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Zachary E. Zwahlen
1180	Limerick	Lane	!	Healdsburg	,	CA	95448		!	(707)	327-7714		!	zzwahlen@comcast.net
Career	Objective	
A	position	where	I	can	apply	my	knowledge	and	experience	in	Watershed	Management,	Hydrology,	
Forestry	and	Geographic	Information	System	toward	protecting	and	sustaining	our	natural	
resources.		
Education	
California	Polytechnic	State	University,	San	Luis	Obispo,	CA			
Graduated	June	2015	
Major:	Environmental	Management	and	Protection	
Concentration:	Watershed	Management	and	Hydrology	
Minor:	Geographic	Information	Systems	(GIS)	
	
Related	Coursework	
• Advanced	Watershed	Hydrology	
• Environmental	Impact	Reports/	CEQA	
• Surveying	with	Leica	Total	Stations	
• Stream	Measurements	and	Analysis		
• Timber	Harvest	Plans	
• Applied	ArcGIS			
• Tree	Measurements	and	Sampling	
• Soil	Erosion	and	Water	Conservation	
• Geomorphology	
• Statistics	and	Regression	Modeling	
• Environmental	Law	and	Policy	
• Conflict	Management	in	Natural	Resources	
• Forest	and	Range	Soils	
• Sustainable	Forest	and	Environmental	
Practices		
• Drainage	and	Roads	
• Data	Entry,	Validation	and	Analyses	(Excel)	
	
	
Skills	
Software:	Geographic	Information	System	(GIS)	version	10.2,		AutoCAD,	Microsoft	Office	Suite	
(Word,	Excel,	Access,	PowerPoint)	
Hardware:	Leica	and	TopCon	total	stations,	Garmin	GPS,	Leica	Geosystems	RTK	
Applications:	Spatial	databases,	ArcGIS	server,	ArcGIS	SDE,	Google	Earth	
	 	 	
Experience	
	
Hydrologist/	Surveyor	
O’Conner	Environmental,	Inc.	
Healdsburg,	CA	 	 	 	 																																October	2015	–Present;	40	hours	per	week	
	
• Surveyed	longitudinal	profiles	and	cross-sections	to	evaluate	changes	in	channel	form,	hydraulics,	
sediment	deposition,	and	suitable	salmon	habitat	in	Lagunitas	Creek	and	other	coastal	streams.	
• Collected	sediment	samples	in	potential	salmon	spawning	habitat	to	evaluate	changes	in	sediment	
composition	due	to	low	flows.	
• Surveyed	recently	constructed	root	wads	and	surrounding	channel	morphology	to	document	
current	stream	morphology	(baseline).
• Conducted	Wolman	pebble	counts	to	evaluate	stream	composition	and	compare	to	previous	
studies.	
• Validated,	summarized	and	analyzed	all	collected	data	in	excel;	imported	data	into	ArcGIS.		
	
Hydrologist/	Surveyor	
Swanton	Pacific	Ranch			
Davenport,	CA	 	 									 																																			June	2014-September	2014;	40	hours	per	week	
	
• Post-fire	monitoring	of	Scotts	and	Little	Creek;	collected	water	samples	and	in-stream	
measurements	for	analyses	of	water	quality	and	flow.	
• Lead	surveyor	in	charge	of	conducting	stream	longitudinal	profiles	and	cross-sections	with	small	
teams.			
• Installed	submerged	optic	cables	to	model	stream	temperatures	and	analyzed	for	potential	
environmental	influences.	
• Maintenance	and	monitoring	of	flumes	and	equipment	to	ensure	accurate	readings.	
• Conducted	surveys	for	suitable	habitat	for	coastal	salmon	including	macro-invertebrate	sampling,	
pool	counts,	average	depths,	temperature,	and	canopy	cover.		
• Presented	written	and	oral	presentation	on	restoration	work	and	protection	of	threatened	and	
endangered	coastal	salmonid	species.	
• Conducted	the	survey	work	for	Scotts	Creek	channel	morphology	used	to	design	the	breaching	of	
the	levees.		
	
Forester	
Swanton	Pacific	Ranch	
Davenport,	CA	 		 	 	 																				June	2014-	September	2014;	40	hours	per	week	
	
• Hands	on	training	in	technical	and	analytical	skills	involved	with	sustainable	resource	
management.	
• Sampled	tree	stands	within	the	harvest	area	to	predict	species	count	and	density.		
• Learned	the	mechanisms,	logistics	and	policies	involved	with	sustainable	resource	management.	
• Worked	with	federal	agencies,	private	landowners	and	independent	consulting	firms	to	create	a	
Timber	Harvest	Plan	for	Swanton	Pacific	Ranch.	
• Team	leader	of	ArcGIS	analyses	and	mapping	in	Timber	Harvest	Plan.	
• Conducted	forest	and	range	road	assessments	and	performed	improvements	when	needed.		
• Collected	soil	samples	and	tested	slope	stability	used	for	designing	the	skid	trails	and	landings.	
• Surveyed	for	endangered	species	with	California	Fish	and	Wildlife.	
• Determined	best	method	for	harvesting	timber	based	on	topography	of	the	Santa	Cruz	Mountains.		
					
Fisheries	Technician	
California	Department	of	Fish	and	Wildlife,		
Santa	Rosa,	CA		 	 	 																																		June	2013-	September	2013;	20	hours	per	week	
	
• Collected	stream	measurements	and	habitat	surveys	for	steelhead	and	coho	salmon.	
• Electrofishing	to	determine	species	abundance	and	habitat	fragmentation	during	low	flows.	
• Conducted	habitat	surveys	for	steelhead	and	mapped	potential	sites	for	habitat	restoration	and	
enhancement	work.		
• Evaluated	culverts	through	physical	measurements	and	determined	fish	abundance	above	and	
below	the	site	to	determine	if	passable	during	low	flows.
Zachary E. Zwahlen
1180	Limerick	Lane	!	Healdsburg	,	CA	95448		!	(707)	327-7714		!	zzwahlen@comcast.net
References	
	
Dr.	Matt	O’	Connor	
(707)	953-8681	
matto@oe-i.com	
Relationship:	Registered	Professional	Geologist	and	hydrologist.	Owner	of	O’Connor	Environmental,	
Inc.	and	direct	supervisor.		
	
Dr.	Chris	Surfleet	
(805)	756-2743	
csurflee@calpoly.edu	
Relationship:	Hydrology	professor	at	California	Polytechnic	University	San	Luis	Obispo.	Supervised	
work	on	the	Scotts	Creek	project	and	other	Swanton	Pacific	Ranch	(SPR)	hydrology	tasks.		
	
Dr.	Tom	Mastin	
(805)	756-5391	
tmastin@calpoly.edu	
Relationship:		Surveying	and	Geographic	Information	System	professor	at	California	Polytechnic	
University	San	Luis	Obispo.		Worked	together	conducting	surveys	on	Scotts	Creek	and	determined	
the	most	effective	options	for	breaching	the	levees.		
	
Mr.	Steve	Auten	
(831)	458-5413	
sauten@calpoly.edu	
Relationship:	Ranch	Operations	Manager	for	SPR.	Registered	Professional	Forester	(RPF)	who	
supervised	development	of	our	team’s	Timber	Harvest	Plan	for	SPR.		
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
Timber	Harvest	Plan	provided	on	request.

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