ARCHIVED REPORTS_XR0007286 - Laserfiche WebLink

Home Browse Search

Vertical and Rorizonta ll Delineation of Plume R;st€rY Monitoring Wells MW#1,MW#2, and MW#3 were installed in September of 1999 to a depth of sixty feet Soil samples from the soil bores were extracted at five foot intervals from a depth of ten feet to sixty feet(see site map for location attached) All three soil bores produced samples above detection levels for BTEX and TPHg and TPHd(see Soil Sample Recap Attached) iViV1E1tVIlEE 'YYGllS 1V1 Wt�t'+ t111U 1V,Wff. WC1G 11I�Lt1llGU oil 11lC east Side Ui rYYllSVll Vrity 111 �C�11G11IUCl of 2000 Also,monitoring wells MW#5D,MW#6S and MW#6D,MW#7S and MW#7D were installed north and south of the pump islands in September of 2000 (see attached Site Map) Monitoring wells MW#8S and MW#813 were installed in a single bore hole inside the existing building, West of iue pump Wan&oll OLtGbier 3,20 0 4V1{11litUl lll�,'vv Glla 1V:r X70 Q.ild i ij vrr�r 7L.,vrciG Civ�iau uViGd in a single soil bore on August 14,2002 A work plan for five CPT's and three monitoring wells has been approved and a preapproval request for funding by the UST Cleanup Fund as be submitted and approved r iriaT ,['LTtw t r,R LlflfJ I�1L14Y 1 Vl�\I1�T%S yr x.141.t%lV'jrLE t%1,gr`�L i 51 i SEP"IM 1 Sampled 03/26/03 WATER ANALYSIS OF SAMPLES FROM MONITORING WELLS On March 26 &28 2003,Del-Tech Geotechnical Support Services extracted water samples from each + ....11 +....rinr.� .i..n+-....rn..+.....n.s...7.�.-41an ..nFL'..r�t1..11 T.s......n.�LJLI&g I 1L Monitoring Yr%.lL Using�'1LLill{JY4lu inul.W�1�kJl4941 it VV.911..UCL LL1%r Ju�Jt+ir' La vll vv lu[L1 —L1g'1II.V.L ILL Ra'Cpvl� i of this work by Del-Tech Geotechnical Support Services is attached and is a part of this report The water samples were transported on ice by chain of custody to Sherwood Labs for analysis by Method SW8020F for BTEX, and TPHg Samples of each set of groundwater extractions were forwarded to Entech Analytical Labs of Santa Clara, California for analysis by EPA Methods 8260FA r ilN j i ua FIM GIUA U i,,D`r�r A T�r ST i�"i+'r ns-V.. "i T i.Rirxu141k T 1011 The groundwater elevation on this site has raised about three and half feet from the last sample event and is about six feet lower than in the fourth quarter of last year The slope of the groundwater gradient for this event is down slope to the north ten degrees east at S = 0 002 The last monitoring event had a hydraulic gradient with the down slope to the northwest at S=0 005 i,'moi,Tv r nO t'ri ii10%N i i"` i�r"�'r.La, SA 14L LrL' t' Ij i a1��7 1'Vll i�T E1�1 Hl,i i r ng Samples from monitoring wells MW#4S,MW#4D,MW#5D,MW#6D,MW#7S,and MW#7D continue to be analyzed at below detection limits for TPHg Monitoring wells MW#6S, MW#8S, and MW#9D are the only monitoring wells that analyzed higher than the last event for TPHg Maximum concentrations of TPHg were found in MW#1 at 97800 ppb and MW#8S at 28100 ppb These results are about kLll p-cJ-Mcnt flip,ACI+U "I last q-t-9--c. s anialysis fol'r'Hg FINDINGS FROM MONITORING WELL SAMPLE ANALYSIS FOR OXYGENATES The presence of 1,2-DCA was detected in samples extracted from MW#1,MW#5D,MW#7D,MW#8S & 8D, and MW#9S &9D The highest concentration of 1,2-DCA was found in pmonitoring well MW#1 �r`i'uvii i„ni iVVµtVtAL it ti'av diJp4�l lir in]iCNlu i�Fr Vµ,4Llu iLi�i .�lvL r`uivii iu aairyy.i�'`r'r'`+sL of iiA v�Yl i EDBv= detected in MW#1 for this event TBA was detected in MW#6S, MW#8S, and MW#9D (See groundwater analysis recap attached) 2