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CASE CLOSURE SUMMARY <br />Former Santa Ana City Yard, Santa Ana <br />UST No. 083000117 <br />NA = Not Analyzed <br />ND = Not Detected <br />* Samples were collected in the vicinity of the former 650 - gallon waste oil tank. <br />Page 4 <br />** The initial soil and groundwater samples were analyzed for chlorinated hydrocarbons (HVOCs) by EPA Method 8010, <br />8240, 8260A, 8260B, 601, 624, and 625. Only the compounds that were detected in the analyses were listed. All other <br />compounds were ND. <br />+ The groundwater samples over the past few quarters were analyzed by EPA Method 8260, including the March 1999 <br />samples. <br />+ +These results indicated the levels of residual contamination remaining beneath the site. <br />** *Residual HVOC soil contamination detected in the samples but not listed individually in the table included: <br />1,2,3 - Trichlorobenzene @ 0.003 ppm (S40- 19 -19') <br />1,2,4 - Trichlorobenzene @ 0.007 ppm (S40- 19 -19') <br />1,1,1 - Trichloroethane @ 0.025 ppm (HSP- 1 -25') <br />1,2- Chloroethylvinylether @ 0.019 ppm (HSP- 2 -15') <br />2- Butanone @ 0.037 ppm (HSP- 3 -20') <br />Naphthalene @ 1.3 ppm (S40 -16') <br />1,2- Trimethylbenzene @ 0.55 ppm (540 -16') <br />Note: All off -site samples were ND for all HVOCs. <br />The March 1999 HVOC groundwater contamination not listed in the table also included: <br />1,2- Dichloroethane @ 33 ppb (B -3) <br />N- Butylbenzene @ 17 ppb (MW -1) <br />Chlorobenzene @ 8.1 ppb (B -5) <br />Isopropylbenzene @ 5.6 ppb (MW -1) <br />Naphthalene @ 27 ppb (MW -1) <br />N- Propylbenzene @ 5.4 ppb (MW -1) <br />1,2,4 - Trichlorobenzene @ 170 ppb (MW -1) <br />1,3,5 - Trimethylbenzene @ 72 ppb (MW -1) <br />1,2,4- Trimethylbenzene @170 ppb (MW -1) <br />