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'UNHUENTIAL PUBLIC 4EALTH SERV CES SAM JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. Sanoa uin Street • P.O. Box 388 Stockton CA 95201-0388 J q , (209) 468-3420 17 SHAUN KELLEY SEP 13 1994 CONFIDENTIAL M & M BUILDER'S SUPPLY P O BOX 1107 TRACY CA 95378-1107 RE: 8111 W ELEVENTH ST; TRACY UNDERGROUND TANK REMOVAL OF JUNE 23, 1994 Yesterday afternoon, Mr. Lopez came into the PHS-EHD office to inquire as to our decision on the contamination issue and whether the tank excavation could be backfilled. The purpose of my letter to you is two-fold; I will attempt a chronology of the events as I know them for clarification and secondly, I wish to express some concern regarding Mr. Lopez' actions while he was in our department on your company's behalf. On June 23, 1994, a 1000 gallon unleaded gasoline underground storage tank (UST) was removed from the above reference facility and the required soil and groundwater sampling was witnessed by Mr. Bill Snavely, Senior R.E.H.S. of the San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD). li PHS-EHD received the completed tank removal report as prepared by Dillard Environmental Services on July 22, 1994. Mr. Snavely discussed with me options available to you regarding the subsequent groundwater sample that evidenced contamination. As it was possible that sloughed soil within the tank excavation influenced the outcome to the "grab" groundwater sample, our recommendation was to pump out a significant amount of the groundwater to allow for recharge within the tank excavation, and then collect a more representative sample for laboratory testing. i ,i Mr. Snavely was present for the collection of the groundwater sample, however at the time of his visit he had not understood that groundwater had been removed from the excavation. Mr. Snavely had discussed the groundwater pumping with representatives from Dillard Environmental Services rather than with Mr. Lopez, a representative from your company. i Mr. Lopez initially met and discussed the site with Ms. Margaret Lagorio, Lead Senior of the Site Mitigation Unit. Ms. Lagorio being unfamiliar with the sampling events, excused herself from the reception area to discuss the site with Mr. Snavely. Mr. Snavely, Ms. Lagorio and I met with Mr. Lopez and after much discussion and confusion, we concluded that PHS-EHD had not received the laboratory sampling results for the July 28, 1994 groundwater resampling, Dillard Environmental Services had not performed the groundwater removal, and that Mr:!Lopez had removed the groundwater himself. Evidently, Dillard Environmental Services was unaware of this fact when Mr. Snavely had inquired at the July 28 resampling event ` a s In any case, once this fact had been established, I asked Mr. Lopez to prepare a written explanation of how the groundwater had been removed from the tank excavation,!where the groundwater had been discharged, and how frequently this removal took place in order to`iallow for the recharge activity. Mr. Lopez had mentioned that he was able to water down a portion of the building yard with the groundwater from the excavation and that it took approximately one hour for the groundwater to recharge. A f)msion of San Joaquin County Health Care Services CONFIDENTIAL i( r