READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

\* \* \* \* \* \* \* \* \* \*

[DIVISION 2: SITE CONSTRUCTION]{.underline}

SECTION 02241 - DRY WELLS

USE: Furnishing and installing dry wells.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 9/91

**SECTION 02241 **

**DRY WELLS**

**[PART 1: GENERAL]{.underline}**

**1.1 SUMMARY**

**A. Section Includes: Furnishing and installing dry wells.**

**1.2 SUBMITTALS**

**A. General: Submittals shall be according to \[Section 01009 - General
Information and Requirements\] \[Section 01330 - Submittal Procedures\]
\[and\] \[Section 01331 - Certificates\].**

**B. Manufacturer\'s Literature: Submit three copies of the
manufacturer\'s descriptive data for the rigid insulation.**

**C. Shop Drawings: Submit three copies of the shop drawings for the
grate and frame to be used on this project.**

**D. Certificates of Conformance: Submit three copies of written
certification from the supplier of the Contractor-furnished gravel
aggregates to be used on this project that they conform to the
requirements of this specification section. **

**1.3 QUALITY ASSURANCE**

**A. Failure Criteria: Not limited to the following: Units that are
warped, broken, cracked, or spalled are not acceptable.**

**1.5 PROJECT/SITE CONDITIONS**

**A. Adjacent Structures: Gravel around the dry well shall remain intact
after backfill for the adjacent structure has been placed. **

**[PART 2: PRODUCTS]{.underline}**

**2.1 MATERIALS**

**A. Gravel: \[Shall be from \[1/2\] to \[2 1/2\] inches maximum
diameter and shall be free from excessive amounts of fines, dust, sand,
or clay.\] \[The gravel used in the filter pack around the dry well
shall have a minimum cross-section 5% larger than the perforations in
the concrete sections.\] **

**B. Grate: Shall be \[\[Standard Convex\] \[Beehive Grate\]
\[\_\_\_\_\] with frame, gray iron, according to ASTM A 48, Class 35B,
of uniform quality, free from blowholes, shrinkage, distortion, and
shall be smooth and well cleaned by shotblasting.\] **

**C. Precast Perforated Concrete Sections: Shall have minimum 1 inch
diameter perforations spaced no greater than 2 ft apart in circumference
and 1 ft in height. The overall diameter of the section shall be no less
than 4 ft nor greater than 5 ft. The sections shall be designed so that
they key together at the joint and they shall conform to ASTM C 478.**

**D. Rigid Insulation: Shall be extruded polystyrene rigid foam
insulation \[of thickness according to the drawings\] \[with a minimum R
value of 5.0\] and \[ a minimum compressive strength of \[60 psi\],
complying with ASTM C 578.**

**E. Concrete: Shall be according to \[Section 03306 - Minor Concrete.\]
\[Section 03310 - Structural Concrete.\]**

**F. Geotextile Filter: Shall be synthetic polymer fibers, composed of
at lease 85% by weight of polyolephins, polyesters, or polyamides,
tensile strength of 80 lb according to ASTM D 1682, puncture strength of
25 lb according to ASTM D 751, a burst strength of 130 psi according to
ASTM D 3786, trapezoid strength of 25 lb according to ASTM D 1117, and
with apparent opening size less than 0.6 mm.**

**2.2 FABRICATION**

**A. Precast Sections: Shall be fabricated to the dimensions shown in
the drawings within casting tolerances. Concrete shall be minimum 28 day
compressive strength of 3000 psi.**

**2.3 MIXES**

**A. Concrete Mix Design: Shall be according to \[Section 03306 - Minor
Concrete.\] \[Section 03310 - Structural Concrete.\]**

**2.4 SOURCE QUALITY CONTROL**

**A. Concrete Testing: Shall be according to \[Section 03306 - Minor
Concrete.\] \[Section 03310 - Structural Concrete.\]**

**[PART 3: EXECUTION]{.underline}**

**3.1 INSTALLATION**

**A. \[Excavation:\] \[Drilling:\] Dry holes shall be \[excavated\] \[36
inches in diameter\] \[drilled\] to a depth of \[40 ft\] \[without the
use of drilling mud.\] \[Drilling\] \[Excavating\] to a depth greater
than the water table \[plus \[5\] ft will not be\] \[allowed.\]
\[required.\]**

**B. Compaction: The bottom of the hole shall be compacted to existing
densities before the footing is poured. Should non-compactable material
be encountered, the hole shall be excavated an additional two feet and
backfilled with gravel specified in Part 2 before being compacted. After
the dry well is installed, the unclassified fill material over the dry
well shall be compacted to the density of the surrounding soil.**

**C. Concrete: Shall be according to \[Section 03306 - Minor Concrete.\]
\[Section 03310 - Structural Concrete.\]**

**D. Precast Perforated Concrete Sections: Shall be installed, plumb in
the hole. Holes for drain pipe inlets shall be neatly cut or broken in
the rings so that the pipes can be grouted in place before the gravel
pack covers.**

**E. Rigid Insulation: Shall be installed as indicated on the drawing,
to completely cover the concrete top. Backfill shall be placed so as not
to disturb the foam.**

**F. Gravel: The \[drilled\] \[excavated\] hole shall be filled with the
specified gravel to a depth of \[2 inches above the bottom on the
concrete apron.\]**

**G. Precast Concrete Lid: Shall be installed to cover the rings and
support the fill and loads above.**

**H. Grate: Shall be installed as shown on the drawings.**

**3.2 FIELD QUALITY CONTROL**

**A. Inspection: The interior and exterior of the dry well will be
inspected and approved by the Contracting Officer before backfill is
placed. **

**B. Testing: The Contractor shall coordinate testing of piping systems
required under Section 15495 - Roof Drainage Piping Systems, before
placing precast concrete lid and backfill.**

**[PART 4: MEASUREMENT AND PAYMENT]{.underline}**

** 4.1 METHOD OF MEASUREMENT**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN A \"LUMP SUM\" CONTRACT IS USED, DELETE THE TITLE PART 4:
MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 -
GENERAL INFORMATION AND REQUIREMENTS OR SECTION 01010 - SUMMARY OF
WORK.**

**WHEN NOT A \"LUMP SUM\" CONTRACT, SELECT APPLICABLE PHRASES; USE THE
\"NO MEASUREMENT\" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE
INCLUDED IN THE BID SCHEDULE.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Units: The work described in this section will \[not be measured
for payment.\] \[be measured and paid for\] \[on a lump sum basis.\]
\[by the number of units constructed.\]**

**4.2 BASIS OF PAYMENT**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN NOT A \"LUMP SUM\" CONTRACT, SELECT APPLICABLE PHRASES; USE THE
\"NO DIRECT PAYMENT\" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION
ARE INCLUDED IN THE BID SCHEDULE.**

**WHEN NOT A \"LUMP SUM\" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS
SECTION, SELECT APPLICABLE PAY ITEMS. DO NOT CHANGE PAY ITEM NUMBER.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**A. Payment: \[No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract.\] \[Prices and payment
will be full compensation for the work described in this section.
Payment will be made under:\]**

**[Pay Item]{.underline}[ ]{.underline}[ ]{.underline}[ ]{.underline}[
]{.underline}[ ]{.underline}[ ]{.underline}[ ]{.underline}[
]{.underline}[ ]{.underline}[ ]{.underline}[ ]{.underline}[
]{.underline}[Pay Unit]{.underline}**

** 02241(01) Dry Well . . . . . . . . . . . . . . . . . . . . . Lump
Sum**

** 02241(02) Dry Well . . . . . . . . . . . . . . . . . . . . . Each**

**END OF SECTION**