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Advanced <br /> GeoEnvironmental Inc . <br /> 06 June 1998 <br /> AGE-NC Project No. 95-0142 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave. Third.Floor <br /> Mr. Harlin Knoll R O. Box 388, 5 ockton CA 95201-0388 <br /> El <br /> San Joaquin County PHS-EHD Denied <br /> P. O. Box 388 Conditions cL.--.- 2& <br /> Stockton, CA 95201 C.Cca�►. c.,ti�Q <br /> Date by <br /> Subject: Work Plans for Depth Discrete- Hydrocarbon Assessment <br /> STOCKTON PLATING <br /> 632 South El Dorado Street, Stockton, California <br /> Dear Mr. Knoll: <br /> In accordance with a request from Mr. Jeff Setness of HARTMANN & SETNT ESS. Advanced <br /> GeoEnvironmental, Inc. (AGE)has prepared this work plan for dissolved hydrocarbon assessrntnt <br /> for the site located at 632 South E1 Dorado Street, Stcckton, California (the site). <br /> SOIL BORING AND SAMPLING RESULTS <br /> On 22 April 1998, three hydro-punch grab water samples were collected from the site. Additional <br /> one soil boring was established in the area of the former UST TK1-90. The soil baring was advanced <br /> to a total depth of 70 feet below surface grade(bsg). Soil samples were collected from depth between <br /> 40 feet and 70 feet bsg. <br /> Soil encountered at a depth of 45 and 60 feet demonstrated the highest concentration of <br /> hydrocarbons. While hydrocarbons detected at depth of 50 feet and 55 feet bsg were lowest detected <br /> in the soil samples analyzed. This zone of lower concentration is a possible indication of a water <br /> level indicator over a significant duration,thus diluting or diffusing the hydrocarbons in contact with <br /> the soil at these depths. A copy of the data is attached and the data will be supplied in following <br /> quarterly report. <br /> SCOPE OF WORK <br /> Based on the depth of hydrocarbon impacted soils,additional depth discrete wells should be installed <br /> if the vertical definition of hydrocarbons is required for the site. Therefore AGE recommends the <br /> installation of three additional wells on the site. <br /> 4005 North Wilson Way, Stockton.California 95205 <br /> Telephone(209)467-1006 FAX(209) 467-1118 <br />