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Ms. Karen McLaughlin <br /> City of Manteca 10 September 2015 Former Police Firing Range Page 2 of 2 <br /> side berms, and deeper soil samples will be collected from three borings advanced on the range <br /> floor to assess the vertical extent of impacted soil; groundwater samples will also be collected from <br /> the borings to assess the impact on groundwater. The penetration depth of impacted soil in the <br /> berm will be assessed by trenching with a backhoe; the XRF and metal detection equipment will be <br /> utilized while trenching into the berm to assess the presence of lead shot to help determine the <br /> depth of impacts in the berm. Soil samples will be collected in stainless steel tubes sealed with <br /> Teflon tape and plastic end caps; groundwater samples will be collected in laboratory-supplied <br /> containers. Sampling equipment will be decontaminated prior to collecting each sample and the <br /> samples will be kept under, and transferred to, the analytical laboratory under chain-of-custody. In <br /> addition an equipment rinse blank and a duplicate soil sample for total lead analysis will be <br /> collected. <br /> Soil samples will be sieved utilizing #4 and #10 sieves and the two finer size fractions submitted for <br /> individual laboratory analysis. The samples will be digested following methods EPA 3010A (for <br /> groundwater) and EPA 3050B (for soil) for analysis for the CAM metals by EPA 60108, except for <br /> mercury, for which the samples will be digested following the methods EPA 7470A (water) and EPA <br /> 7471A (soil). Geocon will submit up to 45 samples for analysis for total lead by EPA Method 601 OB, <br /> five samples for analysis for the CAM 17 metals by EPA Method 6010/7471A, any samples with <br /> total metal concentrations exceeding 10 times its respective STLC for WET soluble metal by EPA <br /> Method 7420, and any soil samples with a WET soluble metal concentration exceeding its STCL <br /> and total metal concentration exceeding 20 times its respective TCLP for TCLP soluble metal by <br /> EPA Method 1311. <br /> If you have questions or comments regarding this letter, please contact Nuel Henderson at (209) <br /> 468-3436 or by email at nhenderson(cDsicehd com. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG <br /> Engineering Geologist <br /> CC: Nabaz Saieed, TY Lin Inc., 2010 Crow Canyon OI., Ste. 350, San Ramon, CA 94583 <br /> Richard Day, Geocon Consultants, Inc., 6671 Brisa St., Livermore, CA 94550-2505 <br /> Leona Winner, DTSC, 8800 Cal Center Dr., Sacramento, CA 95826 <br /> Steven Meeks, CVRWQCB, 11020 Sun Center Dr., Ste 200, Rancho Cordova, CA 95670 <br />