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Advanced <br /> GeoEnvironmental , Inc . .- == <br /> 02 November 2009 <br /> AGE-NC Project No. 09-1692 REC�L NED <br /> NOVl <br /> Kristi Shelton u 3LC 20009 <br /> California Regional Water Quality Control Board - Central Valley Region ENVIRONMENT NEAMI <br /> 11020 Sun Center Drive#200 PERMIT/SERVICES <br /> Rancho Cordova, California <br /> Subject: Additional Site Assessment Work Plan-Addendum <br /> IDEALEASE <br /> 1137 South Stockton Street, Stockton, California <br /> Dear Ms. Shelton: <br /> At the request of Idealease,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed <br /> Additional Site Assessment Work Plan-Addendum for the property located at 1137 South Stockton <br /> Street, Stockton, California. The location of the site is illustrated in Figure 1. <br /> This letter addends the AGE-prepared Additional Site Assessment Work Plan, dated <br /> 22 September 2009 as requiredbythe California Regional Water Quality Control Board(CRWQCB) <br /> letter, dated 15 October 2009 (Appendix A). In the original scope of work, AGE detailed <br /> advancement of one shallow soil boring and ten"deep"soil borings for collection of soil and ground <br /> water samples.Additionally,four of the"deep"borings would be advanced with hollow stem augers <br /> and converted into ground water monitoring wells. Soil boring types and locations are illustrated on <br /> Figure 2. <br /> AGE proposed to advance the shallow soil boring to a depth of approximately 10 feet bsg and deep ' <br /> borings to a depth of approximately 30 feet bsg or until soil samples no longer demonstrate <br /> hydrocarbon impact. As borings are advanced, soil samples will be collected at discreet five-foot <br /> intervals,beginning at 5 feet bsg, and continuing to the total soil boring depth. Termination of deep <br /> soil borings will be determined using the following field observations: <br /> • Soil samples will be visually inspected by an AGE representative under the supervision of <br /> a California Professional Geologist.Hydrocarbon-impacted soil will be identified by either <br /> discoloration or an obvious hydrocarbon odor in the soil samples. <br /> • Soil samples will be field-screened for the presence of semi-volatile organic compounds <br /> using an organic vapor meter (OVM), equipped with a flame ionization detector (FID) <br /> calibrated to methane gas.Hydrocarbon-impacted soil will be identified by elevated organic <br /> vapor concentrations. <br /> 837 Shaw Road, Stockton,CA 95215 <br /> Telephone(209)467-1006 •Fax(209)467-1118 <br />