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(YVATC <br /> • 1117 Lone Palm Avenue, Suite <br /> Modesto, CA 953511 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A 8 8 0 C I A T E 8 I N C . <br /> April 9, 2004 <br /> 54. 25291.0001 <br /> MDC�C����J�D <br /> Mr. Jeff Wong APR 12 2004 <br /> San Joaquin County <br /> Environmental Health Department ENVIRONMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Subject: Addendum to Interim Remediation Plan for Former Greer Construction, 15634 <br /> Steinegul Road, Escalon, California <br /> Dear Mr. Wong: <br /> ATC Associates Inc. has completed this Addendum to our Interim Remediation Plan dated <br /> March 25, 2004, for the above referenced site (Figure 1). This addendum was prepared at the <br /> verbal request of Mr. Jeff Wong to address well construction details omitted from the Interim <br /> Remediation Plan. ATC proposes to install the new vapor extraction well to a depth of <br /> approximately 60 feet below ground surface (bgs). Drilling will be conducted by a State- <br /> licensed (C57) drilling company. A field geologist will be present to log drill cuttings and soil <br /> samples from the borings. Descriptions of soil types encountered and sample collection <br /> intervals will be recorded on boring/well logs. Soil samples will be collected at ten-foot <br /> intervals. Each soil sample will be field screened with a photo ionization detector (PID) or <br /> similar instrument and at least two samples from the boring, based on field observations (i.e. <br /> odor, discoloration, PID readings), will be placed in a cooler with ice and submitted for <br /> laboratory analyses. The well location is shown on Figure 2. <br /> The vapor well will be constructed with 2-inch PVC casing to approximately 60 feet bgs. The <br /> screened interval will be positioned from approximately 50 feet above to 60 feet bgs. The screen <br /> slot size will be 0.020-inch. Well construction details are depicted on Figure 3. To protect the <br /> integrity of the well, a locking, watertight well plug will be installed on the well and a watertight <br /> wellhead labeled "monitoring well" will be concreted over the well. All drill cuttings will be stored <br /> on site in 55-gallon drums pending laboratory results. <br /> Selected soil samples will be immediately placed in a cooler with ice and delivered under <br /> chain-of-custody documentation to a State-certified analytical laboratory. The soil samples will <br /> be analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA method 801513, and <br /> benzene, toluene, ethyl benzene, xylenes (BTEX), methyl tertiary butyl ether (MTBE), tertiary <br /> butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary <br /> amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and 1,2 dibromoethane (EDB) by <br /> EPA method 8260B. <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />