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PUBLIC HEALTH SERVICES 0�� SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. San Joaquin Street • P O. Box 388 • Stockton, CA 95201-0388 c�4;1)PO ft - 209/468-3420 STEPHEN VALENTINE 6232 HEMET AVE r STOCKTON CA 95207 r` 1 Z r1 E995 RE Steve and Gene's Service SITE CODE 2080 2315 North El Dorado Street Stockton CA San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the March 1995 "Workplan for placing two(2) Groundwater Monitoring Wells at 2315 North El Dorado Street, Stockton CA, Site Code 2080" prepared by William J Hunter and Associates for the above referenced site The workplan describes the recent soil and groundwater investigation, the history of the site, and a workplan for installing two additional 2 inch diameter monitoring wells The workplan states on page 3 that"the highest water level in the last 10 years was measured at about 27 inches bgl 2 at this site " The 1986 San Joaquin County Water Level and Flood Control Map indicates a water level of approximately 35 feet Section 2649(d)(3)of Title 23 Chapter 16 Article 4 of the California Code of Regulations (CCR) states "Groundwater monitoring well casings shall extend to the bottom of the boring and shall be factory- perforated from a point of one foot above the bottom of the casing to an elevation which is either 5 feet above the highest anticipated groundwater level or to within three feet of the bottom of the surface seal or to the ground surface whichever is the lowest elevation " Plate V of the workplan depicts 53 feet as the Indicated water table with perforated casing extending to 48 feet Depth to water measurements were taken on March 17, 1995 from MW-1 at the site At that time the groundwater was measured as being 48 41 feet below ground surface This monitoring well is perforated from 55 to 70 feet PHS/EHD recommends that all well construction at this site comply with CCR 2649 The workplan states on page 5 section 2 that soil samples will be taken at 5 foot intervals from 10 feet below grade to the capillary fringe and that one tube from each sample will be preserved for analysis PHS/EHD recommends that samples submitted for analysis be based upon field screening with a PID or other suitable method The previous investigation was for waste oil which may not be volatile enough to register on a PID indicating a need to analyze all samples Since the waste oil investigation resulted in detecting gasoline and BTEX, field screening is indicated for submittal of vadose zone samples to the lab for analysis Page 5 section 4 of the workplan states that the well will be installed 10 feet below the water table CCR Section 2649(d)(1) states "Groundwater monitoring wells shall extend at least 20 feet below the lowest anticipated ground water level however wells shall not extend through laterally extensive impermeable zones that are below the water table and that are at least five feet thick In these situations, the well shall be terminated one to two feet into the impermeable zone" PHS/EHD recommends that all well construction at this site comply with CCR section 2649 At this time PHS/EHD recommended detection limits are 50 parts per billion(ppb) for total petroleum hydrocarbons as gasoline, 3 ppb for Benzene, Toluene and Ethylbenzene, and 6 ppb for Xylenes RECEIVED Ai R 1 2 1995 A Division of San Joaquin County Health Care Services