled using a teflon bailer <br /> Field data sheets and chain-of-custody forms arc included in Exhibit A. <br /> During routine operation and maintenance site visits,Brown and Caldwell personnel collected <br /> influent samples of the groundwater remediation system and recorded the total groundwater <br /> now through the system <br /> All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline MH-G) <br /> . and benzene, ethylbenzene, toluene, and xylenes (BEM by U S Environmental Protection <br /> Agency (EPA) Methods 5030/8020/DHS LUFT. <br /> 673 TSrN0V92grRxVr <br />