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PUBLIC HEALTH SEXVICES °Pali, c <br /> SAN JOAQUIN COL NTY <br /> JOGI KHANNA M.D.,M.P.H. N: ` u A <br /> Health Officer <br /> Cq•. :P <br /> P.Q. Box 2009 . (1601 East Hazelton Avenue) e Stockton,California 95201 <br /> (209) 468-34 0 <br /> July 25, 1989 <br /> ARCO Products Company C(DIPY <br /> Attn: Kyle Christie <br /> P. 0. Box 5811 <br /> San Mateo, CA 94403 <br /> RE: 501 E. KETTLEMAN LANE; LODI SITE CODE #1341 <br /> SUBSURFACE INVESTIGATIVE WORK PLAN <br /> Please be advised that this office has reviewed the above referenced <br /> work plan. We have found the plan to be adequate provided the <br /> following considerations are addressed in the Preliminary Site <br /> Assessment Report. <br /> Soil Characterization Work <br /> 1. The extent of contaminated soil west and north of borehole B-2 <br /> has not been defined. There is a zone of highly contaminated soil <br /> (hazardous waste levels) immediately above the ground water surface <br /> that has not been delineated. We agree, that it may have been <br /> transported there on groundwater or the capillary fringe, but the <br /> source of the contamination was the leaking product line at the ARCO <br /> station. We recommend that the lateral and vertical distribution of <br /> the contaminants in the soil be accurately delineated. <br /> 2. We have no objection to Brown and aldwell' s request not to take <br /> vapor meter readings on the nine continuous core samples. <br /> Proposed Modification to the Soil Characterization Work <br /> 1 . Brown and Caldwell proposes to screen vapor recovery wells from 7 <br /> to 45- feet below grade, and have supplied no rationale for selecting <br /> this interval. Discreet screened intervals placed at zones of <br /> contamination would facilitate a more efficient and cost effective , <br /> soil remediation. We recommend that analytical results of soil <br /> samples be used to identify the zones of contamination and the <br /> screened intervals should be designed accordingly. The continuous <br /> core samples may make it possible to design the screen interval of <br /> each well based on field data. Brown and Caldwell plan to use field <br /> evidence to select the boreholes for vapor recovery well <br /> installations. We suggest that this field evidence also be used to <br /> select the best screen interval (s) for each well. <br /> It should be noted that the installation of these vapor recovery <br /> wells proposes initiating a soil remedial action plan prior to <br /> identifying the problem. Operation - of the system could not begin <br /> until the soil problem has been related to the leak source and ground : <br /> water. <br /> A Division of San Joaquin County Hc alth Care Services <br />