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Advanced <br /> GeoEnvironmental, Inc . - - <br /> 09 July 2007 <br /> AGE-NC Project No. 95-0106 ��,� <br /> Ms. Vickie McCartney <br /> San Joaquin <br /> Main County <br /> Environmental Health Department PCR�O V lilavr <br /> 600 <br /> Stockton, California <br /> Subject: Soil Vapor Survey Work Plan -Addendum <br /> WELDON CHURCH PROPERTY <br /> 104 West Beverly Place,Tracy, California <br /> Dear Ms. McCartney: <br /> At the request of Mr. Weldon Church,Advanced GeoEnvironmental, Inc. (AGE) has prepared the <br /> enclosed Soil Vapor Survey Work Plan-Addendum for 104 West Beverly Place,Tracy,California. <br /> The location of the site is illustrated on Figure 1. This addendum proposes to modify the scope of <br /> work of the original AGE prepared Soil Vapor Survey Work Plan dated 25 April 2007.In the original <br /> scope of work, AGE proposed to advance fifteen soil borings for collection of soil and soil vapor <br /> samples to determine the lateral extent of petroleum hydrocarbon-impact to soil present beneath the <br /> site and assess the threat of vapor intrusion to the house located near the source area. <br /> AGE will make the following modifications to the original work plan as directed in the San Joaquin 04. <br /> °t <br /> County Environmental Health Department(EHD) letter dated 23 May 2007 (Appendix A): a �- <br /> E d rL,s <br /> • <br /> Soil vapor samples will be analyzed for total petroleum hydrocarbons as gasoline�fPH-g), <br /> benzene,toluene, ethylbenzene and xylenes (BTEX), and naphthalene and methyl tertiary- <br /> butyl ether(MTBE). <br /> • For soil collection and analysis, instead of advancing borings to three feet below surface <br /> grade (bsg) to collect one soil sample, continuous cores to six feet will be collected to <br /> provide information from the capillary fringe. <br /> In addition,AGE proposes to eliminate the borings along the north(front)side of the house for the <br /> following reasons: <br /> • The highest concentrations of adsorbed petroleum hydrocarbons in soil are along the south <br /> (back) and east side of the house, nearest the former underground fuel storage tank. If any <br /> petroleum hydrocarbon-impact is detected in soil vapor, it would be greatest in these areas; <br /> 837 Shaw Road, Stockton,California 95215 <br /> `telephone(209)467-1006 Fax(209)467-1118 <br />