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" ATC <br /> Associates Inc. <br /> 11 17 Lone Palm Avenue, Suite B <br /> ( %Tc Modesto,California 95351 <br /> 209-579-2221 <br /> A S .S O C 1 A T E S INC- <br /> Data <br /> N C <br /> Fax:209-579-2225 <br /> Data Comparison <br /> Pursuant to a request made by the EHD, further environmental risk assessment will be performed . <br /> for target analytes that have been detected in vapor, soil, and groundwater samples associated <br /> with the site using the following regulatory standards: Version 9, October.2004 EPA Region IX <br /> PRG's, San Francisco Bay RWQCB (Region II) ESL's for Shallow Soils (<3 meters bgs), <br /> Johnson Ettinger Soil Gas Modeling, and CHHSL's. <br /> Report Preparation <br /> i <br /> Upon completion of the subsurface investigation activities, a summary report will be prepared <br /> for submittal to the EHD. The report will include a description of all field activities, laboratory <br /> analytical results, and boring logs. A recommendation for closure or remedial action, where <br /> applicable,will be presented. <br /> Monitoring Well Network Monitoring Program <br /> i <br /> Groundwater monitoring and sampling will be reinitiated at the site under the following <br /> schedule. <br /> Well ID Quarter 4-2006 Quarter 1 -2007 Quarter 2-2007 Quarter 3-2007 Quarter 4-2007 <br /> MW-1 X <br /> MW-2 X X X X X <br /> MW-3 X X X X X <br /> MVV-4 X X X X X <br /> MW-5X <br /> MW-6 X. X X <br /> MW-7 X X X <br /> MW-8 X <br /> X— Scheduled groundwater collection event; all wells (MW-1 through MW-8)to be monitored each quarter with <br /> the following minimum data collected:depth-to-water elevation,dissolved oxygen,electrical conductivity,and pH. <br /> Groundwater samples collected from the monitoring wells will be submitted using chain-of- <br /> custody record to a State-certified laboratory. Groundwater samples will be analyzed for total <br /> TPHg by EPA Method 8015 and for BTEX and oxygenate fuel additives by EPA Method 8260B. <br /> i <br /> Page 10 <br /> w:\17861\WP forAdditional Subsurface Investigation CA <br /> e's'ceca♦ii.: .ra c: <br /> Soil Vapor Study,-and Modeling <br />