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I <br /> PUBLIC HEALTH SERVICES ,o¢°��..�o <br /> SAINJOAQUIN COUNTY <br /> ' JOGI KHANNA 11.D.,M.P.H. <br /> Health Officer q. P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stolon, California 95201 <br /> (209) 468-3400 <br /> SCOTT VINCENT i <br /> AMERICAN REAL ESTATE GROUP <br /> 3102 OAK LAWN STE 900 i JUL 1 V1199 <br /> DALLAS TX 75219 I �. <br /> � RE: 1235 E. Alpine SITE CODE: 1512 I� ,,- <br /> Stockton, CA ipk <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division has reviewed the Quarterly Monitoring Report dated May <br /> 1992, submitted by Woodward-Clyde Consultants:� and has the <br /> following comments. <br /> As noted in a letter from this office to American Real Estate <br /> Group dated November 12, 1991, the stockpiledisoil may be used to <br /> backfill the open tank excavation, with the understanding that <br /> the soil is to be remediated in-situ along with the contaminated <br /> soils in the deeper zone in that area. <br /> Because the soluble lead was extracted with an acidic solution, <br /> the levels of soluble lead, as noted in the quarterly report, may <br /> not be indicative of actual site specif is"' soluble lead levels. A <br /> �' repeat analysis for soluble lead can be accomplished during the <br /> f drilling and sampling of the proposed vapor extraction well, in <br /> the center of the former tank pit area. <br /> To better simulate site conditions, the soluble leadshould be <br /> extracted with a deionized water solution'. Using deionized water <br /> to extract the soluble lead will better represent site <br /> conditions, should yield lower soluble lead results and may <br /> indicate that the total lead levels remaining, in place are not a <br /> threat to groundwater. The results of the water sampling of the <br /> three monitoring wells at this site indicate ,that groundwater has <br /> not been impacted, to date, by lead. it <br /> ilil <br /> A workplan to install the proposed additional monitoring wells <br /> and the vapor extraction well can be included in the next <br /> quarterly status report as suggested by Jay K`amine of Woodward- <br /> Clyde Consultants in a telephone conversation with this office on <br /> June 25, 1992. Work addressing the contimincition documented in <br /> the former piping trenches may also be included in the workplan. <br /> Any necessary access agreements, permit appllpcation(s) and <br /> associated fees should be submitted along with the workplan. <br /> E <br /> A Division of San Joaquin County Heai[h Care Se>gices <br />