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FP.Uf•I Ft=ir: I1D. 1,1`_+L-',-1b-1'?~5 MPr. ~_ =~1tJ3 9_:-~Pt•I P3 <br />L Fur site investigation activities performed in Conjunction with dtz removal of a pctroleunt .tor,igc <br />System, thz ow'ntrloperator must wllect samples lium directly bc-neazh each end and the center of <br />tach tank, ur at each end only if the mole is less than 1000 callous. Sampes must also bt collected <br />iiom btnzadt tack dispenser island and Ixneadt any areas of piping which art susptttcd to have <br />released pctroletmt product hno the environment. <br />2. 'These soil samples should be colletttd and analyzed for TPH. Samples wlih TPH t;rtatcr thall <br />SUO mg/kg should [hen be analyzed for 9enzenc. Toluene, Fthylbettzene, and Xylenes (BTFX). !f <br />listzd BTEX ievzls arc exceedtd nmcdia[ion and moni[oring is requimd. <br />3. If BTEX levels are below action levels, dtrn the sample wi[h The highest TPH Itvcl shall be <br />analyzed for Polynuclear Aromatic Hydrocarbons (PAHs). <br />A. !f BTEX or PAH levels txceed rzdulatory euidelines, then site charactetiL'ttiun is required ro <br />evaluate poten[isl hazards, impact on aquifers, and extent of contatttination. "[ttis Could include <br />soil samples from additional pit-, or borings to idemify vertical and Gurituntal extent of <br />conratttittazion. Field xreerting using meters to deTect TPII 1tvclc can bt used to deteitnitte the <br />required ezttnt of sampling. <br />>. A rentedia[ion plan for [hc site is to be developed based on the site characterization. <br />Further Sampling and Anahsis <br />On December 10 additional sample }>its were excavated to btntr Cdtaraet~.rize the cxrent ofcvntantination <br />within the immediate storage aria. Results from the first sampling iu November were not yec available, but <br />three pits were excavated to depths of 5 ro 3 feet with bull: samples collected from tech. Tht first two pits <br />were located at the pruxintatt ends of the diesel storagt tanks ro follow the rewmmended UIS ptuctdure. <br />A third pit located down vradient from the storage tanks at the Cue} dispensing srarlon was coincident with <br />ont of dte 5nt sample sins, but was excavated to a depdt of eight (8) feet to better define the venica] <br />extent of contamination. The samples were submitted to Wyoming Analytical Labs for analysis fm- TPH_ <br />Lab results were received from WAL on December 2U, 2002 for d]c two Nuvcm bcr satnplts !Table I) and <br />the December San>ple; (provided by Table 2), <br />Table 2 Sample Results from December 1Q, 2002 <br />Lab Number Sample 1D LocatiuNTxpth TPft, mg/kg <br />J113ti PCS-1 Storage Tattle-West 0-2.5 fr. 211 <br />JI 182 PCS-1 S[orage'I'ank-West 2.5-5 ti. ADO <br />J 11SA PCS•? Storabt Tank-East o-5 ft. <2 <br />J1133 PCS-3 DiSpe[uing Station-Wta 0-4 Et" 3,080 <br />J1185 PCS-3 Dispensing Statiou-West A-S fr 1,200 <br />Twu of the five samples crollected on December 10, 2O(r2 exceeded dte 500 m~/l~s., target level for 1YH- <br />These two samples were analyzed for BTEX by Wyoming Analy-tiail Labs. 'The fiat;amplcs col(ected in <br />November wire not sampled for BE7X as the "sample life' had expired and iftc resu]i5 would no[ have <br />been reliable. Neidtei of the samples exceeded the limiu s.x by O1S fin BTEX (Table 3). These sarnplrs <br />werz not analyzed for PAH, a; iht °samplt life" of dte samples had beta exceeded. <br />Table 3 Sample Results for BTF.R (ug/kgl <br />Lab No Sample 1D Benzene Toluene Ethylbenzene mp-Xylene o-Xvlcne f <br />J1183 PCS-3 0, fr. 3 J 31 13 (i9 I <br />23 <br />JI 133 PCS-3 A-3 tt. _' J 44 9 11.7 I <br />33 <br />y t <br />Threshold Limit 2,600 110 200 1,900 l,!MO I <br />Peak Project Management, LLC <br />34115 County Road 20.8, Trinidad, CO 8'1082 <br />PhonelFdx (719) 846-4975 a-mail: ronthompson@sensonics.org <br />