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ATC Associates Inc. y 1117 Lone Palm Avenue, Suite B Modesto,California 95351 209-579-2221 k ;c: A S S o c i A T'E s i N c . Fax: 209-579-2225 groundwater samples indicated the lateral extent of impacted soil and groundwater had been defined. Refer to ATC's Summary Report Additional Subsurface Investigation, 7675 West Eleventh Street, Tracy, California, dated May 12, 1999, for additional information. Based on historical data and a verbal discussion with Mr. Ron Rowe of EHD, ATC submitted a closure report request dated June 27, 2000. EHD did not formally respond to the report but instead requested that ATC perform another monitoring event. In a letter dated October 2, 2001, Ms. Dot Lofstrom of the EHD requested computer modeling of the groundwater plume be conducted. ATC evaluated contaminant migration potential of affected soil and groundwater at the site using the EPA's BIOSCREEN (v.1.4) software program. The results of the computer modeling indicated the petroleum impacted soil and groundwater at the site do not appear to be an immediate and significant threat to human health or the environment. The computer modeling results are presented in ATC's Addendum to Additional Site Evaluation and Request for No Further Action for Fayette Manufacturing Corporation, dated November 4, 2002. ATC prepared the Workplan for Additional Subsurface Investigation at Fayette Manufacturing Corporation Site, 7675 West Eleventh Street, Tracy, California dated March 4, 2004, in response to the EHD directive dated February 17, 2004. The letter included a summary of the EHD review of the First Quarter 2004 Groundwater Monitoring Report dated January 27, 2004, prepared by ATC. In response to the EHD letter, ATC prepared the February 17, 2004, Work Plan to perform additional subsurface investigation. The Work Plan included completion of one Cone Penetrometer Test (CPT) boring to investigate the vertical extent of groundwater contamination and three Geoprobe® soil borings between wells MW4 and MW5 to evaluate the possible lateral migration of impacted groundwater between the monitoring wells. The Work Plan was approved by EHD on March 11,2004. Investigation activities associated with the March 4, 2004, Workplan for Additional Subsurface Investigation at Fayette Manufacturing Corporation Site, 7675 West Eleventh Street, Tracy, California were initiated on April 5, 2004 by ATC. Fisch Environmental (State C57 license no. 683865) completed soil borings GPI, GP2, and GP3 utilizing a Geoprobe® direct push rig. Each boring was advanced to approximately 16 feet bgs to a sand interval below the first encountered groundwater. Soil samples were collected at five-foot intervals or significant changes in lithology using a 1-inch diameter acetate sleeve. A photo ionization detection meter (PID) was used as a field-screening device for the detection of petroleum hydrocarbon vapors. On April 5, 2004, groundwater samples were collected from borings GPI, GP2, and GP3 at approximate depths of 16 feet bgs. The samples were collected by inserting Teflon tubing into the boring and oscillating the tubing up and down. Sample containers were then labeled with sample identification, placed on ice, and shipped under chain-of-custody to Argon Laboratories. Page 3 (M- %TC w:\17861\WP for Additional Subsurface Investigation Soil Vapor Study,and Modeling ....°'""' ...