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^ � • DIRECTOR <br /> San Joaquin County Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> r .Z <br /> mIII� < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> r..:-=,. P Website: www.Sigov.org/ehd Margaret Lagorio, REHS <br /> Q r F O R , Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> NOV 2 6 2007 <br /> RAYMOND GREER <br /> RAYMOND GREER CONSTRUCTION ALBERT & 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 <br /> Addendum for Additional Subsurface Investigation at Former Greer Property <br /> (Addendum) dated November 1, 2007, submitted on your behalf by ATC <br /> Associates Inc. (ATC) and has the following comments. <br /> The Addendum contains proposals to continue the investigation of the vertical and <br /> lateral extent of the contamination at your site with the installation of five cone <br /> penetrometor test (CPT) borings, five shallow groundwater monitoring wells and <br /> one deep groundwater monitoring well screened from approximately 125-130 feet <br /> below surface grade (bsg). <br /> Prior to receipt of the Addendum, SJC/EHD had several telephone discussions <br /> with your consultant concerning the status of the investigation and how it should <br /> proceed. As noted in SJC/EHD correspondence dated November&'2007, the <br /> contamination encountered in monitoring well MW-6, which is currently the <br /> deepest screened (95-100 feet bsg) well on site, must be defined laterally. A <br /> minimum of three additional monitoring wells must be installed at depth to monitor <br /> this interval. <br /> SJC/EHD notes that grab groundwater samples cannot be collected during <br /> advancement of a CPT boring, but are collected from adjacent borings as water <br /> sampling equipment is not part of the CPT probe. Also, the grab groundwater <br /> samples should be collected from permeable strata identified from the CPT logs <br /> rather than at set intervals which could potentially miss important contaminant <br /> migration pathways. The high permeability interval that MW-6 is screened across <br /> would be a likely sampling target to assist lateral delineation of impacted <br /> groundwater, and to site the additional wells necessary to monitor this interval. <br />