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r B R 0 W N AND C A L D W E L L PX1: 39 April 4, 1995 Mr. Kyle Christie ARCO Products Company 2155 South Bascom Avenue, Suite 202 Campbell, California 95008 017-1318-0111 Subject: Fourth 1994 Quarterly Report for ARCO Facility 434 501 Kettieman Lane, Lodi, California: Site Code 1341 Dear Mr. Christie: This report presents water-level measurements, results of groundwater sampling performed and summarizes the progress of the soil vapor and groundwater extraction and treatment operations for the fourth quarter of 1994 at ARCO Products Company (ARCO) Facility 434, located at 501 Kettleman Lane in Lodi, California. Fieldwork was performed by Groundwater Technology, Inc. (GTI) on December 19, 1994. The remediation system data were collected by Brown and Caldwell personnel. This report was prepared under Task Order 434-94-5. There are six on-site monitoring 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) as shown on Figure 1. In addition, there are eight soil vapor extraction wells (VE-1 through VE-8) on site. Field and Analytical Methods GTI personnel measured depth-to-water and product thickness (when present), purged each well to be sampled, and collected groundwater samples at the site. All groundwater monitoring wells were sampled except W-2, W-4, and W-10. Well W-2's casing was obstructed, well W-4 was dry,and well W-10 was inaccessible. Depth-to-water measurements and a check for free product were made prior to purging. Before sampling, the wells were purged of a minimum of three well casing volumes, or until evacuated, using a submersible pump or polyvinyl chloride (PVC) bailer. After purging, each well was sampled using a disposable bailer. All groundwater samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPH-G) by U.S. Environmental Protection Agency (EPA) Methods 503018020, and 8015 Modified. Field data sheets and chain-of-custody documentation are included in Exhibit A. 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 •1 extent of the scope of work which was authorized- This report does not guarantee that no additional environmental contamination beyond that described in this report exists at the site. Environmental Engineering And Consulting-Analytical Services 9616 M 1 C R 0 AFFNUE, 5U.ITE 600, SACRA'iENT0, CA 95827-262713194ZFP01zTSS4TH94gMJtPT (916) 444.0123 FAX (916) 856-5277 t