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SUBJECf: CPT Program at Silresim - Summary of Activities

DA1E: November 28, 1990

~onday.rioveQlber12. 1990

' COM IIIWOMIIIIIII II1QHIIIIS. soenrrsts. p/MIMII, & ll'lllllgemtnl c:onsu111n11

MEMORANDUM

10: Distribution

fROM: J. Pickens

Activities:

)....

Remarks:

The crew of Williams & Associates anived onsite at 8:00 AM and began preparations for cone testins and split spoon ~piing. EPA and COM re~ntanves onsite included: John Drake (COM). James Pickens (COM). James Curtis (COM). Bill Swanson (COM-FPC). and Richard Willey (EPA).

As part of the CPT calibration phase, the fmt sounding and soil. boring were completed next to MW-410. Continuous split spoon samples were collected using a triPOd. with motor assisted pulley. and a 140 lb. hammer. A total of sixteen (16)samples were taken to a depth of 24 feet. Following the soil boring, a standard penetrometer sounding of SO feet was performed in the same vicinity.

Both the CPT and soil boring holes were grouted immediatelyafter each activity.

The split spoon samples revealed a series of thin clay layers whictl could act as rewding medium for DNAPL. These layers.approximately 1/8" to 1/4" an thickness. were fmt seen in the 6~0 to 7.5 ft. sample. Between 7.5 and 13.5 ft. the spacingberween I yers became regular. approximately every two inches. Beyond 13.5 ft., clay layers were only occasionally found. The clays are characteristically found in silty-sand.

The cone penetration equipment~;C~equately defined changes in the oil profile. when compared With the soil boring daia and well log from MW-410, but failed to explicitly detect the thin cl . y I yen. R th r than abandon the ~gram at this point, it . d ided to continue evaluating tKe CPT re ponse

the th remaining calibration holes. Split. poon sampling,h ver, would not be done unl the ounding detected

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CAMP DRESSER & McKEE INC.

Ten Cambridge Center Cambridge, MIIIIChUIIttl 02142 817 252-8000

CAMP DRESSER & McKEE

to fifty (50) ft. was conducted next to MW-406.

CDM and EPA representatives onsite included: John Drake OM), James Pickens (COM), Jim Curtis (COM), Bill Swanson

COM-FPC), Richard Willey (EPA), and Leslie McVicker (EPA).~harles Lindberg, of GZA, was also present.

All CPT holes were grouted following the soundings.

Remarks: Asain, the CPT equipment failed to detect any soil features thmner than the sampling interval. The data did, however, show the silty-sand rayers, that contain the clay stringers, at each sounding location. Based on these results, it was decided that no standard cone penetration testing would be done in the "hot" area. except with the resistivity probe. Instead, the standard and piezo cones would be used to delineate the general stratigraphy of the site.

No additional split spoon samples were taken.

The practice of leaving PVC tubing in the CPT holes as pan of the grouting procedure, was discusSed between COM. Williams & Associates and EPA representatives. It was decided that the tubing would remain in place rather than assume the health and sifety risk associated with the removal and storage of the tubing.

) WednesdlY· Noyember 14. 1990

Activities: The resistivity phase of the program was conducted and completed. The fU'St soundms. djacent to MW-410, established a baseline re istiv1ty ~file of the soils. The three remaining holes were done in the "hot" area in order to delineate the venical and lateral di aibution of any 0 APL. Of these. two were near MW-309 and the third next to MW-405 (See Figure 1for CPT locations . AU soundinf within the "hot" area w re to ad pth of approximately fifteen 5 ft.

COM and EPA represen tiv CD •James Pickens CDM COM-FPC). Ri hard illey

All CPT hole ted foLio · n th

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CAMP DRESSER & McKEE

Thursday. November 15. 1990

Activities: Completed four soundin~s: CPT-10, CPT-11, CPT-12 and CPT-13 outside the site hot" area. The latter two holes were done with piezocones at a dissipation test interval of three meters. D1ssi!>ation tests were conducted at one meter intervals for CPT-10. Total footage was approximately 370 feet.

CDM and EPA representatives onsite included: John Drake (COM), James Pickens (CDM), Jim Curtis (COM), Bill Swanson (CDM-FPC) and Leslie McVickar (EPA).

All CPT holes were grouted following the soundings.

Remarks: During the retraction of cone rods, at CPT-10, elevated PID readinss were registered from rods that had reached approximately 60 feet in depth.

friday. November 16. 1990

Activities: Due to mechanical problems, only one piezocone sounding,CPT-14, was completed. Total footage: 108 feet.

COM representative onsite: James Pickens (COM)

The CPT hole was grouted following the sounding.

Saturday. Noyember 17. 1990

Activities: five soundings were conducted around the northern perimeterof East Pond. These were relatively shallow, with a total footage of approximately 200 feet. All soundings were done with a standard cone.

CDM representative onsite: James Pickens (COM)

All CPT holes were grouted following the soundings.

Remarks: Bedrock is not likely to be the cause of refusal during the soundings. The rig operator felt that the the cone might have encountered a boulder bed - perhaps till.

cc: Richard Willey, EPA Leslie McVickar. EPA BiU Swanson. CDM·FPC John Drake~ COM

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Data Drilled 11/12(!0 Borin9 No. SilrSB-01 Bori n9 Co. Williaaa • Aaaociataa Top of Calin9 ----­

screen Lan9th ___ Total Depth 24 ft aorin9 Method u..d -----­

riald Geol09ht ..::.J.:..·.:P.:i:,ck::;•::n::•:....._____ or9anic vapor lnatru.anta Uaad 10.2 av HNU Water Tabla Depth 4 ft

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--- 2 !1-1-t 1.!1-3 .0 ' 1.!1/0.92 0 11" r~t brown fine land with trace- lllf:.J i~k or9ani c atain•! • fl~a:ydnat i on• at approx . • nt rva 1- - Hoilt---- 3 6-lD-12 3.0-4. !1' 1.!1/1.0 0 12" fi~t br~fina aand with trace- o ca , rata1y wall aorted - - Wet-- 7.!1" Brown, fine aand with trace of- 111t and clar- • 1-6-!1 ~.!1-6.0' l. S/0. 79 0 2 Orann 1lf ned, fine land wi th r ina l and - t race 1 t vnraca of - Wet Si t

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----- , !1-71 t.D-10.5 1 1.5( 1.11 0 Y}J¥ (~tflld~ f§ir:'!~ clay -- ~r at 2 n arv 1- 'ftle nn have tM l iM farr0111

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Client _E:P:.:A;...______ Job No. ~41:.:1:.:0;....____ Surveyed l:lovation1 Ground ___

Dato Drl11od 11/12/tO 8orln9 tto. Sit.-SB-01 Borin9 co. Wlllla.. ' Aaaoclatoa Top of Cealnv ----­

lcroon ~9th ___ Total Depth 24 ft Borinv Metbod uaad ------ Pieao•tor Cealn9 Silo ' TYPe ----­

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bcov. orv;~•P· DeacrlDtion of Kateriala ru~~:·

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