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� <br /> PUBLIC HEALTH SERVIC TILE S '(3 COPY <br /> �o <br /> SAN JOAQUIN COUNTY <br /> Q: <br /> ENVIRONMENTAL HEALTH DIVISION - <br /> Karen Furst, M.D., M.P.H., Health Officer iFoa;,P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> JUN 2 8 2000 <br /> RAYMOND GREER ALBERT & WANDA VELDSTRA <br /> RAYMOND GREER CONSTRUCTION 15634 STEINEGUL RD <br /> 1111 IT ST ESCALON CA 95320 <br /> ESCALON CA 95320 <br /> Re: RAYMOND GREER CONSTRUCTION Site Code: 2021 <br /> 15634 STEINEGUL RD <br /> ESCALON CA 95320 <br /> The purpose of this letter is to document the discussion at the above referenced site on June 22,2000 between <br /> the staff of San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) and your <br /> consultant WHF,Inc.(VAIF)I about modification of the work proposed in the Addarlmnto Workplan-Sal <br /> Vapor Extraction Well Desigi dated September 30, 1999 prepared by BSK&Associates(BSK). <br /> PHS/EHD approved the above-mentioned workplan addendum on October 11, 1999 on the condition that <br /> the proposed dual-completion soil vapor extraction(VE)well with screen intervals from 55 to 70 feet below <br /> surface grade (bsg) and 30 to 45 feet bsg,be changed to two separate wells in a cluster. VA-IF,Inc. <br /> recommended in the field that one of the proposed soil borings near VE-1 be converted to a well with a screen <br /> interval the same as VE-1's in order to have a monitoring point for a soil vapor extraction test. PHS/EHD <br /> agreed with the modification recommendation. <br /> The gradient of the groundwater has been typically east-southeast at the site. Due to the proximity of the <br /> groundwater contamination plume to the domestic well,and the direction of groundwater flow,PHS/EHD <br /> recommends installing an additional monitoring well in the vicinity of the domestic well. PHS/EHD also <br /> recommends eliminating the advancement of soil boring SB-105 since soil sample analytical data from the <br /> nearby MW-1,soil borings B-1 and B-2 already exist. PHS/EHD further recommends converting one of the <br /> proposed soil borings near the former tank pits to a deeper 5-foot screened monitoring well to determine the <br /> vertical extent of the contamination in groundwater as the most cost-effective approach to assessing the 3- <br /> dimensional definition of the groundwater contamination plume. <br /> If you have any questions please contact Jeffrey Wong at(209)468-0335. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> ✓ n �,r• ��amu- `��" d U <br /> Jeffrey Wong, RENS Margaret La 'o,RENS <br /> LOP/Site Maigation Unit IV Supervisor <br /> C. CRWQCB,Central Valley Region-Marty Hartzell <br /> C. WHF,Inc.-Bill Fox <br /> A Division of San Joaquin County Health Care Services <br />