Page 136 - Villas at Savona Close-out Manual

Company Overview

Torrent Resources Incorporated…an Employee-Owned Company.

First licensed as a drainage contractor, Torrent Resources has evolved into a full-service; drainage
solutions partner to address ever-growing customer needs in California, Arizona, New Mexico, Nevada and
Texas. The company is headquartered in Phoenix, with an additional office in Fontana, California.

Since 1972, Torrent Resources has set the standard in design and construction of water drainage systems
for the mitigation of excess surface water. In 1974, the company revolutionized the industry with its
exclusive, patented MaxWell systems – products unmatched in efficiency and reliability by any other type
®
of stormwater disposal application. To date, more than 80,000 MaxWell drywells have been installed
throughout the western United States.

General Purpose

With a greater awareness of the need to address the quality of urban stormwater runoff, on-site drainage
systems used for the stormwater elimination have come under closer scrutiny. One such system is the
drywell which has been used previously throughout the United States to dispose of retained or surplus
surface water. The early versions of this structure were not much more than holes in the ground filled with
rocks. This meant that maintenance on these primitive types was impossible, and inundation from silt-
loading quickly led to clogging and failure of the drywells.

Fortunately, the introduction of the MaxWell concept provided a solution to this problem by incorporating a
deep settling basin to trap out the suspended solids for easy removal during routine cleaning. To that end,
all MaxWell drainage systems are designed to remove not only sediment and debris, but also floating
hydrocarbons and organic compounds prior to recharging the treated stormwater back into the sub-grade.
The water is then further polished by the soil envelope as it passes through the vadose zone to eventually
replenish the resource.

The MaxWell is a treatment BMP which also utilizes infiltration to recycle surface water for reuse. In most
cases, the system will be utilized in one of two applications: mitigation of the entire amount of retained
water from a rainfall event of some historic frequency and duration, in which case the product would be
considered volume-based; or, removal of only first flush constituents from an incremental portion of a larger
rainfall event. In the latter, the system would be considered a flow-based BMP.

The system itself is not intended to provide storage volume, but instead is designed to gradually dispose of
accumulated stormwater to ensure maximum pre-treatment efficiency. Therefore, in both applications
described above, a means of storing the required capture volume should be provided separately. This can
be done in shallow surface basins or planter areas with the drywells incorporated into the low spots, or by
interconnecting the drainage systems to underground tanks or vaults. This allows the minimum number of
drainage systems to be used to percolate the water into the sub soils, using the total allowable draw-down
timeframe. More systems could be used in lieu of storage to increase processing rates, but this is generally
not as cost-effective as providing a means or retaining the required volume.

MaxWell Plus Description
®

Preliminary treatment is provided in the dual-chambered MaxWell Plus System through the collection and
separation in deep, large volume settling chambers. Depending upon the permeability of the soils, the pilot-
hole excavations for the drywells may be up to 180 feet deep.

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