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rIN <br /> 4 —6FIEl4 P . J_ <br /> *""'�RISNA Company £ll VirpnmP�tat Suluffons <br /> Through Applied Science, <br /> J 164 Gold Camp Drive,Suite 200 Ertrinccri..•A Cuusfruellon <br /> RanchU Cordovs,CA 9Sf„0 <br /> Phone(916)852-6690 <br /> FAX 1910)&;2-6688 <br /> December 6, 1991 <br /> Mr. Mike Infurna <br /> Sar: Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2000 <br /> Stockton, CA 95201 <br /> Subject: 1'eleplrur. Com ersation Regarding Addendum to Work flan for a Subsurface <br /> lttvestig;:: at ARCO Service Station No. 2130, 7906 North EI Dorado <br /> Street, Stockton, California. <br /> c <br /> E <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 /> Y to Work flan dated November 18, 1991. The vapor-extraction well construction discussed <br /> in our original Work Plan dated May 17, 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 rr.- - 4 work <br /> scheduled to begin December 16, 1991. Soil borings converted to vapor-eV ills will <br /> be terminated at 10 feet above ground water or when two consecutive su; ..aples with <br /> photoionization d,.tector readings below 50 parts per million by volume are collected below <br /> s <br /> 25 feet below grade. 'f lie screen intervals will be selected according to field evidence of <br /> hydrocarbons in soil from each buring, We also di!cussed that the vapor-extractior test will <br /> i be limited to one day. 1'1case call if you have any questions regarding this letter or our <br /> Addendum to our Work Plan. <br /> 6 <br /> Sincerely, <br /> RESNA Industries <br /> Eloise F. Cherven <br /> Project (geologist <br /> T <br /> Walls— <br /> P.E. 43139 <br /> 's <br /> + cc: Mr. Chuck Carmel, ARCO Products Company ;f , <br /> 1204minf <br /> 30003.4 <br />