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PUBLIC HfALTH SERVIC'rS pOUiry <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION :< <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 FILE <br /> 209/468-3420 <br /> PETER LENZ <br /> 6465 PACIFIC AVE MAR . 91999 <br /> STOCKTON CA 95207 <br /> RE: Howard Lenz Property SITE CODE: 2181 <br /> 1648 Shaw Road <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently <br /> reviewed the file for the above referenced site, and the"Preliminary Site Investigation Report"dated <br /> December 30, 1997 that was submitted by Advanced GeoEnviron mental, Inc. (AGE), and has the <br /> following comments for your consideration and action. <br /> On October 3, 1986, two 550-gallon underground storage tanks(UST)were removed under permit and <br /> inspection from the site. Analysis of the soil sample collected from the bottom of the tank pit showed <br /> contamination of total petroleum hydrocarbons as diesel (TPHd)of 3000 parts per million (ppm). <br /> On September 18, 1997. AGE oversaw the advancement of five geoprobe soil borings to begin the <br /> investigation of the vertical and lateral extent of the hydrocarbon contamination on site. Soil boring B-1 <br /> was advanced to 65 feet below surface grade (bsg) in the apparent former UST excavation area. Soil <br /> borings B-2 through B-5 surrounded boring B-1 to the north, east and south. Soil samples were collected <br /> every five feet and selected samples were analyzed. Results of the analysis indicate that hydrocarbon <br /> contamination in soil, of both TPHd and TPH gas, is most heavily concentrated at levels to 30 feet bsg, <br /> and remains undefined to the west and north. An attempt to obtain a grab water sample from B-1 was not <br /> successful. In their report, AGE recommends further investigation of soils contamination to the north and <br /> west of the former tank pit area, and the initiation of a groundwater investigation combined with feasibility <br /> testing of remediation alternatives. <br /> PHSIEHD agrees with the recommendation of AGE. Please submit to PHS/EHD a work plan for further <br /> site investigation by May 14, 1999. <br /> If you have any questions or comments please call Lori Duncan at(209)468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Llo� CA CK t-, —V <br /> Lori Duncan, RENS A <br /> Margaret agorio., REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Bob Marty, AGE <br /> A Division of San Joaquin County Health Care Services <br />