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PUBLIC HEALTH SEXVICES �op �a <br /> SAN JOAQUIN COUNTY a z� <br /> { JOGI KHANNA M.U..M.P.H. <br /> Health Officer • �, �a <br /> 4CFORe+ <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 9 Stockton, California 95201 <br /> (209) 468-3400 <br /> CC l , <br /> { # <br /> 'F. JUAN QUIJANO <br /> TRI VALLEY GROWERS <br /> P 0 BOX 1211 <br /> AUG 10 1993 <br /> MODESTO CA 95353 3 <br /> ' RE: 11 SOUTH A STREET SITE CODE: 2040 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> completed the review of the workplan for the over-excavation of the former underground <br /> gasoline tank pit area dated July 1, 1993, submitted by Thomas Vogel and Associates, and <br /> has the following comments. <br /> a <br /> San Joaquin County Flood Control maps (1983/1986) show seasonal high groundwater levels <br /> to be approximately 40 feet below ground surface for this area. The proposed total depth <br /> of the excavation is 28 feet below ground surface. Due to the close proximity of possible <br /> i <br /> remaining soil contamination to seasonal high groundwker and in order for PHS/EHD to <br /> consider this site for closure, the over-excavation proposed for this site must successfully <br /> remove all detectable levels of benzene, toluene, ethylbenzene and xylenes and remove any <br /> total petroleum hydrocarbons as gasoline at concentrations over 10 parts per million (ppm) . <br /> in the soil. 'p <br /> Should the over-excavation activities fail to achieve the above noted goals, a groundwater <br /> a investigation to determine the quality of the groundwater in the area of the former gasoline <br /> tank may be required before this site can be considered for closure. <br /> 1 <br /> A minimum of four soil samples will be required from the finished excavation to confirm the <br /> removal of the impacted soils. These soil samples should be analyzed for total petroleum <br /> hydrocarbons as gasoline (EPA method 5030/8015) and benzene, toluene, ethylbenzene and <br /> total xylene (EPA method 5030/8020). The laboratory, should obtain minimum detection <br /> limits of 10 ppm for total petroleum hydrocarbons as gasoline and 0.005 ppm for benzene, <br /> toluene,ethylbenzene and xylene. Should circumstances'during the over-excavation activities j <br /> warrant, additional soil samples may be required. x <br /> 3j <br /> +' PHS/EHD must provide public notification of the proposed corrective action to the school <br /> located adjacent to this site pursuant to Section 2728, Chapter 16 of the California Code of <br /> Regulations. PHS/EHD will provide notification to you as to when the public notification <br /> } process has been completed so that the proposed work can be scheduled. <br /> i <br /> A Division of San loaquin'Counry Health Care Scmces T <br /> I <br /> r` <br />