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Aug-23-99 04: 14P Pinnacle/EMCON P_02 <br /> °`i � . 9d4(;;unlrrif�r•Nn:rd <br /> f.jr(nrrrrrr l,rr6. f;a <br /> • 741 31),656.(AH l <br /> f-:�.�..i.3(l.67Ir.f�BN:x <br /> ti t< <br /> August 23, 1999 <br /> Project 791701 <br /> Ms. Carol Or. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Wcbcr Ave Third P`loor <br /> Stockton,California 95201. <br /> Re: Sitc Assessment Workplan 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 Groundwaler (Pinnacle) proposed cone penetrometer testing to assess subsurface <br /> conditions. in order to assess the lateral and vertical extent or impacts to soil, Pinnacle <br /> will now collect soil samples at Eve-foot intervals. CPT prcifilcs will not be performed. <br /> The change in scope will allow evaluation of soil impacts during this phase of <br /> investigation. <br /> Thrce: to four soil samples per herring 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 bcmz'cne, toluene, ethylhenzene and total <br /> xylenes (B,rEX) 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 submilted 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 /> 4l <br /> Mark Capps, R.G. Joel Coffman <br /> Project Geologist Senior Protect Supervisor <br /> CC' Paul Supple, ARCO Products Company <br />