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HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment,Remedial Testing,Design and Operation 4 July 27, 2005 RECEQWE Mr. Rob Fishburn �JJ Ultramar Inc. JUL w 8 2005 685 West Third Street ENVIRONMENT HEALTH Hanford, California 93230 PERNIIT/SERVICES Subject: Quarterly Groundwater Monitoring 1 Remediation System Report Second Quarter 2005 Beacon Station No. 3641 1210 East Hammer Lane, Stockton, California Mr. Fishbum.- Horizon Environmental Inc. (Horizon) has prepared this report which documents results of second quarter 2005 groundwater monitoring at the subject site located in San Joaquin County as shown on Figure 1. There are twelve groundwater monitoring wells (MW-1 through MW-7 and MW-9 through MW-13), eight vapor wells.(VW-1 through VW-8) and one sparge well (SW-1) associated with the site (Figure 2). The off-site monitoring well MW-8 was destroyed in April 2003. Monitoring wells MW-9 through MW-13 were installed during fourth quarter 2004 and are included in the quarterly monitoring program starting second quarter 2005. The wells are sampled according to the program contained in Attachment A. Horizon conducts operation and maintenance activities at the site for vapor extraction / air sparge systems. Operation of the remediation systems was initiated in March 2005 under a San Joaquin Valley Air Pollution Control Board Authority to Construct Permit No. N-5036- 1-1. Groundwater Monitoring Groundwater monitoring activities were conducted by Doulos Environmental Company (Doulos) on June 16, 2005 according to Ultramar Field Procedures (Attachment A). Monitoring activities included measurement of static groundwater level, purging groundwater from the wells, collection of groundwater samples, and preparation and delivery of the samples to the analytical laboratory. The depth to groundwater was measured to the nearest 0.01 foot from the top-of-casing (TOC) in monitoring wells MW-1 through MW-7, MW-9 through MW-13, sparge well SW-1 and vapor wells VW-1, VW-3, VW-6 and VW-7. Vapor wells VW-2, VW-4, VW-5 and VW- 8 were dry. The physical parameters conductivity, pH and temperature of the groundwater were monitored with field instrumentation during the purging process. The visual characteristics of the groundwater were also noted during the purging process. Field I 4970 Windplay Drive,#C5 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 P.O.Box 5283 • Bakersfield,CA 93388 • (661)589-8389 • FAX(661)589-1456 r