Laserfiche WebLink
r y <br /> Mr. Harlin Knoll,SJCEHD June 18,2007 <br /> Well Installation Work Plan <br /> A. Teichert and Sons Property, Stockton,CA <br /> Page 8 <br /> have historically been reported for samples collected from boring CPT-8 (on-site) and <br /> boring CPT-13 (off-site) at approximately 72 feet bgs. CPT testing appears to'indicate <br /> that sandy soil situated above approximately 75 feet bgs comprise the uppermost water <br /> bearing interval in this portion of the site. Stratus is proposing to complete 3 <br /> groundwater monitoring wells across these sandy strata, in the general areas where the <br /> highest 1,2-DCA concentrations have historically been reported. <br /> A sandy interval, approximately 4 to 7 feet in thickness between approximately 88 and 98 <br /> feet bgs, appears to be laterally continuous across the site. 1,2-DCA impact was reported <br /> at borings CPT-4 (5.9 Etg/L) and boring CPT-12 (8.2 pg/L) across this stratum. Stratus is <br /> proposing to install a monitoring well across these strata, in the vicinity of boring CPT-12 <br /> l where the highest 1,2-DCA impact was noted. <br /> The proposed scope of work has been subdivided into tasks 1 through 4. Details are <br /> provided for the activities associated with each task. All geologic work will be conducted <br /> under the direct supervision of a State of California Registered Geologist or Civil <br /> Engineer and will be conducted in accordance with standards established by the <br /> California Regional Water Quality Control Board (RWQCB, .Recommendations for <br /> Preliminary Investigation and Evaluation of Underground Tank Sites, April 2004) and <br /> SJCEHD guidelines. A California-licensed C-57 well driller will perform all soil boring <br /> activities. A copy of Stratus' field practices and procedures that will be utilized during <br /> this work is provided in Appendix A. <br /> Task 1: Pre-field Activities <br /> Following approval of this Work Plan by SJCEHD personnel, the following activities <br /> will be completed: <br /> • Secure a revocable permit and an encroachment permit from the City of Stockton, <br /> • Obtain well installation permits from SJCEHD, <br /> •. Retain and schedule a licensed C-57 drilling contactor, <br /> • Update the health and safety plan for the site, <br /> Mark boring locations and contact Underground Service Alert to locate <br /> underground utilities in the vicinity of the work site, and <br /> i <br /> Notify SJCEHD,the City of Stockton, and Teichert of the scheduled field activities. <br /> KA'eichert\S tockton-103 Vork Planslteichert-well install work plan 06-2007.doc STti'14TUS <br /> I <br /> t <br />