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. .0 IV . <br /> ,IAN 14 U13 ..G <br /> ENVISONMENTAL HEALTH <br /> PEII^"N�6 ent of Toxic Substances Control <br /> Matthew Rodriquez Deborah 0. Raphael, Director Edmund G.Brown Jr. <br /> Secretary for 8800 Cal Center Drive Governor <br /> Environmental Protection Sacramento, California 95826-3200 <br /> January 11, 2013 <br /> Mr. Andrew Keller <br /> Environmental Manager <br /> The Learner Company <br /> 222 N. Poinsettia Avenue <br /> Manhattan Beach, California 90266 <br /> THIRD QUARTER 2012 GROUNDWATER MONITORING REPORT COMMENTS <br /> AND APPROVAL, THE LEARNER COMPANY (SITE CODE 101994), STOCKTON, <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> Dear Mr. Keller: <br /> The Department of Toxic Substances Control (DTSC) has reviewed the Third Quarter <br /> Groundwater Monitoring Report (3Q2012 Report) dated October 29, 2012. The 3Q2012 <br /> Reports was submitted by EARTHCON on behalf of The Learner Company. The 3Q12 Report <br /> is approved and DTSC requests that the comments below be added in to future Groundwater <br /> Monitoring Reports. <br /> COMMENTS <br /> 1. Section 5.0: Please include in this Section a discussion of the difference <br /> between arsenic concentration observed in the upgradient well and the <br /> downgradient wells. The Report should acknowledge the significant difference <br /> in the arsenic concentrations between the upgradient (MW-1) and downgradient <br /> wells (MW-2 through MW-6) and should provide an explanation in the data <br /> evaluation Section. <br /> 2. Section 6.0: Please include in this Section that the purpose of the additional <br /> monitoring wells is to provide additional data to determine the site-specific <br /> background arsenic concentrations at the Site. <br /> If you have any questions, please contact me at (916) 255-3744 or by electronic mail at <br /> jerry.lile@dtsc.ca.gov. <br /> Sincerely, ,LA <br /> Jer ile <br /> Project Manager <br /> San Joaquin and Legacy Landfills Office <br /> Brownfields and Environmental Restoration Program <br /> cc: See next page. <br /> ® Printed on Recycled Paper <br />