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Harding Lawson Associates <br /> �c - <br /> October 30, 1996 <br /> 36371 3 <br /> Mr. Steve Sasson <br /> San Joaquin County Public Health Services ENVIRONMENTAL HEALTH DIVISION <br /> Environmental Health Division 304 E. Weber Ave.Third Floor <br /> 304 East Weber P. O. Box 388, Stoc ton CA 95201-0388 <br /> Stockton, California 95202 Approved <br /> Denied 0 <br /> Conditions <br /> Work Plan Addendum <br /> Additional Phase II Field Investigation Date / <br /> Train Property <br /> Tracy, California <br /> Dear Mr. Sasson: <br /> INTRODUCTION <br /> On behalf of Teichert Aggregates, Harding Lawson Associates (HLA) submits this Work Plan <br /> Addendum to drill and sample four to eight soil borings at the property located at 29900 <br /> MacAurthur Drive in Tracy, California. The property is referred to as the Traina Property. HLA's <br /> September 24, 1996 Work Plan(HLA, 1996) was submitted to the San Joaquin County Public Health <br /> Services, Environmental Health Division(SJCEHD) and approved by Mr. Steve Sasson. <br /> During HLA's Phase II Investigation performed on October 21, 1996 subjective evidence of impacted <br /> soil conditions were encountered in the boring advanced at the former UST location. Final <br /> analytical data are not yet available,but preliminary data indicate that detectable concentrations of <br /> petroleum hydrocarbons are present in the soil beneath the former UST location. Teichert requested <br /> that HLA perform an additional Phase II Investigation to assess the lateral and vertical extent of <br /> impacted soil at the former UST location. HLA communicated to Mr. Sasson, of the SJCEHD, <br /> Teichert's request for additional field work, SJCEHD indicated that HLA should submit a work plan <br /> addendum, which would receive expedited review and approval. In accordance with this <br /> discussion, the same driller Mitchell Drilling Environmental will be used and has been scheduled for <br /> November 4 and 5, 1996. <br /> SCOPE OF WORK <br /> Task 1- Soil Borings <br /> To assess the lateral and vertical distribution of impacted soil, four to eight borings in the area <br /> proximal to the former UST location will be advanced to variable depths of approximately 35 feet <br /> bgs. The boring locations will be placed at variable distances from the former UST pit, and the <br /> analytical data will be used to establish concentration gradients within the impacted soil. Soil <br /> samples will be collected at minimum 5-foot intervals and at lithologic boundaries for lithologic <br /> description, volatile organic compound (VOC) screening, and potential laboratory(chemical) <br /> analysis. The samples will be collected using a 2.0-inch(inside diameter) California Modified split <br /> spoon sampler lined with three clean 6-inch long brass tubes. The sampler will be driven with a <br /> 140-pound hammer. The number of blows required to drive the sampler each six-inch interval will <br /> be recorded and used as a qualitative measure of soil density. <br /> Engineering and <br /> Environmental Services 10265 Rockingham Drive,Suite 150,Sacramento,CA 95827 916/364-0793 Fax:(916)364-5633 <br />