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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> "'. 0 Environmental Health Department <br /> �+ ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> W rkapa Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 1141Y°�- Carl Borgman, REHS <br /> • C". =+.'gip' • ov.or /ehd Mike Huggins, REHS,RDI <br /> Website: www.s <br /> %g 9 Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> MAT FA7REHS <br /> RAYMOND GREER 11 [[�� <br /> RAYMOND GREER CONSTRUCTION ALBERT 6 WANDA VELDSTRA <br /> 2080 MC HENRY STE 100 15634 STEINEGUL ROAD <br /> ESCALON CA 95320 ESCALON CA 95320 <br /> RE: Former Greer Construction SITE CODE: 2021 <br /> 15634 Steinegul Road <br /> Escalon CA 95320 <br /> San Joaquin County Environmental Health Department(SJC/EHD) has reviewed Work <br /> Plan for Additional Subsurface Investigation (Work Plan) dated July 12, 2007, submitted <br /> on your behalf by ATC Associates Inc. (ATC) and has the following comments. <br /> The Work Plan proposes the installation of three shallow groundwater monitoring wells <br /> (MW) east of the site, and possibly three clusters of mid- and deep-level monitoring wells <br /> onsite. The directive you received from SJC/EHD in correspondence dated April 20, 2007 <br /> was to submit a work plan to define the vertical and lateral extent of contamination at this <br /> site, in both soil and groundwater. <br /> ATC states in the Work Plan that they are proposing the cluster wells with deeper screen <br /> intervals to establish if distinct hydrologic zones are present, and if so, are they impacted. <br /> Current cross-sectional diagrams have not been prepared for this site. Review of cross- <br /> sections prepared by ATC in 2003, prior to the installation of cone penetrometer test <br /> (CPT) borings in 2004, indicates that wells MW-2, MW-3 and MW-4, located on the west <br /> side of the site are screened across silt, while the wells on the south of the site, including <br /> MW-6, have screen intervals which intercept sand below the silt. This lithological <br /> variation, if accurate, may have some bearing on why the groundwater elevation is always <br /> higher on the west side of the site than on the south and eastern sides of the site. <br /> SJC/EHD recommends additional CPT assessment work to provide a more complete <br /> description of the subsurface lithology prior to installing more monitoring wells. No CPT <br /> borings have been advanced on the western side of the site; this area should be <br /> investigated and grab groundwater samples collected at appropriate intervals, both <br /> shallow and deep, to define the plume laterally at different depths. Borings should be <br /> placed to define the plume to the north and west of MW-3 and MW-4, and to collect <br /> shallow groundwater samples east and southeast of MW-5. If ATC agrees with this <br /> modification to the proposed work plan, please submit a brief addendum with a map <br /> indicating suitable CPT boring locations. <br />