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P,5/17/2E99 08 52 2994683433 FIFTH FLOOR PAGE 92 <br /> PUBLIC HEALTH SERVICES ,oPa" , co <br /> SAN JOAQUIN COUNTY <br />' ENVIRONMENTAL HEALTH DIVISION - <br /> Karen Furst, M.D., M.RH, Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 9c1 WO��� <br />' 2091468-3420 <br />' STEPFLEN VALENTINE MAY 17 ZOOO <br /> NEVE & GENES SERVICE <br /> 5232 HEMET AVE <br /> STOCKTON CA 95207 <br /> ' RE STEVE &GENES SERVICES SITE CODE.2080 <br /> 2315 N EL DORADO ST <br /> STOCK TON CA 95204 <br /> ' San Joaquin County Public Health Services,Envts'onment al Hnalth Division (PITS/EI-ID) <br /> has reviewed A dddwrrl Sod ard GmwnUmr1htwz9z ton(the work plan) dazed April 11,2000 <br /> prepared by Geological'Technics,Inc (GTI) The work pLm is not approved <br /> Monitoning well 101 -101 was installed in August 1999 at the above referenced site <br /> MW-101 is screened from 92 to 97 feet below surface grade (bsg) and depth to first <br /> groundwater zs about 28 ;Feet bsg Analytical results of the quarterly groundwater samples <br /> from MW 101 were 74 pans per billion (ppb) of Benzene and 5,670 ppb of Total Petroleum <br /> Hydrocarbon as Gasoline ('TPH l) in September 1999, and 7 ppb of Benzene and 867 ppb <br /> ' of TPH g m December 1999 Analytical results of the soil sample collected at approximately <br /> 70 feet bsg during the mstallauon of MW-101 were 0 342 parts per million (ppm.) of Benzene <br /> and 44 ppm of TPH g Analytical results of the soil sample collected at 95 feet bsg from soil <br /> ' bonng 201 (SB-201) were 185 ,ppm of Benzene and 26 ppm.of'MH-G,and at 111 feet bsg <br /> were 0 33 ppm of Benzene and 4 ppm of TPI--l-g. <br /> Based on the above results,PHS/EHD corrected addmonal waorkto itivesugate the vertical <br /> extent of the contamination in both soil and ground-water in a letter dated February 16,2000 <br /> PHS/END also recommended using cone penetration technology to chat aenze the <br /> ' geology and also to better control against cross-eontammation in sampling <br /> PHS/EHD disagrees with,the work plan's proposal to advance 10 Geoprobe borings to 30 <br /> feet bsg The depth.of 3D feet bsg is insufficient in the invesugatron of the lateral extent of <br /> the contamination since data exist indicating the presence of hydrocarbon petroleum <br /> contamination in the vadose zone on site to at least 52 feet bsg Analytical zesults of the soli <br /> samples collected from bonne#5 wiiich was converted to monitoring well.# 1 (MW 1) were <br /> ' 640 ppm of IPH n at 52 feet bsg and 29 ppm of TPH-g at 56 feet bsg Groundwater was <br /> not encountered until approximately 60 feet bsg when SB-5/MW 1 was advanced and the <br /> samples were collected in September 1994 (In-enmRepmt andRm&cf Gmvzh�1mmbStZt= <br /> ' dated October 19994 prepared by Wm J. Tenter&Associates) Tbe depths of the <br /> exploration borings in an rnvesugauon of the lateral extent of the contamination should be <br /> dictated by the vertical extent of the plume,understanding of the geology and <br /> 1 <br /> ' A Divsslort of Sark Joaquin County Heaalth Care Services <br />