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i • Apiptleaa!bbysrsms/rrc _ —_ _ A RFSNA Company - i110 T Wr . .I U L. 2 4 9992 Environmental Solutions Through Applied Science, 3164 Cold Camp Drive, Suite 200 ENVIR01WENTAL HEALTH Engineering&Construction Rancho Cordova, CA 95670 PERMIT/SERVICES Phone (916) 8S2-6690 FAX (916) 852-6688 July 21, 1992 Mr. Michael Infurna San Joaquin County Public Health Services P O Box 2009 Stockton, California 95201 Subject Modification to Second Addendum to Workplan for an Air Sparging Pilot Test at ARCO Service Station No 2130, 7906 North El Dorado Street, Stockton, California Mr. Infurna- At the request of ARCO Products Company(ARCO), RESNA initially proposed to perform an air sparging pilot test at the subject site in our Second Addendum to Workplan dated • June 11, 1992 As you requested on July 13th, enclosed for your review are geologic cross- sections of the proposed pilot sparging zone (Plates 1 and 2) The locations of the cross sections are shown on the Generalized Site Plan (Plate 3) The cross sections indicate that the sediments overlying the ground water table are predominantly silt based, relatively homogeneous and void of lithologic units that could preclude the vertical migration of vapors in the vadose zone These cross sections will be modified to the field as new borings are dnlled and logged. As you also requested, in order to obtain a maximum amount of subsurface geologic information, borings drilled for the purpose of construction of onsite vaporextraction and ground-water monitoring wells will be drilled prior to borings for the sparge program Final construction recommendations relative to sparge facilities will be made in the field based upon a final review of the geologic cross sections, these field recommendations will be presented to you for concurrence f. Mominf 30003-8