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M j. Kloberdanz & *sociates Post Office Box 576981 Modesto, CA 95357-6981 Environmental Services Phone. (209) 577-8186 Fax: (209) 577-8158 March 16, 2001 ENVIRONMENTAL HEALTH DIVISION 304 E Weber Ave Third Floor P O Box 388, Stockton CA 95201-0388 Ms Lori Duncan Approved ❑ San Joaquin County Denied Environmental Health Division Conditions P O Box 2009 Stockton, California 95201 3 �+� i�[1A,,.�..— RE Addendum - 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 an 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 February 21, 2001 letter from the Environmental Health Division 1 San Joaquin County Public Health . Services (SJCEHD/PHS) In the February 21, 2001 letter, the SJCEHD/PHS expressed concerns about the work plan addressing the vertical and lateral extent of the soil and groundwater contamination at the site Specifically, the SJCEHD/PHS was concerned about the vertical definition of the soil and groundwater contamination in the vicinity of previously documented soil contamination In addition, concerns were raised about the need for discrete groundwater sample collection from depths greater than the present screened well intervals Finally, the SJCEHD/PHS requested analysis of all soil and groundwater samples for petroleum hydrocarbons by EPA Method 8015m, volatile aromatic hydrocarbons (benzene, toluene, ethyl benzene, and xylenes) by EPA Method 8020 (8021B), and fuel additives and oxygenates including 1,2 dichlorethane, ethylene dibromide, ethanol, and methanol by EPA Method 8260 This addendum proposes to add an additional drilling location to address the concerns about vertical definition in areas of previously documented soil contamination An additional test boring is proposed in the vicinity of boring B1 (see attached site map) Geologic logging and soil / water sample collection and analysis will be conducted from the base of the previous boring to total depth of the test hole Access to several of the borehole locations proposed in the January 18, 2001 work plan is extremely restricted and use of a limited access Geoprobe, direct push, drill rig will be required The smaller limited access type drill rigs do not have the capability to drill to iextended depths Construction of deep test holes will require the relocation of fences and