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Rug-;23-99 04, 25P Pinnacle/EMCON P.02 <br /> � t <br /> 31,3t1 Cantbi nigt !io A <br /> tiutEt 220 <br /> G,rrttrrorr r'trrlc, C4 95682 r)W7 <br /> Tel 5 W 676 6881 <br /> � A Fax 530 676 (W85 the <br /> 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 Workplan Addendum, ARCD 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 an 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 asses 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 /> ti 1° The change in scope. will allow evaluaticin of boil impacts during this phase of <br /> investigation. <br /> 1brec to four soil samples per boring will be submitted to a state certifiers analytical <br /> laboratory (Sequoia Analytical) and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHG) and the gasoline constituents benzene, toluene, cthylbenzcrne 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 othcx 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 <br /> an ysis it bei <br /> rewned for possible use in evaluating soil properties including permeability ands <br /> y <br /> if you have any questions,please call. <br /> Sincerely, <br /> Pinnacle <br /> \'_�WVWVV____ <br /> t�� <br /> Mark " R G 3oel Coffman <br /> Capps, Senior project Supervisor <br /> Project 00010914' <br /> ,, cc Paul Supple, ARCO Products Company <br />