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Brown and Caldwell <br /> Consultants <br /> �� k � <br /> 723 S Street <br /> Sacramento C V 7J APR R z C 1993 <br /> arnia <br /> 1 (91x6)44408947092 ENVIRONMENTAL HEWN <br /> [996)444 0123 <br /> FAX(916)444 8437 PERMIT/SERVICES <br /> April 22, 1993 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-7484-0311 <br /> Subject. First 1993 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 soil <br /> vapor and groundwater extraction and treatment operations for the first quarter of 1993 at <br /> ARCO Products Company (ARCO) Station 434, located at 501 Kettleman Lane in Lodi, <br /> 0California Monitoring was performed on February 22 and 23, 1993 by Emcon Associates <br /> ` (Emcon) The remediation system data were collected by Brown and Caldwell personnel. <br /> This report was prepared under Task Order 434-93-5. <br /> There are six on-site monitoring wells (W-1A, W-2, W-2A, W-2B, W-3, and W-9) and eight <br /> off-site 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 (due to an obstruction), W-2A <br /> and W-4 (due to lack of water), and MW-10 (due to inaccessibility) W-2 appears to be bio- <br /> fouled, and 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 /> polyvinyl chloride bailer After purging, each well was sampled using a teflon bailer. Field <br /> data sheets and chain-of-custody forms are included in Exhibit A. <br /> During routine operation and maintenance site visas, Brown and Caldwell personnel collected <br /> influent samples of the groundwater remediation system and recorded the total groundwater <br /> flow through the system <br /> 40 All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline(TPH-G) <br /> and benzene, ethyibenzene, toluene, and xylenes (BETX) by U S. Environmental Protection <br /> Agency (EPA) Methods 5030/80201DHS LUFT <br /> 74844ZEP0RTS\FFM93Q'I' MT <br />