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, T r' B R 0 W N A N D C A L D W E L L SEP 141994 ENVRONMENTAL HEALTH September 7, 1994 PERMIT/SERVICES Mr Chuck Carmel ARCO Products Company Post Office Box 5811 San Mateo, California 94402 017-1318-01/1 Subject Second 1994 Quarterly Report for ARCO Station 434 501 Kettleman Lane, Lodi, California Site Code 1341 Dear Mr Carmel This report presents groundwater monitoring results and summarizes the progress of the soil vapor and groundwater extraction and treatment operations for the second quarter of 1994 at ARCO Products Company (ARCO) Station 434, located at 501 Kettleman Lane in Lodi, California Monitoring was performed on June 23, 1994, by Groundwater Technology, Inc (GTI) The remediation system data were collected by Brown and Caldwell personnel This report was prepared under Task Order 434-94-5 iThere are six on-site monitonng wells (W-1A, W-2, W-2A, W-213, W-3, and W-9) and eight off-site monitoring wells (W-4, W-5, W-6, W-7, W-8, W-10, W-11, and W-12) (Figure 1) All monitoring wells were measured and sampled except W-2 (due to an obstruction), W-2A and W-4 (due to lack of water), and W-7 (the traffic control lid could not be removed) Because of the obstruction, well W-2 will be replaced in the near future As requested by the County of San Joaquin (County), a work plan for the well replacement was submitted to the County on March 23, 1994 Field and Analytical Methods GTI personnel measured depth-to-water, purged each well, and collected groundwater samples at the site Static water levels were measured prior to purging Prior to sampling, the wells were purged of a minimum of three well volumes, or until evacuated, using a submersible pump or disposable bailer After purging, each well was sampled using a disposable bailer Field data sheets are included in Exhibit A All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-G) and benzene, toluene, ethylbenzene, and xylenes (BTEX) by U S Environmental Protection Agency (EPA) Methods 5030/8020/DHS LUFT This report was prepared in accordance with the standards of the environmental consulting industry at the time it was prepared It should not be relied upon by parties other than those for whom it was prepared, and then only to the extent of the scope of work which was authorized This report does not guarantee that no additional environmental coniam motion beyond that described in this report exists at the site Environmental Engineering And Consuitrrg Anaiyt+cai Services 9616 MICROti A%ErUE P o Box 13449 $ ,CR„IE`TO CA 9)813 314T EP0RTS\2ND9L4QTRRE-r (916) 444 0123 F,x (9161 9)6 3271