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++NI y M.J. Kloberdanz & associates . Post Office Box 576981 Modesto, CA 95357-6981 Environmental Services Phone. (209) 577-8186 Fax. (209) 577-8158 May 17, 2001 Ms Lon Duncan - San Joaquin County Environmental Health Division P O Box 2009 Stockton, California 95201 RE Addendum II- Work Plan, Subsurface Soil and Groundwater Investigation III, Ripona Market, 223 West Washington Street, Ripon, California On behalf of Nagab G (Mike) Elsumeri, M J Kloberdanz and Associates is pleased to submit a second addendum to the Work Plan, Subsurface Soil and Groundwater Investigation III, Ripona Market, 223 West Washington Street, Ripon, California (M J Kloberdanz and Associates, January 18, 2001) in compliance with the directives of the March 30, 2001 letter from the Environmental Health Division / San Joaquin County Public Health Services (SJCEHD/PHS) In the March 30, 2001 letter, the SJCEHD/PHS expressed concerns about the March 16, 2001 addendum to the work plan which proposed using a Geoprobe to define the vertical and lateral extent of the soil and groundwater contamination at the site The letter requested that other alternatives for drilling be evaluated The use of Cone Penetrometer Testing technology for soil and groundwater sampling was examined The procedure, as described by a drilling contractor, follows "The work is completed using a 25 ton CPT rig and accompanying support ng The dead weight of the CPT ng is used as a reaction to push the cone penetrometer using a hydraulic ram Iocated at the center of the truck Soil parameters such as Cone bearing, sleeve friction, friction ratio, pore water pressure are measured as the cone penetrometer is advanced These measurements are sent uphole through the cone rods to an on-board data acquisition system All data is processed in real time in the field so that decisions can be made by the field geologist CPT plots of tip resistance, sleeve friction, friction ratio and pore pressure are provided in the field along with a table of interpreted soil parameters " "After completion of the CPT sounding, a Hydropunch type groundwater sample is taken at the desired depth interval The Hydropunch type sampler operates by pushing 1 75 inch diameter hollow rods with a steel tip to the desired depth A filter screen is attached to the tip At the sampling depth, the rods are retracted, exposing the filter screen and allowing for groundwater infiltration A small diameter bailer is then used to collect groundwater samples through the hollow rod " "The soil sampling is conducted using a piston sampler The closed sampler will be pushed to the desired depth at which point it will be locked into the open position