Table A-1 (continued)

Approximate Percent
Applicable                            [                                1I   Reduction of               Assumptions for
Land Use        Control Measuresa           Summary Description        Released Pollutantab          Costing Purposes

Increased leaf and
clippings collection
and disposal

Increase the frequency and
efficiency of leaf collection
procedures in fall; use
vacuum cleaners to collect
leaves; implement ordinances
for leaves, clippings, and
other organic debris to be
mulched, composted, or bagged
for pickup

2-5

Assume one equivalent mature
tree per residence plus five
trees per acre in
recreational areas; 75
pounds of leaves per tree;
20 percent of leaves in
urban areas not currently
disposed of-properly. The
cost of the collection of
leaves in a vacuum sweeper
and disposal is estimated at
$180-$200 per ton of leaves

Increased catch basin     Increase frequency and                   2-5           Determine curb miles for
cleaning                  efficiency of catch basin                               street sweeping; vary
cleaning; clean at least                                percent of urban area served
twice per year using vacuum                             by catch basins by watershed
cleaners; catch basin                                   from Commission inventory
installation in new urban                               data; assume density of 10
development not recommended                             catch basins per curb mile;
as a cost-effective practice                            clean each basin twice
for water quality improvement                           annually by vacuum cleaner.
The cost of cleaning a catch
basin is approximately $10.
Reduced use of deicing    Reduce use of deicing salt on    Negligible for        Increased costs, such as for
salt                      streets; salt only               pollutants            slower transportation
intersections and problem        addressed in this     movement, are expected to be
areas; prevent excessive use     plan but helpful       offset by benefits such as
of sand and other abrasives      for reducing           reduced automobile corrosion
chlorides and          and damage to vegetation
associated damage
to vegetation
Improved street           Increase street maintenance              2-5           Increase current expenditures
maintenance and refuse    and repairs; increase                                  by approximately 15 percent
collection and            provision of trash
disposal                  receptacles in public areas;
improve trash collection
schedule; increase cleanup of
parks and commercial centers
Parking lot stormwater    Construct gravel-filled                  5-10          Design gravel-filled trenches
temporary storage and     trenches, sediment basins, or                           for 24-hour, five year
treatment measures        similar measures to store                              recurrence interval storm;
tenporarily the runoff from                             apply to off-street parking
parking lots, rooftops, and                             acreages. For treatment--
other large impervious areas;                           assume four-hour detention
if treatment is necessary,                              time. The capital cost of
use a physical-chemical                                 stormater detention and
treatment measure such as                               treatment facilities is
screens, dissolved air                                  estimated at $40,000-$80,000
flotation, or a swirl                                   per acre of parking lot
concentrator                                            area, with an annual
operation and maintenance
cost of about $200 per acre

Onsite storage--
residential

Remove connections to sewer
systems; construction onsite
stormwater storage measures
for subdivisions

5-10

Remove roof drains and other
connections from sewer
system wherever needed; use
lawn aeration if applicable;
apply dutch drain storage
facilities to 15 percent of
residences. The capital cost
would approximate $500 per
house, with an annual
maintenance cost of about
$25

A-3

Urban
(continued)