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Advanced vow, <br /> GeoEnvironme <br /> 0rti1 i , 2007 <br /> 15 October 2007 ENVIRONUIEIII i HEALI H <br /> AGE-NC Project No. 97-0300 pERMITJSERV110ES <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Addendum to Work Plan, dated 20 September 2007 <br /> PACIFIC PRIDE -WEST LANE <br /> 3230 North West Lane, Stockton, CA <br /> Dear Ms. McCartney: <br /> In accordance with a recent telephone conversation(03 October 2007)with the San Joaquin County <br /> Environmental Health Department (SJCEHD), Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this addendum to the above referenced Work Plan Addendum- Third Quarter 2007,dated <br /> 20 September 2007. <br /> The scope of work for the above work plan included advancing three (3) shallow soil borings to <br /> approximately 5 feet below surface grade (bsg) for collection of soil-gas samples. During the <br /> aforementioned telephone conversation,the SJCEHD requested that a letter addendum be submitted <br /> that incorporated a reliable `leak detection' method during collection of soil-gas samples. <br /> AGE proposes to utilize 70% isopropyl alcohol (rubbing alcohol) as a leak detection tracer <br /> compound to ensure that a reliable soil-gas sample is collected from each soil boring with no <br /> ambient air breakthrough down the probe rod. AGE will apply an appropriate amount of rubbing <br /> alcohol (approximately 8 ounces) to adequately wet a cotton towel; the wetted towel will be <br /> completely wrapped around the base of the probe rod where it contacts the surface and the bentonite <br /> seal. Thereafter,a soil-gas sample will be collected as described in the above-referenced Work Plan <br /> Addendum. <br /> Isopropyl alcohol will be added to the laboratory analysis(EPA Method 8015M)listed in the Work <br /> Plan Addendum and will verify the validity of each sample.Utilization of isopropyl alcohol as a leak <br /> detection method was referenced in Technical and Regulatory Guidance, Vapor Intrusion Pathway: <br /> A Practical Guideline,prepared by the Interstate Technology&Regulatory Council(January 2007). <br /> 837 Shaw Road, Stockton,California 95215 <br /> Telephone(209)467-1006 Fax(209)467-1118 <br />