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�a39 Cambridge Road <br /> Suite 220 <br /> Cuneron Park, CA 9.5682-9007 <br /> f'rl. X580_ ,26.6884 <br /> IT /7.aa1 s30.6�4885 <br /> the Uu "9 UG 25 P1112: 54 <br /> J August 23, 1999 <br /> Project 791701 <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Ave Third Floor <br /> Stockton, California 95201 <br /> Re: Site Assessment VNTorkplan Addendum,-ARCO Facility No. 2186, 3212 N._ <br /> California, Stockton, California <br /> Dear Ms. Oz: <br /> Pinnacle Environmental Solutions, a member of The IT Group (Pinnacle) is submitting <br /> this workplan addendum for the above referenced site on behalf of ARCO Products <br /> Company. The April 15, 1999 Workplan to Further Assess Hydrocarbon-Impacted Soil <br /> and 'Groundwater (Pinnacle) proposed cone penetrometer testing to assess subsurface <br /> conditions. In order to assess the lateral and vertical extent of impacts to soil, Pinnacle <br /> will now collect soil samples at five-foot intervals. CPT profiles will not be performed. <br /> The. .change in scope will allow evaluation of soil impacts during this phase of <br /> investigation. <br /> Three to four soil samples per boring will be submitted to a state certified analytical <br /> laboratory (Sequoia Analytical) and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHG) and the gasoline constituents benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX) using U.S. Environmental Protection Agency Methods 8015/8020 to <br /> provide information for additional lateral and vertical plume definition. Additionally, <br /> these samples will be analyzed using Method 8260 for MTBE and other oxygenates. <br /> Samples submitted for analysis will be selected based upon field observations and results <br /> of prior site assessments. Soil samples not submitted for hydrocarbon analysis will be <br /> retained for possible use in evaluating soil properties including permeability and porosity. <br /> If you have any questions, please call. <br /> Sincerely, <br /> Pinnacle <br /> J <br /> Mark'Capps, R.G. Joel Coffman <br /> Project Geologist Senior Project Supervisor <br /> cc: Paul Supple, ARCO Products Company <br />