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3011 Benjamin Holt, Stockton <br /> Page 2 <br /> When responsible parties do not provide time schedules or are not proceeding with site <br /> investigations in a timely manner, PHS/EHD staff provide compliance dates. This is the <br /> case with 3011 W. Benjamin Holt Drive, Stockton. PHS/EHD set a compliance date of <br /> December 7, 2001,for submittal of a Problem Assessment Report (PAR) and has stated <br /> that if a PAR is submitted by January 14, 2002, non compliance action will not be <br /> initiated. <br /> PHS/EHD recommended moving CPT 14 north of MW 1 because there is already <br /> contamination documented in that shallow zone well and definition must be made in all <br /> water bearing zones. PHS/EHD suggested you evaluate installing additional monitoring <br /> wells during the CPT investigation because it has been documented that groundwater <br /> contamination exists at 77 feet below surface grade in the area of CPT 12. All the <br /> existing monitoring wells are screened in the shallow bearing zone, so you know you will <br /> have to install wells screened in the deeper water bearing zones, and you know the <br /> direction of groundwater flow. Therefore, you should be able to evaluate initial <br /> placement of deeper screened monitoring wells based on the information gathered prior <br /> to the December 2001 work. <br /> The decision on sampling of monitoring wells is not based on establishing trends alone, <br /> the decision is also based on confirmation that contaminant plumes are not moving. <br /> Therefore, continuing to require sampling of wells that are not detecting contaminants <br /> may be required. <br /> PHS/EHD appreciates your commitment to proceed with your site assessment and <br /> submit a PAR by January 14, 2002. <br /> Donna Heran, REHS, Director <br /> Environmental HealthDivision <br /> �r� A DiU <br /> Margaret Lagorio, Supervising REHS <br /> LOP <br /> C: RWQCB— Marty Hartzell <br /> Cambria—Joe Neely <br />