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.,..-.v X.P.L.a rod O-LU 0.13 VO*4 44.1.' M K'I.1EMI ---- ^toUU4 <br /> ' I <br /> i <br /> October 57 1998 <br /> Mr. H. KnolllSTCPHS <br /> PW 3 <br /> QST proposes to drill two soil borings and called soil and groundwater samples for laboratory <br /> analysis. The soope of wo&for the sdditi<mal site assessn=t is divided into four tasks described <br /> below. All work wM be peaformed under the supervision of a California R,eestmed Geologist. . <br /> Field equipment and proceduros are described in Appendix A. <br /> TASK 1. S=PEHEAR&UQN <br /> QST personnel will.mark the drilling Locations-and Underground Service Alert will determine;if <br /> the locafions are clear of subsurface utility lines and equt nest. Since both of the proposed soil <br /> borings are located in the public right-of--way, city appwval must be granted. Mmcrcachment <br /> pmi is will be obtained from the City of SWckfion and boring permits Bono.the SJCPHS. Baring <br /> locations are contingent upon the City of Stockton, the S,ICPSS approval and the location of <br /> utility lines. If boring locations are acceptable, traffic control will be used daring drilling and i <br /> sampling activities. In:additino, QST has pMared a site-spec health&salty plan fort use 4 <br /> during field activities. The health and safety plan is in Appendix B. <br /> TAM 2_ DRTT i NG AND St)II.SAMP UNG <br /> The proposed soil boring locations are shown Ton Figure 2. The location of.the borings were d <br /> selected based on previous investigations. 'The boring locations are cmdngent upon to location <br /> of utility litres. <br /> The borings will be drilled to approximately .35 feet_below ground surface, which is the <br /> appmadmately 5 feat below the depth of groundwater(bused on groundwater data collected from <br /> a nemby site). Dw*drilling, sail samples will be collected at qWmcimme 5-foot intervals for <br /> g®db*desc14m, organic vapor monitoring and chemical analysis. After drilling 5 feet bolo IVVW <br /> groundwater and collecting soil samples, a I inch PVC pipe with a 5 foot slotted section at the a <br /> bottom of the pipe will be temporarily inserted into the sail. -The groundwater:sample will be <br /> c olledrd from a Teflon or stainless steel bailer, lowered through Ow PVC pipe. Tte soil cuttin <br /> will be stoned on site in drums for later disposal by others. VIP&O 4 <br /> TASK 3_ TABORATMY ANALYSIS-. %JUG # <br /> The soil and groundwater samples will be submiWd to a statc certified analytical.Laboratory in <br /> accrndanm with local, state and federal raWkements. Based on field observadoits, select samples <br /> trill pie analyzed for Tm usieg U.S. r n ir+anrnmrtal Prosection Agency MPA).luletbod 80151 <br /> modified for volatile hydmcat ms and for B= and MTBE using BPA Method 8020. In g <br /> addition, for possible fi*=use in a health risk assessment, a wketod soil sample will be analyzed a <br /> for bulk density, total organic carbon.,porosity, hydraulic conductiAty and percent-moisture... <br /> d <br />