Document 10OQyNjQRnmo5YZ9ME4Xrx3Kj

SAMPLING TRIP REPORT MONSANTO CORPORATION INDIAN ORCHARD PLANT SPRINGFIELD, MASSACHUSETTS JULY 1988 NOTICE The information in this document haa been funded by the United States Environmental Protection Agency (U.S. EPA) under REM III Contract No. 68-01-7250 to Ebaaco Services Incorporated (EBASCO). This document has been formally releas d by EBASCO to the U.S. EPA. This document does not represent, however, the U.S. EPA position or policy and has not been formally released by the U.S. EPA. RSV0023002 lJ. A complete list of the target compounds analyzed for is presented in Appendix A. The analytical results of all samples for contaminants above detection levels are presented in Table 1. -------- s. The results indicate the level of vinyl chloride (20 ug/1) in MW-58 exceed by 10 fold, the ambierffi! water quality criteria for 'the^protection of human health (2 ug/1). This is the only well in which this compound was detected. The presence of this contaminant in an area which does not contain known disposal areas indicates -a-possi-bi*> ^nur^a the presence of contaminant .jfhe concentration of benzene exceeded maximum contaminanfUevel (5 ug/1) in..eight wells while bis (2-ethyl hexyl)_ phthalate was exceeded in six wells.r The results also indicate that chlorobenzene exceeded the recommended maximum contaminant level (60 ug/1) in seven wells. Additionally, low levels of total xylenes were detected in three downgradient wells. A review of the results of samples taken in monitoring wells upstream of the SWMUs and those taken downstream of the SWMUs revealed some groundwater contamination relative to the parameters used for comparison. Chlorobenzene was detected during the August 1987 sampling trip at less than 0.1 mg/i in MW-53D but was detected during the February, 1988 trip^at JLZ mg/1. This concentration compares with concentrations in the region of 2.5 mg/1 detected in this well during past sampling events performed by the facility's consultants. 4.0 SUMMARY Upon review of the compiled analytical data, some con clusions can be drawn concerning the horizontal extent of a potential contaminant plume at the facility. It has become apparant that downgradient monitoring wells 26S, 25D, 12S and 3IS are. contaminated with some volatile and extractable organics. (The organics of most concern are benzene, chlorobenzene, bis (2-ethyl hexyl) phthalate, bis (2-chloroethyl) ether and total xylenes.^. It is also apparant that wells, 58 and 49 are contaminated to a much lesser degree than 26S, 25D, 12S and 31S. Well 4S does not show any contamination. These three observations seem to indicate a potential contaminant plume as being localized to the hydraulically downgradient edge of SWMUs in the . ^southern portion of tKe'facility, In reviewing the data, it is also apparant that both_shallow and deep groundwater degradation may have occurred. "..... . 3- - RSV0023003 -^-iCHICOPES river SCALE 'm 490 date' JULY, 1988 MONSANTO CORP. INOIAN ORCHARD PLANT GROUNDWATER MONITORING WELL LOCATIONS SOURCE* BLASLAND S BOUCX ENGINEERS, P. C., MARCH , 198 7 FIGURE hi imL7 RSV0023004 1CA Bircham Bend Brook r' PLASTICS PARK POND \ WORCESTERSTREET ::::: 510 53 V.v I fj CHICOPEE RIVER Qolu V OCD^' Li LEGEND GROUNOWATER MONITORING WELL SOLID WASTE MANAGEMENT ...... UNITS (SWMUs) DRUMS FOUND IN AERIAL PH0T0GRAGH3 -- FENCE RIVER SCALE \"si 490' date JULY, 1983 MONSANTO CORP. IN01AN ORCHARD PLANT GROUNDWATER SAMPLE LOCATIONS SOURCE* BLASLAND aBOUCK ENGINEERS, P.C., MARCH, 1987 RSV0023005 ORGANIC TRAFFIC REPORT NO. PARAMETERS VINYL CHLORIDE ACETONE CARBON DISULFIDE 2-BUTANONE BENZENE CHLOROBENZENE TOLUENE TOTAL XYLENES B1S{2-CHLOROETHYL)ETHER BlS(2-ETHYLHEryL)PHTHALATE K-KITROSODIPHINYLAMINE (1) 2,4-DIHETHYLPHENOL 2-CHLOROPHENOL 7ABLE 1 (CONTINUED) ORGANIC ANALYSES OF GROUNDWATER SAMPLES ALL UNITS IN OG/L) AK-114 1 AX-103 AX-102 | AX-104 | AX-lOB | AX-117 ) AK-118 ) AX-124 HW-53 MH-58 <3> MN-59 FB-1 FB-2 TB-1 TB-2 TB-3 3700 300 15 FB : Field Blank TB : Trip Blade Blanlc space in table indicates that tbe compound was analjrad but not detected We z' 8 RSY0023006