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v9 <br /> GROUND ZERO ANALYSIS, INC. <br /> 2291 W. March Lane, Suite 127D <br /> Stockton, California 95207 <br /> Telephone: (209) 952-3481 <br /> Facsimile: (209) 952-9892 <br /> December 3, 1996 <br /> Mr. Doug Wilson <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Addendum to Workplan for Soil Sampling at Roy's Towing <br /> 3570 East Miner Avenue, Stockton, California <br /> Dear Mr. Wilson: <br /> On behalf of Roy and Norma Knoll we are writing in response to your October 30 letter <br /> regarding soil sampling at the subject property. In order to address your comments and to <br /> comply with the Court Order we are submitting this addendum to our September 30 Workplan. <br /> Our responses and modifications to the proposed work are as follows: <br /> 1. All samples will be submitted to the laboratory for analysis. <br /> 2. The septic tank underlying the building foundation will be accessed and samples of the <br /> liquid and sludge contained therein will be collected for laboratory analysis. Pending the <br /> results of analysis any septic tank contents pumped will be properly disposed of. <br /> 3. Should random sampling locations underlie vehicles or debris, these will be moved in <br /> order to collect samples. Focused samples adjacent to areas of suspected contamination <br /> east of the property were proposed in the Workplan. <br /> 4. Samples collected from the septic tank and from the sump and leachfield area will be <br /> analyzed for the following substances in addition to TRPH and total lead: <br /> • Total petroleum hydrocarbons as gasoline, EPA method 8015 <br /> • Total petroleum hydrocarbons as diesel, EPA method 8015 <br /> • Volatile Organics, EPA method 8240 <br /> As we discussed over the phone it would be redundant to analyze samples for solvents by both <br /> method 8010 and 8240. The 8240 method also includes the BTEX consituents typically analyzed <br /> by method 8020. Therefore, we propose to delete methods 8010 and 8020 from the suite of analyses. <br />