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y� <br /> tly/6-1 <br /> PUBLIC-eHEALTH SERACES qur <br /> I1SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION = <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-038$ <br /> (209) 468-3420 <br /> MR FRANK RYAN 3 <br /> FRANK RYAN REALTY <br /> 745 DISTAL DR 199 ' <br /> LOS ALTOS CA 94022 <br /> RE: Fuller Mobile Home Paris SITE CODE: 2491 <br /> 365 East Louise <br /> Lathrop, CA 94022 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD)has reviewed the February <br /> 10, 1995 letter regarding destruction of domestic water well and the Phase II Site Characterization report dated <br /> February 23, 1995. The letter and the report were prepared by WHF Environmental and Engineering Group for <br /> the above referenced site. <br /> The report contains analytical laboratory results for Benzene, Toluene, Ethyl Benzene and Xylene (BTEX); <br /> Gasoline, Diesel,Kerosene and Motor Oil. The reported analytical results for BTEX follow proper detection limits. <br /> The reported detection limit for Gasoline exceeds the recommended detection limit as listed in the Tri-Regional <br /> Guidelines. The reported detection limit is .5 parts per million(ppm)which is 500 parts per billion(ppb). Gasoline <br /> is to be reported at a detection limit of 50 ppb. <br /> i' <br /> The reported detection limit for Diesel exceeds the recommended detection limit as Iisted in the Tri-Regional <br /> Guidelines. The reported detection limit is .1 ppm. Tri-Regional guidelines recommend 50 ppb for Total Petroleum <br /> Hydrocarbons as Diesel as the detection limit. Detection limits for Kerosene are not defined in the Leaking <br /> Underground Fuel Tank (LUFT) manual or the Tri-Regional guidelines. PHS/EHD recommends Kerosene to be <br /> analyzed to the same detection limit as Diesel. <br /> MW-7 is *e well with the lowest concentration of Diesel. The concentration of Diesel in this well is 200 ppb. <br /> This well is located south of the western storm pond. MW-4 is located offsite on Bizzibe Street. This well has a <br /> concentration of 400 ppb of Diesel: The concentration of diesel in MW-5 is 800 ppb. The concentration of Diesel <br /> in MW-6 is 400 ppb. All four of{the new wells are within the Diesel plume. These same four wells, however, <br /> are well placed for contouring the extent of the BTEX plumes. <br /> Because none of the wells are non detect for Diesel PHS/EHD has determined that the lateral extent of the Diesel <br /> plume has not been completely defined. The data indicates that the plume has migrated offsite to the east. <br /> Remediation of the plume may begin at this time to prevent further migration of the plume. <br /> The report discusses the lateral extent of,soil contamination based upon soil results obtained from installing <br /> monitoring wells 1,2 and 3 and drilling borings 2,3 and 4. Contaminated soil samples were all obtained from depths <br /> ranging from 10 to 12.5 feet. The boring logs from the wells and borings that note a depth to water indicated <br /> groundwater at 10 feet. The contaminated soil exists at the capillary fringe. This indicates that hydrocarbons in <br /> the groundwater have adsorbed to the clay particles present in the capillary fringe. This type of soil contamination <br /> may be remediated with traditional groundwater remediation techniques. <br /> A Di%inion of San,Joaquin County Health Care Servicer <br />