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--�- <br /> A RESNA Company �--•-�- <br /> Environmental Solutions <br /> Through Applied Science, <br /> 3164 Gold Camp Drive, Suite 200 �y 'F sR r` Engineering & Construction <br /> J <br /> Rancho Cordova, CA 95670 " <br /> Phone (916) 852 -6690 <br /> FAX (916) 852 -6688 <br /> December 6 , 1991 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Telephone Conversation Regarding Addendum to Work Plan for a Subsurface <br /> Investigation at ARCO Service Station No. 2130, 7906 North El Dorado <br /> Street, Stockton, California. <br /> Mr. Infurna: <br /> As we discussed in our telephone conversation of December 4, 1991, we modified the vapor- <br /> well construction to include factory perforated casing with 0. 10-inch slots in our Addendum <br /> to Work Plan dated November 18, 1991. The vapor-extraction well construction discussed <br /> in our original Work Plan dated May 177 1991 states No. 3 sand will be placed in the <br /> annular place opposite the screen. Pea gravel, not No. 3 sand will be placed in the annular <br /> space opposite the screen sections of the vapor-extraction wells for the proposed work <br /> scheduled to begin December 16, 1991. Soil borings converted to vapor-extraction wells will <br /> be terminated at 10 feet above ground water or when two consecutive soil samples with <br /> photoionization detector readings below 50 parts per million by volume are collected below <br /> 25 feet below grade. The screen intervals will be selected according to field evidence of <br /> hydrocarbons in soil from each boring. We also discussed that the vapor-extraction test will <br /> be limited to one day. Please call if you have any questions regarding this letter or our <br /> Addendum to our Work Plan. <br /> Sincerely, <br /> RESNA Industries <br /> Eloise F. Cherven <br /> Project Geologist / <br /> 4� /V G10 <br /> Richard H. Walls <br /> P:E. 43139 <br /> cc: Mr. Chuck Carmel, ARCO Products Company <br /> 1204m;ne <br /> 30003-4 <br />